Polyisocyanate mixtures and their use in the preparation of flexible polyurethane foams
US5132334A · kind A · utility
Inventors
Key dates
| Filing date | Jan 8, 1991 |
| Grant date | Jul 21, 1992 |
| Priority date | — |
| Expiry date | Jan 8, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G2110/0083
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention relates to polyisocyanate mixtures of PA1 (A) 21 to 95% by weight of toluene diisocyanate and PA1 (B) 5 to 79% by weight of a mixture of diphenylmethane diisocyanates and polyphenyl polymethylene polyisocyanates containing (1) 55 to 87% by weight of 4,4'-diphenylmethane diisocyanate, (2) 8 to 30% by weight of 2,4'-diphenylmethane diisocyanate, (3) 0 to 4% by weight of 2,2'-diphenylmethane diisocyanate, and (4) 5 to 35% by weight of polyphenyl polymethylene polyisocyanates. The invention also relates to a process for preparing flexible polyurethane foams in which polyisocyanate mixtures of the invention are used as the polyisocyanate component.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.