Method for improving impulse destructive strength of electrical

Details Method for improving impulse destructive strength of electrical Method for improving impulse destructive strength of electrical

1987-06-08

1988-05-31

Schofer, Joseph L.

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

526 88, 526347, 526913, 174110SR, 174137B, C08F21208

Patent

active

047482095

ABSTRACT:
The present invention provides a method for improving impulse destructive strength of an electrical insulating material which is characterized by employing, as the electrical insulating material, a random copolymer of a styrene series monomer and ethylene or a combination of ethylene and another ethylenic unsaturated monomer, or a composition in which the copolymer is blended with an ethylene series polymer, the copolymer being prepared by introducing, into a reaction system, the styrene series monomer selected from the group of styrene and single-ring substituted styrenes, ethylene or the combination of ethylene and the ethylenic unsaturated monomer and a polymerization initiator, the latter being introduced thereinto separately from at least the styrene series monomer, and subjecting these monomers to a high-pressure radical copolymerization under a polymerization pressure of 500 to 4,000 kg/cm.sup.2 at a polymerization temperature of 50.degree. to 400.degree. C., the aforesaid polymer or composition satisfying the following (a) and (b):

REFERENCES:
patent: 3293233 (1966-12-01), Erchak, Jr. et al.
patent: 3888709 (1975-06-01), Burk
patent: 4029875 (1977-06-01), Gloriod et al.
patent: 4547551 (1985-10-01), Bailey et al.

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