Polyurethane dispersion and emulsion, sheet-like porous material and production process thereof
US4746684A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | May 13, 1987 |
| Grant date | May 24, 1988 |
| Priority date | — |
| Expiry date | May 13, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2375/04
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A polyurethane dispersion contains (A) an organic solvent, (B) a polyurethane resin having a molecular weight of 20,000-500,000, and (C) fine particles obtained from an active-hydrogen containing polyfunctional compound, which contains functional groups having a molecular weight of 50 or smaller per functional group, and an organic polyisocyanate. The dispersion can be converted into an emulsion by emulsifying water therein. A sheet-like porous material is also obtained by impregnating and/or coating a base material with the emulsion, causing the thus-coated emulsion to gel and then drying the resultant base material. The dispersion has excellent stability. The emulsion can be gelatinized at a relatively high temperature in a rather short period time, thereby permitting efficient production of the sheet-like porous material. The sheet-like material has a very fine porous structure, is excellent in various properties and has superb water vapor transmission characteristics. It is useful as a raw material for various synthetic hides, namely, for clothing, shoes, waterproof cloths, tents, wall paper, flooring, filter media, filters for air conditioners, etc.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.