Polyisocyanates containing allophanate and isocyanurate groups, a process for their production and their use in two-component coating compositions
US5444146A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 13, 1993 |
| Grant date | Aug 22, 1995 |
| Priority date | — |
| Expiry date | Jan 13, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G18/8064
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention is directed to a polyisocyanate mixture having an NCO content of 10 to 47% by weight and a viscosity of less than 10,000 mPa.s and containing isocyanurate and allophanate groups in a molar ratio of monoisocyanurates to monoallophanates of 10:1 to 1:5, wherein the allophanate groups are formed from urethane groups which are based on the reaction product of an organic diisocyanate having (cyclo)aliphatic bound isocyanate groups and an aromatic monoalcohol containing 6 to 9 carbon atoms. The present invention is also directed to a process for the production of a polyisocyanate mixture having an NCO content of 10 to 47% by weight, having a viscosity of less than 10,000 mPa.s and containing isocyanurate and allophanate groups in a molar ratio of monoisocyanurates to monoallophanates of 0:1 to 1:5 by PA1 a) catalytically trimerizing a portion of the isocyanate groups of an organic diisocyanate having (cyclo)aliphatically bound isocyanate groups PA1 b) adding 0.01 to 0.5 moles, per mole of organic diisocyanate, of an aromatic monoalcohol containing 6 to 9 carbon atoms to the organic diisocyanate prior to or during the trimerization reaction of step a) and PA1 c) term…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.