US3922402A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of artificial leather
Assignee: Kuraray Co Ltd
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Filing: 1974-03-29
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Granted: 1975-11-25
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Expires: 1994-03-29
Abstract
Abstract A method for preparing artificial leathers having different polyurethane elastomers in the surface layer and in the substrate is disclosed. In one embodiment, the method involves the application of an intermediate layer containing both elastomers. In another embodiment, the method involves the application of an intermediate layer containing either both elastomers or the surface elastomer only; this embodiment involves an additional drying step prior to application of the surface layer.
Inventors
- 👤 Hidehiko Shimamura
- 👤 Hirozo Fujita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:33
CPC Classifications
D; D06; D06N; D06N3/00; D06N3/12; D06N3/14; D06N3/145; D04; D04H; D04H1/00; D04H1/40; D04H1/58; D04H1/587; D04H1/64; Y; Y10; Y10S; Y10S428/00; Y10S428/904; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31554; Y10T442/00; Y10T442/20; Y10T442/2311; Y10T442/2336
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
121 words
A METHOD OF PREPARING AN ARTIFICIAL LEATHER WHICH COMPRISES A SUBSTRATE CONTAINING AS AN A-POLYMER A POLYURETHANE ELASTOMER AND A SURFACE LAYER CONTAINING AS A B-POLYMER A POLYURETHANE ELASTOMER DIFFERENT FROM THE A-POLYMER, SAID METHOD COMPRISING THE STEPS OF (1) IMPREGNATING A SOLUTION OR LIQUID DISPERSION CONTAINING THE A-POLYMER IN A FIBROUS MAT, TO GIVE AN A-POLYMER IMPREGNATED MAT, (2) COATING THE IMPREGNATED MAT WITH A SOLUTION OR LIQUID DISPERSION CONTAINING A COMPOSITION COMPRISING THE A-POLYMER AND THE B-POLYMER IN A RATIO OF FROM ABOUT 65:35 TO ABOUT 9:98, (3) APPLYING A SURFACE LAYER BY COATING THE COATED IMPREGNATED MAT WITH A SOLUTION OR LIQUID DISPERSION CONTAINING THE B-POLYMER, AND (4) COAGULATING THE RESULTING COATED IMPREGNATED MAT PRODUCED IN STEP (3).
Claim 2
Independent Claim
121 words
A METHOD OF PREPARING AN ARTIFICIAL LEATHER WHICH COMPRISES A SUBSTRATE CONTAINING AS AN A-POLYMER A POLYURETHANE ELASTOMER AND A SURFACE LAYER CONTAINING AS A B-POLYMER A POLYURETHANE ELASTOMER DIFFERENT FROM THE A-POLYMER, SAID METHOD COMPRISING THE STEPS OF (1) IMPREGNATING A SOLUTION OR LIQUID DISPERSION CONTAINING THE A-POLYMER IN A FIBROUS MAT, TO GIVE AN A-POLYMER IMPREGNATED MAT, (2) COATING THE IMPREGNATED MAT WITH A SOLUTION OR LIQUID DISPERSION CONTAINING A COMPOSITION COMPRISING THE A-POLYMER AND THE B-POLYMER IN A RATIO OF FROM ABOUT 65:35 TO ABOUT 9:98, (3) APPLYING A SURFACE LAYER BY COATING THE COATED IMPREGNATED MAT WITH A SOLUTION OR LIQUID DISPERSION CONTAINING THE B-POLYMER, AND (4) COAGULATING THE RESULTING COATED IMPREGNATED MAT PRODUCED IN STEP (3).
Claim 3
Dependent Claim
40 words
A method according to claim 1 in which, in step 2, the polymer composition is supplied in sufficient amount so that from about 2 to about 110 grams of polyurethane elastomer are deposited per square meter of the surface area.
Claim 4
Dependent Claim
26 words
A method according to claim 2 in which from about 8 to about 60 grams of polyurethane elastomer are deposited per square meter of surface area.
Claim 5
Dependent Claim
30 words
A method according to claim 1 in which, in step 2, the total concentration of polymer in the solution or dispersion liquid is from about 5 to 30 weight percent.
Claim 6
Dependent Claim
37 words
A method according to claim 1 in which the substrate and surface layers each contain at most 50% of another and different polymer, said other and different polymer having an affinity for said A-polymer and said B-polymer.
Claim 7
Independent Claim
136 words
A method of preparing an artificial leather which comprises a substrate containing as an A-polymer a polyurethane elastomer and a surface layer containing as a B-polymer a polyurethane elastomer different from the A-polymer, said method comprising the steps of (1) impregnating a solution or liquid dispersion containing the A-polymer in a fibrous mat, to give an A-polymer impregnated mat, (2) coagulating the impregnated mat, (3) coating the impregnated mat with a solution or liquid dispersion containing either a composition comprising the A-polymer and B-polymer in a ratio of from about 65:35 to about 2:98, or the B-polymer alone, (4) drying the coated impregnated mat, (5) applying a surface layer by coating the coated impregnated mat with a solution or liquid dispersion containing the B-ploymer and, (6) coagulating the resulting coated impregnated mat produced in step (3).
Claim 8
Independent Claim
136 words
A method of preparing an artificial leather which comprises a substrate containing as an A-polymer a polyurethane elastomer and a surface layer containing as a B-polymer a polyurethane elastomer different from the A-polymer, said method comprising the steps of (1) impregnating a solution or liquid dispersion containing the A-polymer in a fibrous mat, to give an A-polymer impregnated mat, (2) coagulating the impregnated mat, (3) coating the impregnated mat with a solution or liquid dispersion containing either a composition comprising the A-polymer and B-polymer in a ratio of from about 65:35 to about 2:98, or the B-polymer alone, (4) drying the coated impregnated mat, (5) applying a surface layer by coating the coated impregnated mat with a solution or liquid dispersion containing the B-ploymer and, (6) coagulating the resulting coated impregnated mat produced in step (3).
Claim 9
Dependent Claim
26 words
A method according to claim 6 in which, in step 2, the impregnated mat is dried sufficiently so that more than 80% of solvent is removed.
Claim 10
Dependent Claim
37 words
A method according to claim 6 in which, in step 3, sufficient polyurethane elastomer is used so as to provide a coating layer of from about 0.1 to about 30 grams per square meter of surface area.
Claim 11
Dependent Claim
30 words
A method according to claim 8 in which sufficient polyurethane elastomer is used so as to provide between about 0.5 and about 15 grams per square meter of surface area.
Claim 12
Dependent Claim
32 words
A method according to claim 6 in which, in step 3, the concentration of polyurethane elastomer in the solution or dispersion liquid is from about 5 weight percent to 30 weight percent.
Claim 13
Dependent Claim
37 words
A method according to claim 6 in which the substrate and surface layers each contain at most 50% of another and different polymer, said other and different polymer having an affinity for said A-polymer and said B-polymer.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-24 | 1979-05-26 | 1979-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-24 | 1983-05-26 | 1983-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-24 | 1987-05-26 | 1987-11-25 | $7700.00 | Window Closed / Lapsed |