Elastomer compatible seal swell additive for automatic...

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

C - Chemistry, Metallurgy

10

M

253/136

C10M 141/10 (2006.01)

Patent

CA 1083129

ABSTRACT OF DISCLOSURE A fluid having a mineral lubricating oil base and containing the combination of an oil-soluble tris (C8-C24 hydrocarbyl) phosphite ester and an oil-soluble C8-C24 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°C., to 200°C. is present.

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