Casting films of poly(meta-phenylene isophthalamide) and its cop

Details Casting films of poly(meta-phenylene isophthalamide) and its cop Casting films of poly(meta-phenylene isophthalamide) and its cop

1976-06-16

1978-01-24

Lowe, James B.

Plastic and nonmetallic article shaping or treating: processes

Disparate treatment of article subsequent to working,...

Washing of article

260 47CZ, 260 78R, 260 78A, 264216, 264237, 264291, 264331, B29D 724

Patent

active

040704335

ABSTRACT:
An aromatic polyamide film having a dielectric strength of at least about 150 kv/mm which is useful as an electric insulating material. This film is obtained by casting a solution comprising poly(m-phenylene isophthalamide) or a copolymer thereof and an amide type solvent, drying the cast product to form a film having a residual solvent content of not more than about 60% by weight, immersing the film in an aqueous medium kept at not more than about 20.degree. C, and stretching the resulting wet film containing at least about 5% by weight of the aqueous medium in at least one direction to at least about 1.4 times the original dimension.

REFERENCES:
patent: 3006899 (1961-10-01), Hill, Jr. et al.
patent: 3063966 (1962-11-01), Kwolek et al.
patent: 3094511 (1963-06-01), Hill, Jr. et al.
patent: 3354127 (1967-11-01), Hill, Jr. et al.
patent: 3414645 (1968-12-01), Morgan, Jr.
patent: 3696076 (1972-10-01), Vogelfanger

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