Cold drawn film made of an olefin polymer blend composition

Details Cold drawn film made of an olefin polymer blend composition Cold drawn film made of an olefin polymer blend composition

1979-07-25

1982-06-22

Seccuro, Carman J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525240, C08L 2316, C08L 2312, C08L 2306, C08L 2308

Patent

active

043363504

ABSTRACT:
A composition for shrinkable film which excels in heat-sealability, transparency, strength, and particularly low-temperature quick shrinking property and, therefore, suits production chiefly of packaging materials, a film made of the composition and a process for the manufacture of the film are disclosed. Specifically, the composition comprises one of the specific combinations of components (A), (B) and (C), i.e. the combinations of (A)+(B), (B)+(C) and (A)+(B)+(C), wherein (A) is non-rigid polyolefin resins such as ethylene vinyl acetate, (B) is an elastomer comprising a specific ethylene-.alpha.-olefin copolymer, and (C) is rigid polyolefin resins such as polypropylene. The packaging film excelling particularly in optical property, mechanical strength and low-temperature shrinking property is obtained by converting a homogeneous blend of the aforementioned composition, either in its crosslinked form or in its non-crosslinked form, into a tubular raw film, which is stretched at a temperature low enough for imparting a high orientation to the film. The process for the manufacture of this packaging film is also disclosed.

REFERENCES:
patent: 3407253 (1968-10-01), Yoshimura et al.
patent: 4031169 (1977-07-01), Morris
patent: 4036912 (1977-07-01), Stricharczuk
patent: 4087485 (1978-05-01), Huff
patent: 4186240 (1980-01-01), Matsuda et al.
Exxon Elastomers For Polyolefin Modification, pp. 4, 3, 43, and 44 (1975).

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