Patent ID: 9109094
Filing Date: 2015-08-18
Classification: B32B,C08J,C09J,Y10T

Abstract:
1. An adhesive polyester film having an adhesive primer layer disposed on at least one side of a substrate polyester film, wherein: the substrate polyester film is a stretched film having linear tearability and formed of a mixed polyester resin containing polyethylene terephthalate and a modified polybutylene terephthalate; the adhesive primer layer contains a polyester resin (A) and a crosslinking agent component content of 0.1% by mass or less, and has a thickness of 0.5 μm or less; and the polyester resin (A) in the adhesive primer layer contains a polybasic acid component and an alcohol component, the polybasic acid component including 40 mol % or more of an aromatic dicarboxylic acid and the alcohol component including 50 mol % or more of a diol, and the polyester resin (A) having an acid number of 20 to 60 mg KOH/g, a hydroxyl number of 30 to 150 mg KOH/g, an oligomer content of 2.0% by mass or less, and a number average molecular weight of 2000 to 5000.