LUBRICATING OIL COMPOSITION FOR INTERNAL COMBUSTION ENGINE

• US 20150210954A1
• Filed: 07/02/2013
• Published: 07/30/2015
• Est. Priority Date: 07/13/2012
• Status: Abandoned Application

• Current Assignee: JX Nippon Oil & Energy Corporation (ENEOS Holdings, Inc.)
• Original Assignee: JX Nippon Oil & Energy Corporation (ENEOS Holdings, Inc.)
• Inventors: Miyamoto, Hiroya
• Application Number:
  US14/414,126
• Publication Number:
  US 20150210954A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: C10M 161/00 Lubricating compositions characterised by the additive being a mixture of a macromolecular compound and a non-macromolecular compound, each of these compounds being essential
• CPC Class Codes: C10M 169/04 Mixtures of base-materials and additives
• CPC Class Codes: C10M 2207/026 with tertiary alkyl groups
• CPC Class Codes: C10M 2207/226 used as thickening agents
• CPC Class Codes: C10M 2209/084 Acrylate; Methacrylate
• CPC Class Codes: C10M 2215/28 Amides; Imides
• CPC Class Codes: C10M 2219/068 Thiocarbamate metal salts
• CPC Class Codes: C10M 2223/045 Metal containing thio derivatives
• CPC Class Codes: C10M 2229/041 containing aliphatic substituents
• CPC Class Codes: C10N 2010/04 Groups 2 or 12
• CPC Class Codes: C10N 2010/12 Groups 6 or 16
• CPC Class Codes: C10N 2020/02 Viscosity; Viscosity index
• CPC Class Codes: C10N 2020/04 Molecular weight; Molecular weight distribution
• CPC Class Codes: C10N 2030/02 Pour-point; Viscosity index
• CPC Class Codes: C10N 2030/04 Detergent property or dispersant property
• CPC Class Codes: C10N 2030/54 Fuel economy
• CPC Class Codes: C10N 2040/25 Internal-combustion engines
• CPC Class Codes: C10N 2040/252 Diesel engines
• CPC Class Codes: C10N 2040/255 Gasoline engines
• CPC Class Codes: C10N 2060/14 by boron or a compound containing boron

Abstract

A lubricating oil composition is provided as an engine oil for an internal combustion engine employing heat management. The composition includes (A) a base oil having 100° C. kinematic viscosity of 3.0 to 5.0 mm²/s, (B) a boronated succinimide in an amount of 0.007 mass percent or more as boron and in an amount of 5 mass percent or less as the succinimide ashless dispersant, based on total mass of the composition, (C) a phenol-based antioxidant in an amount of 0.5 mass percent or more, and (D) a viscosity index improver having a ratio of weight average molecular weight and PSSI of 1.2×104 or greater in an amount of 0.1 to 5 percent by mass. The composition has a 150° C. HTHS viscosity of 2.0 to 2.8 mPa·s, a 100° C. HTHS viscosity of 4.8 mPa·s or lower and a viscosity index of 180 or greater.

Claims

1. A lubricating oil composition for an internal combustion engine, the composition comprising (A) a base oil having 100°

C. kinematic viscosity of 3.0 to 5.0 mm²/s, (B) a boronated succinimide in an amount of 0.007 percent by mass or more as boron and in an amount of 5 percent by mass or less as the succinimide ashless dispersant, on the basis of the total mass of the composition, (C) a phenol-based antioxidant in an amount of 0.5 percent by mass or more, and (D) a viscosity index improver having a ratio of weight average molecular weight and PSSI of 1.2×

104 or greater in an amount of 0.1 to 5 percent by mass, the composition having a 150°

C. HTHS viscosity of 2.0 to 2.8 mPa·

s, a 100°

C. HTHS viscosity of 4.8 mPa·

s or lower and a viscosity index of 180 or greater.

2. The lubricating oil composition for an internal combustion engine according to claim 1, wherein a ratio of the boronated succinimide to a non-boronated succinimide is from 1.0 to 3.0 by weight.

3. The lubricating oil composition for an internal combustion engine according to claim 1, wherein a ratio of a total content of the boronated succinimide and the non-boronated succinimide to a content of the viscosity index improver is 6 or less.

4. The lubricating oil composition for an internal combustion engine according to claim 2, wherein a ratio of a total content of the boronated succinimide and the non-boronated succinimide to a content of the viscosity index improver is 6 or less.