Patent ID: 6730406
Filing Date: 2004-05-04
Classification: B32B,C08L,Y10S,Y10T

Abstract:
A coextruded, biaxially oriented polyester film composed of a base layer and of at least one outer layer, where the film comprises, as flame retardant, at least one organic phosphorous compound soluble in thermoplastics, and further comprises at least one UV stabilizer and wherein the film has a mat outer layer which comprises a mixture or a blend or a mixture and a blend made from two components I and II, where component I is essentially a polyethylene terephthalate homopolymer or polyethylene terephthalate copolymer or a mixture made from polyethylene terephthalate homopolymer or from polyethylene terephthalate copolymers, and component II is a polymer which is a condensation product of the following monomers or of their derivatives capable of forming polymers or of the following monomers and of their derivatives capable of forming polymers:A) from about 65 to about 95 mol % of isophthalic acid; B) from 0 to about 30 mol % of at least one aliphatic dicarboxylic acid with the formula HOOC(CH2)nCOOH where n is from 1 to 11; C) from about 5 to about 15 mol % of at least one sulfomonomer containing an alkali metal sulfonate group on the aromatic moiety of an aromatic dicarboxylic acid; D) a copolymerizable aliphatic or cycloaliphatic glycol having from 2 to 11 carbon atoms, in the stoichiometric amount necessary to form about 100 mol % of condensate; where each of the percentages given is based on the total amount of the monomers forming component II.