Synthetic lubricant base stock of monopentaerythritol and trimethylolpropane esters
AssigneeHatco Chemical Corporation
InventorsDale D. Carr, Nicholas DeGeorge, deceased
Life of this patent
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Abstract
An improved synthetic ester lubricant base stock formed by reacting at least one of trimethylolpropane and monopentaerythritol with a mixture of aliphatic monocarboxylic acids is provided. The mixture of acids including straight-chain acids having from 5 to 10 carbon atoms and an iso-acid having from 6 to 10 carbon atoms, preferably iso-nonanoic acid. The base stock is mixed with a conventional ester lubricant additive package to form a lubricant having a viscosity at 210.degree. F. of at leasts 5.0 centistokes and pour point of at least as low as -65.degree. F. The resulting lubricants have a decreased tendency to form deposits in gas turbine engines.
Claims19
A synthetic ester lubricant base stock, consisting essentially of the reaction product of:
- a polyol selected from the group consisting of monopentaerythritol having a melting point of 255.degree.-259.degree. C., trimethylolpropane and mixtures thereof;
- and
- an acid mixture including (1) at least one straight-chain acid having between about 5 and 10 carbon atoms and (2) an iso-acid selected from the group consisting of iso-C.sub.7 acid, iso-C.sub.8 acid, iso-C.sub.9 acid, iso-C.sub.10 acid and mixtures thereof;
- wherein the resulting mixture of esters has a viscosity at 210.degree. F. of at least about 4.8 centistokes, a viscosity at -40.degree. F. of less than about 13,000 centistokes and a pour point of at least as low as -65.degree. F.
A synthetic ester lubricant base stock consisting essentially of the reaction product of:
- a polyol mixture consisting of monopentaerythritol having a melting point of 255.degree.-259.degree. C. and trimethylolpropane,
- a mixture of monocarboxylic acids including (1) straight-chain acids having from 5 to 10 carbon atoms and (2) isononanoic acid, and
- the resulting ester having a viscosity at 210.degree. F. of at least about 4.8 centistokes, a viscosity at -40.degree. F. of less than about 13,000 centistokes and a pour point of at least as low as -65.degree. F.
Dependencies are inferred from the claim text.