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Abstract

The present invention describes a polymer useful as viscosity index improver comprising units derived from one or more ethylenically unsaturated ester compounds of formula (I), where R is hydrogen or methyl, R¹ means a linear, branched or cyclic alkyl residue with 1-6 carbon atoms, R² and R³ independently represent hydrogen or a group of the formula —COOR′, where R′ means hydrogen or a alkyl group with 1-6 carbon atoms, units of one or more ethylenically unsaturated ester compounds of formula (II), where R is hydrogen or methyl, R⁴ means a 2-alkyl branched alkyl residue with 12-18 carbon atoms, R⁵ and R⁶ independently are hydrogen or a group of the formula —COOR″, where R″ means hydrogen or an alkyl group with 12-18 carbon atoms, and units of one or more ethylenically unsaturated ester compounds of formula (III), where R is hydrogen or methyl, R⁷ means a linear alkyl residue with 12-24 carbon atoms, R⁸ and R⁹ independently are hydrogen or a group of the formula —COOR″, where R″ means hydrogen or an alkyl group with 12-24 carbon atoms wherein said polymer comprises at least 10% by weight units derived from one or more ethylenically unsaturated ester compounds of formula (I), based on the total weight of the polymer, said polymer comprises at least 10% by weight units derived from one or more ethylenically unsaturated ester compounds of formula (II), based on the total weight of the polymer, and said polymer comprises at least 10% by weight units derived from one or more ethylenically unsaturated ester compounds of formula (III), based on the total weight of the polymer.

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First Claim