Polypropylene film

Details Polypropylene film Polypropylene film

1996-01-26

1998-03-10

Warzel, Mark L.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

525240, C08F11006

Patent

active

057262691

ABSTRACT:
A film having a low dependency of film transparency on film-forming conditions and film thickness, and having superior transparency and rigidity without compromising the original properties of polypropylene film. The film is produced from a polypropylene prepared from a propylene polymer having (1) a stereoirregularity index mmrr/mmmm of a part insoluble in xylene at 20.degree. C. within the range of 0.0095 to 0.0200; (2) a melting temperature within the range of 145.degree. to 160.degree. C.; (3) a part soluble in xylene at 20.degree. C. of 3.5% by weight or less, the polypropylene having: (4) a melt flow rate at 230.degree. C. within the range of 5 to 15 g/10 min.; and (5) a swelling ratio within the range of 1.20 to 1.35.

REFERENCES:
patent: 4161574 (1979-07-01), Strametz et al.
patent: 4522982 (1985-06-01), Ewen
patent: 4668753 (1987-05-01), Kashiwa et al.

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