Catalyst-reactant systems for the preparation of carbodiimide foams
US3933699A · kind A · utility
4Cited by
4References
12Claims
0Family size
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Inventors
Key dates
| Filing date | Oct 2, 1974 |
| Grant date | Jan 20, 1976 |
| Priority date | — |
| Expiry date | Oct 2, 1994 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S521/901
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Rigid cellular foams characterized by carbodiimide linkages are prepared by the catalytic condensation of an organic polyisocyanate in the presence of a catalytically sufficient amount of a carbodiimide catalyst and an exotherm generating reactant which is either (a) an oxazolidine or (b) an enamine. The foams hereof are characterized by excellent flame retardancy, weight retention and low friability.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.