Patent ID: 7148295

Claim:
A thermally curing powder lacquer comprising: A) a binding-agent component comprising groups that are capable of reacting with carboxylic acid groups and B) a crosslinker component that is a mixture, which is present in solid form below 40° C. and in liquid form above 160° C., said mixture consisting of at least two polycarboxylic acids each melting above 95° C. with up to 20 carbon atoms and selected from malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, undecanedioic acid, dodecanedioic acid, tridecanedioic acid, tetradecanedioic acid, pentadecanedioic acid, hexadecanedioic acid, octadecanedioic acid, eicosanedioic acid, the isomeric cyclohexanedicarboxylic acids, maleic acid, phthalic acid, isophthalic acid, terephthalic acid, tetrahydrophthalic acid, trimellitic acid and the isomeric pyridinedicarboxylic acids, said mixture containing at least 5 wt. % of the polycarboxylic acid with the lowest melting point and containing at least 10 wt. % of the polycarboxylic acid with the highest melting point, wherein the preceding percentages are based on the total weight of all of the polycarboxylic acids present in the mixture in an amount of at least 5 wt. %, and C) optionally further auxiliary agents and additives known from powder-lacquer technology, provided that the components A) and B) are present in such quantitative ratios that from 0.7 to 1.5 carboxyl groups of component B) are allotted to each group of component A) that is capable of reacting with carboxyl groups.