Lubricant composition

Patent metadata

Field	Value
Publication number	US-2024110121-A1
Application number	US-202218263924-A
Country	US
Kind code	A1
Filing date	Feb 4, 2022
Priority date	Feb 5, 2021
Publication date	Apr 4, 2024
Grant date	—

Abstract

A lubricating oil composition containing a base oil (A), a molybdenum-based friction modifier (B), a metal-based detergent (C), and a dispersant (D), in which the dispersant (D) contains a non-boron-modified polyisobutenyl succinic bisimide (D1). The IR spectrum of the non-boron-modified polyisobutenyl succinic bisimide (D1) is determined by an FT-IR method, having a ratio [Abs (1705 cm −1 )/Abs (1390 cm −1 )] of a peak intensity Abs (1705 cm −1 ) at 1705 cm −1 to a peak intensity Abs (1390 cm −1 ) at 1390 cm −1 is 7.5 or less. A content of the non-boron-modified polyisobutenyl succinic bisimide (D1) is 50 mass % or more based on a total amount of the dispersant (D), and contains a kinematic viscosity at 100° C. is 9.3 mm 2 /s or less. The lubricating oil composition has an excellent effect of reducing a friction coefficient while containing a molybdenum-based friction modifier and a succinimide compound.

First claim

1 : A lubricating oil composition comprising:
a base oil (A); a molybdenum-based friction modifier (B); a metal-based detergent (C); and a dispersant (D), wherein the dispersant (D) contains a non-boron-modified polyisobutenyl succinic bisimide (D1), a ratio [Abs (1705 cm −1 )/Abs (1390 cm −1 )] of a peak intensity Abs (1705 cm −1 ) at 1705 cm −1 to a peak intensity Abs (1390 cm −1 ) at 1390 cm −1 is 7.5 or less, in an IR spectrum of the non-boron-modified polyisobutenyl succinic bisimide (D1) as determined by an FT-IR method, a content of the non-boron-modified polyisobutenyl succinic bisimide (D1) is 50 mass % or more based on a total amount (100 mass %) of the dispersant (D), and a kinematic viscosity at 100° C. is 9.3 mm 2 /s or less.

2 : The lubricating oil composition according to claim 1 , wherein a content of a molybdenum atom derived from the molybdenum-based friction modifier (B) is 0.04 mass % or more and 0.10 mass % or less based on a total amount (100 mass %) of the lubricating oil composition.

3 : The lubricating oil composition according to claim 1 , wherein a ratio [(D1)/(B)-Mo] of a content of the non-boron-modified polyisobutenyl succinic bisimide (D1) to the content of the molybdenum atom derived from the molybdenum-based friction modifier (B) is 20 or more and 80 or less in mass ratio.

4 : The lubricating oil composition according to claim 1 , wherein a sulfated ash content is 0.8 mass % or less.

5 : The lubricating oil composition according to claim 1 , wherein when a metal atom contained in the metal-based detergent (C) is calcium, a content of a calcium atom derived from the metal-based detergent (C) is 0.50 mass % or less based on the total amount (100 mass %) of the lubricating oil composition.

6 : The lubricating oil composition according to claim 1 , wherein when the metal atom contained in the metal-based detergent (C) is magnesium, a content of a magnesium atom derived from the metal-based detergent (C) is 0.070 mass % or less based on the total amount (100 mass %) of the lubricating oil composition.

7 : The lubricating oil composition according to claim 1 , wherein when the dispersant (D) contains a boron-modified succinimide (D3), a content of a boron atom derived from the boron-modified succinimide (D3) is 0.03 mass % or less based on the total amount (100 mass %) of the lubricating oil composition.

8 : The lubricating oil composition according to claim 1 , wherein a content of a nitrogen atom derived from the total dispersant (D) is 0.10 mass % or less based on the total amount (100 mass %) of the lubricating oil composition.

9 : The lubricating oil composition according to claim 1 , which is suitable for an internal combustion engine.

10 : A method for producing a lubricating oil composition, comprising:
mixing a base oil (A), a molybdenum-based friction modifier (B), a metal-based detergent (C), and a dispersant (D),
wherein the dispersant (D) contains a non-boron-modified polyisobutenyl succinic bisimide (D1),
a ratio [Abs (1705 cm −1 )/Abs (1390 cm −1 )] of a peak intensity Abs (1705 cm −1 ) at 1705 cm −1 to a peak intensity Abs (1390 cm −1 ) at 1390 cm −1 is 7.5 or less, in an IR spectrum of the non-boron-modified polyisobutenyl succinic bisimide (D1) as determined by an FT-IR method, and
a content of the non-boron-modified polyisobutenyl succinic bisimide (D1) is 50 mass % or more based on a total amount (100 mass %) of the dispersant (D), and a kinematic viscosity at 100° C. is 9.3 mm 2 /s or less.

Assignees

• Idemitsu Kosan Co

Inventors

• Sunahara Kenji
• Yamashita Jun
• Kubota Masaya
• Fujita Shoichiro

Classifications

• C10M133/56 Primary

  Amides; Imides · CPC title

• C10M101/00

  Lubricating compositions characterised by the base-material being a mineral or fatty oil (containing more than 10% water C10M173/00) · CPC title

• C10M125/04

  Metals; Alloys · CPC title

• C10M139/06

  having a metal-to-carbon bond (metal complexes of unknown constitution C10M159/18) · CPC title

• C10M149/18

  Polyamides · CPC title