Method for improving impulse destructive stength of electrical i

Details Method for improving impulse destructive stength of electrical i Method for improving impulse destructive stength of electrical i

1985-10-01

1991-02-19

McCamish, Marion C.

Textiles: spinning, twisting, and twining

5762975, 576293, 576284, 576347, C08F 1816

Patent

active

049945394

ABSTRACT:
The present invention provides a method for improving impulse destructive strength of an electrical insulating material which is characterized by employing, as said electrical insulating material, an ethylene copolymer prepared by subjecting, to a high-pressure radical polymerization, ethylene or a mixture of ethylene and another monomer in the presence of at least one selected from the group consisting of one- to three-ring aromatic compounds (except styrene and substituted styrenes each having a single ring) each having one carbon-carbon double bond in one molecule, at a polymerization pressure of 500 to 4,000 kg/cm.sup.2 at a polymerization temperature of 50.degree. to 400.degree. C., with said ethylene copolymer containing 0.005 to 1 mol % of a unit derived from said aromatic compound as a polymeric component.

REFERENCES:
patent: 3741947 (1973-06-01), Schrott
patent: 4211730 (1980-07-01), Vollkommer
patent: 4349651 (1982-09-01), Smith
patent: 4717759 (1988-01-01), Onikasa et al.

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