| 摘要 |
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) (see formula I, II) wherein in formula (I) R1, R2, R3 and R4 are each independently of one another hydrogen, C1-C4alkyl or radicals of formula (III) (see formula III) wherein A is a polymethylene group of 2 to 4 carbon atoms, and R5 and R6 are each independently of each other hydrogen, C1-C4alkyl or radicals of formula (III) or, when taken together, are an unsubstituted or a C1-C4alkyl- substituted methylene or polymethylene group of 2 to 7 carbon atoms, but with the provis o that at least two of the substituents R1 to R6 are radicals of formula (III), and, in formula (II) n is an integer from 2 to 6, R7 is an organic radical of valency n of 2 to 30 carbon atoms, and Z denotes identical or different radicals of formula (IV): (see formula IV) wherein R8 and R9 are either each independently of the other hydrogen, chlor o, bromo or C1-C4alkyl or one is a radical of formula (V) (see formula V) and the other is hydrogen, chloro, bromo or C1-C4alkyl, and the six-membered ring in formula (IV) is aromatic or non-aromatic.
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