Method for preventing degradation and deterioration of vulcanize

Details Method for preventing degradation and deterioration of vulcanize Method for preventing degradation and deterioration of vulcanize

1984-06-07

1985-12-17

Henderson, Christopher A.

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

Synthetic resins

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

166243, 525338, 525339, 525352, 525387, C08F 1920, C08F 1900

Patent

active

045593906

ABSTRACT:
A method of preventing degradation of vulcanized rubber materials used in the operation of oil and gas wells comprising forming said rubber material from a sulfur vulcanized composition comprising a copolymer rubber having in the polymer chain (I) 10 to 60% by weight of a unit from an unsaturated nitrile, (II) not more than 10% by weight of a unit from a conjugated diene, and (III) 30 to 90% by weight of a unit from an ethylenically unsaturated monomer other than the unsaturated nitrile and/or a unit resulting from the hydrogenation of a unit from a conjugated diene, said rubber being vulcanized with a sulfur vulcanization system.

REFERENCES:
patent: 3868354 (1975-02-01), Halasa
patent: 3872072 (1975-03-01), Halasa
patent: 3882094 (1975-05-01), Halasa
patent: 4337329 (1982-06-01), Kubo
patent: 4350796 (1982-09-01), Oyama
patent: 4384081 (1983-05-01), Kubo
patent: 4404329 (1983-09-01), Maeda
patent: 4405756 (1983-09-01), Oyama

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