CPC C10M 145/14 (2013.01) [C10M 129/06 (2013.01); C10M 169/044 (2013.01); C10M 2207/021 (2013.01); C10M 2209/084 (2013.01); C10N 2020/02 (2013.01); C10N 2020/04 (2013.01); C10N 2030/02 (2013.01); C10N 2030/18 (2013.01); C10N 2030/54 (2020.05)] | 6 Claims |
1. A viscosity index improver composition, comprising:
a (co)polymer (A) comprising a monomer (a) represented by the following formula (1) as an essential monomer;
a C18-C40 chain aliphatic alcohol (B); and
a base oil,
![]() wherein R1 is a hydrogen atom or a methyl group; —X1— is a group represented by —O— or —NH—; R2 is a C2-C4 alkylene group; R3 and R4 are each independently a C8-C24 linear or branched alkyl group; and p is an integer of 0 to 20, with each R2 being optionally the same as or different from each other when p is 2 or greater.
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