| abstract |
Viscosity index improver composition having excellent shear stability of lubricating oil composition, low HTHS viscosity of lubricating oil composition, difficult to increase low temperature viscosity of lubricating oil composition, and easy handling at atmospheric temperature Offer. A viscosity index improver composition comprising a polymer (A) having a monomer (a) represented by the general formula (1) as a constituent monomer and a base oil, A viscosity index improver composition having a value (V1) obtained by dividing the kinematic viscosity at 100 ° C by the kinematic viscosity at 100 ° C in the range of 0.2 to 5. [Selection figure] None |