The invention provides a grease composition, being a grease composition containing a base oil and, as a thickener a calcium complex soap, and being a grease composition using for the carboxylic acids forming the aforementioned calcium complex soap substituted or unsubstituted C18-22 straight-chain higher fatty acids, aromatic monocarboxylic aromatic acids having substituted or unsubstituted benzene rings and C2-4 straight-chain saturated lower fatty acids, wherein the aforementioned substituted or unsubstituted C18-22 straight-chain higher fatty acids include behenic acid and the amount of behenic acid used, as a mass ratio in terms of the total amount of the aforementioned substituted or unsubstituted C18-22 straight-chain higher fatty acids used, is from 25 mass % up to 70 mass %.

Provided is a grease composition including a base oil (A) containing an alkyl naphthalene (A1) and an aliphatic diurea (B) represented by general formula (b1):
R.sup.1—NHCONH—R.sup.3—NHCONH—R.sup.2  (b1) (wherein, R.sup.1 and R.sup.2 each independently represent a monovalent aliphatic hydrocarbon group having 9 to 20 carbon atoms, and R.sup.3 represents a divalent aromatic hydrocarbon group having 6 to 18 carbon atoms), wherein a content of the aliphatic diurea (B) is 20 to 30% by mass based on a total amount of the grease composition.

The invention relates to liquid dispersion containing surface treated inorganic particle selected from the group consisting of Al.sub.2O.sub.3, AlN, Si.sub.3N.sub.4, SiC, WS.sub.2 and mixtures thereof and at least one liquid fluorinated compound, manufacturing process thereof, and use of such dispersion for increasing thermal conductivity of oil lubricants or heat transfer fluids.

To provide a grease composition for a tapered roller bearing having superior bearing lifetime under a condition of high temperature and a condition of high load, and a tapered roller bearing in which the grease composition for the tapered roller bearing is filled. A tapered roller bearing 11 includes an inner ring 12 having a raceway surface 12a, an outer ring 13 having a raceway surface 13a and a plurality of tapered rollers 14, and a flange part of the inner ring 12 gets into sliding contact with the tapered rollers 14. Grease 16 is filled around the tapered rollers 14. The grease 16 includes a base oil, a thickener and an additive. A frequency in which a storage modulus, which varies depending on frequency, of the grease 16 becomes minimum is equal to 7 Hz or more.

The invention relates to acrylate-olefin copolymers and to a method for preparing these polymers. The present invention is also directed to lubricant compositions comprising these copolymers, and to the use of these copolymers as a lubricant additive or a synthetic base fluid in a lubricating oil composition, preferably in a gear oil composition, a transmission oil composition, a hydraulic oil composition, an engine oil composition, a marine oil composition, an industrial lubricating oil composition or in grease.

The invention relates to lubricating greases based on alkali metal soaps and/or earth-alkali metal soaps and metal complex soaps based on (R)-10-hydroxyoctadecanoic acid and to the use thereof.

A grease composition including 10 to 98% by mass of a lubricant base oil (A) having a kinematic viscosity at 100° C. of 1 to 14 mm.sup.2/s, a viscosity index of 100 or more, and a pour point of 0° C. or lower, 89 to 1% by mass of a liquid random copolymer (B) of ethylene and α-olefin produced by using a specific catalyst, and 1 to 30% by mass of a thickener (C) (note that the sum total of (A) to (C) is 100% by mass), wherein the lubricant base oil (A) and the copolymer (B) are mixed in such a ratio that the mixture of the lubricant base oil (A) and the ethylene-α-olefin copolymer (B) has a kinematic viscosity at 100° C. of 1 to 500 mm.sup.2/s and a viscosity index of 120 or more.

A continuous process for producing a polyurea concentrate or powder. The process includes combing at least one amine and an isocyanate in the presence of a liquid diluent or a base oil in a rotor stator mixer. The concentrate comprises a polyurea in a base oil wherein the concentration of from about 20 weight percent to about 50, or 40 or 35 or 30 weight percent of polyurea based on total weight of grease thickener. The powder has particle size of 2 to 400 microns. This concentrate or powder can then be formulated by grease manufacturers to the desired final properties without the need for handling of the isocyanate and amine raw materials.

A non-curable injectable ester containing packing material for use in the repair of leaking valves contains a calcium sulfonate grease containing at least one polyalphaolefin, an ester, an anti-wear/anti-galling agent, a binding/thickening agent and a plasticizing agent.

A silicone composition having an electromagnetic wave absorbing property and thermal conductivity includes liquid silicone; a high-specific-gravity soft magnetic filler having a specific gravity of 4.5 or greater; an intermediate-specific-gravity thermally conductive filler having a specific gravity of 4.0 or less; and a non-liquid anti-thickening and anti-settling agent. Furthermore, a curable grease is a two-component curable grease including a combination of a base compound and a curing agent that are used by being mixed together when used, the curable grease being to be cured by mixing of the base compound with the curing agent. The base compound is a silicone composition of the present invention, in which the liquid silicone is an organopolysiloxane having a vinyl group at an end thereof. The curing agent is a silicone composition of the present invention, in which the liquid silicone is an organohydrogenpolysiloxane.