A composition of a lubricant including a GTL hydrocarbon, fatty acid amine, and styrene block polymer.

A composition of a lubricant including a GTL hydrocarbon, fatty acid amine, and styrene block polymer.

A lubricating composition including a polymer blend of a modified styrene-maleic anhydride copolymer and poly(meth)acrylate copolymer effective to maintain a pumpable fluid at low temperatures.

A lubricating composition including a polymer blend of a modified styrene-maleic anhydride copolymer and poly(meth)acrylate copolymer effective to maintain a pumpable fluid at low temperatures.

The present invention relates to the field of multipurpose lubricants which may be used in the various components of automotive vehicles, notably in the engine, the transmission or the hydraulic circuit.

The invention relates to the use of at least one polymer which improves the viscosity index, chosen from hydrogenated copolymers of diene and of aromatic vinyl, in a lubricant composition for decreasing the viscosity of said lubricant composition in the course of the use of said lubricant composition during the lubrication of the various components of an industrial vehicle, notably of a diesel engine industrial vehicle, such as the engine, the gearbox and the hydraulic circuit, said lubricant composition undergoing at least one thermal shear during its use.

The present invention relates to the field of multipurpose lubricants which may be used in the various components of automotive vehicles, notably in the engine, the transmission or the hydraulic circuit.

The invention relates to the use of at least one polymer which improves the viscosity index, chosen from hydrogenated copolymers of diene and of aromatic vinyl, in a lubricant composition for decreasing the viscosity of said lubricant composition in the course of the use of said lubricant composition during the lubrication of the various components of an industrial vehicle, notably of a diesel engine industrial vehicle, such as the engine, the gearbox and the hydraulic circuit, said lubricant composition undergoing at least one thermal shear during its use.

A friction inhibiting compound of the present invention is a friction inhibiting compound including a copolymer (A) that includes a polymerizable monomer (a) and a polymerizable monomer (b) as constituent monomers, wherein the polymerizable monomer (a) includes a specific alkyl acrylate or alkyl methacrylate, the polymerizable monomer (b) is at least one selected from the group consisting of specific hydroxyalkyl acrylates and hydroxyalkyl methacrylates; specific alkyl acrylates and alkyl methacrylates; and aromatic vinyl monomers having 8 to 14 carbon atoms, and a composition ratio of the polymerizable monomer (a) and polymerizable monomer (b) in the copolymer (A), represented by (a):(b), is (10 to 45):(55 to 90) in a molar ratio (provided that a total molar ratio of (a) and (b) is 100), and the weight average molecular weight of the copolymer (A) is 1,000 to 500,000.

A friction inhibiting compound of the present invention is a friction inhibiting compound including a copolymer (A) that includes a polymerizable monomer (a) and a polymerizable monomer (b) as constituent monomers, wherein the polymerizable monomer (a) includes a specific alkyl acrylate or alkyl methacrylate, the polymerizable monomer (b) is at least one selected from the group consisting of specific hydroxyalkyl acrylates and hydroxyalkyl methacrylates; specific alkyl acrylates and alkyl methacrylates; and aromatic vinyl monomers having 8 to 14 carbon atoms, and a composition ratio of the polymerizable monomer (a) and polymerizable monomer (b) in the copolymer (A), represented by (a):(b), is (10 to 45):(55 to 90) in a molar ratio (provided that a total molar ratio of (a) and (b) is 100), and the weight average molecular weight of the copolymer (A) is 1,000 to 500,000.

The invention provides a lubricating oil composition for diesel engines which contains a GTL base oil with a kinematic viscosity at 100 C. of 4.5 to 5.5 mm2/s, a comblike PMA (polymethacrylate) based viscosity index improver and a boron-containing dispersant and/or boron-containing detergent, the total content of the boron-containing dispersant and/or boron-containing detergent in terms of conversion to boron content relative to the total amount of the composition being not less than 0.025 mass %, and which satisfies 0W-30 or 5W-30 in the SAE J300 standard.

The invention provides a lubricating oil composition for diesel engines which contains a GTL base oil with a kinematic viscosity at 100 C. of 4.5 to 5.5 mm2/s, a comblike PMA (polymethacrylate) based viscosity index improver and a boron-containing dispersant and/or boron-containing detergent, the total content of the boron-containing dispersant and/or boron-containing detergent in terms of conversion to boron content relative to the total amount of the composition being not less than 0.025 mass %, and which satisfies 0W-30 or 5W-30 in the SAE J300 standard.