Poly(meth)acrylate-based viscosity index improver, lubricant additive and lubricant composition containing viscosity index improver

A viscosity index improvement, acrylate technology, used in lubricating compositions, additives, base materials, etc., can solve problems such as sintering and oil leakage, and achieve the effects of improving viscosity index, inhibiting viscosity increase, and reducing viscous resistance

Inactive Publication Date: 2015-03-11
JX NIPPON OIL & ENERGY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the viscosity of the lubricating oil for transmission is reduced, other problems such as oil leakage and burning may occur

Method used

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  • Poly(meth)acrylate-based viscosity index improver, lubricant additive and lubricant composition containing viscosity index improver
  • Poly(meth)acrylate-based viscosity index improver, lubricant additive and lubricant composition containing viscosity index improver
  • Poly(meth)acrylate-based viscosity index improver, lubricant additive and lubricant composition containing viscosity index improver

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0044] [First Embodiment: First Poly(meth)acrylate Viscosity Index Improver]

[0045]The poly(meth)acrylate-based viscosity index improver of the first embodiment has a core portion and three or more arm portions, and the arm portions are composed of a structural unit represented by the following general formula (1) and the following general formula A polymer chain of the structural unit shown in (2) is formed. The poly(meth)acrylate-based viscosity index improver has a weight-average molecular weight Mw (hereinafter, sometimes simply referred to as "Mw") of 100,000 or more, and the weight-average molecular weight Mw and the number-average molecular weight Mn (hereinafter, sometimes simply referred to as "Mn".) The ratio Mw / Mn (hereinafter, may be simply referred to as "Mw / Mn") is 1.6 or less.

[0046]

[0047] [In formula (1) and (2), R 1 represents hydrogen or methyl, R 2 represents a group represented by the following general formula (3), R 3 Represents an alkyl grou...

no. 2 approach

[0079] [Second Embodiment: Lubricating Oil Additive]

[0080] The lubricating oil additive according to the second embodiment of the present invention contains a poly(meth)acrylate viscosity index improver having a core portion and an arm portion comprising A polymer chain of the structural unit represented by the above general formula (1) and the structural unit represented by the above general formula (2) is formed and one end of the polymer chain is bonded to the core, and the poly(meth)acrylate viscosity index The weight average molecular weight Mw of the improver is 100,000 or more, and the ratio Mw / Mn of the weight average molecular weight Mw to the number average molecular weight Mn is 1.6 or less. It should be noted that the poly(meth)acrylate-based viscosity index improver in this embodiment is the same as the viscosity index improver in the above-mentioned first embodiment, and repeated descriptions are omitted here.

[0081] The lubricating oil additive may contain...

no. 3 approach

[0093] [Third Embodiment: Lubricating Oil Composition]

[0094] The lubricating oil composition of the third embodiment contains a lubricating oil base oil and a poly(meth)acrylate viscosity index improver. The poly(meth)acrylate viscosity index improver has the following formula (1) The structural units shown and the polymer chains of the structural units represented by the above general formula (2) are formed and the polymer chains are bonded to the core. The weight average of the poly(meth)acrylate viscosity index improver is The molecular weight Mw is 100,000 or more, and the ratio Mw / Mn of the weight average molecular weight Mw to the number average molecular weight Mn is 1.6 or less. Here, the lubricating oil composition of the present embodiment includes an embodiment including the lubricating oil base oil and the lubricating oil additive of the above-mentioned second embodiment. The poly(meth)acrylate-based viscosity index improver in this embodiment is the same as th...

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Abstract

The present invention provides a poly(meth)acrylate-based viscosity index improver having a core, and three or more arms comprising a polymer chain containing a structural unit represented by formula (1) and a structural unit represented by formula (2), one end of said polymer chain being bonded to the core. The weight-average molecular weight (Mw) of the poly(meth)acrylate-based viscosity index improver is at least 100,000, and the weight-average molecular weight / the number average molecular weight (Mn) is not more than 1.6. [R1 represents hydrogen or a methyl group; R2 represents the group represented by formula (3); and R3 represents an alkyl group with 1 to 18 carbons. m and n are integers that satisfy m >= 5, n >= 4, and m + n <= 31.]

Description

technical field [0001] The present invention relates to a poly(meth)acrylate viscosity index improver, a lubricating oil additive and a lubricating oil composition containing the viscosity index improver. Background technique [0002] Conventionally, in the field of lubricating oil, studies have been made on improvement of lubricating oil from the viewpoint of energy saving. Especially in recent years, the tendency to protect the global environment has been increasing, and the demand for improving the energy-saving performance of lubricating oils has further increased. [0003] For example, in the case of lubricating oil used in internal combustion engines such as automobile engines (also referred to as "lubricating oil for internal combustion engines" or "engine oil"), as one of means for improving fuel economy, it is known that by adding A method in which a viscosity index improver is added to an oil base oil to increase the viscosity index of a lubricating oil. [0004]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M145/14C10M101/02C10M135/18C10M169/04C10N10/12C10N20/02C10N20/04C10N30/02C10N30/06C10N40/25
CPCC10N2210/02C10N2220/021C10M2219/024C10M2203/1025C10M2215/28C10M2223/04C10N2240/10C10M2209/084C10N2240/04C10N2230/02C10M2215/064C10M145/14C10M2219/046C10N2230/68C10M2215/08C10M2219/106C10N2230/54C10N2010/04C10N2020/04C10N2030/02C10N2030/06C10N2030/08C10N2040/04C10N2040/25C08F220/1818C10N2030/54C10N2030/68C10M101/02C10M135/18C10M169/04
Inventor 松井茂树宫本大也松田裕充田川一生高木彰上野龙一
Owner JX NIPPON OIL & ENERGY CORP
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