Process for producing high modulus film

Details Process for producing high modulus film Process for producing high modulus film

1987-02-17

1989-09-19

Lowe, James

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Reshaping running or indefinite-length work

2642884, B29C 5502

Patent

active

048679372

ABSTRACT:
The invention provides a two-step process for increasing the modulus of a film in a desired direction, by drawing the film at between about 10.degree. C. above T.sub.g and 40.degree. C. below T.sub.m at a draw ratio of between 1.05 and 5.5 and then drawing the film in the same direction at between about 5.degree. C. and 35.degree. C. below T.sub.m at a draw ratio of between about 1.05 and 2.5.

REFERENCES:
patent: 2823421 (1958-02-01), Scarlett
patent: 3177277 (1965-04-01), Adams et al.
patent: 4110395 (1978-08-01), Akutin et al.
patent: 4226826 (1980-10-01), Motegi et al.
patent: 4370291 (1983-01-01), Kazama et al.
patent: 4477407 (1984-10-01), Hetherington et al.
patent: 4497865 (1985-02-01), Minami et al.

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