Patent ID: 6355336
Filing Date: 2002-03-12
Classification: B32B,Y10S,Y10T

Abstract:
A multi-layer packaging film comprising an intermediate layer having at least one outer layer on both surfaces of the intermediate layer, and having the thickness of not more than 40 &mgr;m,said outer layer comprising a polyolefin resin, said intermediate layer comprising a polytetramethylene terephthalate resin which is constituted by polytetramethylene terephthalate units of 70 to 99 mol %; is obtained by copolymerizing polytetramethylene oxide glycol having a number-average molecular weight of 300 to 5,000; and has an intrinsic viscosity of 0.7 to 2.0, a melting point of 200 to 228Â° C. and a crystallization temperature of not higher than 180Â° C., and the thickness of said intermediate layer being 20 to 80% of the thickness of the multi-layer film.