US4363686A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of imitation suedes by the reversal process
Assignee: Bayer AG
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Filing: 1981-01-30
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Granted: 1982-12-14
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Expires: 2001-01-30
Abstract
Abstract Process for the production of sheet products having a suede-like surface by application of a coating paste to a matrix whose surface has the structure of a negative of suede or suede-like materials, solidification of the coating by heating, stripping of the solidified coating from the matrix and, optionally, laminating it to a textile material, characterized in that: (a) a coating paste of a two-component system which does not harden to a polyurethane urea until heated, which system is based either on a blocked isocyanate prepolymer and a polyamine or on an isocyanate prepolymer and a complex of an alkali metal halide and an aromatic polyamine and, optionally, up to about 40% by weight, preferably less than about 30% by weight, more preferably less than about 25% by weight, and most preferably less than about 15% by weight, of solvent, so that the coating paste has a viscosity of at the most about 100,000 mPa.s at room temperature, is applied; (b) the coating is heated to a temperature of from about 30° to 80° C., the viscosity of the coating paste passing through a minimum which is at the most about 30,000 mPa.s; and (c) the coating is hardened to the polyurethane urea by heating to a temperature above about 90° C.
Inventors
- 👤 Ernst Komarek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:05
CPC Classifications
D; D06; D06N; D06N3/00; D06N3/12; D06N3/14; B; B29; B29C; B29C43/00; B29C43/22; B29C43/222; B29C59/00; B29C59/02; B29C59/022; B29C59/025; C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; Y; Y10; Y10T; Y10T428/00; Y10T428/23907; Y10T428/23914; Y10T428/23986; Y10T428/23993
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
169 words
A process for the production of sheet products having a suede-like surface by applying a coating paste to a matrix whose surface has the form of a negative of suede or suede-like materials, solidifying the coating by heating, and removing the solidified coating from the matrix, comprising: (a) applying a coating paste of a two-component system which may be hardened to a polyurethane urea only when heated and which is based on (1) a blocked isocyanate prepolymer and a polyamine or (2) an isocyanate prepolymer and a complex of an alkali metal halide and an aromatic polyamine and up to about 40% by weight of solvent so that the coating paste has a viscosity of at most about 100,000 mPa.s at room temperature; (b) heating the coating to a temperature of from 30° to 80° C., the viscosity of the coating paste passing through a minimum which is at the most 30,000 mPa.s; and (c) hardening the coating to the polyurethane by heating to a temperature above 90° C.
Claim 2
Dependent Claim
169 words
A process for the production of sheet products having a suede-like surface by applying a coating paste to a matrix whose surface has the form of a negative of suede or suede-like materials, solidifying the coating by heating, and removing the solidified coating from the matrix, comprising: (a) applying a coating paste of a two-component system which may be hardened to a polyurethane urea only when heated and which is based on (1) a blocked isocyanate prepolymer and a polyamine or (2) an isocyanate prepolymer and a complex of an alkali metal halide and an aromatic polyamine and up to about 40% by weight of solvent so that the coating paste has a viscosity of at most about 100,000 mPa.s at room temperature; (b) heating the coating to a temperature of from 30° to 80° C., the viscosity of the coating paste passing through a minimum which is at the most 30,000 mPa.s; and (c) hardening the coating to the polyurethane by heating to a temperature above 90° C.
Claim 3
Dependent Claim
115 words
A process according to claim 1, characterized in that the coating paste comprises: (a) a prepolymer having an average molecular weight of from about 1,000 to 15,000 having an average of from about 2 to 4 ketoxime-blocked aromatic isocyanate groups; and (b) a cross-linking agent corresponding to the following general formula: ##STR2## wherein R 1 , R 2 , R 3 and R 4 independently represent hydrogen or a C 1 -C 3 alkyl group, provided that at least about 75% of the diamine consists of the cis, cis-isomer when R 1 to R 4 all represent hydrogen; the equivalent ratio of blocked isocyanate groups to NH 2 groups being from about 1.35:1 to 0.95:1.
Claim 4
Dependent Claim
60 words
The process according to claim 2, characterized in that component (a) has been prepared from a polyether having a molecular weight of from about 500 to 10,000 having an average of from 2 to 3 hydroxyl groups and/or a polyester having a molecular weight of from about 1,000 to 6,000 having an average of from 2 to 3 hydroxyl groups.
Claim 5
Dependent Claim
19 words
The process according to claim 2 or 3, characterized in that the compound used as component (b) is 4,4'-diamino-3,3'-dimethyldicyclohexylmethane.
Claim 6
Dependent Claim
16 words
The process according to claim 2 or 3, characterized in that silicone oils are additionally added.
Claim 7
Dependent Claim
23 words
The process according to claim 2 or 3, characterized in that the coating paste contains up to about 30% by weight of solvent.
Claim 8
Dependent Claim
18 words
The process according to claim 2 or 3 which comprises laminating the solidified coating to a textile substrate.
Claim 9
Dependent Claim
24 words
The process according to claim 2 or 3 which comprises adding a member selected from the group consisting of pigments, fillers and blowing agents.
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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) | 1985-12-13 | 1986-06-14 | 1986-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-13 | 1990-06-14 | 1990-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-13 | 1994-06-14 | 1994-12-14 | $7700.00 | Window Closed / Lapsed |