Coating compositions based on aldimines and polyisocyanates containing uretdione groups
US5523376A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 21, 1994 |
| Grant date | Jun 4, 1996 |
| Priority date | — |
| Expiry date | Dec 21, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G18/798
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention is directed to coating compositions which have long pot lives and may be rapidly cured under ambient conditions to provide coatings with improved optical properties and resistance to yellowing, such coating compositions containing as binder PA0 a) a polyisocyanate component containing PA1 i) 5 to 100% by weight of a polyisocyanate adduct containing uretdione groups and PA1 ii) 0 to 95% by weight of a monomeric polyisocyanate, an NCO prepolymer or a polyisocyanate adduct other than i), and PA0 b) an aldimine based on the reaction product of a polyamine having 2 or more primary amino groups with an aldehyde corresponding to the formula: EQU O.dbd.CHCH(R.sub.1)(R.sub.2) PA1 wherein R.sub.1 and R.sub.2 may be the same or different and represent optionally substituted hydrocarbon radicals, or R.sub.1 and R.sub.2 together with the .beta.-carbon atom form a cycloaliphatic or heterocyclic ring, PA0 wherein components a) and b) are present in an amount sufficient to provide an equivalent ratio of isocyanate groups to aldimine groups of 0.5:1 to 20:1.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.