Elastomer compatible seal swell additive for automatic transmiss

Details Elastomer compatible seal swell additive for automatic transmiss Elastomer compatible seal swell additive for automatic transmiss

1977-07-08

1978-09-26

Pitlick, Harris A.

Compositions

Heat-exchange, low-freezing or pour point, or high boiling...

With leak-stopping agents

252 498, 252 785, C10M 146, C10M 120

Patent

active

041168771

ABSTRACT:
A fluid having a mineral lubricating oil base and containing the combination of an oil-soluble tris (C.sub.8 -C.sub.24 hydrocarbyl) phosphite ester and an oil-soluble C.sub.8 -C.sub.24 hydrocarbyl substituted phenol, the weight ratio of said phosphite to said phenol ranging from about 4:1 to 1:4, preferably 3:1 to 1:3 whereby elastomer compatibility of said fluid is enhanced. The phosphite ester-substituted phenol combination imparts to the fluid the property of maintaining the chemical and physical properties of seals under oxidizing condition in automatic transmissions, power transmissions and power steering systems and thereby improves retention of the fluid in these mechanical structures; preferably when at least an inhibitory amount of an anti-oxidant capable of trapping free radicals at temperatures above 65.degree. C., preferably 80 .degree. to 200.degree. C. is present.

REFERENCES:
patent: 3115463 (1963-12-01), Orloff et al.
patent: 3115464 (1963-12-01), Orloff et al.
patent: 3115465 (1963-12-01), Orloff et al.
patent: 3556999 (1971-01-01), Messina et al.

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