Heat-curable pulverulent coating agent of a mixture of a copolymer containing glycidyl groups and an adduct of aliphatic dicarboxylic acid and 2,4,6-tris-(N',N",N'"-dimethylaminomethyl)-phenol

Claim 1

Pulverulent coating agent of a mixture of A. a copolymer which contains glycidyl groups and which is a copolymer of several ethylenically unsaturated compounds and has a relatively low molecular weight, B. at least one aliphatic dicarboxylic acid, in an amount corresponding to 0.8 - 1.1 acid groups per epoxy group of the copolymer and C. a curing accelerator in the form of an organic base, and optionally D. a flow control agent, in an amount of at least 0.05 percent by weight of the mixture, which is a polymer of molecular weight (M n ) 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 80 to 96 percent by weight of copolymers, containing epoxide groups and hydroxyl groups, which have Durran softening points of about 90° - 120° C. and are soluble in organic solvents, of a. 6 to 24 percent by weight of ethylenically unsaturated epoxide monomers with 6 - 12 carbon atoms, of the general formula ##STR6## wherein R.sub.1 and R.sub.2 = H or --CH.sub.3 ##STR7## b. 4 - 20 percent by weight of hydroxyalkyl esters of acrylic acid or methacrylic acid, wherein the hydroxyalkyl ester group is saturated and contains 2 - 4 C atoms, c. 10 - 80 percent by weight of acrylic acid esters or methacrylic acid esters of aliphatic saturated monoalcohols with 1 - 8 carbon atoms and d. 10 - 60 percent by weight of styrene or vinyltoluene; and B. consists of 4 - 20 percent by weight of an adduct of a saturated straight-chain aliphatic dicarboxylic acid of the formula HOOC--(CH 2 ) n --COOH, wherein n is a whole number from 4 to 11, and 2,4,6-tris(N',N",N"'-dimethylaminomethyl)-phenol, and these components of the adduct can be present in a weight ratio of 97:3 to 99:1; optionally together with other customary additives.