Isocyanurate preparation by catalytic, aminosilyl initiated cyclotrimerization of isocyanates
US4412073A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 1, 1982 |
| Grant date | Oct 25, 1983 |
| Priority date | — |
| Expiry date | Feb 1, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S521/902
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Monomeric or polymeric isocyanurates, e.g., polyisocyanate/polyisocyanurates, are prepared by catalytically cyclotrimerizing an isocyanate, e.g., an aliphatic or cycloaliphatic isocyanate, in the presence of an aminosilyl catalysis initiator, e.g., a mono- or diaminosilane, a silylurea or a silazane, having the structural formula: EQU R.sub.(4-n) Si--NR'R"].sub.n (I) wherein R is a saturated or unsaturated, aliphatic, cycloaliphatic, aryl, aralkyl or alkylaryl monovalent hydrocarbon radical, or halo or cyano substituted such radical, and further wherein any two radicals R may together form a single divalent such hydrocarbon radical; R' is R, SiR.sub.3 or an amido radical having the structural formula: ##STR1## wherein R'" is R or SiR.sub.3, with R being as above defined, and further wherein R', when R' is neither the amido radical nor SiR.sub.3, may, together with the radical R", form a single divalent such radical; R" is R, or a hydrogen atom when R' is not the amido radical; and n is either 1 or 2, but when n is 2, R' is R.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.