| abstract |
TITLE OF INVENTION POLYMER COMPOSITION USEFUL AS VISCOSITY INDEX IMPROVER ABSTRACT OF THE DISCLOSURE A polymer composition or concentrate comprising : (A) an olefinic copolymer, (B) a copolymer of olefins with a (meth)acrylate, (C) a poly(meth)acrylate, and (D) a surfactant, which is poor solvent for both the components (A) and (C), and acts as a solubilizer or phase-stabilizer for the components (A) and (C), in combination with surface activity of the component (B) as a phase-stabilizer has lower viscosity even at high polymer content and is useful as a lubricating oil additive for improving the viscosity index. |