Biaxially stretched polypropylene composite film and electrical

Details Biaxially stretched polypropylene composite film and electrical Biaxially stretched polypropylene composite film and electrical

1979-11-29

1981-08-11

Robinson, Ellis P.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

156229, 2642902, 428379, 428409, 428461, 428515, 428516, 428523, 428910, 361313, 361323, 428336, 428335, B32B 702, B32B 2732, H01G 418

Patent

active

042834538

ABSTRACT:
Disclosed is a biaxially stretched, composite polypropylene film suitable for use as an electrical insulating film, comprising a first layer comprising a first propylene polymer and having a maximum roughness height R.sub.z of its exposed surface of about 0.5 .mu.m, and a second layer contiguous to the first layer comprising a second propylene polymer having a composition different from the first propylene polymer and having a roughness height R.sub.z on its exposed surface ranging between about 0.2 .mu.m and 0.4 .mu.m, with the composite film having a modulus of elasticity of at least about 2000 N/mm.sup.2 in all directions of the plane of the film and a DC dielectric strength of at least about 650 V/.mu.m. Also disclosed is a capacitor comprised of a plurality of these composite films having a metal surface layer and being laminated with one another.

REFERENCES:
patent: Re27823 (1973-11-01), Cox
patent: 3380868 (1968-04-01), Moser
patent: 3620825 (1971-11-01), Lohmann
patent: 3622375 (1971-11-01), Siebel
patent: 3761772 (1973-09-01), Suzuki
patent: 3772578 (1973-11-01), George
patent: 3806775 (1974-04-01), Edman
patent: 3914521 (1975-10-01), Beatty
patent: 3936572 (1976-02-01), Mackenzie
patent: 4068286 (1978-01-01), Iijima
patent: 4133935 (1979-01-01), Dawson
"Propylene", Applied Plastics, Nov. 1961, p. 62.

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