Stretched composite film

Details Stretched composite film Stretched composite film

1982-11-22

1984-09-18

Ives, Patricia C.

Stock material or miscellaneous articles

Composite

Of addition polymer from unsaturated monomers

428520, 428910, 4284761, 428483, 4284763, 264176R, B32B 2708, B32B 320

Patent

active

044724853

ABSTRACT:
A stretched composite film composed of a first film layer (A) of a saponified product of an ethylene/vinyl acetate copolymer, and melt-laminated respectively to both surfaces of the first film layer (A), second film layers (B) and (B') of a blend composed of an unsaturated carboxylic acid-grafted polypropylene and polypropylene, said blend having (i) an ethylene content, C.sub.2, of at most 0.6% by weight and (ii) a melt flow index, MFI, of not more than 25 g/10 minutes with (iii) the ethylene content (C.sub.2) and the melt flow index (MFI) satisfying the expression log MFI.ltoreq.1.4(1-C.sub.2). The composite film optionally further comprises a third film layer (C) of a thermoplastic synthetic resin melt-laminated to the surface of one of the second film layers (B) and (B').

REFERENCES:
patent: 3862265 (1975-01-01), Steinkamp et al.
patent: 3868433 (1975-02-01), Bartz et al.
patent: 3931449 (1976-01-01), Hirata et al.
patent: 4058647 (1977-11-01), Inoue et al.
patent: 4079850 (1978-03-01), Suzuki et al.
patent: 4198327 (1980-04-01), Matsumoto et al.
patent: 4361628 (1982-11-01), Krueger et al.

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