Patent ID: 9352395
Filing Date: 2016-05-31
CPC Classification: B23B,B29C,B32B,Y10T

Claim Text:
1. A heat-shrinkable multilayer film adapted for deep draw forming, comprising: a surface layer (a) comprising a thermoplastic resin, an intermediate layer (b) comprising a polyamide resin, and a surface layer (c) comprising a sealable resin, wherein, (A) the intermediate layer (b) comprises a mixture of an aliphatic polyamide having a melting point of at least 180° C., and an amorphous aromatic polyamide comprising a polycondensation product of an aliphatic diamine with isophthalic acid and terephthalic acid as main acid components, including 25-45 wt. % of the amorphous aromatic polyamide, and has a thickness exceeding 25% and at most 50% of a total thickness of whole layers, and the multilayer film exhibits: (B) tensile stresses at an elongation of 100% as measured in a tensile test at 100° C., including 3-22 MPa in at least one of a longitudinal direction (MD) and a transverse direction (TD) and an average of MD and TD values of 3-20 MPa, and (C) a shrinkage in hot water at 90° C. of 3 to 20% in each of MD and TD.