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Viscosity index improving agent and lubricating oil composition

A technology of lubricating oil composition and viscosity index, applied in the field of lubricating oil composition and viscosity index improver, can solve problems such as liquid leakage and sintering

Inactive Publication Date: 2009-05-06
SANYO CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if only the viscosity is reduced, there will be problems of leakage or sintering

Method used

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  • Viscosity index improving agent and lubricating oil composition
  • Viscosity index improving agent and lubricating oil composition
  • Viscosity index improving agent and lubricating oil composition

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0052] The viscosity index improver of the 1st Embodiment of this invention consists of a copolymer (A) [it may only be called (A) hereafter]. (A) The monomer (a) represented by General formula (1) [it may only be referred to as (a) hereafter] is a constituent monomer.

[0053]

[0054] In general formula (1), R 1 is a hydrogen atom or a methyl group, preferably a methyl group. R 2 is a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, preferably a hydrogen atom or a methyl group. R 3 is a hydrogen atom or an alkyl group with 8 to 40 carbon atoms, preferably a hydrogen atom, -CH 2 CH(R 5 )-[CH(R 6 )] k -CH 3 and straight-chain alkyl groups with 10 to 18 carbon atoms. n R 4 Each independently represents a hydrogen atom or an alkyl group with 1 to 3 carbon atoms, and R 2 and n R 4 At least one group in is an alkyl group having 1 to 3 carbon atoms. above-CH 2 CH(R 5 )-[CH(R 6 )] k -CH 3 Base, R 5 It is a hydrogen atom or an alkyl group with 1 to 3 ...

no. 2 Embodiment approach

[0288] The second embodiment of the present invention relates to a viscosity index improver composition. Here, the "viscosity index improver composition" refers to a solution obtained by dissolving the aforementioned viscosity index improver in a diluent solvent (D).

[0289] Compared with the use of the viscosity index improver itself, the use of the viscosity index improver composition is preferable because even if the copolymer (A) alone is viscous, by making the viscosity index improver composition contain the diluting solvent (D) , and the copolymer (A) can also be easily dissolved when added to the base oil.

[0290] The viscosity index improver composition of the present invention contains the above-mentioned viscosity index improver and diluent solvent (D), based on the total weight of the viscosity index improver and dilute solvent (D), the viscosity index improver composition of the present invention preferably contains 10% ~90% (hereinafter unless otherwise specifi...

no. 3 Embodiment approach

[0297] A lubricating oil composition according to a third embodiment of the present invention is a composition containing the aforementioned viscosity index improver and a base oil. The base oil is characterized in that the kinematic viscosity of the base oil at 100°C is 2mm 2 / s~10mm 2 / s and the base oil has a flash point of 160° C. or higher, and the base oil contains 0.1% by weight to 30% by weight of the copolymer (A) based on the weight of the lubricating oil composition. Also, the viscosity index improver may be added to the base oil in the form of the viscosity index improver composition described above. In this case, the diluting solvent (D) is also contained in the lubricating oil composition.

[0298] Examples of the base oil include the above-mentioned mineral oils, synthetic lubricating oils, and the like. Among them, high viscosity index oils containing isoparaffin, high viscosity index oils obtained by hydrocracking, poly-α-olefin-based synthetic lubricating ...

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Abstract

Disclosed is a viscosity index improver which is excellent in shear stability, viscosity index improvability and low-temperature viscosity characteristics. Also disclosed are a lubricant composition containing such a viscosity index improver, and a monomer which is used for producing such a viscosity index improver. Specifically disclosed is a viscosity index improver composed of a copolymer (A) which contains a monomer (a) represented by the general formula (1) below as a constituent monomer. Also specifically disclosed is a lubricant composition containing the viscosity index improver and a base oil, and a monomer composition containing the monomer (a).

Description

technical field [0001] The present invention relates to a viscosity index improver and a lubricating oil composition containing the viscosity index improver. More specifically, the present invention relates to a viscosity index improver, a lubricating oil composition containing the viscosity index improver, and a specific monomer composition constituting a copolymer contained in the viscosity index improver, the viscosity index improver not only It is excellent in shear stability and viscosity index improving ability, and also excellent in low-temperature viscosity characteristics. Background technique [0002] In recent years, the call for protecting the global environment has become increasingly louder, and people have put forward higher requirements for the fuel economy of vehicles. As one of the methods of saving fuel consumption, reduction of viscous drag by lowering the viscosity of lubricating oil can be mentioned. However, if the viscosity is only lowered, there wi...

Claims

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Application Information

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IPC IPC(8): C09K3/00C08F220/26C08F290/06C08F299/00C10M101/02C10M137/04C10M137/08C10M145/14C10N20/00C10N20/02C10M169/04C10N20/04C10N30/02C10N30/08C10N40/04C10N40/06C10N40/08C10N40/25
CPCC10N2220/021C08F290/06C10M2223/04C10N2240/10C10N2240/06C08F220/34C10M145/14C10M2209/084C08F290/062C10N2240/04C10N2240/08C10M2223/043C08F220/18C08F220/26C10M2209/103C10N2230/08C08F220/14C08F290/061C08F299/00C10N2220/022C10N2020/02C10N2020/04C10N2030/08C10N2040/04C10N2040/06C10N2040/08C10N2040/25C08F220/1812C08F220/1818C10M2209/108
Inventor 由岐刚滨野一树
Owner SANYO CHEM IND LTD