Heat-curing powder-lacquer compositions yielding a matte surface after curing of the coating, as well as a simple method for production of same

1. A powder-lacquer composition, comprising:

A) at least one carboxylate-group-containing polymer having an acid number of 5 to 250 mg KOH/g and a glass transition temperature T g higher than 40° C.,

and

B) at least one β-hydroxyalkylamide having two or three or four β-hydroxyalkylamide groups per molecule of formula I

wherein

R 1 , R 2 : independently of one another denote the same or different radicals, selected from the group consisting of alkyl radicals, cycloalkyl radicals, aryl radicals, aralkyl radicals and alkenyl radicals having 1-24 carbon atoms, wherein the radicals optionally contain a heteroatom and/or a functional group and wherein R 1 may also be hydrogen,

and wherein R 2 may also be

and

A is selected from the group consisting of A 1 and A 3 :

wherein R 3 : independently of one another denote the same or different radicals, selected from the group consisting of hydrogen, alkyl radicals, cycloalkyl radicals, aryl radicals, aralkyl radicals and alkenyl radicals having 1-24 carbon atoms, wherein the radicals optionally contain a heteroatom and/or a functional group and wherein two or more R 3 substituents optionally are linked to one another to form a ring;

wherein the β-hydroxyalkylamide exists in solid form below 150° C.;

C) optionally, a processing aid and/or an additive;

wherein the ratio of β-hydroxyalkylamide groups to the carboxylate groups ranges between 0.5:1 and 1.5:1.

2. The powder-lacquer composition according to claim 1 , wherein said β-hydroxyalkylamide is obtained from a β-hydroxyalkylamine containing an alkyl group having at least 2 to 10 carbon atoms in the hydrocarbon skeleton, wherein the alkyl group may be linear, branched or cyclic, and wherein the alkyl group may be substituted with a hetero atom, wherein the alkyl group may also contain a functional group.

3. The powder-lacquer composition according to claim 1 , wherein said β-hydroxyalkylamide is obtained from an N-alkyl-1,2-alkanolamine and/or an N,N-bis-2-hydroxyalkylamine and an ester of cyclohexanedicarboxylic acid.

4. The powder-lacquer composition according to claim 2 , wherein said

β-hydroxyalkylamine has Formulae II and/or III

Formula II is

wherein

R 1 denotes hydrogen, methyl, ethyl, or propyl,

R 2 denotes methyl;

Formula III is

wherein R 1 denotes hydrogen, methyl, ethyl, or propyl, either simultaneously or independently of one another.

5. The powder-lacquer composition according to claim 2 , wherein at least one compound selected from the group consisting of

diethanolamine (DEA), diisopropanolamine (DIPA), di-sec-butanolamine, N-methylethanolamine, and N-methyl-isopropanolamine is used as starting material for production of the β-hydroxyalkylamide.

6. The powder-lacquer composition according to claim 2 , wherein a 1,2 substituted cyclohexanedicarboxylic acid derivative, and/or a 1,4-substituted cyclohexanedicarboxylic acid derivative is used as starting compound for substituents A for production of the β-hydroxyalkylamide.

7. The powder-lacquer composition according to claim 2 , wherein, for production of the β-hydroxyalkylamide, at least one compound selected from the group consisting of A 4 and A 6 is used as starting material

wherein R 4 denotes methyl, ethyl, propyl, butyl simultaneously or independently of one another.

8. The powder-lacquer composition according to claim 6 , wherein a 1,4-substituted cyclohexanedicarboxylic acid ester is used as starting compound.