Storage stable polyisocyanates characterized by allophanate linkages
US4738991A · kind A · utility
42Cited by
3References
6Claims
0Family size
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Key dates
| Filing date | Jan 23, 1987 |
| Grant date | Apr 19, 1988 |
| Priority date | — |
| Expiry date | Jan 23, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C273/1809
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Organic polyisocyanates characterized by allophanate linkages are prepared by reacting an organic polyisocyanate with a mono- or polyhydric compound in the presence of an organo metal catalyst. The catalyst is then deactivated using a compound such as an inorganic acid, organic acid, organic chloroformate or an organic acid chloride. The isocyanates are useful in preparing polyurethane foams.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.