Title:
VISCOSITY INDEX IMPROVING AGENT AND LUBRICATING OIL COMPOSITION
Document Type and Number:
WIPO Patent Application WO/2022/054956
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide: a viscosity index improving agent which, when added to a lubricating oil composition, makes it possible to provide a lubricating oil composition having a satisfactory gelatinization index, an excellent HTHS viscosity at 100℃, and excellent kinematic viscosity at 40℃; and a lubricating oil composition containing the viscosity index improving agent. The present invention relates to: a viscosity index improving agent comprising a copolymer (A) and an ester oil (Z), in which the copolymer (A) contains, as constituent monomers thereof, a polyolefin monomer (a) represented by general formula (1) and a monomer (b) represented by general formula (2) wherein R4 represents an alkyl group having 4 carbon atoms, and further contains, as a constituent monomer thereof, a monomer (c) represented by general formula (3) and/or a monomer (d) represented by general formula (2) wherein R4 represents an alkyl group having 2 to 3 carbon atoms; and others. [In general formula (1), R1 represents a hydrogen atom or a methyl group; -X1- represents a group represented by -O-, -O(AO)m- or -NH-, in which A represents an alkylene group having 2 to 4 carbon atoms, and m represents an integer of 1 to 10, in which, when m is 2 or more, a plurality of A's may be the same as or different from each other; R2 represents a residue having a structure such that one hydrogen atom is removed from a hydrocarbon polymer containing a 1,2-butylene group as a constituent unit; and p represents a numerical value of 0 or 1.] [In general formula (2), R3 represents a hydrogen atom or a methyl group; -X2- represents a group represented by -O- or -NH-; and R4 represents an alkyl group having 2 to 4 carbon atoms.] [In general formula (3), R5 represents a hydrogen atom or a methyl group; -X3- represents a group represented by -O- or -NH-; R6 represents an alkylene group having 2 to 4 carbon atoms; R7 represents an alkyl group having 1 to 8 carbon atoms; and r represents an integer of 1 to 20, in which, when r is 2 or more, a plurality of R6's may be the same as or different from each other.]
Inventors:
NAITO NOBUHIRO (JP)
MATSUMOTO SATOSHI (JP)
HASHIMOTO MASAHIRO (JP)
YOSHIDA KENYUU (JP)
YAMASHITA HIROKI (JP)
SATO RYOTA (JP)
MATSUMOTO SATOSHI (JP)
HASHIMOTO MASAHIRO (JP)
YOSHIDA KENYUU (JP)
YAMASHITA HIROKI (JP)
SATO RYOTA (JP)
Application Number:
PCT/JP2021/033640
Publication Date:
March 17, 2022
Filing Date:
September 14, 2021
Export Citation:
Assignee:
SANYO CHEMICAL IND LTD (JP)
International Classes:
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
Foreign References:
| 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 | |||
| JP2021014578A | 2021-02-12 |
Attorney, Agent or Firm:
YASUTOMI & ASSOCIATES (JP)
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