Coating compositions based on aldimines and polyisocyanates containing allophanate groups
US5466771A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 21, 1993 |
| Grant date | Nov 14, 1995 |
| Priority date | — |
| Expiry date | Dec 21, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31594
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention is directed to coating compositions which have long pot lives, may be rapidly cured under ambient conditions to provide coatings with improved optical properties and contain as binder PA0 a) a polyisocyanate component containing PA1 i) 5 to 100 % by weight of a monoallophanate and PA1 ii) 0 to 95% by weight of another polyisocyanate adduct, 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) PA0 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, 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.