Patent ID: 8419968

Claim:
A polyol ester suitable for use as a lubricant or a lubricant base stock, the ester having a kinematic viscosity at 40° C. less than or equal to 22 cSt and a viscosity index of greater than or equal to 140 and the ester comprising a reaction product of (a) at least one polyhydric alcohol having at least 2 primary hydroxyl groups selected from pentaerythritol, dipentaerythritol, tripentaerythritol, tetrapentaerythritol, trimethylolpropane, trimethylolethane, neopentyl glycol and mixtures thereof, (b) at least one monocarboxylic acid having 2 to 15 carbon atoms wherein from about 25 mole % to about 100 mole % of the at least one monocarboxylic acid, based on total moles of monocarboxylic acid, is one or more linear monocarboxylic acids, and (c) at least one polycarboxylic acid having 2 to 15 carbon atoms, wherein the number of acid groups derived from the polycarboxylic acid(s) is 25 to 50% of the total number of acid groups derived from the monocarboxylic and polycarboxylic acids.