POLY(METH)ACRYLATE-BASED VISCOSITY INDEX IMPROVER, LUBRICANT ADDITIVE AND LUBRICANT COMPOSITION CONTAINING VISCOSITY INDEX IMPROVER

• US 20150203781A1
• Filed: 07/24/2013
• Published: 07/23/2015
• Est. Priority Date: 07/24/2012
• Status: Active Grant

• Current Assignee: ENEOS Corporation (ENEOS Holdings, Inc.)
• Original Assignee: JX Nippon Oil & Energy Corporation (ENEOS Holdings, Inc.)
• Inventors: Matsui, Shigeki, Miyamoto, Hiroya, Matsuda, Hiromitsu, Tagawa, Kazuo, Takagi, Akira, Ueno, Ryuichi
• Granted Patent: US 9,783,757 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: C10M 145/14 Acrylate; Methacrylate
• CPC Class Codes: C10M 2203/1025 used as base material
• CPC Class Codes: C10M 2207/289 containing free hydroxy groups
• CPC Class Codes: C10M 2209/084 Acrylate; Methacrylate
• CPC Class Codes: C10M 2215/064 Di- and triaryl amines
• CPC Class Codes: C10M 2215/28 Amides; Imides
• CPC Class Codes: C10M 2219/024 of esters, e.g. fats
• CPC Class Codes: C10M 2219/046 Overbasedsulfonic acid salts
• CPC Class Codes: C10M 2219/106 Thiadiazoles
• CPC Class Codes: C10M 2223/04 Phosphate esters
• CPC Class Codes: C10M 2223/045 Metal containing thio derivatives
• CPC Class Codes: C10N 2010/04 Groups 2 or 12
• CPC Class Codes: C10N 2020/02 Viscosity; Viscosity index
• CPC Class Codes: C10N 2020/04 Molecular weight; Molecular weight distribution
• CPC Class Codes: C10N 2020/073 Star shaped polymers
• CPC Class Codes: C10N 2030/02 Pour-point; Viscosity index
• CPC Class Codes: C10N 2030/06 Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
• CPC Class Codes: C10N 2030/54 Fuel economy
• CPC Class Codes: C10N 2030/68 Shear stability
• CPC Class Codes: C10N 2040/042 for automatic transmissions
• CPC Class Codes: C10N 2040/044 : for manual transmissions
• CPC Class Codes: C10N 2040/045 : for continuous variable transmission [CVT]
• CPC Class Codes: C10N 2040/25 : Internal-combustion engines

Abstract

The present invention provides a poly(meth)acrylate-based viscosity index improver comprising a core portion and three or more arm portions, wherein each of the arm portions consists of a polymer chain comprising a structural unit represented by the following formula (1), and one end of the polymer chain is bonded to the core portion, and wherein a weight-average molecular weight Mw is 100000 or more, and a ratio of the weight-average molecular weight Mw to a number average molecular weight Mn, Mw/Mn, is 1.6 or less.

• • [R¹ represents hydrogen or a methyl group, and R² represents a C1 to C36 alkyl group.]

Claims

1. A poly(meth)acrylate-based viscosity index improver comprising:

a core portion; and

three or more arm portions,

wherein each of the arm portions consists of a polymer chain comprising a structural unit represented by the following formula (1), and one end of the polymer chain is bonded to the core portion,

and wherein a weight-average molecular weight Mw is 100000 or more, and a ratio of the weight-average molecular weight Mw to a number average molecular weight Mn, Mw/Mn, is 1.6 or less.

3. A lubricating oil additive comprising the poly(meth)acrylate-based viscosity index improver according to claim 1.

4. A lubricating oil composition comprising:

a lubricating base oil; and

the poly(meth)acrylate-based viscosity index improver according to claim 1.

2. A poly(meth)acrylate-based viscosity index improver comprising:

a core portion; and

three or more arm portions,

wherein each of the arm portions consists of a polymer chain comprising a structural unit represented by the following formula (1), and one end of the polymer chain is bonded to the core portion,

and wherein a weight-average molecular weight Mw is less than 100000, and a ratio of the weight-average molecular weight Mw to a number average molecular weight Mn, Mw/Mn, is 1.6 or less.

5. A lubricating oil additive comprising the poly(meth)acrylate-based viscosity index improver according to claim 2.

6. A lubricating oil composition comprising:

a lubricating base oil; and

the poly(meth)acrylate-based viscosity index improver according to claim 2.