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  Grease composition for harnessesUSPTO Application #: 20060205613Title: Grease composition for harnesses Abstract: The present invention relates to a grease composition for use in harnesses, which comprises a thickening agent, a base oil and additives, wherein the base oil comprises a polyoxyalkylene glycol ether and the additives comprise a quinoline compound and a benzotriazole compound. The grease composition is quite excellent in the corrosion resistance, the oxidation stability and the compatibility with materials such as olefinic elastomer. (end of abstract) Agent: Nixon & Vanderhye, PC - Arlington, VA, US Inventors: Kyosuke Ikuma, Ko Yaegashi, Hiroshi Kimura, Keiji Sasaki, Shozo Ikejima, Masahiko Sugaya, Masahiko Morikawa USPTO Applicaton #: 20060205613 - Class: 508163000 (USPTO) Related Patent Categories: Solid Anti-friction Devices, Materials Therefor, Lubricant Or Separant Compositions For Moving Solid Surfaces, And Miscellaneous Mineral Oil Compositions, Lubricants Or Separants For Moving Solid Surfaces And Miscellaneous Mineral Oil Compositions (e.g., Water Containing, Etc.), Inorganic Compound (except Water) (overbased Or Carbonated Organic Acidic Compounds Are Not Classified In This Subclass Or Its Indents On The Basis Of Inorganic Overbasing Or Carbonating Agents; The Overbased Or Carbonated Compounds Are Treated As Complexes, And Are Classified With The Particular Organic Acidic Compound), The Inorganic Compound Contains Phosphorus Or Silicon (e.g., Phosphorus Sulfide, Etc.), With Inorganic Compound Not Containing Phosphorus (except Water) The Patent Description & Claims data below is from USPTO Patent Application 20060205613. Brief Patent Description - Full Patent Description - Patent Application Claims
BACKGROUND OF THE INVENTION [0001] The present invention relates to a grease composition for use in a harness. [0002] In various automotive engine accessories, in particular, harness members arranged in the proximity to an air conditioner, the condensed water originated from, for instance, the moisture present in the atmosphere may penetrate into, for instance, a connector to thus corrode metallic parts constituting the same (materials for contact parts) and therefore, these metallic parts should certainly be protected from such corrosion. In addition, a lubricant (a grease composition obtained by adding a thickening agent to a base oil and then forming the resulting blend into a semi-solid product) should satisfy, for instance, the following requirements: it should have excellent corrosion resistance and oxidation stability in order that these parts can be used over a long period of time or in order to extend the service life of the parts. Furthermore, olefinic elastomers have recently been substituted for the polyvinyl chloride as a coating material for metallic parts for the purpose of reducing the quantity of materials which may not be environment-friendly and accordingly, it has been desired to design such a grease composition while taking into consideration the compatibility thereof with the coating materials for such parts. [0003] Conventionally, as a grease composition for filling up the distributing wire connector of a wire harness used for automobiles, there has been reported a grease composition having excellent heat resistance (Patent Document 1: JP-B-6-99702). However, this grease composition employs a purified mineral oil as a base oil and therefore, this grease composition is considered to have low compatibility with, for instance, olefinic elastomers and this composition is not designed to take into sufficient consideration the corrosion resistance and the oxidation stability. [0004] In addition, there has also been reported a grease composition for use in a speed-reducing device (gear), which is excellent in the anticorrosive properties and which does not adversely affect materials such as rubber materials too much (Patent Document 2: JP-A-4-266995; Patent Document 3: JP-A-63-309591; and Patent Document 4: JP-A-64-29496). These grease compositions can satisfy the requirement for the compatibility with the coating materials for such parts, for instance, olefinic elastomers, but they are not always sufficient in the corrosion resistance and the oxidation stability. DISCLOSURE OF THE INVENTION [0005] Accordingly, it is an object of the present invention to provide a grease composition for harnesses and more particularly to provide a grease composition for harnesses, which is excellent in the compatibility with the coating materials for parts of harnesses such as olefinic elastomers, the corrosion resistance and the resistance to oxidation. [0006] The inventors of this invention have thus conducted various studies to eliminate the foregoing drawbacks associated with the foregoing conventional techniques concerning grease compositions for, in particular, harnesses, have found that the foregoing drawbacks can efficiently be eliminated by the use of a base oil containing a specific component and specific compounds as additives for the grease composition and have thus completed the present invention. [0007] According to the present invention, there is thus provided a grease composition for use in harnesses, which comprises a thickening agent, a base oil and additives, wherein the base oil comprises a polyoxyalkylene glycol ether and the additives comprise a quinoline compound and a benzotriazole compound. [0008] In a preferred embodiment of the grease composition for use in harnesses according to the present invention, the thickening agent is at least one member selected from the group consisting of lithium soaps and bentonite materials modified with organic compounds (organically modified bentonite materials). [0009] In a further preferred embodiment of the grease composition for use in harnesses according to the present invention, the polyoxyalkylene glycol ether has a kinematic viscosity as determined at a temperature of 40.degree. C. ranging from 30 to 400 mm.sup.2/s. [0010] In a still further preferred embodiment of the grease composition for use in harnesses according to the present invention, the content of the quinoline compound ranges from 0.1 to 10% by mass on the basis of the total mass of the grease composition, and the content of the benzotriazole compound ranges from 0.1 to 10% by mass on the basis of the total mass of the grease composition. [0011] The grease composition of the present invention makes use of a polyoxyalkylene glycol ether-containing base oil and comprises, as additives, a quinoline compound and a benzotriazole compound and therefore, the grease composition is excellent in the compatibility with the coating materials for parts of harnesses such as olefinic elastomers, the corrosion resistance and the resistance to oxidation. BEST MODE FOR CARRYING OUT THE INVENTION [0012] The grease composition of the present invention is characterized in that it uses, as a base oil, one containing a polyoxyalkylene glycol ether, which does not adversely affect the olefinic materials too much. Preferably used in the present invention are polyoxyalkylene glycol ethers represented by the following general formula I: R.sup.1O--(CH.sub.2CHR.sup.2O).sub.n--R.sup.3 Formula I [0013] In Formula I, R.sup.1 and R.sup.3 each independently represents a hydrogen atom or an alkyl group having 1 to 20, preferably 1 to 6 carbon atoms (such as a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, an isobutyl group, a pentyl group or a hexyl group); R.sup.2 represents an alkyl group having 1 to 10, preferably 1 to 4 carbon atoms (such as a methyl group, an ethyl group, a propyl group or a butyl group); and n represents a numeral ranging from 5 to 30 and preferably 8 to 20, provided that R.sup.1 and R.sup.3 do not simultaneously represent hydrogen atoms. [0014] Specific examples of the polyoxyalkylene moieties of the polyoxyalkylene glycol ethers represented by the general formula I include polyoxyethylene, polyoxypropylene, poly(oxypropylene-oxyethylene), poly(oxybutylene-oxyethylene), poly(oxybutylene-oxypropylene), poly(oxypentylene-oxyethylene) and poly(oxypentylene-oxypropylene). [0015] The polyoxyalkylene glycol ethers represented by the general formula I usable herein may be a mono-ether or a di-ether and specific examples thereof include polyoxypropylene monopropyl ether, polyoxypropylene monobutyl ether, polyoxybutylene monobutyl ether, polyoxyethylene oxypropylene monopropyl ether, polyoxyethylene oxypropylene monobutyl ether, polyoxyethylene oxypropylene monopentyl ether, and polyoxypropylene dimethyl ether. Preferred are polyoxypropylene monobutyl ether, and polyoxypropylene dimethyl ether, most preferred is polyoxypropylene dimethyl ether. [0016] Preferably, the base oil used in the present invention comprises a polyoxyalkylene glycol ether in an amount of preferably not less than 50% by mass, more preferably not less than 80% by mass and most preferably 100% by mass on the basis of the total mass of the base oil. The base oil used in the present invention may further comprise other base oil materials currently used in the grease composition such as mineral oils, synthetic hydrocarbon oils, and alkyl diphenyl ether oils in addition to the polyoxyalkylene glycol ether, but the amount thereof is preferably less than 10% by mass on the basis of the total mass of the base oil. [0017] The kinematic viscosity of the polyoxyalkylene glycol ether as determined at 40.degree. C. preferably ranges from 30 to 400 mm.sup.2/s and more preferably 80 to 120 mm.sup.2/s. [0018] As the thickening agent used in the grease composition for harnesses according to the present invention, there may be listed, for instance, those conventionally known in this art such as metal salts of fatty acids, bentonite modified with organic compounds and PTFE, with metal salts of fatty acids and bentonite modified with organic compounds being particularly preferably used herein. [0019] As the constituent fatty acids of the foregoing metal salts of fatty acids, preferably used herein are those having 10 to 30 and more preferably 16 to 20 carbon atoms and examples thereof preferably used herein are lauric acid, myristic acid, palmitic acid, stearic acid, 12-hydroxy stearic acid and oleic acid. Moreover, as the metal salts of these fatty acids, there may be mentioned, for instance, alkali metal salts such as sodium and lithium salts, alkaline earth metal salts such as barium and calcium salts and trivalent metal salts such as aluminum salts. Usable herein further include, for instance, salts of mixtures each comprising at least two fatty acids including dibasic acids with metals such as aluminum, calcium and lithium, or complex metallic soaps. Among these metal salts of fatty acids, most preferably used herein is lithium 12-hydroxy stearate because of its excellent water resistance, heat resistance and mechanical stability. [0020] The amount of the thickening agent to be incorporated into the grease composition of the present invention preferably ranges from 2 to 35 parts by mass and more preferably 5 to 15 parts by mass per 100 parts by mass of the base oil. This is because, if the amount thereof is less than 2 parts by mass, there would be observed such a tendency that the resulting grease composition is in a highly fluidized state and it is thus too soft, while if the amount thereof exceeds 35 parts by mass, the resulting composition is liable to be too hard to use as a grease composition for harnesses. [0021] Examples of quinoline compounds used in the grease composition for harnesses according to the present invention are compounds represented by the following general formula II, such as trimethyl dihydro-quinoline oligomer. Continue reading... Full patent description for Grease composition for harnesses Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Grease composition for harnesses patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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