Lubricating oil composition for internal combustion engines of passenger and commercial four-wheeled vehicles

Patent metadata

Field	Value
Publication number	US-2016289591-A1
Application number	US-201615183062-A
Country	US
Kind code	A1
Filing date	Jun 15, 2016
Priority date	Dec 16, 2013
Publication date	Oct 6, 2016
Grant date	—

Abstract

A lubricating oil composition for internal combustion engines of passenger and commercial four-wheeled vehicles is provided which can exhibit excellent fuel efficiency performance and wear resistance reliability. The lubricating oil composition includes a base oil and a complex polyester mixture. The base oil includes at least one of poly-α-olefin, an ester-based base oil, or a partially hydrogenated mineral oil. The complex polyester mixture includes a polyester obtained by condensing a polyhydric alcohol, a polycarboxylic acid, and a monohydric alcohol having an oxyalkylene group. The content of the complex polyester mixture is 0.01% by mass or more with respect to the total mass of the lubricating oil composition, the high-temperature shear viscosity (HTHS viscosity) at 150° C. is 1.0 mPa·s to 2.6 mPa·s, and the NOACK evaporation amount is 40% or less.

First claim

What is claimed is:

1 . A lubricating oil composition for internal combustion engines of passenger and commercial four-wheeled vehicles comprising:
a base oil; and a complex polyester mixture, wherein the base oil includes at least one of poly-α-olefin, an ester-based base oil, or a partially hydrogenated mineral oil, the complex polyester mixture includes a polyester obtained by condensing a polyhydric alcohol having at least two hydroxyl groups, a polycarboxylic acid including at least two carboxyl groups, and a monohydric alcohol having at least one oxyalkylene group, the content of the complex polyester mixture is 0.01% by mass or more with respect to the total mass of the lubricating oil composition for internal combustion engines, the HTHS viscosity of the lubricating oil composition for internal combustion engines, which is high-temperature shear viscosity at 150° C., is 1.0 mPa·s to 2.6 mPa·s, and the NOACK evaporation amount is 40% or less.

2 . The lubricating oil composition for internal combustion engines according to claim 1 ,
wherein the content of the complex polyester mixture is 0.01% by mass to 20% by mass with respect to the total mass of the lubricating oil composition for internal combustion engines.

3 . The lubricating oil composition for internal combustion engines according to claim 1 ,
wherein the number of carbon atoms in the polycarboxylic acid is 7 or more and the number of carbon atoms in the monohydric alcohol is 3 or more.

4 . The lubricating oil composition for internal combustion engines according to claim 1 ,
wherein the polyhydric alcohol includes three or more hydroxyl groups.

5 . The lubricating oil composition for internal combustion engines according to claim 1 ,
wherein the polyhydric alcohol is selected from pentaerythritol, trimethylolpropane, glycerin and dipentaerythritol.

6 . The lubricating oil composition for internal combustion engines according to claim 1 ,
wherein the number of carbon atoms in the polycarboxylic acid is 24 to 54.

7 . The lubricating oil composition for internal combustion engines according to claim 6 ,
wherein the content of the complex polyester mixture is 0.1% by mass to 25% by mass with respect to the total mass of the lubricating oil composition for internal combustion engines.

8 . The lubricating oil composition for internal combustion engines according to claim 1 ,
wherein the number of carbons in the monohydric alcohol is 6 or more.

9 . The lubricating oil composition for internal combustion engines according to claim 1 ,
wherein the monohydric alcohol is represented by the following Formula (1):
R a O(CX a1 X a2 ) na1  na2 OH   Formula (1)

wherein, in the Formula (1), R a represents an alkyl group which may have a substituent, a cycloalkyl group which may have a substituent, an alkenyl group which may have a substituent, an aryl group which may have a substituent, or a heteroaryl group which may have a substituent, X a1 and X a2 each independently represent a hydrogen atom, a halogen atom, or an alkyl group, na1 represents an integer of 1 to 4, na2 represents an integer of 1 to 12, in the case in which na1 is 2 or greater, na1 X a1 s may be the same or different from each other, na1 X a2 s may be the same or different from each other, and in the case in which na2 is 2 or greater, na2 —O(CX a1 X a2 ) na1 -s may be the same or different from each other.

10 . The lubricating oil composition for internal combustion engines according to claim 1 ,
wherein the polyester is obtained by mixing the polycarboxylic acid, the polyhydric alcohol, and the monohydric alcohol such that the molar ratio of the polycarboxylic acid is 1 to 5 and the molar ratio of the monohydric alcohol is 0.5 to 5 with respect to the polyhydric alcohol and condensing the mixture.

11 . The lubricating oil composition for internal combustion engines according to claim 1 ,
wherein the polyester is obtained by mixing the polycarboxylic acid, the polyhydric alcohol, and the monohydric alcohol such that the molar ratio of the polycarboxylic acid is 2.2 to 5 and the molar ratio of the monohydric alcohol is 2.5 to 5 with respect to the polyhydric alcohol and condensing the mixture.

12 . The lubricating oil composition for internal combustion engines according to claim 1 ,
wherein the monohydric alcohol is represented by the following Formula (1-1):

wherein, in the Formula (1-1), x represents an integer of 4 to 9, y represents an integer of 2 to 9, z represents 2 or 3, p represents 1 or 2, and in the case in which p is 2 or greater, p —(OC z H 2z )-s may be the same or different from each other.

13 . The lubricating oil composition for internal combustion engines according to claim 1 , further comprising:
an organic metal compound, wherein the content of the organic metal compound is 0.001% by mass to 0.4% by mass with respect to the lubricating oil composition for internal combustion engines.

Assignees

• Fujifilm Corp
• Toyota Motor Co Ltd

Inventors

• Fujiwara Toshiki
• Suzuki Hiroyuki
• Watanabe Saisuke
• Fukutomi Ippei
• Murakami Motoichi
• Suzuki Tetsushi

Classifications

• C10M2223/045

  Metal containing thio derivatives · CPC title

• C10N2060/02

  Reduction, e.g. hydrogenation · CPC title

• C10M2207/2835

  used as base material · CPC title

• C10N2030/54

  Fuel economy · CPC title

• C10M2223/043

  Ammonium or amine salts thereof · CPC title