Casting films of polymers of meta-phenylene isophthalamide

Details Casting films of polymers of meta-phenylene isophthalamide Casting films of polymers of meta-phenylene isophthalamide

1981-07-02

1983-03-29

Lowe, James B.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

By casting liquids on a solid supporting or shaping surface

264230, 264233, 264235, 26433119, 264342RE, B29D 702

Patent

active

043783260

ABSTRACT:
Film of a wholly aromatic polyamide, at least 85% of the repeating units of which are meta-phenylene isophthalamide units, which is undrawn and noncrystalline and which has improved impact strength. Such film is made by heat-treating film of the polyamide which is undrawn and noncrystalline at 400.degree. to 300.degree. C. for from 2 seconds to 2 minutes while maintaining the film at constant length and width permitting it to shrink by at most 20% in each of the length and width.

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