Allophanate group-containing polyisocyanates improved compatibility with aldimines
US5859163A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 22, 1997 |
| Grant date | Jan 12, 1999 |
| Priority date | — |
| Expiry date | Aug 22, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09D175/02
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention relates to coating compositions containing PA0 a) aldimines and PA0 b) polyisocyanates which PA1 i) contain 2 to 35% by weight of allophanate groups, based on the weight of the polyisocyanates, PA1 ii) have a viscosity of less than 3000 mpa.s at 25.degree. C. when measured at a solids content of 100%, PA1 iii) are based on the reaction products of aliphatic polyisocyanates with PA2 1) 10 to 90 mole percent of monohydroxy compounds and PA2 2) 10 to 90 mole percent of polyhydric alcohols, wherein the mole percentages of 1) and 2) add up to 100, and the percentages are based on the total moles of monohydroxy compounds 1) and polyhydric alcohols 2) and PA1 iv) contain less than 10 mole percent of urethane groups, based on the total moles of urethane groups obtained from monohydroxy compounds 1) and polyhydric alcohols 2). The present invention also relates to these polyisocyanates containing allophanate groups and to polyisocyanate mixtures containing these polyisocyanates and polyisocyanate adducts containing isocyanurate, uretdione, biuret and/or urethane groups.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.