Catalytic cyclotrimerization of polyisocyanates
US4537961A · kind A · utility
22Cited by
3References
11Claims
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Key dates
| Filing date | Mar 1, 1983 |
| Grant date | Aug 27, 1985 |
| Priority date | — |
| Expiry date | Mar 1, 2003 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S521/902
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Polyisocyanato-polyisocyanurates are prepared by catalytically cyclotrimerizing a polyisocyanate in the presence of a catalytically effective amount of an aminosilyl catalyst, and which is characterizing by terminating the cyclotrimerization reaction when a predetermined desired amount of isocyanurate groups has been obtained, by adding to the reaction mixture a reaction terminating amount of an organic catalyst deactivating compound comprising at least one free hydroxyl moiety, or the reaction product of such hydroxylated organic catalyst deactivating compound with an isocyanate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.