Hardeners for powder coating compositions based on polyester resins
US5322907A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 25, 1992 |
| Grant date | Jun 21, 1994 |
| Priority date | — |
| Expiry date | Mar 25, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09D163/00
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The invention relates to the use of polyglycidyl compounds as hardeners in powder coating compositions based on polyester resins which react with epoxy groups, which compounds are polyglycidyl esters of formula (I) or (II) ##STR1## wherein in formula (I) R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are each independently of one another hydrogen, C.sub.1 -C.sub.4 alkyl or radicals of formula (III) ##STR2## wherein A is a polymethylene group of 2 to 4 carbon atoms, and R.sub.5 and R.sub.6 are each independently of each other hydrogen, C.sub.1 -C.sub.4 alkyl or radicals of formula (III) or, when taken together, are an unsubstituted or a C.sub.1 -C.sub.4 alkyl-substituted methylene or polymethylene group of 2 to 7 carbon atoms, but with the proviso that at least two of the substituents R.sub.1 to R.sub.6 are radicals of formula (III), and, in formula (II) PA1 n is an integer from 2 to 6, PA1 R.sub.7 is an organic radical of valency n of 2 to 30 carbon atoms, and PA1 Z denotes identical or different radicals of formula (IV): ##STR3## wherein R.sub.8 and R.sub.9 are either each independently of the other hydrogen, chloro, bromo or C.sub.1 -C.sub.4 alkyl or one is a radical of formula (V) ##STR4…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.