Biodegradable branched synthetic ester base stocks and lubricant

Details Biodegradable branched synthetic ester base stocks and lubricant Biodegradable branched synthetic ester base stocks and lubricant

1995-12-08

1997-10-28

Willis, Jr., Prince

Solid anti-friction devices, materials therefor, lubricant or se

Lubricants or separants for moving solid surfaces and...

Organic -co- compound

508492, 508501, C10M12970, C10M12974

Patent

active

056818009

ABSTRACT:
A biodegradable synthetic ester base stock which comprises a blend of the following base stocks: (A) the reaction product of: (1) a branched or linear alcohol having the general formula R(OH).sub.n, wherein R is an aliphatic or cyclo-aliphatic group having from about 2 to 20 carbon atoms and n is at least 2; and (2) mixed acids comprising about 30 to 80 molar % of a linear acid having a carbon number in the range between about C.sub.5 to C.sub.12, and about 20 to 70 molar % of at least one branched acid having a carbon number in the range between about C.sub.5 to C.sub.10 and wherein no more than 10% of the branched acids used to form the biodegradable synthetic ester base stock contains a quaternary carbon; wherein the ester base stock exhibits the following properties: at least 60% biodegradation in 28 days as measured by the Modified Sturm test, a pour point of less than -25.degree. C.; and a viscosity of less than 7500 cps at -25.degree. C.; and (B) another base stock having at least 60% biodegradation in 28 days as measured by the Modified Sturm test; whereby the blended product has a biodegradation in 28 days as measured by the Modified Sturm test which is greater than either (A) or (B) alone.

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Waal and Kenbeek, "Testing, Application, and Future Development of Environmentally Friendly, Ester Base Fluids", Journal of Synthetic Lubrication, vol. 10, No. 1, Apr. 1993, pp. 67-83.

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