Epoxy/nucleophile transesterification catalysts and thermoset coatings
US4749728A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 6, 1986 |
| Grant date | Jun 7, 1988 |
| Priority date | — |
| Expiry date | Jun 6, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09D201/06
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A new transesterification catalyst comprises an epoxide and a non-acidic nucleophilic onium salt. Coating compositions having hydroxyl functional resin components and carboxylic ester components adapted for curing by transesterification following application to a substrate are formulated with in-situ formed cure catalyst comprising a non-acidic nucleophile and an epoxide-to-product coatings that readily cure by transesterification. Such coatings including polyesters, polyepoxides, and polyacrylates are useful in formulating high solids coatings and powder coatings having exceptional physical properties. Extremely low-temperature cure coatings were obtained by transesterifying mixtures of polyols and polymeric esters having multiple activated ester linkages having the structure ##STR1## wherein R' is lower alkyl and Y is --OH and O-alkyl radicals. These coatings provide low-temperature cure coatings for paper, plastic, and wood in addition to metal substrates.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.