Patent ID: 6232279
Filing Date: 2001-05-15
Classification: C10M,C10N

Abstract:
A lubricant composition having a kinematic viscosity at 100.degree. C. (ASTM D 445) of less than 12.5 mm.sup.2 /s and a high temperature, high shear dynamic viscosity at a temperature of 150.degree. C. and a shear rate of 10.sup.6 /s (ASTM D 4741) of at least 2.9 mPa.s, which composition comprises, or is formulated from blending:(a) from 70 to 99.5 wt. % base oil having a kinematic viscosity at 100.degree. C. of from 2 to 8 mm.sup.2 /s and a viscosity index of at least 120; and(b) from 0.5 to 3 wt. % alkenylarene-conjugated diene block copolymer as a viscosity index improver, said block copolymer formed of blocks consisting of alkenylarene homopolymer and blocks consisting of alkenylarene-conjugated diene copolymer,the weight percents being based on the total weight of the composition.