Method for preparing urethane-modified isocyanurate foams
US4173692A · kind A · utility
1Cited by
2References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 25, 1978 |
| Grant date | Nov 6, 1979 |
| Priority date | — |
| Expiry date | Oct 25, 1998 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G18/791
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The friability exhibited by urethane-modified isocyanurate foams prepared by reacting a polyfunctional isocyanate with a polyol at a ratio of isocyanate equivalents to moles of active hydrogen greater than 6:1 is reduced to an acceptable level using alkali metal salts in combination with certain organotin compounds or stannous salts as the catalyst.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.