Viscosity index improver composition and lubricating oil composition

Patent metadata

Field	Value
Publication number	US-12168756-B2
Application number	US-202118021222-A
Country	US
Kind code	B2
Filing date	Aug 20, 2021
Priority date	Aug 20, 2020
Publication date	Dec 17, 2024
Grant date	Dec 17, 2024

Abstract

The present invention aims to provide a viscosity index improver composition capable of providing a lubricant composition that has an excellent viscosity index improving effect, excellent antifoaming properties, and excellent persistence of the antifoaming properties. The present invention relates to a viscosity index improver composition, containing: a (co)polymer (A) containing a monomer (a) represented by the following formula (1) as an essential monomer; a C18-C40 chain aliphatic alcohol (B); and a base oil,
[Chem. 1]

wherein R 1 is a hydrogen atom or a methyl group; —X 1 — is a group represented by —O— or —NH—; R 2 is a C2-C4 alkylene group; R 3 and R 4 are each independently a C8-C24 linear or branched alkyl group; and p is an integer of 0 to 20, with each R 2 being optionally the same as or different from each other when p is 2 or greater.

First claim

The invention claimed is:

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 R 1 is a hydrogen atom or a methyl group; —X 1 — is a group represented by —O— or —NH—; R 2 is a C2-C4 alkylene group; R 3 and R 4 are each independently a C8-C24 linear or branched alkyl group; and p is an integer of 0 to 20, with each R 2 being optionally the same as or different from each other when p is 2 or greater.

2. The viscosity index improver composition according to claim 1 ,
wherein the (co)polymer (A) is a copolymer further comprising a (meth)acrylic acid alkyl ester (b) having a C1-C4 alkyl group, as a constituent monomer.

3. The viscosity index improver composition according to claim 1 ,
wherein the (co)polymer (A) has a weight average molecular weight of 5,000 to 2,000,000.

4. The viscosity index improver composition according to claim 1 ,
wherein a weight ratio (A/B) of the (co)polymer (A) to the chain aliphatic alcohol (B) is 10 to 10,000.

5. The viscosity index improver composition according to claim 1 ,
wherein the base oil has a kinematic viscosity at 100° C. of 1 to 15 mm 2 /s and a viscosity index of 90 or higher.

6. A lubricant composition, comprising:
the viscosity index improver composition according to claim 1 ; and
at least one additive selected from the group consisting of a detergent, a dispersant, an antioxidant, an oiliness improver, a pour point depressant, a friction and wear modifier, an extreme pressure agent, a demulsifier, a metal deactivator, and a corrosion inhibitor.

Assignees

• Sanyo Chemical Ind Ltd

Inventors

• Naito Nobuhiro
• Yamashita Hiroki
• Yoshida Kenyuu
• Hagihara Hiroki

Classifications

• C10N2030/18

  Anti-foaming property · CPC title

• C10N2030/02

  Pour-point; Viscosity index · CPC title

• C10N2020/04

  Molecular weight; Molecular weight distribution · CPC title

• C10N2020/02

  Viscosity; Viscosity index · CPC title

• C10M2209/084

  Acrylate; Methacrylate · CPC title