Abstract: A propylene resin composition containing a propylene homopolymer that satisfies conditions (1) to (3) described below, and having a semicrystallization time (t1/2) of 60 seconds or more: (1) having a melting point (Tm-D) of 120° C. or lower; (2) having a molecular weight distribution (Mw/Mn) less than 3.0; (3) having a melt viscosity at 190° C. of 30,000 mPa·s or less.

Abstract: Provided are a lubricating oil composition which contains a base oil (A) containing an ester-based oil (Al), and a polymer (B) having a constituent unit (b) derived from an alkyl (meth)acrylate, wherein the content of the polymer (B) is 0.1 to 10% by mass based on the total amount of the lubricating oil composition, the lubricating oil composition has a viscosity index of 350 or more, the lubricating oil composition has a BF viscosity at ?40° C. of 4000mPa·s or less, and the lubricating oil composition is used for an impregnated bearing, and an impregnated bearing impregnated with the lubricating oil composition. The lubricating oil composition has excellent lubricity in use in a wide temperature environment from a low temperature region to a high temperature region, is capable of maintaining excellent infiltration property even in an environment in which a temperature change between a low temperature and a high temperature is severe, and is suitable for use in an impregnated bearing.

Abstract: The present invention relates to a thermoplastic resin composition containing a base polymer containing a propylene-based polymer (A) in which a melting endotherm (?H-D) is 0 J/g or more and 60 J/g or less, and a melting point (Tm-D) is not observed or is 0° C. or higher and 120° C. or lower; and a propylene-based polymer (C) in which a melting endotherm (?H-D) is 20 J/g or more and 120 J/g or less, and a melting point (Tm-D) is higher than 120° C., the content of the propylene-based polymer (C) being 0.5 parts by mass or more and 100 parts by mass or less relative to 100 parts by mass of the content of the propylene-based polymer (A).

Abstract: A grease composition for constant velocity joints can have excellent wear resistance, and may include a base oil (A) and a urea-based thickening agent (B) of formula (B1): R1—NHCONH—R3—NHCONH—R2 (B1), wherein R1 and R2 are independently a monovalent C6 to C24 hydrocarbon group, R1 and R2 optionally differing; and R3 is a divalent C6 to C18 aromatic hydrocarbon group, the monovalent hydrocarbon group containing an alicyclic hydrocarbon group and a hydrocarbon chain, and optionally containing an aromatic hydrocarbon group, wherein, in R1 and R2 of formula (B1), if the content of the alicyclic hydrocarbon group is X molar equivalent, the content of the hydrocarbon chain is Y molar equivalent, and the content of the aromatic hydrocarbon group is Z molar equivalent, (a) and (b) are satisfied: (a): a value of {(X+Y)/(X+Y+Z)}×100 is 90 or more; (b): an X/Y ratio is 10/90 to 75/25.

Abstract: Provided are a lubricating oil composition which contains a base oil (A) containing an ester-based oil (Al), and a polymer (B) having a constituent unit (b) derived from an alkyl (meth)acrylate, wherein the content of the polymer (B) is 0.1 to 10% by mass based on the total amount of the lubricating oil composition, the lubricating oil composition has a viscosity index of 350 or more, the lubricating oil composition has a BF viscosity at ?40° C. of 4000mPa·s or less, and the lubricating oil composition is used for an impregnated bearing, and an impregnated bearing impregnated with the lubricating oil composition. The lubricating oil composition has excellent lubricity in use in a wide temperature environment from a low temperature region to a high temperature region, is capable of maintaining excellent infiltration property even in an environment in which a temperature change between a low temperature and a high temperature is severe, and is suitable for use in an impregnated bearing.

Abstract: Provided is a grease composition which is excellent in fire extinguishing performance without water and can suppress fuming, malodor, and liquefaction on burning and a method for producing the grease composition. A grease composition contains a base oil (A), a thickener (B), and a fire retardant (C), wherein the base oil (A) contains a base oil (A1) having a 40° C. kinematic viscosity of 300 mm2/s or more, a sulfur content of 20 ppm by mass or less, and an initial boiling point of 400° C. or higher, the fire retardant (C) is at least one of aluminum hydroxide (C1) and 1,3,5-triazine-1,3,5 (2H, 4H, 6H)-tris(ethanol) (C2), and a content of the fire retardant (C) is 1.0 to 12.0 mass % based on a total amount of the grease composition.

Abstract: The present invention provides a mineral base oil having a kinetic viscosity at 100° C. of 7 mm2/s or more and less than 10 mm2/s, a viscosity index of 100 or more, and a temperature gradient ?|?*| complex viscosity between two temperature points of ?5° C. and ?15° C. of 240 mPa·s/° C. or less as measured with a rotary rheometer at an angular velocity of 6.3 rad/s. The use of the mineral base oil enables easy preparation of a lubricating oil composition and a grease composition having excellent oxidation stability while ensuring the freedom of selection of additives.

Abstract: Provided is a grease composition which is excellent in fire extinguishing performance without water and can suppress fuming, malodor, and liquefaction on burning and a method for producing the grease composition. A grease composition contains a base oil (A), a thickener (B), and a fire retardant (C), wherein the base oil (A) contains a base oil (A1) having a 40° C. kinematic viscosity of 300 mm2/s or more, a sulfur content of 20 ppm by mass or less, and an initial boiling point of 400° C. or higher, the fire retardant (C) is at least one of aluminum hydroxide (C1) and 1,3,5-triazine-1,3,5 (2H, 4H, 6H)-tris(ethanol) (C2), and a content of the fire retardant (C) is 1.0 to 12.0 mass % based on a total amount of the grease composition.

Abstract: The present invention provides a mineral base oil having a kinetic viscosity at 100° C. of 7 mm2/s or more and less than 10 mm2/s, a viscosity index of 100 or more, and a temperature gradient ?|?*| complex viscosity between two temperature points of ?5° C. and ?15° C. of 240 mPa·s/° C. or less as measured with a rotary rheometer at an angular velocity of 6.3 rad/s. The use of the mineral base oil enables easy preparation of a lubricating oil composition and a grease composition having excellent oxidation stability while ensuring the freedom of selection of additives.