Patent ID: 6753053
Filing Date: 2004-06-22
Classification: B32B,B65D,Y10T

Abstract:
A laminated film produced by a co-extrusion inflation method, comprising:an outermost layer (A) comprising a polybutylene terephthalate homopolymer, a polybutylene terephthalate copolymer or a mixture of the polybutylene terephthalate homopolymer and the polybutylene terephthalate copolymer; and an innermost layer (B) comprising a heat-sealing resin, said outermost layer (A) having a shape factor of not less than 2.2, which shows a peak shape of Raman spectrum thereof and is represented by the following formula (1): Shape factor=La/Lbâ€ƒâ€ƒ(1) Wherein La and Lb represent peak widths being present on higher- and lower-frequency sides, respectively, relative to a perpendicular line drawn from a peak top to a base line formed by a tangent line taken before and after the peak based on carbonyl stretching vibration, and being taken along a horizontal line at a height corresponding to one half of an intensity of the peak.