Biodegradable branched synthetic ester base stocks and lubricants formed therefrom
December 8, 2015. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3360465 Automatic transmission fluid comprising esters derived from a particular monocarboxylic acid composition Drilling fluids containing an additive composition Process for continuously manufacturing lubricating grease Synthetic ester lubricating oil composition containing particular t-butylphenyl substituted phosphates and stabilized hydrolytically with particular long chain alkyl amines Hydraulic fluids Synthetic lubricant base stock of monopentaerythritol and trimethylolpropane esters High-viscosity, neutral polyol esters High temperature compressor oil Lubricating oil composition for 2 cycle or rotary engine InventorsAssigneeApplicationNo. 572131 filed on 12/08/1995US Classes:508/485, Esterified alcohol is polyhydroxy alcohol (e.g., pentaerythritol tetraalkanoate, etc.)508/501Chalcogen attached indirectly to the -C(=O)O-group by nonionic bonding (e.g., pentaerythritol monooleate, etc.)ExaminersPrimary: Willis, Prince Jr.Assistant: Toomer, Cephia D. Attorney, Agent or FirmForeign Patent References
International ClassesC10M 129/70C10M 129/74 AbstractA biodegradable lubricant which is prepared from: about 60-99% by weight of at least one biodegradable synthetic ester base stock which comprises the reaction product of: a branched or linear alcohol having the general formula R(OH)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 mixed acids comprising about 30 to 80 molar % of a linear acid having a carbon number in the range between about C5 to C12, and about 20 to 70 molar % of at least one branched acid having a carbon number in the range between about C5 to C10 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 has an oxygen to carbon ratio of between about 0.15:1 to 0.3:1 and 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° C.; a viscosity of less than 7500 cps at -25° C.; and oxidative stability of up to 45 minutes as measured by HPDSC.Other References
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