Polyisocyanates containing allophanate and isocyanurate groups, a process for their production from cyclic diisocyanates and their use in two-component coating compositions
US5290902A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 22, 1993 |
| Grant date | Mar 1, 1994 |
| Priority date | — |
| Expiry date | Jun 22, 2013 |
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 which PA0 i) has an NCO content of 5 to 47% by weight, PA0 ii) is prepared from an isocyanate component substantially containing one or more cyclic organic diisocyanates having (cyclo)aliphatically-bound isocyanate groups and PA0 iii) contains isocyanurate and allophanate groups in a molar ratio of monolsocyanurates to monoallophanates of 10:1 to 1:10, wherein the allophanate groups are formed from urethane groups which are based on the reaction product of an organic diisocyanate having (cyclo)aliphatically bound isocyanate groups and a monoalcohol containing at least 1 carbon atom and having a molecular weight of up to 2500. The present invention is also directed to a process for the production of these polyisocyan mixtures and to their use, optionally in blocked form, as an isocyanate component in two-component coating compositions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.