Patent ID: 6436881
Filing Date: 2002-08-20
Classification: C10M,C10N

Abstract:
A synthetic polyol ester based lubricant, comprising(A) a polyol ester base stock that is the reaction product of: (i) a polyol mixture including a major proportion of dipentaerythritol, and (ii) a mixture of C5 to C12 monocarboxylic acids, said mixture including: (a) from about 25-50 weight percent of linear C7 to C8-10 acids, and (b) from about 50-75 weight percent iso-C9 acid; wherein the resulting mixture of esters has a viscosity at 40Â° C. of at least about 120 cSt,;(B) a viscosity index improver effective to increase the viscosity of the base stock at 40Â° C. to about 240 to 300 cSt; and (C) an additive package including, between about 3-8 weight percent antioxidant, between about 1-4 weight percent extreme pressure/anti-wear agents and a minor effective amount of a corrosion inhibitor; to yield a lubricant having a density at 15.6Â° F. of about 8.0 to 8.25 lbs./gal., a total acid number of about 0.01 to 0.15, a pour point of about âˆ’31Â° C. and a flash point of about 285Â° C. and a viscosity at 40Â° C. of about 270 to 330 cSt.