Surface treatment of microporous material
US3931437A · kind A · utility
3Cited by
17References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 27, 1973 |
| Grant date | Jan 6, 1976 |
| Priority date | — |
| Expiry date | Sep 27, 1993 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2375/04
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A sheet material having a microporous surface of elastomeric polyurethane is treated to produce a sheet, which has greater water-proofness and still transmits water vapor, by applying to it a coagulated layer of elastomeric polyurethane. Preferably the coagulated layer is produced by applying a pigmented polyurethane solution to the sheet while it is wet with a non-solvent. The coagulated layer may then be treated in various ways; e.g. it may be embossed or treated with a solvent to form a fused glossy moisture vapor-transmitting surface. The product is suitable for use as a leather substitute in shoe uppers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.