Cold drawn high-orientation multilayered film and process for manufacture of said film

Claim 1

A cold drawn high-orientation multilayered O 2 barrier film, having a tensile strength of not less than 5.0 Kg/mm 2 , the principal component layers of said film being highly oriented, said multilayer film comprising at least one layer preponderantly comprising a cold-drawable resin selected from the group consisting of blended and unblended specific polymers, [1] (B)+(A)+(C), [2] (B)+(A), [3] (B)+(C), [4] (D), and [5] (E), wherein (A) is at least one ethylene type polymer selected from the group consisting of copolymers of ethylene with another monomer selected from the group consisting of unsaturated carboxylic acids and alkyl esters of said carboxylic acids, ionically crosslinked resins derived from said copolymers and low-density polymers of ethylene, (B) is a soft copolymer elastomer having a Vicat softening point of not more than 60° C., (C) is at least one polymer selected from the group consisting of crystalline polypropylene, high-density polyethylene, crystalline polybutene-1 and polymethyl pentene-1, (D) is a crystalline polybutene-1 having a concentration of 50 to 100% by weight, and (E) is an ionically crosslinked resin, said multilayered film consisting of at least one cold drawable resin layer (CDR) and at least one layer (Br) formed of a polymer possessing an O 2 barrier property, and said film having a multilayer construction represented by the combination of CDR/Br, CDR/Br/CDR, Br/CDR/Br, Br/CDR/Br/CDR, or CDR/Br/CDR/Br/CDR.