Preparing NBR rubber seal products with phosphite and phosphate

Details Preparing NBR rubber seal products with phosphite and phosphate Preparing NBR rubber seal products with phosphite and phosphate

1997-12-08

2000-12-19

Wu, David W.

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

Synthetic resins

Processes of preparing a desired or intentional composition...

524147, 524565, 524571, 5253325, C08K 5521, C08K 5526, C08K 5527, C08L 902

Patent

active

061628476

ABSTRACT:
A method for preparing a rubber seal product of a type which contacts a metal surface for sealing thereof, comprising the steps of: preparing a rubber composition comprising acrylonitrile butadiene rubber (NBR), (A) a carbocyclic phosphite compound represented by the general formula ##STR1## where R is an alkyl group having 8 to 24 carbon atoms, or a phenyl group having a mono-, di- or tri-substituted alkyl group having 1 to 10 carbon atoms, and (B) an acid phosphate compound represented by the general formula ##STR2## where R' is a hydrogen atom, or an alkyl group having 1 to 13 carbon atoms, and R" is an alkyl group having 1 to 13 carbon atoms, the phosphate compound having an acid number of about 150 to 800 KOH mg/g; wherein a total of about 5 to 20 parts by weight of compound (A) and compound (B) are present in the composition based on 100 parts by weight of NBR, vulcanizing the rubber composition to obtain a vulcanized rubber composition; and compressing the vulcanized rubber composition toward a metal surface.

REFERENCES:
patent: 4332918 (1982-06-01), Fukahori et al.
patent: 4994508 (1991-02-01), Shiraki et al.
patent: 5362787 (1994-11-01), Ngoc et al.
patent: 5364899 (1994-11-01), Watanabe et al.

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