| abstract |
The present invention provides a coextruded biaxially stretched polyester film having good heat seal properties, release properties and oxygen gas barrier properties, which can be suitably used as a lid for trays made of CPET or CPET / APET. A co-extruded biaxially stretched polyester film comprising a base layer B and a heat-sealable outer layer A, wherein the outer layer A is (1) heat-sealed to a CPET layer or a CPET layer / APET layer and then peeled off. is possible, (2) and 80 to 99 wt% of the polyester (a), the average particle size d 50 of 1 to 10% by weight consists of a particle is 2.5～12Myuemu, polyester (a) is 12 A polyester having 89 mol% aromatic dicarboxylic acid units and 11 to 88 mol% aliphatic dicarboxylic acid units, and the average particle size of the particles contained in the outer layer A and the thickness of the heat-sealable outer layer A are 1 or more, and the base layer B contains MXD6. [Selection figure] None |