Infineum International Limited

Rajiv Taribagil

Stuart Briggs

Laurent Chambard

Stuart A Taylor

Richard D Bertram

Robin Howard Scott

Isabella Goldmints

Bogdan Barboiu

Robin Scott

Richard David Bertram

Concentrates of linear, block copolymers having a polymer block derived from a monoalkenyl arene, covalently linked to one or more blocks of a hydrogenated derivative of a conjugated diene copolymer, dissolved in highly saturated diluent oil, wherein the size of the monoalkenyl arene block is controlled to provide an optimized level of incompatibility of the block copolymer in the selected diluent.

Viscosity index improver concentrates for lubricating oil compositions

A viscosity index improver containing, in non-ester diluent oil, one or more hydrogenated, functionalized linear block copolymers having at least one block derived from monoalkenyl arene covalently linked to at least one block derived from diene in an amount that is greater than the critical overlap concentration (c*), in mass %, for the linear block copolymers in the diluent oil; and an amount of ester base stock.

Viscosity index improver concentrates

A viscosity index improver containing, in diluent oil, one or more optionally functionalized linear block copolymers having at least one block derived from alkenyl arene covalently linked to at least one block derived from diene in an amount that is greater than the critical overlap concentration (c*), in mass %, for the linear block copolymers in the diluent oil; and ester base stock and/or at least one star (or radial) polymer, the star polymer being present in an amount such that the c/c* value of the star polymer in the concentrate falls within the range of from 0.01 to about 1.6, wherein c is the concentration in mass % of star polymer in the concentrate and c* is the critical overlap concentration in mass % for the star polymer in the diluent oil used to form the concentrate.

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Edison, NJ, United States of America

Rajiv Taribagil