CA1049312A - Presensitized printing plate with in-situ, laser imageable mask - Google Patents
Presensitized printing plate with in-situ, laser imageable maskInfo
- Publication number
- CA1049312A CA1049312A CA216,681A CA216681A CA1049312A CA 1049312 A CA1049312 A CA 1049312A CA 216681 A CA216681 A CA 216681A CA 1049312 A CA1049312 A CA 1049312A
- Authority
- CA
- Canada
- Prior art keywords
- layer
- ultraviolet light
- plate
- plate according
- opaque
- 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
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/20—Exposure; Apparatus therefor
- G03F7/2002—Exposure; Apparatus therefor with visible light or UV light, through an original having an opaque pattern on a transparent support, e.g. film printing, projection printing; by reflection of visible or UV light from an original such as a printed image
- G03F7/2014—Contact or film exposure of light sensitive plates such as lithographic plates or circuit boards, e.g. in a vacuum frame
- G03F7/2016—Contact mask being integral part of the photosensitive element and subject to destructive removal during post-exposure processing
- G03F7/202—Masking pattern being obtained by thermal means, e.g. laser ablation
Abstract
ABSTRACT OF THE DISCLOSURE
A planographic printing plate comprising a layer of material which is sensitive to ultraviolet light and overlying said layer, a second layer which is opaque to ultraviolet light and capable of being removed or rendered transparent to ultra-violet light by non-actinic laser radiation.
A planographic printing plate comprising a layer of material which is sensitive to ultraviolet light and overlying said layer, a second layer which is opaque to ultraviolet light and capable of being removed or rendered transparent to ultra-violet light by non-actinic laser radiation.
Description
~his invention relates to planographic printing plate~ and more particularly, to plates having a mask layer capable of ~eing selectively removed by a laser beam to form the pattern desired to be printed.
Lithographic printing, frequently re~erred to as offset printing, occupies a substantial segment of the print-ing plate market, primarily because it is an economical method for producing a large number of copie~. Most litho-graphic plates today are of the presensitized type. Such plates are provided with a photosensitive coating which per-mits the formation of an image on the plate by exposure through a master transparency and sub~e~uent development.
It has recently been proposed, see United States Patent 3,664,737 granted May 23, 1972 for "Printing Plate Recording by Direct Exposure" (Lipp), to directly record information on a printing plate by means of a laser beam having a wave length in the actinic (UV) region. There are two major advantages of imaging by a laser beam. The first is that it permits the elimination of the master transparency.
The images can be either computer generated or can be pro-vided by scanning a paste-up or other original by appropriate photoelectronic means which in turn modulates the laser `i ~ S~9~1 ~ beam. The second advantage is that the ainglc, however gen-; erated, for modulating the laser which writes the image on the plate can be transmitted over great distances to a multi-
Lithographic printing, frequently re~erred to as offset printing, occupies a substantial segment of the print-ing plate market, primarily because it is an economical method for producing a large number of copie~. Most litho-graphic plates today are of the presensitized type. Such plates are provided with a photosensitive coating which per-mits the formation of an image on the plate by exposure through a master transparency and sub~e~uent development.
It has recently been proposed, see United States Patent 3,664,737 granted May 23, 1972 for "Printing Plate Recording by Direct Exposure" (Lipp), to directly record information on a printing plate by means of a laser beam having a wave length in the actinic (UV) region. There are two major advantages of imaging by a laser beam. The first is that it permits the elimination of the master transparency.
The images can be either computer generated or can be pro-vided by scanning a paste-up or other original by appropriate photoelectronic means which in turn modulates the laser `i ~ S~9~1 ~ beam. The second advantage is that the ainglc, however gen-; erated, for modulating the laser which writes the image on the plate can be transmitted over great distances to a multi-
-2--- -.
iO49312 plicity of writing lasers, This obviously would be of par-ticular significance to newspaper and magazine publishers who operate a number of regional printing facilities.
While the laser is a promising tool for the produc-tion of planographic printing plates and the proposal todirectly image a presensitized lithographic printing plate with a laser beam having a wave length in the actinic region has great appeal, the proposal is not c~mmercially practical for the reason that such lasers are extremely expensive, are not generally commercially available and, to date, their power output has been low. There are, on the other hand, non-actinic lasers available which are relatively inexpensive and which have a useful pGwer output.
Therefore an object of this invention is to utilize non-actinic laser beams in the imaging of conventional pre-sensitized planographic printing plates.
In accordance with the present invention there is provided a planographic printing plate comprising a sup-port layer, a first layer of material which is sensitiveto ul-traviolet lightand is overlying said support layer, and asecond layer which is opaque to ultraviolet light and cap-able of being removed or rendered transparent to ultraviolet light by non-actinic laser radiation while said second layer is overlying and in contact with said first layer, the mat-erial of said first layer being unaffected by the non-actinic laser radiation. A mask or template is formed on the pre-sensitized plate by selectively removing the layer which is opaque to ultraviolet light by means of an appropriate laser beam. The beam of radiant energy is applied to the opaque layer to vaporize and remo~e it in selected areas so that the remaining areas of the opaque layer define the areas which are to be exposed to ultraviolet.
The presensitized printing plate underlying the mask layer can be any one of the commercially available types B~ -3-... .
of either positive working or negative working lithographic printing plates or it can be a dry planographic printing plate such as disclosed in United States Patent 3,606,922, Doggett, granted Septem~er 21, 1971. The c~n~tructi~n or composition of the presensitized printing plate portion of the plate of the present invention is not critical for the reason that once the mask is formea in situ and the plate is exposed to ultra~iolet light, development of the plate pro ceeds in a conventional manner.
The layer of material which is opaque to ultra-violet light and capable of being removed or rendered trans-parent to ultraviolet light by non-actinic laser radiation can be a metal layer or a dispersion of metal or carbon par-ticles in an organic binder. Suitable metals include aluminum, copper and zinc. The metal film must be thick enough to be opaque to ultraviolet and it will normally be made as thin as practical in order for it to be vaporized and removed rapidly with a minimum amount of radiant energy applied by the laser for this purpose. By way of example, a zinc film on the order of one micro-inch in thickness satisfies the criteria. A suitable method for forming films of metal at such thickness is vacuum deposition. ~he layer o~ metal can be applied directly to the photosensitive surface of the presensitized printing plate but may also advanta-geously be applied to a thin film of a plastic such as a poly-estèr which is then applied to the presensitized printing plate surface.
As indicated by United States Patent 3,650,796 granted March 21, 1972 for "Photolithographic Masks", selec-tion of an appropriate laser for removing the layer of .. , .
104~31Z
material which is opaque to ultraviolet light is well within the skill of the ordinary worker in the art to which the present invention pertains. Means for modulating a laser beam to record information on a substrate are also well known in the art and need not be discussed here. In general they can be characterized as scanning mechanisms which cause the beam to traverse the area, delivering energy in a predetermined manner. Suitable apparatus is disclosed in United State~ Patent 3,739,088 granted ~une 12, 1973.
In the following examples a negative working diazo composition, the reaction product of p-diazodiphenylamine-formaldehyde condensation product and sodium lauryl sulfate was employed. The laser employed was a YAG(yttrium aluminum garnet) laser.
Example I
Illustrating the use of an aluminum mask.
Platè: An anodized and silicated 8 mil aluminum base coated with the identified ultraviolet sensitive (UV) coating by ~10 mayer rod in an amount of 0.8 lbs./ream;
Over this dried coating was deposited from vapor in vacuum a 300 angstrom aluminum layer (mask).
Processing: This mask was removed in selected areas by writing with a laser;
The entire plate was exposed for 60 seconds 2S to a carbon arc whereby no longer masked W sensitive areas were photopolymerized:
; The remaining mask was removed using a 2 a~ueous potassium hydroxide solution;
The unexposed W sensitive layer was then removed by the application of a subtractive deve~oper.
Example II
Illustrating the use of a copper mask.
Plate: A 12 mil substrate that was a paper-aluminum foil laminate was coated on its paper surface ~ith a PVA
composition to render it hydrophilic. To this substrate was applied the ultraviolet (UV) sensitive coating by #10 mayer rod in an amount of about 0.1 lbs./reami Finally over this dried coating was deposited a 50 angstrom copper layer deposited from vapor in vacuum.
Processing: The plate was processed according to ~xample I with the exception that the UV sensitive layer was exposed to the carbon arc for 30 seconds.
On development a faint image was obtained.
Example III
I11ustrating the use of a laminate mask.
Plate: To the ultraviolet tUV) sensitive coated base of Example I was adhered a mask which consisted of a vacuum deposited zinc layer on a polycarbonate film (film side adhered to base by an adhesive).
Processing: This plate was laser scanned and then overall exposed to W light for 45 seconds. Following this, the film was separated from the plate and the plate was subsequently developed with subtractive developer.
Example IV
Illustrating the use of a pigmented mask.
Plate: The aluminum base with the ultraviolet sensitive ' coating of Example I was coated with the following mas~ com- position:
.
. ,- ~ . ~ . . . ~
~gb~
Carbon black 30.2 Nitrocellulose 30.2 Aluminum powder 10.4 Phenolic resin 29.2 50/50 (by volume) mixture of xylene and ethyl cellosolve was added to adjust the solids content to 6.9~ by weight.
The ma~k layer was applied at a weight of 0.7 lbs./ream.
~ rocessing: The plate was processed according to Example III. When mounted on an offset duplicating press the plate provided good quality prints.
Example V
Illustrating the use of a pigmented mask.
Plate: The aluminum base with the ultra~iolet sensi-ti~e coating of Example I was coa~ed with the following masX
composition:
Parts by weight dry Carbon black 25 Nitrocellulose 17.5 Alkyd resin 57.5 Methyl ethyl ketone was added to adjust the solids content to 8~ by weight. The coating was applied by #10 mayer rod in an amount of 1.0 lbs./ream.
Processing: The plate was processed according to the previouæ examples with the exception that the W sensitive layer was exposed to the carbon arc for 2 minutes.
... . .
. ~
-
iO49312 plicity of writing lasers, This obviously would be of par-ticular significance to newspaper and magazine publishers who operate a number of regional printing facilities.
While the laser is a promising tool for the produc-tion of planographic printing plates and the proposal todirectly image a presensitized lithographic printing plate with a laser beam having a wave length in the actinic region has great appeal, the proposal is not c~mmercially practical for the reason that such lasers are extremely expensive, are not generally commercially available and, to date, their power output has been low. There are, on the other hand, non-actinic lasers available which are relatively inexpensive and which have a useful pGwer output.
Therefore an object of this invention is to utilize non-actinic laser beams in the imaging of conventional pre-sensitized planographic printing plates.
In accordance with the present invention there is provided a planographic printing plate comprising a sup-port layer, a first layer of material which is sensitiveto ul-traviolet lightand is overlying said support layer, and asecond layer which is opaque to ultraviolet light and cap-able of being removed or rendered transparent to ultraviolet light by non-actinic laser radiation while said second layer is overlying and in contact with said first layer, the mat-erial of said first layer being unaffected by the non-actinic laser radiation. A mask or template is formed on the pre-sensitized plate by selectively removing the layer which is opaque to ultraviolet light by means of an appropriate laser beam. The beam of radiant energy is applied to the opaque layer to vaporize and remo~e it in selected areas so that the remaining areas of the opaque layer define the areas which are to be exposed to ultraviolet.
The presensitized printing plate underlying the mask layer can be any one of the commercially available types B~ -3-... .
of either positive working or negative working lithographic printing plates or it can be a dry planographic printing plate such as disclosed in United States Patent 3,606,922, Doggett, granted Septem~er 21, 1971. The c~n~tructi~n or composition of the presensitized printing plate portion of the plate of the present invention is not critical for the reason that once the mask is formea in situ and the plate is exposed to ultra~iolet light, development of the plate pro ceeds in a conventional manner.
The layer of material which is opaque to ultra-violet light and capable of being removed or rendered trans-parent to ultraviolet light by non-actinic laser radiation can be a metal layer or a dispersion of metal or carbon par-ticles in an organic binder. Suitable metals include aluminum, copper and zinc. The metal film must be thick enough to be opaque to ultraviolet and it will normally be made as thin as practical in order for it to be vaporized and removed rapidly with a minimum amount of radiant energy applied by the laser for this purpose. By way of example, a zinc film on the order of one micro-inch in thickness satisfies the criteria. A suitable method for forming films of metal at such thickness is vacuum deposition. ~he layer o~ metal can be applied directly to the photosensitive surface of the presensitized printing plate but may also advanta-geously be applied to a thin film of a plastic such as a poly-estèr which is then applied to the presensitized printing plate surface.
As indicated by United States Patent 3,650,796 granted March 21, 1972 for "Photolithographic Masks", selec-tion of an appropriate laser for removing the layer of .. , .
104~31Z
material which is opaque to ultraviolet light is well within the skill of the ordinary worker in the art to which the present invention pertains. Means for modulating a laser beam to record information on a substrate are also well known in the art and need not be discussed here. In general they can be characterized as scanning mechanisms which cause the beam to traverse the area, delivering energy in a predetermined manner. Suitable apparatus is disclosed in United State~ Patent 3,739,088 granted ~une 12, 1973.
In the following examples a negative working diazo composition, the reaction product of p-diazodiphenylamine-formaldehyde condensation product and sodium lauryl sulfate was employed. The laser employed was a YAG(yttrium aluminum garnet) laser.
Example I
Illustrating the use of an aluminum mask.
Platè: An anodized and silicated 8 mil aluminum base coated with the identified ultraviolet sensitive (UV) coating by ~10 mayer rod in an amount of 0.8 lbs./ream;
Over this dried coating was deposited from vapor in vacuum a 300 angstrom aluminum layer (mask).
Processing: This mask was removed in selected areas by writing with a laser;
The entire plate was exposed for 60 seconds 2S to a carbon arc whereby no longer masked W sensitive areas were photopolymerized:
; The remaining mask was removed using a 2 a~ueous potassium hydroxide solution;
The unexposed W sensitive layer was then removed by the application of a subtractive deve~oper.
Example II
Illustrating the use of a copper mask.
Plate: A 12 mil substrate that was a paper-aluminum foil laminate was coated on its paper surface ~ith a PVA
composition to render it hydrophilic. To this substrate was applied the ultraviolet (UV) sensitive coating by #10 mayer rod in an amount of about 0.1 lbs./reami Finally over this dried coating was deposited a 50 angstrom copper layer deposited from vapor in vacuum.
Processing: The plate was processed according to ~xample I with the exception that the UV sensitive layer was exposed to the carbon arc for 30 seconds.
On development a faint image was obtained.
Example III
I11ustrating the use of a laminate mask.
Plate: To the ultraviolet tUV) sensitive coated base of Example I was adhered a mask which consisted of a vacuum deposited zinc layer on a polycarbonate film (film side adhered to base by an adhesive).
Processing: This plate was laser scanned and then overall exposed to W light for 45 seconds. Following this, the film was separated from the plate and the plate was subsequently developed with subtractive developer.
Example IV
Illustrating the use of a pigmented mask.
Plate: The aluminum base with the ultraviolet sensitive ' coating of Example I was coated with the following mas~ com- position:
.
. ,- ~ . ~ . . . ~
~gb~
Carbon black 30.2 Nitrocellulose 30.2 Aluminum powder 10.4 Phenolic resin 29.2 50/50 (by volume) mixture of xylene and ethyl cellosolve was added to adjust the solids content to 6.9~ by weight.
The ma~k layer was applied at a weight of 0.7 lbs./ream.
~ rocessing: The plate was processed according to Example III. When mounted on an offset duplicating press the plate provided good quality prints.
Example V
Illustrating the use of a pigmented mask.
Plate: The aluminum base with the ultra~iolet sensi-ti~e coating of Example I was coa~ed with the following masX
composition:
Parts by weight dry Carbon black 25 Nitrocellulose 17.5 Alkyd resin 57.5 Methyl ethyl ketone was added to adjust the solids content to 8~ by weight. The coating was applied by #10 mayer rod in an amount of 1.0 lbs./ream.
Processing: The plate was processed according to the previouæ examples with the exception that the W sensitive layer was exposed to the carbon arc for 2 minutes.
... . .
. ~
-
Claims (10)
1. A planographic printing plate comprising a support layer, a first layer of material which is sensitive to ultra-violet light and is overlying said support layer, and a second layer which is opaque to ultraviolet light and capable of being removed or rendered transparent to ultraviolet light by non-actinic laser radiation while said second layer is overlying and in contact with said first layer, the material of said first layer being unaffected by the non-actinic laser radiation.
2. A plate according to claim 1, wherein the material of said first layer which is sensitive to ultraviolet light is ren-dered insoluble and ink receptive upon exposure to ultraviolet light.
3. The plate according to claim 1, wherein the material of the first layer which is sensitive to ultraviolet light is decomposed by ultraviolet light.
4. The plate according to claim 1, wherein the second layer which is opaque to ultraviolet light is a metal layer.
5. The plate according to claim 4, wherein the metal is aluminum, copper or zinc.
6. The plate according to claim 1, wherein the second layer which is opaque to ultraviolet light comprises a disper-sign of carbon particles in an organic binder.
7. The plate according to claim 6, wherein the second layer further includes powder metal.
8. The plate according to claim 6, wherein the binder is nitrocellulose.
9. The plate according to claim 2, wherein the material is a diazonium compound.
10. The method of imaging a planographic printing plate which comprises a support layer, a second layer of material which is sensitive to ultraviolet light and is overlying the support layer, and overlying and in contact with the first layer, a second layer which is opaque to ultraviolet light and is cap-able of being removed or rendered transparent to ultraviolet light by non-actinic laser radiation, said method comprising the steps of:
selectively removing or rendering transparent to ultraviolet light selected areas of the second layer while not affecting the first layer of material by projecting a beam of non-actinic laser radiation onto the second layer while in contact with the first layer, exposing said plate overall to ultraviolet light, removing the remaining portions of the first layer, and developing said plate.
selectively removing or rendering transparent to ultraviolet light selected areas of the second layer while not affecting the first layer of material by projecting a beam of non-actinic laser radiation onto the second layer while in contact with the first layer, exposing said plate overall to ultraviolet light, removing the remaining portions of the first layer, and developing said plate.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US43425574A | 1974-01-17 | 1974-01-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1049312A true CA1049312A (en) | 1979-02-27 |
Family
ID=23723484
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA216,681A Expired CA1049312A (en) | 1974-01-17 | 1974-12-23 | Presensitized printing plate with in-situ, laser imageable mask |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US4132168A (en) |
| JP (1) | JPS516568B2 (en) |
| CA (1) | CA1049312A (en) |
| DE (1) | DE2500907B2 (en) |
| FR (1) | FR2258649B1 (en) |
| GB (1) | GB1492070A (en) |
| IT (1) | IT1026287B (en) |
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| JP3750805B2 (en) * | 2002-04-12 | 2006-03-01 | 東洋紡績株式会社 | Photosensitive printing master |
| TWI297809B (en) * | 2001-10-24 | 2008-06-11 | Toyo Boseki | |
| ES2319117T3 (en) * | 2002-10-24 | 2009-05-04 | Toray Industries, Inc. | ORIGINAL FOR PRINT IRON WITH PHOTOSENSIBLE RESIN, PROCESS TO PRODUCE THE SAME AND PROCESS TO PRODUCE WITH THIS A PRINT IRON IN RELIEF WITH RESIN. |
| JP2005221842A (en) * | 2004-02-06 | 2005-08-18 | Lintec Corp | Member for mask film, method for manufacturing mask film using the same, and method for manufacturing photosensitive resin printing plate |
| US20080274424A1 (en) | 2007-05-05 | 2008-11-06 | Yisong Yu | Positive photosensitive element comprising vinyl polymers |
| JP4200510B1 (en) * | 2008-06-11 | 2008-12-24 | 東洋紡績株式会社 | Photosensitive flexographic printing plate |
| JP4247725B1 (en) | 2008-07-16 | 2009-04-02 | 東洋紡績株式会社 | Photosensitive relief printing original plate |
| CN101762982B (en) | 2008-12-24 | 2013-03-13 | 成都新图新材料股份有限公司 | Infrared positive thermal-sensitive offset plate |
| JP5658435B2 (en) * | 2009-03-31 | 2015-01-28 | リンテック株式会社 | Mask film member, mask film manufacturing method using the same, and photosensitive resin printing plate manufacturing method |
| EP2738606B1 (en) * | 2012-11-28 | 2024-01-31 | XSYS Prepress N.V. | Method and computer program product for processing a flexographic plate. |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3207621A (en) * | 1960-08-16 | 1965-09-21 | Columbia Ribbon & Carbon | Novel hectograph transfer sheet and process |
| US3373021A (en) * | 1964-01-29 | 1968-03-12 | Harris Intertype Corp | Presensitized positive working lithographic plate |
| US3934503A (en) * | 1967-06-26 | 1976-01-27 | Iit Research Institute | Stencil screens |
| GB1208414A (en) * | 1966-10-24 | 1970-10-14 | Agfa Gevaert Nv | Improvements relating to thermo recording |
| GB1187980A (en) * | 1966-10-28 | 1970-04-15 | Ilford Ltd | Presensitised Lithographic Plates. |
| US3392501A (en) * | 1967-03-13 | 1968-07-16 | James M. Gilchrist Jr. | Method of marking covered items |
| GB1170495A (en) * | 1967-03-31 | 1969-11-12 | Agfa Gevaert Nv | Radiation-Sensitive Recording Material |
| US3574657A (en) * | 1967-12-14 | 1971-04-13 | Fmc Corp | Polymeric images formed by heat |
| US3707372A (en) * | 1968-02-19 | 1972-12-26 | Teeg Research Inc | Electromagnetic radiation sensitive elements |
| GB1237433A (en) * | 1968-06-06 | 1971-06-30 | Standard Telephones Cables Ltd | Improvements in or relating to photolithographic masks |
| BE760067A (en) * | 1969-12-09 | 1971-06-09 | Applied Display Services | METHOD AND APPARATUS FOR THE MANUFACTURING OF SURFACE PLATES AS WELL AS PRINTING PLATES THEREFORE OBTAINED |
| US3689768A (en) * | 1970-06-18 | 1972-09-05 | Masamichi Sato | Electron beam recording materials |
| US3660088A (en) * | 1970-09-16 | 1972-05-02 | Grace W R & Co | Photo-resist process |
| US3773514A (en) * | 1971-08-12 | 1973-11-20 | Fromson H A | Light-sensitive structure |
-
1974
- 1974-12-23 CA CA216,681A patent/CA1049312A/en not_active Expired
- 1974-12-24 GB GB55845/74A patent/GB1492070A/en not_active Expired
-
1975
- 1975-01-09 IT IT47599/75A patent/IT1026287B/en active
- 1975-01-09 DE DE2500907A patent/DE2500907B2/en not_active Withdrawn
- 1975-01-10 FR FR7500696A patent/FR2258649B1/fr not_active Expired
- 1975-01-10 JP JP50005503A patent/JPS516568B2/ja not_active Expired
-
1977
- 1977-07-25 US US05/818,644 patent/US4132168A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US4132168A (en) | 1979-01-02 |
| DE2500907A1 (en) | 1975-07-24 |
| FR2258649A1 (en) | 1975-08-18 |
| DE2500907B2 (en) | 1979-01-11 |
| JPS516568B2 (en) | 1976-02-28 |
| IT1026287B (en) | 1978-09-20 |
| GB1492070A (en) | 1977-11-16 |
| FR2258649B1 (en) | 1977-07-01 |
| JPS50102401A (en) | 1975-08-13 |
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