VISCOSITY INDEX IMPROVER AND LUBRICATING OIL COMPOSITION

WIPO Patent Application WO/2022/054957

A1

A purpose of the present invention is to provide a viscosity index improver having an excellent friction reducing effect on a lubricating oil composition to which the viscosity index improver has been added, and a lubricating oil composition containing the same. The present invention relates to a viscosity index improver, etc. containing a (co)polymer (A) including a polyolefin monomer (a) represented by general formula (1) as an essential structural monomer, an ester oil (B1) having a 100°C kinematic viscosity of 1.00-2.50 mm2/s, and an ester oil (B2) having a 100°C kinematic viscosity of 2.51-5.00 mm2/s. [In general formula (1), R1 is a hydrogen atom or a methyl group; -X1- is a group represented by -O-, -O(AO)m-, or -NH-, in which A is a C2-4 alkylene group, m is an integer of 1-10, and A may be the same or different when m is 2 or higher; R2 is a residue obtained by removing one hydrogen atom from a hydrocarbon polymer including a 1,2-butylene group as a structural unit; and p is a number of 0 or 1.]

NAITO NOBUHIRO (JP)
MATSUMOTO SATOSHI (JP)
HASHIMOTO MASAHIRO (JP)
YOSHIDA KENYUU (JP)
YAMASHITA HIROKI (JP)
SATO RYOTA (JP)

PCT/JP2021/033641

March 17, 2022

September 14, 2021

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SANYO CHEMICAL IND LTD (JP)

C08F290/04; C08K5/103; C08L55/00; C08L91/00; C09K3/00; C10M145/14; C10M101/02; C10M105/32; C10N20/02; C10N40/04; C10N40/06; C10N40/08; C10N40/25

JP2012529550A	2012-11-22
JP2019532134A	2019-11-07
JP2017171899A	2017-09-28
JP2017110196A	2017-06-22
JP2019151766A	2019-09-12
JP2019156953A	2019-09-19
JP2017057378A	2017-03-23
JP2018048328A	2018-03-29
JP2017106017A	2017-06-15

YASUTOMI & ASSOCIATES (JP)

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