Heat-curable pulverulent coating agent consisting of a mixture of copolymers containing anhydrides and curing accelerators

Claim 1

PULVERULENT COATING AGENT OF A MIXTURE OF A. A COPOLYMER OF RELATIVELY LOW MOLECULAR WEIGHT, WHICH CONTAINS GLYCIDYL GROUPS AND IS A COPOLYMER OF SEVERAL ETHYLENICALLY UNSATURATED COMPOUNDS, B. AT LEAST ONE DICARBOXYLIC ACID ANHYDRIDE IN AN AMOUNT CORRESPONDING TO 0.4 - 1.0 ANHYDRIDE GROUPS PER EPOXY GROUP (GLYCIDYL GROUP) OF THE COPOLYMER AND C. A CURING ACCELERATOR IN THE FORM OF AN ORGANIC BASE, D. A FLOW CONTROL AGENT IN AN AMOUNT OF AT LEAST 0.05 PER CENT BY WEIGHT OF THE MIXTURES, WHICH AGENT IS A POLYMER OF MOLECULAR WEIGHT, (MN) OF AT LEAST 1,000 AND HAS A GLASS TRANSITION TEMPERATURE WHICH IS AT LEAST 50*C LOWER THAN THE GLASS TRANSITION TEMPERATURE OF THE COPOLYMER (A), CHARACTERISED IN THAT THE COMPONENT (A) CONSISTS OF 84 TO 94 PER CENT BY WEIGHT OF COPOLYMERS CONTAINING EPOXIDE GROUPS AND HYDROXYL GROUPS, WHICH COPOLYMERS HAVE DURRAN SOFTENING POINTS OF ABOUT 90*-120*C AND ARE SOLUBLE IN ORGANIC SOLVENTS AND WHICH CONSIST ESSENTIALLY OF: A. 6-24 PER CENT BY WEIGHT OF ETHYLENICALLY UNSATURATED A EPOXIDE MONOMERS WITH 6-12 CARBON ATOMS, OF THE GENERAL FORMULA