Process of reacting isocyanates with active hydrogen containing compounds using sulfonium zwitterions as initiators
US4220728A · kind A · utility
4Cited by
3References
23Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 27, 1978 |
| Grant date | Sep 2, 1980 |
| Priority date | — |
| Expiry date | Mar 27, 1998 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G2115/02
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The reaction of isocyanates with substances containing isocyanate groups or active hydrogen groups, such as hydroxyl groups, amino groups and the like, are initiated by sulfonium zwitterions such as the ar-cyclic sulfonium areneoxides. Accordingly, partially trimerized isocyanates, polyurethanes and other useful materials can be made.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.