Catalyst and method for trimerization of isocyanates
US6635761B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 15, 2000 |
| Grant date | Oct 21, 2003 |
| Priority date | — |
| Expiry date | Jun 15, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G2115/02
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
This invention relates to the use as catalyst for the cyclotrimerization reaction of isocyanates of a hydrogencarbonate of a cation which either as it is or in the form complexed with a complexing agent has an average molecular or ionic radius of more than 1 å, preferably greater than 1.5 å, and which is at least partially soluble in the reaction medium.The invention also relates to a method of preparing (poly)isocyanurate polyisocyanates by catalytic cyclotrimerization of isocyanates, in which a catalytic system is used which comprises a cyclotrimerization catalyst based on a quaternary ammonium salt as catalyst and imidazole as cocatalyst.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.