Urethane modified carbodimide-isocyanurate foams from organic polyisocyanates and oxyalkylated mannich polyols
US3998766A · kind A · utility
7Cited by
6References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 26, 1974 |
| Grant date | Dec 21, 1976 |
| Priority date | — |
| Expiry date | Dec 26, 1994 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S521/902
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Rigid cellular foam compositions characterized by carbodiimide, isocyanurate and urethane linkages are prepared by the reaction of an organic polyisocyanate with certain oxyalkylated Mannich polyols employing an NCO/OH equivalent ratio of from about 2:1 to 10:1. The use of the oxyalkylated Mannich polyols in the amounts stated eliminates the need for carbodiimide and isocyanurate promoting catalysts.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.