CA1151001A - Heat-sensitive transfer element - Google Patents
Heat-sensitive transfer elementInfo
- Publication number
- CA1151001A CA1151001A CA000363875A CA363875A CA1151001A CA 1151001 A CA1151001 A CA 1151001A CA 000363875 A CA000363875 A CA 000363875A CA 363875 A CA363875 A CA 363875A CA 1151001 A CA1151001 A CA 1151001A
- Authority
- CA
- Canada
- Prior art keywords
- hot
- heat
- ink layer
- transfer element
- melt ink
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000012943 hotmelt Substances 0.000 claims abstract description 32
- 239000007787 solid Substances 0.000 claims abstract description 14
- 239000004020 conductor Substances 0.000 claims abstract description 10
- 239000000843 powder Substances 0.000 claims abstract description 5
- 239000010410 layer Substances 0.000 claims description 57
- 239000000463 material Substances 0.000 claims description 17
- 239000002253 acid Substances 0.000 claims description 8
- 239000011230 binding agent Substances 0.000 claims description 8
- 239000011248 coating agent Substances 0.000 claims description 8
- 238000000576 coating method Methods 0.000 claims description 8
- 238000004040 coloring Methods 0.000 claims description 6
- 239000002243 precursor Substances 0.000 claims description 6
- 230000035515 penetration Effects 0.000 claims description 5
- 239000011247 coating layer Substances 0.000 claims description 2
- 238000007639 printing Methods 0.000 description 17
- 239000000123 paper Substances 0.000 description 16
- 239000000975 dye Substances 0.000 description 7
- 238000002844 melting Methods 0.000 description 7
- 239000001993 wax Substances 0.000 description 7
- 230000008018 melting Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 150000007522 mineralic acids Chemical class 0.000 description 4
- 150000007524 organic acids Chemical class 0.000 description 4
- 239000000049 pigment Substances 0.000 description 4
- 238000007651 thermal printing Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 241000206607 Porphyra umbilicalis Species 0.000 description 3
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- WPYMKLBDIGXBTP-UHFFFAOYSA-N benzoic acid Chemical compound OC(=O)C1=CC=CC=C1 WPYMKLBDIGXBTP-UHFFFAOYSA-N 0.000 description 2
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 description 2
- LNTHITQWFMADLM-UHFFFAOYSA-N gallic acid Chemical compound OC(=O)C1=CC(O)=C(O)C(O)=C1 LNTHITQWFMADLM-UHFFFAOYSA-N 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- YGSDEFSMJLZEOE-UHFFFAOYSA-N salicylic acid Chemical compound OC(=O)C1=CC=CC=C1O YGSDEFSMJLZEOE-UHFFFAOYSA-N 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- FWLHAQYOFMQTHQ-UHFFFAOYSA-N 2-N-[8-[[8-(4-aminoanilino)-10-phenylphenazin-10-ium-2-yl]amino]-10-phenylphenazin-10-ium-2-yl]-8-N,10-diphenylphenazin-10-ium-2,8-diamine hydroxy-oxido-dioxochromium Chemical compound O[Cr]([O-])(=O)=O.O[Cr]([O-])(=O)=O.O[Cr]([O-])(=O)=O.Nc1ccc(Nc2ccc3nc4ccc(Nc5ccc6nc7ccc(Nc8ccc9nc%10ccc(Nc%11ccccc%11)cc%10[n+](-c%10ccccc%10)c9c8)cc7[n+](-c7ccccc7)c6c5)cc4[n+](-c4ccccc4)c3c2)cc1 FWLHAQYOFMQTHQ-UHFFFAOYSA-N 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- 239000005711 Benzoic acid Substances 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 description 1
- 241000257303 Hymenoptera Species 0.000 description 1
- 241000282320 Panthera leo Species 0.000 description 1
- AZUZXOSWBOBCJY-UHFFFAOYSA-N Polyethylene, oxidized Polymers OC(=O)CCC(=O)C(C)C(O)CCCCC=O AZUZXOSWBOBCJY-UHFFFAOYSA-N 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 235000021355 Stearic acid Nutrition 0.000 description 1
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 description 1
- 206010057040 Temperature intolerance Diseases 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 239000006230 acetylene black Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 235000010233 benzoic acid Nutrition 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 229920003086 cellulose ether Polymers 0.000 description 1
- 239000012185 ceresin wax Substances 0.000 description 1
- 235000015165 citric acid Nutrition 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 229940074391 gallic acid Drugs 0.000 description 1
- 235000004515 gallic acid Nutrition 0.000 description 1
- 239000011086 glassine Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 230000008543 heat sensitivity Effects 0.000 description 1
- 238000007757 hot melt coating Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000012182 japan wax Substances 0.000 description 1
- 239000003273 ketjen black Substances 0.000 description 1
- 239000006233 lamp black Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
- FJKROLUGYXJWQN-UHFFFAOYSA-N papa-hydroxy-benzoic acid Natural products OC(=O)C1=CC=C(O)C=C1 FJKROLUGYXJWQN-UHFFFAOYSA-N 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 150000002990 phenothiazines Chemical class 0.000 description 1
- 229920000767 polyaniline Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 229920002689 polyvinyl acetate Polymers 0.000 description 1
- 239000011118 polyvinyl acetate Substances 0.000 description 1
- 239000012260 resinous material Substances 0.000 description 1
- 229960004889 salicylic acid Drugs 0.000 description 1
- 229940084106 spermaceti Drugs 0.000 description 1
- 239000012177 spermaceti Substances 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000011975 tartaric acid Substances 0.000 description 1
- 235000002906 tartaric acid Nutrition 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 239000011135 tin Substances 0.000 description 1
- 150000004961 triphenylmethanes Chemical class 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
- B41M5/40—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used characterised by the base backcoat, intermediate, or covering layers, e.g. for thermal transfer dye-donor or dye-receiver sheets; Heat, radiation filtering or absorbing means or layers; combined with other image registration layers or compositions; Special originals for reproduction by thermography
- B41M5/48—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used characterised by the base backcoat, intermediate, or covering layers, e.g. for thermal transfer dye-donor or dye-receiver sheets; Heat, radiation filtering or absorbing means or layers; combined with other image registration layers or compositions; Special originals for reproduction by thermography combined with other image registration layers or compositions; Special originals for reproduction by thermography
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
- B41M5/30—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using chemical colour formers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
- B41M5/382—Contact thermal transfer or sublimation processes
- B41M5/38207—Contact thermal transfer or sublimation processes characterised by aspects not provided for in groups B41M5/385 - B41M5/395
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S428/00—Stock material or miscellaneous articles
- Y10S428/913—Material designed to be responsive to temperature, light, moisture
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24942—Structurally defined web or sheet [e.g., overall dimension, etc.] including components having same physical characteristic in differing degree
- Y10T428/2495—Thickness [relative or absolute]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24942—Structurally defined web or sheet [e.g., overall dimension, etc.] including components having same physical characteristic in differing degree
- Y10T428/24992—Density or compression of components
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
- Y10T428/266—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension of base or substrate
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/27—Web or sheet containing structurally defined element or component, the element or component having a specified weight per unit area [e.g., gms/sq cm, lbs/sq ft, etc.]
- Y10T428/273—Web or sheet containing structurally defined element or component, the element or component having a specified weight per unit area [e.g., gms/sq cm, lbs/sq ft, etc.] of coating
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/27—Web or sheet containing structurally defined element or component, the element or component having a specified weight per unit area [e.g., gms/sq cm, lbs/sq ft, etc.]
- Y10T428/273—Web or sheet containing structurally defined element or component, the element or component having a specified weight per unit area [e.g., gms/sq cm, lbs/sq ft, etc.] of coating
- Y10T428/277—Cellulosic substrate
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31801—Of wax or waxy material
Abstract
ABSTRACT OF THE DISCLOSURE
A heat-sensitive transfer element comprising foundation, a thermal color-developing layer provided on the front surface of the foundation and a hot-melt ink layer provided on the back surface of the foundation;
the ink layer including a heat conductive material powder and a solid wax, and having a melt-transfer property a printed image to be formed on the thermal color-developing layer by the impression of a thermal head, and simultaneously the hot-melt ink being transferred to a copy sheet facing the transfer element at the hot-melt ink layer side, the duplicated image having good clarity and excellent durability being able to be prepared at a high speed on a thermal printer.
A heat-sensitive transfer element comprising foundation, a thermal color-developing layer provided on the front surface of the foundation and a hot-melt ink layer provided on the back surface of the foundation;
the ink layer including a heat conductive material powder and a solid wax, and having a melt-transfer property a printed image to be formed on the thermal color-developing layer by the impression of a thermal head, and simultaneously the hot-melt ink being transferred to a copy sheet facing the transfer element at the hot-melt ink layer side, the duplicated image having good clarity and excellent durability being able to be prepared at a high speed on a thermal printer.
Description
~is,~
BACKGROU~'D OF ~E INVENTION
The present invention relates to a novel heat-sensitive transfer element being preferably employed to a thermal printing device such as a thermal printer or the like.
Recently, as a printing method using the thermal printing device, the method which comprises overlapping two sheets of thermal paper and forming printed images of the same pattern to each color-developing surface of both thermal papers by Joule~S
heat generated from a thermal printing head has been proposed.
Such a printing method has various drawbacks as mentioned below.
Firstly, according to the above method, it is impossible to print onto a conventional paper.
Secondly, since the large amount of Joule's heat is required to develop color by heating, a pulse must be conventionally impressed at the pulse width more than 15/1000 seconds in order to obtain a sharp and clear printed image, whereby the printed speed must be carried out at a rate of about 3~ characters per second.
Thirdly, the printed image formed onto each color-developing surface of the upper and lower thermal papers is inferior in durability, and is easily alterable.
Fourthly, in order to duplicate the sharp and clear printed image on the lower thermal paper, two sheets of the thermal paper must be closely contacted to each other.
OBJECTS OF THE INVENTION
The main object of the present invention is to provide a novel heat-sensitive transfer element which can duplicate onto a conventional paper at a high printed speed.
Another object of the present invention is to provide a novel heat-sensitive transfer element in ...
s~o~
which the duplicated ima~e formed on a conventional paper is su~erior in durability and has resistance against alteration of the duplicated image.
Other objects and advantages of the invention will become more a~parent ~rom the following descriptions and drawings.
BRIEF DESCRIPTIO'~ OF ~E DRAWI.~GS
Fig. 1 is a perspective enlarged sectional view partially showing an embodi'ment of a heat-sensitive transfer element of the present invention.
Figs. 2 to 3 are perspective explanatory views showing a relationship between the heat-sensitive transfer element of the present invention and a co~y sheet during and after printing, respectively.
DETAILED EXPLANATION OF ~E INVENTIO~
It has now been found that the above-mentioned objects can be attained by a novel heat-sensitive transfer element.
As shown in Fig. 1, the heat-sensitive transfer element of the present invention comprises a foundation 1 in which the back surface has a Bekk smoothness of 60 to 20000 seconds, a thermal color-developing l~yer 2 provided on the front surface of the foundation 1, and a hot-melt ink layer 3 having the heat-sensitive transfer property, provided on the back surface of the foundation 1. The hot-melt ink layer ~ essentially includes a heat-conductive material powder such as black color pigment, metal powder pigment or the like, which has a heat conductivity of 6.0 ~ 10 4 to 25.0 x 10 4 cal.~sec. cm. C., and a solid wa~ having a penetration of 10 to 30 at 25C., and has a viscosity of 20 to ~00 cP at 100C. by a Brookfield type viscometer.
The foundation 1 employed, according to the present invention, has at the back surface thereof a Bekk smoothness (JIS P ~119~ of 60 to 20000 seconds, more preferably 200 to 16000 seconds. Such a foundation ~lSll)Oi 1 is a ~aper, such as glassine ~aper, tissue paper, electrical insulating pa~er, parchment pa~er, India paper, raw stock for paraffin paper or the like, having a thickness of ~0 to 60 ~, more preferably 30 to 5~
and a densitv of ~. 5 to 1.3 g./cm3, more prefeTably 0.8 to 1.2 g./cm~
l~hen the Bekk smoothness of the back surface of foundation 1 is less than the above range, its smoothness is inferior and the roughness reduces its adhesiveness hith the hot melt ink layer 3, whereby the heat conductivity of foundation 1 for melting the above ink laver 3 becomes inferior, and results in irregular melt-transfer of the ink layer 3 to the copy sheet 5. On the other hand, when the Bekk smoothness of the back surface of foundation 1 is more than the above range, although the melt-transferability of the ink layer 3 is increased, it causes easy release of ink layer 3 during the printing or on storage, and can hamper obtaining the uniform duplicated image 12. In such cases, in order to prevent the release of the ink layer 3, various resinous materials as a softener having adhesiveness are added to the ink layer 3.
Further, when the thickness of the foundation 1 is less than the above range, the hot-melt ink penetrates through foundation 1 to the surface, thereby reducing the whiteness of the surface as well as the thermal head 7 being smudged by the exuded hot melt ink. On the other hand, when the thickness of the foundation 1 is more than the above range, a duplicated image 12 obtained is inferior in resolution due to the spread of the heat, and results in the absence of a sharp profile. In addition, when the density of the foundation 1 is less than the above range, the foundation 1 is inferior in heat conductivity due to the roughness of the surface thereof. On the other hand, when the density of the foundation 1 is more than the above range, the surface is tightly packed and has increased heat capacity that large electric power is necessary to melt and transfer the I
~Sl )O~
. ~ ~
hot-melt ink laver 3.
The hot-melt ink layer 3 has a coating weight of 1 to lS g~/cm2, more preferably 3 to 10 g./cm2, and is prepared b~ means of the hot-melt coating of a composition which comprises the heat-conductive material, a coloring material, a binder material and the softener, or bv means of the solvent coating of a li~uid obtained by suspending the above composition in a suitable solvent.
l~hen the coating weight of the hot-melt layer 3 is less than the above range, the amount of ink transferred by one impression is so little that a faint duplicated image 12 is obtained. On the other hand, when the coating weight of the hot-melt layer 3 is more than the above range, it causes the duplicated image 12 to spread,and reduces sharpness.
In addition, the hot-melt ink layer 3 has a heat conductivity of 4 x 10 4 to 15 ~ 10 4 cal./cm. sec~oc ~ more preferably 5 x 10 4 to 9 x 10 4 cal./cm. sec. C. l~hen the heat conductivity of the ink layer 3 is less than the above range, due to the momentary heating in one impression, a large amount of heat energy is required for securing the melt-transfer of the hot-melt ink layer 3. On the other hand, when the heat conductivity of the ink layer 3 is more than the above range, although the use is not limited, the production is difficult, and is not practical.
Thus, the preferred heat conductive material employed, according to the present invention, is the black color pigment such as acetylene black, lamp black, graphite, aniline black, KETJEN black (registered trademark of LION AKZO CO~IPANY LI~IITED~ or the like, or the metal powder such as aluminum, copper, tin, zinc or the like, and has a heat conductivity of 6.0 ~ 10 4 cal/sec. cm. C. Such a heat conductive material functions to accelerate the melting, softening and sublimating properties of the hot melt ink layer 3 which is applied to the back surface of the foundation 1, and ~S~OOl can shorten the time required for melting? softening and sublimating the ink. The heat conductive material is preferably used in amounts ranging from 2 to 30 parts by weight per lOq parts by .eight of the total amount of the ink. Thus, the hot-melt in~ layer 3 including the heat conductive material within the above range is superior in melt-transfer property, and thereby can easily produce the duplicated image 12 merely by contacting lightlv ~ith the copy sheet S, in addition to producing the most clear duplicated image 12.
The solid wax having a penetration of lO to 30 at 25C., is used as the binder material to increase the heat-sensitivity of the ink layer obtained. The solid wax is employed from waxes such as Japan wax, ceresin wax, bees~iax, spermaceti or the like. Further, if necessary, other hot-melting materials such as low-molecular polyethylene, oxidized wax and ester wax may be used, together with the above waxes.
Also, as a softener, easily heat-melted material such as polyvinyl acetate, polystyrene, styrene-butadiene copolymer, cellulose ester, cellulose ether, acrylic resin, or lubricating oil is suitably used. Further, as a coloring material, conventional standard dyes or pigments used in conventional copy papers can be used without special restriction.
Preferably, 5 to ~5 parts by weight of the binder material, 5 to 35 parts by weight of the softener and 5 to 25 parts by weight of the coloring material are used per 100 parts by weight of the total amount of the hot-melt ink layer 3. Thus, the ink layer 3 obtained is significantly excellent in melt-transfer property.
While the hot-melt ink layer 3 itself, according to the present invention, is softened by heating and then is melted, the ink layer 3 has the dra~back that the duplicated image 12 obtained causes spreading of the ink in the perfectly melted condition. Thus, it is desirable that, when the ink layer 3 starts to soften, the ink $1~0~
layer 3 is transferred, and further has adhesiveness at that stage.
According to the present invention, the above hot-melt ink layer ; is prepared so as to have a viscosity of 20 to 200 cP at 100C., as measured on a Brookfield type viscometer. Thus, it has now been found that, when the viscosity of the ink layer 3 is less than 20 cP, the duplicated image 12 obtained causes spread of the ink, and on the contrary, when the viscosity is more than 200 cP, transferability of the ink layer 3 becomes poor.
The viscosity of the ink layer 3 at the time of the melt-transfer significantly affects the transferability of the ink layer 3. Therefore, the range of the viscosity of the ink layer 3 in the melt-transfer should be prescribed.
~ s a result of various investigations, it has now been found that the ink layer 3 having a vicosity within the above range at 100C. is softened without completely melting bv the heat generated from the thermal head 7, and has an excellent viscosity under a soften condition, whereby the ink layer 3 has a significantly excellent melt-transfer property.
Also, the thermal color-developing layer 2 has a thickness less than 10 ~, and is ~repared by dispersing both a dye precursor capable of developing the color by reacting with acid and an organic or inorganic acid being a solid or semi-solid under room temperature in a suitable binder material, and then applying the obtained homogeneous suspension onto the foundation 1 as a coating layer. In the thermal color-developing layer 2, the suspended acid which is a solid or semi-solid is melt-liquefied by Joule's heat geneTated from the thermal head 7, and as a result, is reacted with a dye precurs~r to form the clear printed image 11.
As a dye precursor, various dye precursors such as phenothiazines, fluorans, leucoauramines, triphenylmethanes, spiropyrans or the like are prefera~l s~
employed. Also, as an organic or inorganic acid, benzoic acid, tartaric acid, citric acid, salicylic acid, stearic acid, gallic acid, Bisphenol A, na~htoic acid, pvrophosphoric acid, meta~hosphoric acid or the like is preferably employed.
Further, the heat-sensitive transfer element of the present invention may be prepared from a li commercially-available thermal paper, and in that case, the hot-melt ink layer 3 is coated on the reverse side of the color-developing surface in the thermal paper.
~ lso, the transfer element of the present invention may be prepared from the foundation 1 in which a coating li~uid comprising waxes or synthetic resins for¦ I
preventing the penetration of the ink layer 3 is ~ ¦
penetrated in advance, or if necessary, may be prepared by interposing a layer obtained from the above liquid for preventing the penetration between the foundation 1 and the color-developing layer 2.
The function and advantages of the heat-sensitive transfer element of the invention in case of printing by the thermal printer will be described below.
Fig. 2 shows the relationship between the heat-sensitive transfer element of the invention and the copy sheet in the course of printing. In Fig. 2, indicated as ~ is the heat-sensitive transfer element of the invention, comprising the foundation 1, the thermal color-developing surface 2 and the hot-melting ink layer 3, 5 is the copy sheet, 6 is the platen, 7 is the thermal head in which the exothermic resistance element is arranged in the form of the dot matrix such as 1 x 7, 5 x 7, 7 x 9 or the like, due to the printing pattern, 8 and 9 are terminals for impressing the pulse, and 10 is the printed image which is just forming.
The heat-sensitive transfer element 4 is attached to the thermal printer so that the hot melt ink layer 3 side is in contact with the copy sheet 5. The color-developing laver ~ is in contact with the thermal head 7, while the co~y sheet 5 is in contact with the platen 6~ As a copy sheet i, a conventional paper is em~loved~ When the pulse corresponding to the printing pattern is iml~ressed from the terminals ~ and 9, the thermal head 7 generates Joule's heat from the dots corresponding to the printing pattern. The Joule's heat generated is transmitted to the thermal color-developing layer 2, and melts the organic or inorganic acid, which is solid or semi-solid, and which is dispersed in the thermal color-developing layer 2, to ma~e the melted acid react with the dye precursor, whereby the printed image 10 corresponding to the printing pattern is formed. Furthermore, Joule's heat is instantaneously transmitted through the foundation 1 to the hot-melt ink layer 3, and partially melts the ink layer 3 corresponding to the printing pattern.
Fig. 3 shows a condition after impressing the pulse, and numerals of 1 to 9 indicate the same materials as the numerals of 1 to 9 in Fig. 2. 11 is a printed image formed perfectly, and 12 is a duplicated image.
After impressing the pulse, the thermal head 7, the heat-sensitive transfer element 4 and the copy sheet S are separated, and a part of the hot-melt in~
layer 3 melted in compliance with the printing pattern is released from the foundation 1, and transferred to the copy sheet 5, whereby the duplicated image 12 corresponding to the printing pattern is formed.
On the other hand, in the thermal color-developing layer 2, the color-development reaction between the dye precursor and the organic or inorganic acid has already been accomplished, and as a result, the clear printed image 11 has been formed.
Thus, the pulse impression is repeated, and the printing procedures are successively carried out.
Further, Figs. 2 to 3 show the embodiment of the case that the heat-sensitive transfer element ~ is placed on the copy sheet S to produce the duplicated ~1510~
image 1'. i`o the contrary, if the co~y sheet 5 has excellent heat conductivity, it is possible that the cop) sheet 5 is ~laced on the heat-sensitive transfer element, and is contacted with the thermal head 7 at the bac~ surfacc thereof.
The printed image 11 thus obtained has a sharp rrofile, and can be read hith ease.
~ lso, with respect to tne duplicated i~age 11, since the melt-transfer property of the hot-melt ink layer ~ is increased by the function of the heat-conductive material, and has a coating weight of 1 to lS
g /cm.2 allo-.ing an excellent melt-transfer property as mentioned above, the duplicated image 11 is formed on the copy sheet 5 l~ith ease, and since the amount of the transferring ink is suitable, the clear duplicated image 1' obtained by transferring the solid hot-melt ink is highly durable and difficult to alter. Accordingly, such a duplicated image 12 is particularly effective in case requiring storage over a long period of time.
Furthermore, according to the present invention, since the back surface of the foundation 1 has excellent smoothness and heat conductivit~;, and further the organic or inor~anic acid in the color-developing layer
BACKGROU~'D OF ~E INVENTION
The present invention relates to a novel heat-sensitive transfer element being preferably employed to a thermal printing device such as a thermal printer or the like.
Recently, as a printing method using the thermal printing device, the method which comprises overlapping two sheets of thermal paper and forming printed images of the same pattern to each color-developing surface of both thermal papers by Joule~S
heat generated from a thermal printing head has been proposed.
Such a printing method has various drawbacks as mentioned below.
Firstly, according to the above method, it is impossible to print onto a conventional paper.
Secondly, since the large amount of Joule's heat is required to develop color by heating, a pulse must be conventionally impressed at the pulse width more than 15/1000 seconds in order to obtain a sharp and clear printed image, whereby the printed speed must be carried out at a rate of about 3~ characters per second.
Thirdly, the printed image formed onto each color-developing surface of the upper and lower thermal papers is inferior in durability, and is easily alterable.
Fourthly, in order to duplicate the sharp and clear printed image on the lower thermal paper, two sheets of the thermal paper must be closely contacted to each other.
OBJECTS OF THE INVENTION
The main object of the present invention is to provide a novel heat-sensitive transfer element which can duplicate onto a conventional paper at a high printed speed.
Another object of the present invention is to provide a novel heat-sensitive transfer element in ...
s~o~
which the duplicated ima~e formed on a conventional paper is su~erior in durability and has resistance against alteration of the duplicated image.
Other objects and advantages of the invention will become more a~parent ~rom the following descriptions and drawings.
BRIEF DESCRIPTIO'~ OF ~E DRAWI.~GS
Fig. 1 is a perspective enlarged sectional view partially showing an embodi'ment of a heat-sensitive transfer element of the present invention.
Figs. 2 to 3 are perspective explanatory views showing a relationship between the heat-sensitive transfer element of the present invention and a co~y sheet during and after printing, respectively.
DETAILED EXPLANATION OF ~E INVENTIO~
It has now been found that the above-mentioned objects can be attained by a novel heat-sensitive transfer element.
As shown in Fig. 1, the heat-sensitive transfer element of the present invention comprises a foundation 1 in which the back surface has a Bekk smoothness of 60 to 20000 seconds, a thermal color-developing l~yer 2 provided on the front surface of the foundation 1, and a hot-melt ink layer 3 having the heat-sensitive transfer property, provided on the back surface of the foundation 1. The hot-melt ink layer ~ essentially includes a heat-conductive material powder such as black color pigment, metal powder pigment or the like, which has a heat conductivity of 6.0 ~ 10 4 to 25.0 x 10 4 cal.~sec. cm. C., and a solid wa~ having a penetration of 10 to 30 at 25C., and has a viscosity of 20 to ~00 cP at 100C. by a Brookfield type viscometer.
The foundation 1 employed, according to the present invention, has at the back surface thereof a Bekk smoothness (JIS P ~119~ of 60 to 20000 seconds, more preferably 200 to 16000 seconds. Such a foundation ~lSll)Oi 1 is a ~aper, such as glassine ~aper, tissue paper, electrical insulating pa~er, parchment pa~er, India paper, raw stock for paraffin paper or the like, having a thickness of ~0 to 60 ~, more preferably 30 to 5~
and a densitv of ~. 5 to 1.3 g./cm3, more prefeTably 0.8 to 1.2 g./cm~
l~hen the Bekk smoothness of the back surface of foundation 1 is less than the above range, its smoothness is inferior and the roughness reduces its adhesiveness hith the hot melt ink layer 3, whereby the heat conductivity of foundation 1 for melting the above ink laver 3 becomes inferior, and results in irregular melt-transfer of the ink layer 3 to the copy sheet 5. On the other hand, when the Bekk smoothness of the back surface of foundation 1 is more than the above range, although the melt-transferability of the ink layer 3 is increased, it causes easy release of ink layer 3 during the printing or on storage, and can hamper obtaining the uniform duplicated image 12. In such cases, in order to prevent the release of the ink layer 3, various resinous materials as a softener having adhesiveness are added to the ink layer 3.
Further, when the thickness of the foundation 1 is less than the above range, the hot-melt ink penetrates through foundation 1 to the surface, thereby reducing the whiteness of the surface as well as the thermal head 7 being smudged by the exuded hot melt ink. On the other hand, when the thickness of the foundation 1 is more than the above range, a duplicated image 12 obtained is inferior in resolution due to the spread of the heat, and results in the absence of a sharp profile. In addition, when the density of the foundation 1 is less than the above range, the foundation 1 is inferior in heat conductivity due to the roughness of the surface thereof. On the other hand, when the density of the foundation 1 is more than the above range, the surface is tightly packed and has increased heat capacity that large electric power is necessary to melt and transfer the I
~Sl )O~
. ~ ~
hot-melt ink laver 3.
The hot-melt ink layer 3 has a coating weight of 1 to lS g~/cm2, more preferably 3 to 10 g./cm2, and is prepared b~ means of the hot-melt coating of a composition which comprises the heat-conductive material, a coloring material, a binder material and the softener, or bv means of the solvent coating of a li~uid obtained by suspending the above composition in a suitable solvent.
l~hen the coating weight of the hot-melt layer 3 is less than the above range, the amount of ink transferred by one impression is so little that a faint duplicated image 12 is obtained. On the other hand, when the coating weight of the hot-melt layer 3 is more than the above range, it causes the duplicated image 12 to spread,and reduces sharpness.
In addition, the hot-melt ink layer 3 has a heat conductivity of 4 x 10 4 to 15 ~ 10 4 cal./cm. sec~oc ~ more preferably 5 x 10 4 to 9 x 10 4 cal./cm. sec. C. l~hen the heat conductivity of the ink layer 3 is less than the above range, due to the momentary heating in one impression, a large amount of heat energy is required for securing the melt-transfer of the hot-melt ink layer 3. On the other hand, when the heat conductivity of the ink layer 3 is more than the above range, although the use is not limited, the production is difficult, and is not practical.
Thus, the preferred heat conductive material employed, according to the present invention, is the black color pigment such as acetylene black, lamp black, graphite, aniline black, KETJEN black (registered trademark of LION AKZO CO~IPANY LI~IITED~ or the like, or the metal powder such as aluminum, copper, tin, zinc or the like, and has a heat conductivity of 6.0 ~ 10 4 cal/sec. cm. C. Such a heat conductive material functions to accelerate the melting, softening and sublimating properties of the hot melt ink layer 3 which is applied to the back surface of the foundation 1, and ~S~OOl can shorten the time required for melting? softening and sublimating the ink. The heat conductive material is preferably used in amounts ranging from 2 to 30 parts by weight per lOq parts by .eight of the total amount of the ink. Thus, the hot-melt in~ layer 3 including the heat conductive material within the above range is superior in melt-transfer property, and thereby can easily produce the duplicated image 12 merely by contacting lightlv ~ith the copy sheet S, in addition to producing the most clear duplicated image 12.
The solid wax having a penetration of lO to 30 at 25C., is used as the binder material to increase the heat-sensitivity of the ink layer obtained. The solid wax is employed from waxes such as Japan wax, ceresin wax, bees~iax, spermaceti or the like. Further, if necessary, other hot-melting materials such as low-molecular polyethylene, oxidized wax and ester wax may be used, together with the above waxes.
Also, as a softener, easily heat-melted material such as polyvinyl acetate, polystyrene, styrene-butadiene copolymer, cellulose ester, cellulose ether, acrylic resin, or lubricating oil is suitably used. Further, as a coloring material, conventional standard dyes or pigments used in conventional copy papers can be used without special restriction.
Preferably, 5 to ~5 parts by weight of the binder material, 5 to 35 parts by weight of the softener and 5 to 25 parts by weight of the coloring material are used per 100 parts by weight of the total amount of the hot-melt ink layer 3. Thus, the ink layer 3 obtained is significantly excellent in melt-transfer property.
While the hot-melt ink layer 3 itself, according to the present invention, is softened by heating and then is melted, the ink layer 3 has the dra~back that the duplicated image 12 obtained causes spreading of the ink in the perfectly melted condition. Thus, it is desirable that, when the ink layer 3 starts to soften, the ink $1~0~
layer 3 is transferred, and further has adhesiveness at that stage.
According to the present invention, the above hot-melt ink layer ; is prepared so as to have a viscosity of 20 to 200 cP at 100C., as measured on a Brookfield type viscometer. Thus, it has now been found that, when the viscosity of the ink layer 3 is less than 20 cP, the duplicated image 12 obtained causes spread of the ink, and on the contrary, when the viscosity is more than 200 cP, transferability of the ink layer 3 becomes poor.
The viscosity of the ink layer 3 at the time of the melt-transfer significantly affects the transferability of the ink layer 3. Therefore, the range of the viscosity of the ink layer 3 in the melt-transfer should be prescribed.
~ s a result of various investigations, it has now been found that the ink layer 3 having a vicosity within the above range at 100C. is softened without completely melting bv the heat generated from the thermal head 7, and has an excellent viscosity under a soften condition, whereby the ink layer 3 has a significantly excellent melt-transfer property.
Also, the thermal color-developing layer 2 has a thickness less than 10 ~, and is ~repared by dispersing both a dye precursor capable of developing the color by reacting with acid and an organic or inorganic acid being a solid or semi-solid under room temperature in a suitable binder material, and then applying the obtained homogeneous suspension onto the foundation 1 as a coating layer. In the thermal color-developing layer 2, the suspended acid which is a solid or semi-solid is melt-liquefied by Joule's heat geneTated from the thermal head 7, and as a result, is reacted with a dye precurs~r to form the clear printed image 11.
As a dye precursor, various dye precursors such as phenothiazines, fluorans, leucoauramines, triphenylmethanes, spiropyrans or the like are prefera~l s~
employed. Also, as an organic or inorganic acid, benzoic acid, tartaric acid, citric acid, salicylic acid, stearic acid, gallic acid, Bisphenol A, na~htoic acid, pvrophosphoric acid, meta~hosphoric acid or the like is preferably employed.
Further, the heat-sensitive transfer element of the present invention may be prepared from a li commercially-available thermal paper, and in that case, the hot-melt ink layer 3 is coated on the reverse side of the color-developing surface in the thermal paper.
~ lso, the transfer element of the present invention may be prepared from the foundation 1 in which a coating li~uid comprising waxes or synthetic resins for¦ I
preventing the penetration of the ink layer 3 is ~ ¦
penetrated in advance, or if necessary, may be prepared by interposing a layer obtained from the above liquid for preventing the penetration between the foundation 1 and the color-developing layer 2.
The function and advantages of the heat-sensitive transfer element of the invention in case of printing by the thermal printer will be described below.
Fig. 2 shows the relationship between the heat-sensitive transfer element of the invention and the copy sheet in the course of printing. In Fig. 2, indicated as ~ is the heat-sensitive transfer element of the invention, comprising the foundation 1, the thermal color-developing surface 2 and the hot-melting ink layer 3, 5 is the copy sheet, 6 is the platen, 7 is the thermal head in which the exothermic resistance element is arranged in the form of the dot matrix such as 1 x 7, 5 x 7, 7 x 9 or the like, due to the printing pattern, 8 and 9 are terminals for impressing the pulse, and 10 is the printed image which is just forming.
The heat-sensitive transfer element 4 is attached to the thermal printer so that the hot melt ink layer 3 side is in contact with the copy sheet 5. The color-developing laver ~ is in contact with the thermal head 7, while the co~y sheet 5 is in contact with the platen 6~ As a copy sheet i, a conventional paper is em~loved~ When the pulse corresponding to the printing pattern is iml~ressed from the terminals ~ and 9, the thermal head 7 generates Joule's heat from the dots corresponding to the printing pattern. The Joule's heat generated is transmitted to the thermal color-developing layer 2, and melts the organic or inorganic acid, which is solid or semi-solid, and which is dispersed in the thermal color-developing layer 2, to ma~e the melted acid react with the dye precursor, whereby the printed image 10 corresponding to the printing pattern is formed. Furthermore, Joule's heat is instantaneously transmitted through the foundation 1 to the hot-melt ink layer 3, and partially melts the ink layer 3 corresponding to the printing pattern.
Fig. 3 shows a condition after impressing the pulse, and numerals of 1 to 9 indicate the same materials as the numerals of 1 to 9 in Fig. 2. 11 is a printed image formed perfectly, and 12 is a duplicated image.
After impressing the pulse, the thermal head 7, the heat-sensitive transfer element 4 and the copy sheet S are separated, and a part of the hot-melt in~
layer 3 melted in compliance with the printing pattern is released from the foundation 1, and transferred to the copy sheet 5, whereby the duplicated image 12 corresponding to the printing pattern is formed.
On the other hand, in the thermal color-developing layer 2, the color-development reaction between the dye precursor and the organic or inorganic acid has already been accomplished, and as a result, the clear printed image 11 has been formed.
Thus, the pulse impression is repeated, and the printing procedures are successively carried out.
Further, Figs. 2 to 3 show the embodiment of the case that the heat-sensitive transfer element ~ is placed on the copy sheet S to produce the duplicated ~1510~
image 1'. i`o the contrary, if the co~y sheet 5 has excellent heat conductivity, it is possible that the cop) sheet 5 is ~laced on the heat-sensitive transfer element, and is contacted with the thermal head 7 at the bac~ surfacc thereof.
The printed image 11 thus obtained has a sharp rrofile, and can be read hith ease.
~ lso, with respect to tne duplicated i~age 11, since the melt-transfer property of the hot-melt ink layer ~ is increased by the function of the heat-conductive material, and has a coating weight of 1 to lS
g /cm.2 allo-.ing an excellent melt-transfer property as mentioned above, the duplicated image 11 is formed on the copy sheet 5 l~ith ease, and since the amount of the transferring ink is suitable, the clear duplicated image 1' obtained by transferring the solid hot-melt ink is highly durable and difficult to alter. Accordingly, such a duplicated image 12 is particularly effective in case requiring storage over a long period of time.
Furthermore, according to the present invention, since the back surface of the foundation 1 has excellent smoothness and heat conductivit~;, and further the organic or inor~anic acid in the color-developing layer
2 and both the binder material and the softener in the hot-melt ink layer 3 have excellent melting velocity, both the printed image 11 and the duplicated image 12 with sufficient clarity can be conventionally formed by the thermal pulse of about 6/1000 seconds (13wt./mm2).
Accordingly, the heat-sensitive transfer element ~ of the invention can be used at a high printing speed of about 60 characters per second, and can duplicate the clear duplicated image 12 with ease at about 2 times the printing speed in the case of using two sheets of conventional thermal paper, due to the excellent melt-transfer property thereof, and therefore is preferably used as a transfer element in the thermal printing device such as a thermal printer or the like, re~uiring a high printing speed.
Accordingly, the heat-sensitive transfer element ~ of the invention can be used at a high printing speed of about 60 characters per second, and can duplicate the clear duplicated image 12 with ease at about 2 times the printing speed in the case of using two sheets of conventional thermal paper, due to the excellent melt-transfer property thereof, and therefore is preferably used as a transfer element in the thermal printing device such as a thermal printer or the like, re~uiring a high printing speed.
Claims (7)
1. A heat-sensitive transfer element comprising a foun-dation in which the back surface has a Bekk smoothness of 60 to 20000 seconds, a thermal color-developing layer provided on the front surface of said foundation, and a hot-melt ink layer pro-vided on the back surface; the hot-melt ink layer including a heat-conductive material powder which has a heat conductivity of 6.0 X 10-4 to 25.0 X 10-4 cal./sec. cm. °C., and a solid wax which has a penetration of 10 to 30 at 25°C. as a binder material, and having a viscosity of 20 to 200 cP at 100°C.
2. The transfer element of claim 1, wherein said ther-mal color-developing layer is a coating layer prepared by dis-persing dye precursor and an acid which is solid or semi-solid in a binder material, and has a thickness less than about 10 µ.
3. The transfer element of claim 1 or 2, wherein said hot-melt ink layer further includes a coloring material and a softener, and has a coating weight of about 1 to 15 g./m?
4. The transfer element of claim 1 or 2, wherein said hot-melt ink layer further includes a coloring material and a softener, and has a coating weight of about 1 to 15 g./m?, and wherein 2 to 30 parts by weight of said heat-conductive material, 5 to 25 parts by weight of the coloring material, 5 to 85 parts by weight of the binder material and 5 to 35 parts by weight of the softener are used per 100 parts by weight of the total amount of the hot-melt ink layer.
5. The transfer element of claim 1, wherein said back surface of the foundation has a Bekk smoothness of 200 to 16000 seconds.
6. The transfer element of claim 1, wherein said foun-dation is a paper having a thickness of 20 to 60 µ and a den-sity of 0.75 to 1.3 g./cm3.
7. The transfer element of claim 1, wherein said hot-melt ink layer has a heat conductivity of 4 X 10-4 to 15 X 10-4 cal./cm. sec. °C.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15350679A JPS5675894A (en) | 1979-11-26 | 1979-11-26 | Thermal recording medium |
JP153506/1979 | 1979-11-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
CA1151001A true CA1151001A (en) | 1983-08-02 |
Family
ID=15564030
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA000363875A Expired CA1151001A (en) | 1979-11-26 | 1980-11-03 | Heat-sensitive transfer element |
Country Status (9)
Country | Link |
---|---|
US (1) | US4315643A (en) |
JP (1) | JPS5675894A (en) |
CA (1) | CA1151001A (en) |
CH (1) | CH650978A5 (en) |
DE (1) | DE3043866A1 (en) |
FR (1) | FR2470008B1 (en) |
GB (1) | GB2069159B (en) |
HK (1) | HK5589A (en) |
IT (1) | IT1133748B (en) |
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US6245416B1 (en) | 1998-05-20 | 2001-06-12 | Ncr Corporation | Water soluble silicone resin backcoat for thermal transfer ribbons |
US6231964B1 (en) | 1998-06-30 | 2001-05-15 | Ncr Corporation | Thermal transfer ribbons with large size wax or resin particles |
US6171690B1 (en) | 1998-08-28 | 2001-01-09 | Ncr Corporation | Thermal transfer media with a mixture of non-melting solid particles of distinct sizes |
US6166755A (en) * | 1998-10-27 | 2000-12-26 | Ncr Corporation | Thermal transfer ribbon with paper leader and trailer |
JP2000296631A (en) * | 1999-04-16 | 2000-10-24 | Ricoh Co Ltd | Method for forming image and apparatus therefor |
US6517239B1 (en) | 1999-04-30 | 2003-02-11 | Ncr Corproation | Time-temperature indicators activated with thermal transfer printing and methods for their production |
US6790493B2 (en) | 2001-12-21 | 2004-09-14 | Ncr Corporation | Epoxy curing agent emulsification for TTR application |
US6989180B2 (en) * | 2003-10-09 | 2006-01-24 | Ncr Corporation | Thermal transfer ribbon with end of ribbon markers |
US7645719B2 (en) * | 2004-10-13 | 2010-01-12 | Ncr Corporation | Thermal paper with security features |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL251591A (en) * | 1959-05-15 | |||
US3859094A (en) * | 1973-01-05 | 1975-01-07 | Minnesota Mining & Mfg | Sheet material useful in image transfer techniques |
JPS5143788B2 (en) * | 1973-07-19 | 1976-11-24 | ||
JPS5483841A (en) * | 1977-12-16 | 1979-07-04 | Mitsubishi Paper Mills Ltd | Heat sensitive paper that printing quality is improved |
JPS5483842A (en) * | 1977-12-17 | 1979-07-04 | Nippon Telegr & Teleph Corp <Ntt> | Thermal recording medium |
-
1979
- 1979-11-26 JP JP15350679A patent/JPS5675894A/en active Pending
-
1980
- 1980-05-23 US US06/152,769 patent/US4315643A/en not_active Expired - Lifetime
- 1980-11-03 CA CA000363875A patent/CA1151001A/en not_active Expired
- 1980-11-06 IT IT2580780A patent/IT1133748B/en active
- 1980-11-07 GB GB8035888A patent/GB2069159B/en not_active Expired
- 1980-11-13 FR FR8024159A patent/FR2470008B1/en not_active Expired
- 1980-11-21 DE DE19803043866 patent/DE3043866A1/en active Granted
- 1980-11-25 CH CH8716/80A patent/CH650978A5/en not_active IP Right Cessation
-
1989
- 1989-01-19 HK HK5589A patent/HK5589A/en unknown
Also Published As
Publication number | Publication date |
---|---|
GB2069159B (en) | 1983-10-05 |
HK5589A (en) | 1989-01-27 |
US4315643A (en) | 1982-02-16 |
CH650978A5 (en) | 1985-08-30 |
GB2069159A (en) | 1981-08-19 |
IT1133748B (en) | 1986-07-09 |
DE3043866C2 (en) | 1987-09-24 |
FR2470008A1 (en) | 1981-05-29 |
FR2470008B1 (en) | 1986-07-04 |
JPS5675894A (en) | 1981-06-23 |
IT8025807A0 (en) | 1980-11-06 |
DE3043866A1 (en) | 1981-05-27 |
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MKEX | Expiry | ||
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