Patent ID: 6589378
Filing Date: 2003-07-08
Classification: B32B,C08L,Y10T

Abstract:
A process for producing a UV-stable laminated structure having thermal aging resistance, which process comprises coextruding the following layers in a single-stage operation:a substrate layer comprisingâ€”based on the sum of the amounts of the following components A and B and, if used, C and/or D, which totals 100% by weightâ€”1-99% by weight component A, which is of a graft copolymer of 1-99% by weight of a particulate graft base A1 comprising the following monomers: 80-99.99% by weight of at least one C1-8-alkyl ester of acrylic acid as component A11; 0.01-20% by weight of at least one polyfunctional crosslinking monomer as component A12; 1-99% by weight of a graft A2 comprising the following monomers based on A2; 40-100% by weight of units of styrene, a substituted styrene or a (meth)acrylate, or mixtures thereof, as component A21 and up to 60% by weight of units of acrylonitrile or methacrylonitrile as component A22; the graft A2 comprising at least one graft shell and the graft copolymer having a mean particle size of 50-1000 nm; 1-99% by weight of component B, which is a copolymer of 40-100% by weight of units of styrene, a substituted styrene or a (meth)acrylate, or mixtures thereof, as component B1, and up to 60% by weight of acrylonitrile or methacrylonitrile as component B2; 0-80% by weight of component C, which is a polycarbonate: and 0-50% by weight of component D, which is a fibrous or particulate filler or mixtures thereof; and a transparent top layer of polymethyl methacrylate, followed by thermoforming said UV-stable laminated structure to produce a molding, followed by backspraying or back-casting the molding with the material of said substrate layer or with a polyurethane foam or laminating said substrate material layer or polyurethane foam onto said molding.