Patent ID: 7585565
Filing Date: 2009-09-08
Classification: B32B,C08L,Y10T

Abstract:
1. A multilayer film, comprising an upper layer a), and one middle layer b), and a backing layer c), wherein the multilayer film is produced by a process selected from the group consisting of lacquering, lamination and coextrusion, wherein a) the upper layer consists of a first light stabilizer and a first (meth)acrylate copolymer, and optionally contains at least one substance selected from the group consisting of a first light stabilizer, a first thermal oxidation stabilizer, a first process stabilizer, and combinations thereof; b) the middle layer consists of a dye and a second (meth)acrylate copolymer, and optionally contains at least one material selected from the group consisting of a second thermal oxidation stabilizer, a second process stabilizer, and a second light stabilizer, and combinations thereof; and c) the backing layer consists of 70-100% of polycarbonate and 0% to 30% of at least one ingredient selected from the group consisting of the first (meth)acrylate copolymer, the second (meth)acrylate copolymer, the first light stabilizer, the second light stabilizer, the dye, the first thermal oxidation stabilizer, the second thermal oxidation stabilizer, the first process stabilizer, the second process stabilizer, and combinations thereof; wherein the first (meth)acrylate copolymer may be the same or different from the second (meth)acrylate copolymer, wherein the first (meth)acrylate copolymer and the second (meth)acrylate copolymer, independently of each other, consist of the following units: i) from 95 to 5% by weight of methyl methacrylate units and, optionally from 0 to 40% by weight of other vinylic monomer units and b) from 5 to 95% by weight of esters of (meth)acrylic acid, wherein the radicals in the ester groups are selected from the group consisting of: a cycloalkyl radical having from 5 to 12 carbon atoms, a multiple-alkyl-substituted cycloalkyl radical having from 5 to 12 carbon atoms, and combinations thereof, wherein the above described radicals may have bonding to the (meth)acrylic acid carboxyl radicals by way of alkylene groups having from 1 to 6 carbon atoms, which may also have branching, or oxyalkylene groups having from 2 to 4 carbon atoms, wherein a test specimen produced from a mixture comprising 20% by weight of the (meth)acrylate copolymer from b) and 80% by weight of polycarbonate from c) has a tensile strain at break of at least 75% (ISO 527-2) at 23° C., and wherein a test specimen produced from a mixture comprising 20% by weight of the (meth)acrylate copolymer from a) and 80% by weight of polycarbonate from c) has a tensile strain at break of at least 75% (ISO 527-2) at 23° C., and wherein the upper layer a) is the uppermost layer of the multilayer film.