High viscosity, high equivalent weight polyisocyanate mixtures containing allophanate and isocyanurate groups and their use in coating compositions
US5789519A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 12, 1996 |
| Grant date | Aug 4, 1998 |
| Priority date | — |
| Expiry date | Apr 12, 2016 |
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) is prepared from a monomeric starting material containing a) 95 to 100% by weight, based on the weight of a) and b), of an aliphatic diisocyanate having 4 to 18 carbons in the hydrocarbon chain and b) 0 to 5% by weight, based on the weight of a) and b), of a diisocyanate other component a), PA0 ii) has an equivalent weight that is at least 30% greater than the average molecular weight of the monomeric starting material and a viscosity of greater than 10,000 to 100,000 mPa.s when determined at 25.degree. C. on a sample having a solids content of 100% and containing less than 2% by weight of unreacted diisocyanates a) and b), and PA0 iii) contains isocyanurate groups and allophanate groups in a molar ratio of 10:1 to 1:10, wherein the allophanate groups are derived from urethane groups that are the reaction product of starting material i) with 0.01 to 0.6 moles, per mole of starting material i), of a monoalcohol having a molecular weight of up to 2500. The present invention also relates to the use of these polyisocyanate mixtures, optionally in blocked form, as an isocyanate component in one- or two-component …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.