Production of coatings

Claim 1

A process for the production of a coating which comprises: reacting (A) a polyhydroxy polyacrylate resin comprising esters of acrylic acid or methacrylic acid with monofunctional aliphatic alcohols, monoesters of acrylic acid or methacrylic acid with polyfunctional aliphatic alcohols and other copolymerizable olefinically unsaturated monomers with (B) isocyanurate-containing polyisocyanates which have a functionality of from 2.5 to 6 and which may be partially or completely blocked with CH--, NH-- or OH--acidic blocking agents, wherein the polyhydroxy polyacrylate resin (A) used is a hydroxyl-containing copolymer comprising (a) from 6 to 70% by weight of one or more esters of the formula ##STR11## where R is hydrogen or methyl, R' is straight-chain or branched alkylene of 2 to 18 carbon atoms or an alkylene radical of 7 to 17 carbon atoms which contains not more than three cycloaliphatic groups, and, if appropriate, some or all of the groups HO--R'-- can be replaced by the group Z--O--R'--, where Z is a radical of the formula ##STR12## where n is an integer from 1 to 3 and R" is an alkylene chain of 4 to 8 carbon atoms which may additionally contain from 1 to 3 alkyl substituents having in total not more than 10 carbon atoms or a cycloaliphatic radical of 6 to 10 carbon atoms or an unsubstituted or alkyl-substituted aromatic radical of 6 to 8 carbon atoms or an araliphatic radical of 7 to 9 carbon atoms or an alkoxy radical of 1 to 8 carbon atoms, (b) from 0 to 40% by weight or from 0 to 50% by weight, respectively, of one or more hydroxyalkyl esters of acrylic acid or methacrylic acid of the formula ##STR13## where R is hydrogen or methyl and R" is an alkyl radical of a branched aliphatic carboxylic acid of 4 to 26 carbon atoms, (c) from 10 to 50% by weight of one or more alkyl acrylates or methacrylates which form homopolymers having glass transition temperatures of from +5° C. to +120° C., (d) from 0 to 10% by weight of a vinyl-aromatic, (e) from 10 to 60% by weight of one or more alkyl esters, or alkylglycol esters containing not more than 2 etheroxygen bridges, of acrylic acid or methacrylic acid, which esters form homopolymers having glass transition temperatures of from -80° C. to +4.5° C., (f) from 0 to 10% by weight of an acrylamide or methacrylamide which may or may not be substituted at the amide nitrogen by one or two alkyl radicals of 1 to 8 carbon atoms, which may contain a carbonyl group, or by one or two phenyl radicals, (g) from 1 to 25% by weight of one or more polymerizable, olefinically unsaturated, heterocyclic compounds of the formulae (I) to (VIII) ##STR14## where R is hydrogen or methyl and R 1 , R 2 , R 3 and R 4 are identical or different and are each hydrogen, methyl, ethyl, straight-chain or branched alkyl of 3 or 4 carbon atoms, phenyl which is unsubstituted or substituted by alkyl of 1 to 4 carbon atoms, halogen or nitro, a group of the formula --R I --A--R II , where A is oxygen or sulfur, R I is methylene or ethylene or is phenylene which is unsubstituted or substituted by alkyl of 1 to 4 carbon atoms, halogen or nitro, and R II is methyl or ethyl or is phenyl which is unsubstituted or substituted by alkyl of 1 to 4 carbon atoms, halogen or nitro, or R 1 , R 2 , R 3 and R 4 are each halogen, nitro or a group of the formula --OR III , --COOR III , --SO 2 R III , --CONR III R IV or --SO 2 NR III R IV , where R III and R IV are identical or different and are each methyl, ethyl, a straight-chain or branched alkyl radical of 3 or 4 carbon atoms or phenyl which is unsubstituted or substituted by alkyl of 1 to 4 carbon atoms, halogen or nitro, and furthermore, R 2 and R 3 in formulae (I), (II), (III), (V), (VI) and (VIII) or R 3 and R 4 in formula (III), and either R 3 and R 4 or R 1 and R 2 or R 3 and R 4 as well as R 1 and R 2 in formulae (II) and (IV), together with the heterocyclic structure, can form a fused six-membered aromatic ring which is unsubstituted or substituted by alkyl of 1 to 4 carbon atoms, halogen or nitro, and (h) from 0 to 20% by weight of monomers which are not mentioned under (a) to (g) and whose copolymerized radicals are inert to isocyanate groups, with the proviso that the sum of the percentages stated under (a) and (b) is from 6 to 70, the sum of the percentages stated under (c), (d) and (g) is from 11 to 60 and the sum of the percentages of the components stated under (a) to (h) is 100, and the isocyanurate-containing polyisocyanate (B) with a functionality of from 2.5 to 6 is one which predominantly contains cycloaliphatically bonded isocyanate groups.