Patent ID: 6855758
Filing Date: 2005-02-15
Classification: B32B,C08J,C08K,H05K,Y10S,Y10T

Abstract:
1. A transparent, biaxially oriented and heat-set film having one or more layers and comprising, as main constituent, at least one crystallizable thermoplastic, said at least one crystallizable thermoplastic being a polyester or copolyester selected from the group consisting of polyethylene terephthalate (PET), polybutylene terephthalate (PBT), bibenzoyl-modified polyethylene terephthalate (PETBB), bibenzoyl-modified polybutylene terephthalate (PBTBB), wherein in the preparation of said polyester or copolyester use may also be made of isophthalic acid, cis-1,4-cyclohexane-dimethanol (c-CHDM), trans-1,4-cyclohexane-dimethanol (t-CHDM), or a mixture of cis-1,4-cyclohexane-dimethanol and trans-1,4-cyclohexane-dimethanol (c/t-CHDM), wherein the film comprises a hydrolysis stabilizer consisting essentially of (1) a bond restoration agent consisting of either monomeric carbodiimides, aromatic polymeric carbodiimides having an amino group directly bonded to an aromatic ring, or oxazolines, and (2) optionally at least one of either a phenolic compound or an organic phosphite, said bond restoration agent present within said film in an amount ranging from about 0.2 to 3% by weight and said film exhibiting a Yellowness Index of less than 10.