Carbodiimide-isocyanurate foams containing urethane linkages
US4029610A · kind A · utility
5Cited by
8References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 9, 1975 |
| Grant date | Jun 14, 1977 |
| Priority date | — |
| Expiry date | Apr 9, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S521/902
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Cellular foam compositions are prepared by catalytically condensing an organic polyisocyanate in the presence of a blowing agent, from 0.01 to 0.5 equivalent per equivalent of isocyanate of a primary hydroxy-terminated polyoxyalkylene or polyester polyol and a catalyst system comprising (a) methanol, (b) a tertiary amine trimerization catalyst, and (c) a urethane catalyst. The resulting foam compositions are characterized by carbodiimide, isocyanurate and urethane linkages and exhibit unexpectedly low friability, improved strength properties, and good flame retardancy.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.