Grease composition, viscous agent, and mechanical element

a viscous agent and grease composition technology, applied in the direction of thickeners, liquid degasification, separation processes, etc., can solve the problems of insufficient selection of grease compositions for lubricating resin surfaces, inability to contribute to viscous agent lubricating performance, and easy access, etc., to achieve low friction performance and low wear performance

Inactive Publication Date: 2008-08-14
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0014]An object of a first invention is to provide a grease composition having low friction performance and low wearing performance.

Problems solved by technology

The grease composition has, therefore, been exhibiting important functions in lubrication and protection of contact portions of sliding components such as roller bearing, slide bearing, sintered bearing, gear, valve, cock, oil seal, electric contacts and so forth, all of which being not readily accesible for replacement of lubricating oils.
However, the viscous agent in the grease composition cannot contribute to lubricating performance, that is to reduce friction, and suffers from an intrinsic problem of gradually degrading its viscosity-enhancing function under severe shearing, which is intrinsically ascribable to its chemical structure.
Another problem is such that the grease composition is not always optimally selected for lubrication of resin surfaces, despite its relatively larger opportunities of use for resin surfaces, but is used only after being appropriately adjusted in the content of extreme pressure agents (most of which are substances of environmental impact) used for lubrication of steel base.

Method used

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  • Grease composition, viscous agent, and mechanical element
  • Grease composition, viscous agent, and mechanical element
  • Grease composition, viscous agent, and mechanical element

Examples

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examples

[0347]The invention will be further specifically described below with reference to the following Examples. Materials, reagents, amounts and proportions thereof, operations, and the like as shown in the following Examples can be properly changed so far as the gist of the invention is not deviated. Accordingly, it should not be construed that the scope of the invention is limited to the following specific examples.

(1) Examples of First Invention

(1)-1 Examples Using Polymer Having Mesogen Structure in Side Chains

[0348]Greases (Example 1-1 to 1-11) having a formulation shown in Tables 1-1 to 1-3 below were respectively prepared. Beside these, greases (Comparative Examples 1-1 to 1-4) having a formulation shown in Table 1-4 below were respectively prepared, using various base oils for lubricant. The polymers used in Example 1 to 11 were produced according to the synthetic methods described in the above-described literatures. For example, DSP-37 was synthesized according to a method descr...

example 3-1

Evaluation of Performance of Grease Compositions

[0378]Using Exemplary Compounds LUB-7, LUB-11, LUB-14, LUB-29, LUB-127, LUB-38, LUB-154, LUB-156, and base oils for lubricant, greases (Examples 3-1 to 3-12) having a formulation shown in Tables 3-1 to 3-3 below were respectively prepared. Beside these, greases (Comparative Examples 3-1 to 3-4) having a formulation shown in Table 3-4 below were respectively prepared, using various base oils for lubricant.

[0379]The samples were subjected to friction test to thereby measure friction coefficient and depth of wear mark. The friction coefficient of each sample was measured using a reciprocating friction tester (SRV friction-wear tester), wherein the friction test was carried out under the test conditions below. Results of Examples 3-1 to 3-5 were shown in Table 3-1, results of Examples 3-6 to 3-10 were shown in Table 3-2, results of Examples 3-11 and 3-12 were shown in Table 3-3, and results of Comparative Examples 3-1 to 3-4 were shown in...

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Abstract

A grease composition comprising at least one polymer having a mesogen structure in the principal chain or in the side chain(s) thereof, and at least one viscous agent is disclosed. A viscous agent which is a discotic compound having, in the molecule thereof, a discotic core and three or more side chain groups radially extended from said discotic core is also disclosed. The discotic core and/or said side chain groups has at least one tautomeric group therein, and at least one side chain group of said three or more side chains has, at the end portion thereof, a long chain group in which 20 or more atoms selected from the group consisting of oxygen, carbon, nitrogen, silicon and sulfur atoms are linked in a straight-chain-like manner or in a branched manner.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims benefit of priority under 35 U.S.C. 119 to Japanese Patent Application Nos. 2007-031359 filed Feb. 9, 2007, 2007-031360 filed Feb. 9, 2007, 2007-031361 filed Feb. 9, 2007, 2007-031362 filed Feb. 9, 2007, 2007-262836 filed Oct. 9, 2007 and 2007-262837 Oct. 9, 2007, and the entire contents of the applications are incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a grease composition, a viscous agent and a mechanical element.[0004]2. Related Art[0005]Lubricating grease used as a lubricant for mechanical components generally contains viscous agent, base oil, and additives. Most part of characteristics of grease is often determined by types of the viscous agent, or types of the base oil, wherein additives are used in order to impart characteristics not sufficiently covered by them.[0006]With recent progress made in the industrial field with ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C10M105/76C10M105/70C10M107/02C10M105/18
CPCC09K19/3804C09K19/3823C09K19/3828C09K19/3833C09K19/3861C09K2019/0429C10M115/04C10M115/06C10M115/08C10M115/10C10M119/24C10M119/26C10M119/30C10M169/00C10M169/02C10M169/06C10M2203/065C10M2203/1006C10M2205/0206C10M2205/0285C10M2207/006C10M2207/0413C10M2207/044C10M2207/10C10M2207/1256C10M2207/1265C10M2207/1285C10M2207/284C10M2207/2865C10M2209/08C10M2209/0813C10M2209/084C10M2209/1026C10M2211/0425C10M2213/043C10M2213/046C10M2213/0606C10M2215/08C10M2215/0813C10M2215/102C10M2215/1026C10M2215/22C10M2215/2206C10M2215/221C10M2215/222C10M2215/223C10M2217/02C10M2217/0213C10M2217/0456C10M2219/006C10M2219/044C10M2219/09C10M2219/102C10M2219/104C10M2221/006C10M2221/02C10M2229/006C10M2229/025C10M2229/0415C10N2210/01C10N2220/06C10N2220/10C10N2230/06C10N2230/56C10N2250/10C10N2250/12C10N2280/00C10N2010/02C10N2030/06C10N2050/10C10N2080/00C10N2020/079C10N2020/081C10N2030/56C10N2050/015
Inventor KAWATA, KENNEGORO, MASAYUKI
Owner FUJIFILM CORP
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