A lithium salt thickener that enhances thermal stability at high temperature and operability at low temperature, and a grease composition including the same, is provided.

A lithium salt thickener that enhances thermal stability at high temperature and operability at low temperature, and a grease composition including the same, is provided.

Concentrates containing specific functionalised diblock copolymers serve as effective additives for improving the cold flow behaviour of fuels and oils, the copolymers being derived from a terminally-unsaturated intermediate polymer obtained via a metallocene process involving hydrogen.

Concentrates containing specific functionalised diblock copolymers serve as effective additives for improving the cold flow behaviour of fuels and oils, the copolymers being derived from a terminally-unsaturated intermediate polymer obtained via a metallocene process involving hydrogen.

A viscosity index improver including a comb-shaped polymer is provided. For a solution having the viscosity index improver dissolved in a mineral oil and having a solid component concentration of 25 mass %, a ratio of the storage modulus (G) to the loss modulus (G) of the solution measured at a measuring temperature of 70 C. is 0.40 or more. For a solution () at 25 C. having the viscosity index improver dissolved in a mineral oil and having a solid component concentration of 25 mass % and a solution () resulting from subjecting the solution () to heating to 100 C. at a prescribed temperature rise rate and then cooling to 25 C. at a prescribed cooling rate, a ratio of the storage modulus (G) of the solution () to the storage modulus (G) of the solution () measured at a measuring temperature of 25 C. is 2.0 or more.

A viscosity index improver including a comb-shaped polymer is provided. For a solution having the viscosity index improver dissolved in a mineral oil and having a solid component concentration of 25 mass %, a ratio of the storage modulus (G) to the loss modulus (G) of the solution measured at a measuring temperature of 70 C. is 0.40 or more. For a solution () at 25 C. having the viscosity index improver dissolved in a mineral oil and having a solid component concentration of 25 mass % and a solution () resulting from subjecting the solution () to heating to 100 C. at a prescribed temperature rise rate and then cooling to 25 C. at a prescribed cooling rate, a ratio of the storage modulus (G) of the solution () to the storage modulus (G) of the solution () measured at a measuring temperature of 25 C. is 2.0 or more.

Concentrates containing specific functionalised diblock copolymers serve as effective additives for improving the cold flow behaviour of fuels and oils, the copolymers being derived from a terminally-unsaturated intermediate polymer obtained via a metallocene process involving hydrogen.

A lithium salt thickener that enhances thermal stability at high temperature and operability at low temperature, and a grease composition including the same, is provided.

A lithium salt thickener that enhances thermal stability at high temperature and operability at low temperature, and a grease composition including the same, is provided.

This invention relates to a lubricating oil composition, or concentrate therefor, comprising or resulting from the admixing of: (i) base oil, (ii) one or more styrenic block copolymers having a radial structure where one or more blocks derived from conjugated diene monomers are distal to the radial center and one more blocks derived from vinyl aromatic monomers that are proximal to the radial center, and (iii) optionally one or more dispersants and or detergents.