Low density microcellular elastomers based on isocyanate-terminated prepolymers
US6395798B1 · kind B1 · utility
6Cited by
11References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 21, 1995 |
| Grant date | May 28, 2002 |
| Priority date | — |
| Expiry date | Sep 29, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G2410/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Low density microcellular polyurethane foams suitable for athletic shoe midsoles and other applications are prepared by diol chain extension of 12 to 16% free NCO isocyanate-terminated prepolymers prepared by reacting an excess of di- or polyisocyanate with one or more high molecular weight, high functionality polyoxypropylene diols preferably employing water as a reactive blowing agent. The microcellular elastomers exhibit increased hardness despite the higher molecular weight of the polyoxypropylene diol and further exhibit greater tear resistance, lower compression set, and markedly lower shrinkage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.