Isocyanate polymerization catalyst, preparation method thereof, and method for preparing polyisocyanate by using same
US11111332B2 · kind B2 · utility
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20Claims
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Key dates
| Filing date | Aug 16, 2016 |
| Grant date | Sep 7, 2021 |
| Priority date | — |
| Expiry date | Jun 15, 2037 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G18/755
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
An isocyanate polymerization catalyst, a preparation method thereof and a method for preparing polyisocyanates comprising isocyanurate groups by using the same. The catalyst is a carboxylic acid salt containing a di-quaternary ammonium ion. The structure of the catalyst contains hydroxyl-containing aromatic heterocyclic residues. The catalyst is highly active. Only a small quantity of the catalyst is required for the polymerization of isocyanates. The prepared polyisocyanates have color values lower than 25 Hazen, monomer contents of less than 0.5% by weight, high contents of isocyanurates and low viscosities.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.