Abstract: A lubricating oil composition may be used for lubrication of a shock absorber, and may include a base oil (A), a polyalkyl (meth)acrylate (B) having a weight average molecular weight in a range of from 150,000 to 900,000, and an olefin copolymer (C) having a weight average molecular weight of 100,000 or less.

Abstract: A lubricating oil composition may include a base oil (A), a zinc dithiophosphate (B) comprising a compound (B1) of formula (b-1), calcium sulfonate (C), and a seal sweller (D). In formula (b-1), R1 to R4 are each independently an alkyl group. However, at least one of R1 to R4 is a prescribed straight-chain alkyl group, and at least one of R1 to R4 is a prescribed branched chain alkyl group.

Abstract: Provided is a lubricating oil composition for a shock absorber, the lubricating oil composition being capable of emitting fluorescence by ultraviolet irradiation while ensuring thermal stability and abrasion resistance. This lubricating oil composition for a shock absorber contains, as components: (A) a base oil; (B) a hydrocarbon compound having a stilbene structure; and (C) a phosphite ester.

Abstract: The present invention relates to a lubricating oil composition for drive system apparatus having excellent wear resistance and oxidation stability and a method for producing the same, a lubrication method of a drive system apparatus using the foregoing lubricating oil composition, and a drive system apparatus.

Abstract: This vibration damping device (10) includes a magnetorheological fluid composition in a cylinder (12). The magnetorheological fluid composition includes magnetic particles; a dispersant having the magnetic particles dispersed therein; and a friction modifier. The friction modifier is an ester-based additive having a hydrocarbon chain having 14 to 22 carbon atoms, preferably an alkyl chain or an alkenyl chain. The content of the friction modifier is 0.1 to 5 mass %.

Abstract: This vibration damping device (10) includes a magnetorheological fluid composition in a cylinder (12). The magnetorheological fluid composition includes magnetic particles; a dispersant having the magnetic particles dispersed therein; and a friction modifier. The friction modifier is an amine-based additive having a hydrocarbon chain having 14 to 22 carbon atoms, preferably an alkyl chain or an alkenyl chain. The content of the friction modifier is 0.1 to 5 mass %.

Abstract: Provided is a lubricating oil composition for a shock absorber, the lubricating oil composition being capable of emitting fluorescence by ultraviolet irradiation while ensuring thermal stability and abrasion resistance. This lubricating oil composition for a shock absorber contains, as components: (A) a base oil; (B) a hydrocarbon compound having a stilbene structure; and (C) a phosphite ester.

Abstract: To provide a lubricating oil composition having excellent viscosity characteristics and a property of difficulty in evaporation, which contains a base oil having a kinematic viscosity at 40° C. of 4.0 mm2/s or more and less than 6.0 mm2/s, a kinematic viscosity at 100° C. of 1.0 mm2/s or more and less than 2.0 mm2/s and a flash point of 140° C. or more, and a viscosity index improver, and has a Brookfield viscosity at ?40° C. of 750 mPa·s or less, a kinematic viscosity at 60° C. of 5.5 mm2/s or more, and a NOACK value at 145° C. for 1 hour of 10% by mass or less.

Abstract: Provided are a lubricating oil composition for shock absorber, containing a base oil and a comb polymer having a mass average molecular weight of 5×104 or more and 1×106 or less, which has a high viscosity index and provides a shock absorber capable of keeping a damping force thereof substantially constant at any temperature and exhibiting excellent damping force characteristics; a method of producing the lubricating oil composition for shock absorber; a damping method; and a shock absorber.

Abstract: This vibration damping device (10) includes a magnetorheological fluid composition in a cylinder (12). The magnetorheological fluid composition includes magnetic particles; a dispersant having the magnetic particles dispersed therein; and a friction modifier. The friction modifier is an ester-based additive having a hydrocarbon chain having 14 to 22 carbon atoms, preferably an alkyl chain or an alkenyl chain. The content of the friction modifier is 0.1 to 5 mass %.

Abstract: This vibration damping device (10) includes a magnetorheological fluid composition in a cylinder (12). The magnetorheological fluid composition includes magnetic particles; a dispersant having the magnetic particles dispersed therein; and a friction modifier. The friction modifier is an amine-based additive having a hydrocarbon chain having 14 to 22 carbon atoms, preferably an alkyl chain or an alkenyl chain. The content of the friction modifier is 0.1 to 5 mass %.

Abstract: A lubricating oil composition of the invention contains: a base oil; at least one of acid phosphate represented by formulae (1) and (2) below; and an antioxidant. In the above formulae: R1, R2 and R3 are alkyl groups; and at least one of R1 and R2 has 20 to 30 carbon atoms while R3 has 20 to 30 carbon atoms.

Abstract: The lubricating oil composition for a shock absorber of the present invention contains (A) a base oil composed of a mineral oil and/or a synthetic oil, (B) a tertiary amine represented by the following general formula (I), and (C) a zinc dithiophosphate represented by the following general formula (II): wherein R1 and R2 each independently represent an aliphatic hydrocarbon group having from 1 to 5 carbon atoms, and R3 represents an aliphatic hydrocarbon group having from 12 to 24 carbon atoms in the general formula (I), wherein R4 to R7 each independently represent one selected from an alkyl group and an alkenyl group each having 1 to 24 carbon atoms in the general formula (II).

Abstract: Provided is a lubricating oil composition for a shock absorber excellent in thermal stability and capable of reducing the friction factor for rubber. The lubricating oil composition for a shock absorber contains (A) a base oil composed of a mineral oil and/or a synthetic oil, (B) a zinc dithiophosphate represented by the following general formula (I), (C) a fatty acid amide and (D) a polyalcohol ester. In the formula, R1 to R4 each independently represent at least one selected from a linear, branched or cyclic alkyl group having from 6 to 20 carbon atoms and a linear, branched or cyclic alkenyl group having from 6 to 20 carbon atoms.

Abstract: Provided is a lubricating oil composition for a shock absorber, which realizes excellent riding comfort in low-temperature and high-temperature environments and can suppress worsening of riding comfort with time, which is caused by evaporation and shearing of the lubricating oil. The lubricating oil composition for a shock absorber contains (A) a base oil having a pour point of lower than ?40° C. and a kinematic viscosity at 80° C. of from 2.0 to 2.7 mm2/s, (B-1) from 1 to 15% by mass of a polymethacrylate having a weight-average molecular weight of from 10,000 to less than 100,000, and (B-2) from 0.1 to 5% by mass of a polymethacrylate having a weight-average molecular weight of from 100,000 to 200,000.

Abstract: The lubricating oil composition for a shock absorber of the present invention contains (A) a base oil containing a mineral oil and/or a synthetic oil, (B) a tertiary amine represented by the following general formula (I), (C) a zinc dithiophosphate represented by the following general formula (II), and (D) a phosphorus acid ester amine salt, wherein R1 and R2 each independently represent an aliphatic hydrocarbon group having from 1 to 5 carbon atoms, and R3 represents an aliphatic hydrocarbon group having from 12 to 24 carbon atoms, in the general formula (I), wherein R4 to R7 each independently represent one selected from an alkyl group and an alkenyl group each having from 1 to 24 carbon atoms, in the general formula (II).

Abstract: A lubricating oil composition includes: a base oil; a component (A) that is a dialkyl hydrogen phosphite; a component (B) that is a sulfur antioxidant; and a component (C) that is a polyalkenyl succinimide. Since the lubricating oil composition of the invention exhibits an excellent lubricity to both iron metal and copper metal and an excellent heat stability, the lubricating oil composition of the invention is suitable for a shock absorber of an automobiles and the like.

Abstract: Provided is a lubricating oil composition for a shock absorber excellent in thermal stability and capable of reducing the friction factor for rubber. The lubricating oil composition for a shock absorber contains (A) a base oil composed of a mineral oil and/or a synthetic oil, (B) a zinc dithiophosphate represented by the following general formula (I), (C) a fatty acid amide and (D) a polyalcohol ester. In the formula, R1 to R4 each independently represent at least one selected from a linear, branched or cyclic alkyl group having from 6 to 20 carbon atoms and a linear, branched or cyclic alkenyl group having from 6 to 20 carbon atoms.

Abstract: Provided is a lubricating oil composition for a shock absorber, which realizes excellent riding comfort in low-temperature and high-temperature environments and can suppress worsening of riding comfort with time, which is caused by evaporation and shearing of the lubricating oil. The lubricating oil composition for a shock absorber contains (A) a base oil having a pour point of lower than ?40° C. and a kinematic viscosity at 80° C. of from 2.0 to 2.7 mm2/s, (B-1) from 1 to 15% by mass of a polymethacrylate having a weight-average molecular weight of from 10,000 to less than 100,000, and (B-2) from 0.1 to 5% by mass of a polymethacrylate having a weight-average molecular weight of from 100,000 to 200,000.

Abstract: The lubricating oil composition for a shock absorber of the present invention contains (A) a base oil composed of a mineral oil and/or a synthetic oil, (B) a tertiary amine represented by the following general formula (I), and (C) a zinc dithiophosphate represented by the following general formula (II): wherein R1 and R2 each independently represent an aliphatic hydrocarbon group having from 1 to 5 carbon atoms, and R3 represents an aliphatic hydrocarbon group having from 12 to 24 carbon atoms in the general formula (I), wherein R4 to R7 each independently represent one selected from an alkyl group and an alkenyl group each having 1 to 24 carbon atoms in the general formula (II).