Process for preparing polyisocyanato/polyisocyanurates by catalytic cyclotrimerization of polyisocyanates
US4675401A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 30, 1985 |
| Grant date | Jun 23, 1987 |
| Priority date | — |
| Expiry date | Oct 30, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S521/902
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Polyisocyanurate/polyisocyanates of enhanced stability are prepared by partial catalytic cyclotrimerization of a polyisocyanate in the presence of a catalytically effective amount of an aminosilyl catalyst and wherein the cyclotrimerization reaction is terminated when a predetermined desired amount of isocyanurate groups has been attained, by adding to the reaction mixture, after the cooling thereof to a temperature of below 50.degree. C., 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.