Biodegradable seal swell additive with low toxicity...

Details Biodegradable seal swell additive with low toxicity... Biodegradable seal swell additive with low toxicity...

C - Chemistry, Metallurgy

09

K

253/119

C09K 3/00 (2006.01) C10M 1/26 (1980.01)

Patent

CA 1063091

ABSTRACT A method for reducing leakage of fluid in an automatic transmission having rubber-type seals subject to deterioration which comprises employing an automatic transmission fluid comprising from about 70 to 95 volume percent of mineral lubricating oil, and from about 0.1 to 5 volume percent of a seal swell additive which is from 70 to 100 volume percent of an oil soluble, aromatic hydrocarbon ester of 10 to 60 carbon atoms and 2 to 3 ester linkages, said ester being the reaction product of an aliphatic alcohol having from 1 to 13 carbon atoms and an aromatic polycarboxylic acid having 2 to 3 carboxylic acid groups, and 30-0 volume percent of an aliphatic alcohol having 8 to 13 carbon atoms, said additive having the property of swelling said seals to thereby prevent leakage. The ester alone and ester-alcohol combination imparts to the fluid the property of swelling seals in automatic transmissions, power transmissions and rotary engines and thereby improves retention of the fluid in these mechanical structures.

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