Copolymer and lubricating oil composition

Patent metadata

Field	Value
Publication number	US-2018201864-A1
Application number	US-201615755254-A
Country	US
Kind code	A1
Filing date	Aug 29, 2016
Priority date	Aug 31, 2015
Publication date	Jul 19, 2018
Grant date	—

Abstract

The present invention addresses the problem of providing a lubricating oil composition having excellent heat resistance (suppression of discoloration in heating) and tackiness while maintaining excellent viscosity properties of a lubricating oil composition using a ricinolic acid polymer. The present invention provides a copolymer (B) containing structural units (a) derived from ricinolic acid, structural units (b) derived from an aliphatic dicarboxylic acid and structural units (c) derived from a diol having 2 to 10 carbon atoms in a specific ratio and having a specific intrinsic viscosity, and provides a lubricating oil composition containing a base oil and the copolymer (B) and having a mass ratio (mass of (A) /mass of (B)) of the base oil (A) to the copolymer (B) of 60/40 to 99.5/0.5.

First claim

1 . A copolymer (B) satisfying the following requirements (B1) to (B3):
(B1) the copolymer (B) comprises structural units (a) derived from ricinolic acid, structural units (b) derived from an aliphatic dicarboxylic acid, and structural units (c) derived from a diol having 2 to 10 carbon atoms; (B2) when the total of the structural units (a), (b) and (c) is 100% by mol, the content of the structural units (a) is 20 to 90% by mol, the content of the structural units (b) is 5 to 40% by mol, and the content of the structural units (c) is 5 to 40% by mol; and (B3) the copolymer (B) has an intrinsic viscosity [IV] of in the range of 0.1 to 2.0 dl/g.

2 . A lubricating oil composition comprising a base oil (A) and the copolymer (B) according to claim 1 and having a mass ratio (mass of (A)/mass of (B)) of the base oil (A) to the copolymer (B) of 60/40 to 99.5/0.5.

3 . The lubricating oil composition according to claim 2 , wherein the base oil (A) is a vegetable oil and/or a synthetic ester.

4 . The lubricating oil composition according to claim 3 , wherein the synthetic ester is a diester or a polyol ester.

5 . The lubricating oil composition according to claim 3 , or wherein the synthetic ester is an aliphatic diester or an aliphatic polyol ester.

6 . The lubricating oil composition according to claim 2 , wherein in the requirement (B2), a molar ratio ((b)/(c)) of the structural units (b) to the structural units (c) is 0.9 to 1.1.

7 . The lubricating oil composition according to claim 2 , wherein in the requirement (B2), the content of the structural units (a) is 40 to 90% by mol.

8 . The lubricating oil composition according to claim 2 , wherein in the requirement (B3), the intrinsic viscosity [IV] is in the range of 0.3 to 1.5 dl/g.

9 . The lubricating oil composition according to claim 2 , further comprising at least one additive (C) selected from the group consisting of an antioxidant, an extreme pressure agent, a rust preventive, a metal deactivator, an antiwear additive, an antifoaming agent, a detergent dispersant and a pour point depressant.

10 . The lubricating oil composition according to claim 2 , wherein the aliphatic dicarboxylic acid is sebacic acid.

11 . The lubricating oil composition according to claim 2 , wherein the diol having 2 to 10 carbon atoms is 1,4-butanediol.

12 . A gear oil composed of the lubricating oil composition according to claim 2 .

13 . A hydraulic oil composed of the lubricating oil composition according to claim 2 .

14 . An engine oil composed of the lubricating oil composition according to claim 2 .

15 . A grease composed of the lubricating oil composition according to claim 2 .

16 . A machining oil composed of the lubricating oil composition according to claim 2 .

Assignees

• Mitsui Chemicals Inc

Inventors

• Kida Mariko
• Ebata Hiroki
• Kaneshige Ryousuke

Classifications

• C10N2030/20

  Colour, e.g. dyes · CPC title

• C10N2030/58

  Elastohydrodynamic lubrication, e.g. for high compressibility layers · CPC title

• C10N2040/08

  Hydraulic fluids, e.g. brake-fluids · CPC title

• C10N2040/20

  Metal working · CPC title

• C10M129/78

  Complex esters, i.e. compounds containing at least three esterified carboxyl groups and derived from the combination of at least three different types of the following five types of compound: monohydroxy compounds, polyhydroxy compounds, monocarboxylic acids, polycarboxylic acids, hydroxy carboxylic acids · CPC title