Patent ID: 8192844

Claim:
A composite material produced by a process, comprising: coating a surface of a first material, to obtain a composite material with a surface finish; and wherein the surface finish is based on at least one thermoplastic polymethacrylate layer; wherein the at least one polymethacrylate layer is applied to the first material at a temperature which permits chemical bonding of the polymethacrylate layer to the first material; wherein the at least one thermoplastic polymethacrylate layer which is obtained by: mixing polymers for which the basis is provided by polymerized monomer mixtures a. and b., wherein monomer mixter a. comprises: A) from 20 to 100% by weight of methyl methacrylate, B) from 0 to 80% by weight of a (meth)acrylate of the formula I, other than methyl methacrylate, wherein R 1 is a hydrogen or a methyl, and R 2 is a linear or branched alkyl radical or cycloalkyl radical having from 1 to 18 carbon atoms or is phenyl or naphthyl, C) from 0 to 40% by weight of a further unsaturated monomer other than a.A) and a.B), but copolymerizable with these, wherein component a.C) is styrene, a styrene derivative, a vinyl esters, vinyl chloride, vinyl fluoride or an olefin; wherein (a.A) to (a.C) together give 100% by weight of the copolymerizable constituents of a., and from 0 to 80 parts by weight of further polymers, and also amounts of from 0 to 150 parts by weight of conventional additives, are added to 100 parts by weight of this polymerized mixture; and monomer mixture b. comprises: A) from 20 to 99% by weight of a methyl (meth)acrylate of the formula I wherein R 1 is a hydrogen or a methyl and R 2 is a linear or branched alkyl radical or cycloalkyl radical having from 1 to 18 carbon atoms, or is phenyl or naphthyl, B) from 1 to 80% by weight of one or more ethylenically unsaturated “reactive monomers” other than b.A) but copolymerizable with (b.A), wherein (b.A) and (b.B) together give 100% by weight of the copolymerizable constituents of b., and from 0 to 80 parts by weight of further polymers, and also amounts of from 0 to 150 parts by weight of conventional additives, are added to 100 parts by weight of this polymerized mixture; and wherein a ratio of the polymerized monomer mixtures a. and b. in the polymethacrylate-based surface finish is 50 to 99% by weight of the polymerized mixture a., to the corresponding amount of b to give 100% by weight.