Shell Oil Comapny

Rudolf J Eckert

Jan J Bleeker

Jacob B Roest

Jan H Lammers

Biopolymer formulation, in particular a polysaccharide-containing water in oil emulsion, process for preparing such emulsions and process for concentrating these emulsions. Aqueous systems thickened by the incorporation of biopolymer emulsions.

Biopolymer formulations and processes for preparing them

A process for the preparation of an oil-soluble, star-shaped product having viscosity index-improving and dispersant properties, comprising modifying a hydrogenated star-shaped polymer wherein said arms are hydrogenated homopolymers and copolymers of conjugated dienes and mono-alkenyl arenes, and wherein the hydrogenated polymer is metallated with an organolithium compound in the presence of a metallation promoter, and subsequently reacted with a vinyl pyridine or a carbonyl group containing organic compound.

Process for the preparation of oil-soluble hydrogenated modified

Lubricating oil additives having superior viscometric and detergent properties are prepared by polymerizing an alkyl(meth)acrylate in a solvent containing a star-shaped polymer.

Preparation of a lubricating oil additive, an additive thus prepared

A modified hydrogenated star-shaped polymer comprising a nucleus, e.g., divinylbenzene, with polymeric arms linked to it is prepared by grafting a hydrogenated star-shaped polymer with a nitrogen-containing polymerizable polar organic compound, e.g., 2-vinylpyridine or 4-vinylpyridine. Such polymers are useful as viscosity index improvers for lube oil compositions, and also possess dispersancy.

Lube oil additive

A viscosity index-improver for lubricating oil compositions is disclosed. This viscosity index improver is a hydrogenated star-shaped polymer comprising a poly(poly-alkenyl coupling agent) nucleus and at least four polymeric arms linked to the nucleus wherein the arms are hydrogenated homopolymers and copolymers of conjugated dienes, hydrogenated copolymers of conjugated dienes and monoalkenyl arenes, or mixtures thereof.

Hydrogenated star-shaped polymer

A viscosity index-improver for lubricating oil compositions is disclosed. This viscosity index improver is a hydrogenated star-shaped polymer comprising a poly(poly-alkenyl coupling agent) nucleus and at least four polymeric arms linked to the nucleus wherein the arms are hydrogenated homopolymers and copolymers of conjugated dienes, hydrogenated copolymers of cojugated dienes and monoalkenyl arenes, or mixtures thereof.

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Amsterdam, Netherlands

Rudolf J Eckert