Dimensionally stable poly-m-phenylene isophthalamide film

Details Dimensionally stable poly-m-phenylene isophthalamide film Dimensionally stable poly-m-phenylene isophthalamide film

1983-04-05

1985-09-03

Anderson, Harold D.

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

Synthetic resins

From carboxylic acid or derivative thereof

528183, 528337, 528338, 528339, 528340, 528344, C08G 6932

Patent

active

045393931

ABSTRACT:
A process for producing an aromatic polyamide film, which comprises drawing an undrawn aromatic polyamide film biaxially at a draw ratio of at least 1.5 in a solvent mixture consisting of (a) 5% to 75% by weight of a good solvent of the aromatic polyamide and (b) 25% to 95% by weight of a non-solvent of the aromatic polyamide, and heat treating the drawn film, which contains at least 1% by weight, based on the weight of the film, of a good solvent of said aromatic polyamide, at a temperature of not lower than 150.degree. C.
An m-phenyleneisophthalamide polymer film having extremely excellent dimensional stability under moist conditions, which film has a density d of from 1.35 to 1.41 g/cm.sup.3 and principal refractive indices n.sub..alpha., n.sub..beta. and n.sub..gamma. (n.sub..alpha. >n.sub..beta. >n.sub..gamma.) for D-line of a wavelength of 589 nm satisfying the following formula: ##EQU1##

REFERENCES:
patent: 3287324 (1966-11-01), Sweeny
patent: 4346215 (1982-08-01), Garlington et al.

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