Polyisocyanates containing allophanate and isocyanurate groups, a process for their production and their use in two-component coating compositions
US5235018A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 6, 1992 |
| Grant date | Aug 10, 1993 |
| Priority date | — |
| Expiry date | May 6, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G18/792
- 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 a monoalcohol containing at least 10 carbon atoms and having a molecular weight of 158 to 2500. 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 10:1 to 1:5 by PA0 a) catalytically trimerizing a portion of the isocyanate groups of an organic diisocyanate having (cyclo)aliphatically bound isocyanate groups PA0 b) adding 0.001 to 0.5 moles, per mole of organic diisocyanate, of a monoalcohol containing at least 10 carbon atoms and having a molecular weight of 158 to 2500 to the organic dii…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.