Isocyanate-terminated prepolymers and rigid-foams produced therefrom
US5962541A · kind A · utility
28Cited by
2References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 10, 1998 |
| Grant date | Oct 5, 1999 |
| Priority date | — |
| Expiry date | Jun 10, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2375/04
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
NCO-terminated prepolymers are made by reacting a polymeric diphenylmethane diisocyanate (PMDI) and a polyol having a functionality of from about 1.8 to about 4.0 and a molecular weight of from about 400 to about 2,000. The PMDI and polyol are reacted in amounts such that the equivalent ratio of isocyanate groups to hydroxyl groups is from about 15:1 to about 160:1. These prepolymers are useful in the production of polyurethane foams, particularly laminated foams.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.