CA1102065A - Flexible sheet material - Google Patents
Flexible sheet materialInfo
- Publication number
- CA1102065A CA1102065A CA295,042A CA295042A CA1102065A CA 1102065 A CA1102065 A CA 1102065A CA 295042 A CA295042 A CA 295042A CA 1102065 A CA1102065 A CA 1102065A
- Authority
- CA
- Canada
- Prior art keywords
- sheet
- temperature
- pressing
- sheet material
- wear
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
- B29C67/20—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 for porous or cellular articles, e.g. of foam plastics, coarse-pored
- B29C67/207—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 for porous or cellular articles, e.g. of foam plastics, coarse-pored comprising impregnating expanded particles or fragments with a binder
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
- B29C44/10—Applying counter-pressure during expanding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/48—Wearing apparel
- B29L2031/50—Footwear, e.g. shoes or parts thereof
- B29L2031/504—Soles
-
- 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
- Y10S264/00—Plastic and nonmetallic article shaping or treating: processes
- Y10S264/07—Binding and molding cellular particles
-
- 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
- Y10S521/00—Synthetic resins or natural rubbers -- part of the class 520 series
- Y10S521/918—Physical aftertreatment of a cellular product
Abstract
Title: Flexible Sheet Material ABSTRACT OF THE DISCLOSURE
A wear-resistant flexible sheet material, suitable for use as outer soles on footwear, is produced by pressing reconstituted polyurethane foam sheets in the substantial absence of air at temperatures above 150°C. The sheets should have a density exceeding 15 lb/ft2 and are further densi-fied by the hot pressing. The sheets are preferably pre-heated to 175-210°C and pressed under a pressure of 5 to 30 tons/ft2 for periods of up to 5 minutes.
The sheets may be embossed or smooth surfaced and may contain pigments, plasticisers and other additions.
A wear-resistant flexible sheet material, suitable for use as outer soles on footwear, is produced by pressing reconstituted polyurethane foam sheets in the substantial absence of air at temperatures above 150°C. The sheets should have a density exceeding 15 lb/ft2 and are further densi-fied by the hot pressing. The sheets are preferably pre-heated to 175-210°C and pressed under a pressure of 5 to 30 tons/ft2 for periods of up to 5 minutes.
The sheets may be embossed or smooth surfaced and may contain pigments, plasticisers and other additions.
Description
11~2~65 The present invention relates to flexible sheet material prepared from foamed polyurethane and exhibiting good wear resist-ance, making it suitable for such purposes as outer soles for footwear.
Reconstituted foam materials, in which communited foam is bonded together with a foamable binder, have been known for some considerable time and a method for their preparation has been de-scribed in our British Patent No. 976,26Q. These reconstituted materials are useful, for example, in packaging and upholstery.
More recently, materials of higher density have been pro-duced, as described in our British Patent No. 1,337,413, in which much of the cellularity of the comminuted foam is lost by reduction to a small particle size, and in which the binder exhibits little or no expansion owing to the pressure under which the product is moulded. Such denser materials are employed, for example, for in-soles in the footwear industry.
We have now discovered that if a relatively dense flexible reconstituted foam material composed wholly or predominantly of polyurethane and having a density exceeding 15 lb~ft3, is subjected to pressure of about 5 to 30 tons~ft at a temperature above 150C
in the substantial absence of air, it can be further densified and formed into a flexible sheet material having wear resistance significantly greater than that of ~'
Reconstituted foam materials, in which communited foam is bonded together with a foamable binder, have been known for some considerable time and a method for their preparation has been de-scribed in our British Patent No. 976,26Q. These reconstituted materials are useful, for example, in packaging and upholstery.
More recently, materials of higher density have been pro-duced, as described in our British Patent No. 1,337,413, in which much of the cellularity of the comminuted foam is lost by reduction to a small particle size, and in which the binder exhibits little or no expansion owing to the pressure under which the product is moulded. Such denser materials are employed, for example, for in-soles in the footwear industry.
We have now discovered that if a relatively dense flexible reconstituted foam material composed wholly or predominantly of polyurethane and having a density exceeding 15 lb~ft3, is subjected to pressure of about 5 to 30 tons~ft at a temperature above 150C
in the substantial absence of air, it can be further densified and formed into a flexible sheet material having wear resistance significantly greater than that of ~'
- 2 - ,-~'''~'^,r$S
llQ2Q65 the or~inal recorlstitllted material. In this way it is possible to ~ake dense, yet flexible and resilient material suitable for use as outer soles c~nd exhibiting lon~ life -in such use.
I~ had previously been thouKht that heat-forming of polyurethane materials above about 160C would decompose the pol~lrethane structure and not give useful r~sults but we ha~e surpIisingly found that heat-forming of dense reconsti-tuted foam materials is possible in the substantial absence of air. It is not in all cases necessary to co~pletely enc?ose the material to be hot-formed; compression of sheet material between solid heating platens will often suffice~
~he platens exclude air from all but the peripheral edges of the sheet, while the high density of the starting material ~5 means that there is little air within the material~ Substan-tial amounts of entrappea air can hinder the transfer of heat and cause embrittlement of the product through oxidative decomposition.
During pressing th~ granular appearance of the material is lost ~nd any surface embossment on the heated pressure surfaces is i~pressed on the material and becomes a permanent feature o~ the product. An increase in density can also be observed.
DESCRI:~'rION O:F 5;~, ~1 ~:ltll:lLii'l ~ypical temperature and pressure conditions ~re about 210C and about 120 p.s~i. respectively. ~he time necessary - is of the order of a fe~ minutes, but varies with t-he thick-ness and density of ths starting material.
l~ZC)65 ~ioxe ~el~ally, the preferred tempe.rature range of the recon~.tituted foa~ material to be pressed is from 150 to 250C. lt hzs been found beneficial to pre-heat the material before p~essing si.~ce this makes possible greater throughput in the pressin~ stage. Preferred pre-heatin~; condltions c~e 1-5 minutes between i~fra-red radiators to a temperature of 150-250 and more especially 175 to 210C.
r~he preferred pressures employed i~ the pressing~ stage are in thè ran~e 5 to 30 tons/ft2, more especially from 10 to 25 tons/ft2. r~he dwell times of the foam material in -the press depend on the thickness of the starting material and on the type of emboss required~ Longer times are needed for deeply embossed surfaces as compared with smooth surfaces.
By way of exa~ple, the followin~ are typical pressing times for different thiclmesses of sheet:-For a deep embossO
2.5 mm thickness 2 minutes 2.8 mm " 2~ "
llQ2Q65 the or~inal recorlstitllted material. In this way it is possible to ~ake dense, yet flexible and resilient material suitable for use as outer soles c~nd exhibiting lon~ life -in such use.
I~ had previously been thouKht that heat-forming of polyurethane materials above about 160C would decompose the pol~lrethane structure and not give useful r~sults but we ha~e surpIisingly found that heat-forming of dense reconsti-tuted foam materials is possible in the substantial absence of air. It is not in all cases necessary to co~pletely enc?ose the material to be hot-formed; compression of sheet material between solid heating platens will often suffice~
~he platens exclude air from all but the peripheral edges of the sheet, while the high density of the starting material ~5 means that there is little air within the material~ Substan-tial amounts of entrappea air can hinder the transfer of heat and cause embrittlement of the product through oxidative decomposition.
During pressing th~ granular appearance of the material is lost ~nd any surface embossment on the heated pressure surfaces is i~pressed on the material and becomes a permanent feature o~ the product. An increase in density can also be observed.
DESCRI:~'rION O:F 5;~, ~1 ~:ltll:lLii'l ~ypical temperature and pressure conditions ~re about 210C and about 120 p.s~i. respectively. ~he time necessary - is of the order of a fe~ minutes, but varies with t-he thick-ness and density of ths starting material.
l~ZC)65 ~ioxe ~el~ally, the preferred tempe.rature range of the recon~.tituted foa~ material to be pressed is from 150 to 250C. lt hzs been found beneficial to pre-heat the material before p~essing si.~ce this makes possible greater throughput in the pressin~ stage. Preferred pre-heatin~; condltions c~e 1-5 minutes between i~fra-red radiators to a temperature of 150-250 and more especially 175 to 210C.
r~he preferred pressures employed i~ the pressing~ stage are in thè ran~e 5 to 30 tons/ft2, more especially from 10 to 25 tons/ft2. r~he dwell times of the foam material in -the press depend on the thickness of the starting material and on the type of emboss required~ Longer times are needed for deeply embossed surfaces as compared with smooth surfaces.
By way of exa~ple, the followin~ are typical pressing times for different thiclmesses of sheet:-For a deep embossO
2.5 mm thickness 2 minutes 2.8 mm " 2~ "
3.0 m~ " 3 "
3.5 mm " 3~ "
3.5 mm " 3~ "
4.0 mm " 4 For a polished surface:
2.5 mm thickness 1 minute 3 r 0 ~m " 2 "
r~he process of the inventlcn is preferablv applied to achieve products of final sheet thickness from 1~2 mm to 18 mm, although these limits are not critical~ r~he most ~ .
}?~fer~ r a~ ,e of I)roduct thicl~ess is fro~ to 8 ~m.
~he proces~ can be applied t,o any predo~linantly poly-ureth~ne recorletituted fo~ material of the requisi1;e de~sity whether of the polyether or polysster'type. ~e effect achieved is particularl~ surprisin~ with the polyether type because this t~pe of pol~rethane has a]ways been considered to be essentially on-thermoplastic c~nd inc~apable of any kind of thermo-for~ing.
~he process c~oes not depend on the use of any particvlar kind of pol~rethane bincler in the preparation of the reconsti-tuted starting material. ~olylene di-isocyanate cold curing systems, tolylene di-isoc~anate prepolyrner systems and methylene di-isocyc~ate systems have all been successfully employed.
A variety of additions can be included in the reconsti-tuted foe~ starting material to modify its properties and hence the properties of the compressed product. Such additions include flame-retardants, colorants, deodorants, fungicides and plasticisers. ~hese can,extend the range of application ' of the product and improve its performance.
~he invention a]so provides shoe soles formed of the - flexible sheet material defined above or movlded to shapesr Such soles may be embossed with pattern~, by using engra~ed or otherwise figured platens, and colouring or surface lacquers may also be applied.
Soling materials prepared in this wa~ show increased wear resistance, good flexibility and high slip re~istance ~hen worn.
Thc fol1oY~ing are e~nples of the pre,sent ~referred practice of this invention? in which al' quantities are given in part,s by weight unless the context indicates otherwise.
~ _e~ple I
1. l'roduction of ~rim~ sheet.
Polyether based pol~ure-thane foam was ground to a particle size of less than 2 mm ana then mi.xed with a binder to a for.~ul3.tion as follows:
- Grou~d pol~urethc~e 78.2 parts Prepolymer formulation10.2 Ethyl acetate 1~4 ~ctivator solution 10.2 '~he prepolymer formulation is made up typically as follows:
Polyether polyol, rJol.wt. 5000 100.0 parts Amine catal.yst (N,~1-dimethyl-phenethylamine) 0O3 ~olylene diisocyanete (~0/20) 40.6 --An.activator solution may be made up as follows:
Water 100 parts ine catalyst (as above) '.~he resulting mixture was charged into a mould and cured under pressure to yield a material of 60 lb/ft3 density~
~heets were then cut from this material in a suitable thicXness.
29 Heat ~`reatment of Sheet.
A sheet of materjal cut from a piece of reconstituted material ~repc,.red as outlined in (1) ~nd of ~ ~m thicl~ness was pu-t in a pres3 bet~7eeIl embossed heated platens and sub-jectecl. to a pressuxe of 120 p.s~i.
The temperature of the.platens wa,s 210~ and the pressure was maintained for 2 minutes.
After this time the sheet ~as removed and. cooled. It had no~ lost its granular nature and increased its density while taking up a permanent impre3sion of the embossin~
pattern.
Example II
The follo~Jing i.s a formulation includin~ colour and plasticiser which can be substituted for that in ¢xample I
a~d used to produce a reconstituted foam which can thereafter be pressed to lorm a densified product as described in that ~xampleO
Ground polyuretb.ane foam 76.1 parts Pigmented prepolymer composition 9.8 Solvent 6.5 Plasticiser (di~isodecyl phthalate) 7.6 ~xample III
The follo~ring are test results on a typical product of the invention, made by a process substantially identical with that of Examples I and.II.
1. Flex Test r~he resistance of the produ~t to damage by flexirg is tested by the Ross Flex '~est carrled out in accoraance ~7ith the st~dard ~AT~A 'l'est Method Prf60 (Shoe & Allied Trades Research Association.).
Q~;S
T~e t;est i s carried out at -5C c~nd for a material to pass i.t r,lust exhihit growth o~ a st~mdard cut not exceeding .5 mm.
~he p~oducts of this invention over a r~l~e of 2.5 to 3 ~m thickness showed cut growths of only 1.5 to 2.5 ~.
2 Miscellane~ roperties ~, _ Other physical properties for a material of 2~5 mm thic~ess were:
Densi'y 57 lb/ft3 q`ensile strength 4000 KPa ~lon~ation 70%
q'ear resistance 3 Kg/cm Hardness (Shore A) 60-80 Abrasion resistance (Weight loss after 1000 cycles in ~aber-~I22 test) 2-2.~/o : Cold flex at -~5C ~o cracking (after 18 hours exposure) - .
2.5 mm thickness 1 minute 3 r 0 ~m " 2 "
r~he process of the inventlcn is preferablv applied to achieve products of final sheet thickness from 1~2 mm to 18 mm, although these limits are not critical~ r~he most ~ .
}?~fer~ r a~ ,e of I)roduct thicl~ess is fro~ to 8 ~m.
~he proces~ can be applied t,o any predo~linantly poly-ureth~ne recorletituted fo~ material of the requisi1;e de~sity whether of the polyether or polysster'type. ~e effect achieved is particularl~ surprisin~ with the polyether type because this t~pe of pol~rethane has a]ways been considered to be essentially on-thermoplastic c~nd inc~apable of any kind of thermo-for~ing.
~he process c~oes not depend on the use of any particvlar kind of pol~rethane bincler in the preparation of the reconsti-tuted starting material. ~olylene di-isocyanate cold curing systems, tolylene di-isoc~anate prepolyrner systems and methylene di-isocyc~ate systems have all been successfully employed.
A variety of additions can be included in the reconsti-tuted foe~ starting material to modify its properties and hence the properties of the compressed product. Such additions include flame-retardants, colorants, deodorants, fungicides and plasticisers. ~hese can,extend the range of application ' of the product and improve its performance.
~he invention a]so provides shoe soles formed of the - flexible sheet material defined above or movlded to shapesr Such soles may be embossed with pattern~, by using engra~ed or otherwise figured platens, and colouring or surface lacquers may also be applied.
Soling materials prepared in this wa~ show increased wear resistance, good flexibility and high slip re~istance ~hen worn.
Thc fol1oY~ing are e~nples of the pre,sent ~referred practice of this invention? in which al' quantities are given in part,s by weight unless the context indicates otherwise.
~ _e~ple I
1. l'roduction of ~rim~ sheet.
Polyether based pol~ure-thane foam was ground to a particle size of less than 2 mm ana then mi.xed with a binder to a for.~ul3.tion as follows:
- Grou~d pol~urethc~e 78.2 parts Prepolymer formulation10.2 Ethyl acetate 1~4 ~ctivator solution 10.2 '~he prepolymer formulation is made up typically as follows:
Polyether polyol, rJol.wt. 5000 100.0 parts Amine catal.yst (N,~1-dimethyl-phenethylamine) 0O3 ~olylene diisocyanete (~0/20) 40.6 --An.activator solution may be made up as follows:
Water 100 parts ine catalyst (as above) '.~he resulting mixture was charged into a mould and cured under pressure to yield a material of 60 lb/ft3 density~
~heets were then cut from this material in a suitable thicXness.
29 Heat ~`reatment of Sheet.
A sheet of materjal cut from a piece of reconstituted material ~repc,.red as outlined in (1) ~nd of ~ ~m thicl~ness was pu-t in a pres3 bet~7eeIl embossed heated platens and sub-jectecl. to a pressuxe of 120 p.s~i.
The temperature of the.platens wa,s 210~ and the pressure was maintained for 2 minutes.
After this time the sheet ~as removed and. cooled. It had no~ lost its granular nature and increased its density while taking up a permanent impre3sion of the embossin~
pattern.
Example II
The follo~Jing i.s a formulation includin~ colour and plasticiser which can be substituted for that in ¢xample I
a~d used to produce a reconstituted foam which can thereafter be pressed to lorm a densified product as described in that ~xampleO
Ground polyuretb.ane foam 76.1 parts Pigmented prepolymer composition 9.8 Solvent 6.5 Plasticiser (di~isodecyl phthalate) 7.6 ~xample III
The follo~ring are test results on a typical product of the invention, made by a process substantially identical with that of Examples I and.II.
1. Flex Test r~he resistance of the produ~t to damage by flexirg is tested by the Ross Flex '~est carrled out in accoraance ~7ith the st~dard ~AT~A 'l'est Method Prf60 (Shoe & Allied Trades Research Association.).
Q~;S
T~e t;est i s carried out at -5C c~nd for a material to pass i.t r,lust exhihit growth o~ a st~mdard cut not exceeding .5 mm.
~he p~oducts of this invention over a r~l~e of 2.5 to 3 ~m thickness showed cut growths of only 1.5 to 2.5 ~.
2 Miscellane~ roperties ~, _ Other physical properties for a material of 2~5 mm thic~ess were:
Densi'y 57 lb/ft3 q`ensile strength 4000 KPa ~lon~ation 70%
q'ear resistance 3 Kg/cm Hardness (Shore A) 60-80 Abrasion resistance (Weight loss after 1000 cycles in ~aber-~I22 test) 2-2.~/o : Cold flex at -~5C ~o cracking (after 18 hours exposure) - .
Claims (8)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A process for making wear-resistant flexible sheet material comprising the steps of:
providing a sheet of dense flexible reconstituted poly-urethane foam material having a density exceeding about 15 lb/ft3;
and subjecting said sheet to pressure of about 5 to 30 tons/ft2 at a temperature above about 150°C in the substantial absence of air whereby said sheet is densified and its wear re-sistance enhanced.
providing a sheet of dense flexible reconstituted poly-urethane foam material having a density exceeding about 15 lb/ft3;
and subjecting said sheet to pressure of about 5 to 30 tons/ft2 at a temperature above about 150°C in the substantial absence of air whereby said sheet is densified and its wear re-sistance enhanced.
2. The process of claim 1 wherein said pressing is carried out at a temperature in the range of about 150 to 250°C.
3. The process of claim 1 wherein said sheet is preheated to a temperature in the range of about 150 to 250°C for a period of about 1 to about 5 minutes prior to pressing.
4. The process of claim 1 wherein said pressing is carried out for a period of 1 to 4 minutes depending on the thickness of said sheet.
5. The process of claim 1 wherein the polyurethane is of the polyether type.
6, A process for making wear-resistant flexible sheet material comprising the steps of:
providing a sheet of dense flexible reconstituted foam composed at least predominantly of polyurethane and having a density exceeding about 15 lb/ft3;
heating said sheet to a temperature in the range of about 150 to 250°C;
and compressing said sheet at said temperature between platens to the substantial exclusion of air under a pressure in the approximate range 5 to 30 tons/ft2 for a period of about 1 to about 4 minutes to a final sheet thickness in the approximate range of 1.2 to 18 mm.
providing a sheet of dense flexible reconstituted foam composed at least predominantly of polyurethane and having a density exceeding about 15 lb/ft3;
heating said sheet to a temperature in the range of about 150 to 250°C;
and compressing said sheet at said temperature between platens to the substantial exclusion of air under a pressure in the approximate range 5 to 30 tons/ft2 for a period of about 1 to about 4 minutes to a final sheet thickness in the approximate range of 1.2 to 18 mm.
7. The process of claim 6 wherein said sheet is heated to a temperature of 175 to 210°C over a period of 1 to 5 minutes prior to said pressing.
8. Wear-resistant flexible sheet material made by the process of claim 1.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB4282/77 | 1977-02-02 | ||
| GB4282/77A GB1595223A (en) | 1977-02-02 | 1977-02-02 | Flexible polyurethane sheet material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1102065A true CA1102065A (en) | 1981-06-02 |
Family
ID=9774194
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA295,042A Expired CA1102065A (en) | 1977-02-02 | 1978-01-16 | Flexible sheet material |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US4241189A (en) |
| AU (1) | AU3291178A (en) |
| CA (1) | CA1102065A (en) |
| DE (1) | DE2804489A1 (en) |
| FR (1) | FR2379368A1 (en) |
| GB (1) | GB1595223A (en) |
| IT (1) | IT1111443B (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2442642A1 (en) * | 1978-11-29 | 1980-06-27 | Recticel | PROCESS FOR THE REALIZATION OF A GYMNASTICS MAT CALLED "RECEPTION MAT" |
| US4438220A (en) * | 1981-06-18 | 1984-03-20 | Wm. T. Burnett & Co., Inc. | Polyurethane foam-filled foam resistant to combustion and method of producing same |
| US4396568A (en) * | 1981-07-17 | 1983-08-02 | Firma Carl Freudenberg | Method for the manufacture of a relief-like profiled outer sole of a cross-linked ethylene-co-vinyl acetate (EVA) foamed with closed cells |
| GB2116572B (en) * | 1982-03-05 | 1985-10-30 | Kun Huang Chang | High density flexible polyurethane foam |
| US4990396A (en) * | 1986-06-18 | 1991-02-05 | Dana Corporation | Gasket having multiple regions of different densities and thicknesses |
| US4810454A (en) * | 1986-06-18 | 1989-03-07 | Dana Corporation | Method of manufacturing a gasket having multiple regions of different densities and thicknesses |
| GB2240978A (en) * | 1990-02-01 | 1991-08-21 | Psychopax Limited | Improved packaging materials |
| US5273698A (en) * | 1992-05-28 | 1993-12-28 | Creme Art Corporation | Method for shaping cover materials |
| US5296182A (en) * | 1992-05-28 | 1994-03-22 | Creme Art Corporation | Method for making formed laminate |
| US5457139A (en) * | 1993-07-26 | 1995-10-10 | Monsanto Company | Flexible water-blown polyurethane foams |
| US6623676B1 (en) | 1999-07-14 | 2003-09-23 | Wm. T. Burnett & Co. | Process for forming a continuous web from polyurethane foam pieces |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL113523C (en) * | 1955-02-03 | 1900-01-01 | ||
| US3035280A (en) * | 1956-08-16 | 1962-05-22 | Agricola Reg Trust | Method of working expanded plastic and articles made by the method |
| US2994110A (en) * | 1957-05-10 | 1961-08-01 | Mobay Chemical Corp | Surfacing process for isocyanate foam and product |
| US3004293A (en) * | 1959-09-15 | 1961-10-17 | Werner H Kreidl | Method of treating a foamy material having a high water content and product obtained thereby |
| GB976260A (en) * | 1962-09-18 | 1964-11-25 | Gen Foam Products | Improvements relating to the moulding of articles of foam material |
| NL297232A (en) * | 1962-10-31 | 1900-01-01 | ||
| US3354578A (en) * | 1964-07-24 | 1967-11-28 | Mattel Inc | Figure toy having compressed elastomeric stuffing and bonded cover |
| GB1134751A (en) * | 1965-01-22 | 1968-11-27 | Gen Foam Products | Improvements relating to foamed materials |
| US3452127A (en) * | 1965-12-28 | 1969-06-24 | Henry H Lovette | Method of making an innerspring body supporting article |
| DE6750189U (en) * | 1968-03-01 | 1969-01-02 | Rudolph Koepp & Co Chem Fab Ag | PRESSED FORMED PARTS ON A POLYURETHANE BASE. |
| GB1337413A (en) * | 1970-04-10 | 1973-11-14 | Gen Foam Products | Flexible moulded product |
| US3746610A (en) * | 1971-01-29 | 1973-07-17 | Du Pont | Composite boards prepared from foam sheeting |
-
1977
- 1977-02-02 GB GB4282/77A patent/GB1595223A/en not_active Expired
-
1978
- 1978-01-16 CA CA295,042A patent/CA1102065A/en not_active Expired
- 1978-01-31 FR FR7802608A patent/FR2379368A1/en not_active Withdrawn
- 1978-02-01 AU AU32911/78A patent/AU3291178A/en active Pending
- 1978-02-01 IT IT67189/78A patent/IT1111443B/en active
- 1978-02-02 DE DE19782804489 patent/DE2804489A1/en not_active Withdrawn
- 1978-02-02 US US05/874,390 patent/US4241189A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| IT1111443B (en) | 1986-01-13 |
| US4241189A (en) | 1980-12-23 |
| AU3291178A (en) | 1979-08-09 |
| FR2379368A1 (en) | 1978-09-01 |
| DE2804489A1 (en) | 1978-08-03 |
| GB1595223A (en) | 1981-08-12 |
| IT7867189A0 (en) | 1978-02-01 |
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| Date | Code | Title | Description |
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| MKEX | Expiry |