| abstract |
FIELD: chemistry. n SUBSTANCE: invention relates to a polymer dispersion for improving viscosity index of engine oil and a method for production thereof. The dispersion contains: A) at least one dispersed polyolefin, B) at least one dispersing component, C) mineral oil and D) at least one glycerol ester obtained from unsaturated carboxylic acids having 8-30 carbon atoms. Component (A) contains one or more olefin copolymers, hydrogenated polyisoprene, a hydrogenated butadiene/isoprene copolymer or a hydrogenated copolymer of butadiene/isoprene and styrene. Component (B) is a copolymer which contains one or more blocks A and one or more blocks X, wherein block A is a series of olefin copolymerisates, a series of hydrogenated polyisoprene, hydrogenated butadiene/isoprene copolymers or hydrogenated copolymers of butadiene/isoprene and styrene, and block X is a polyacrylate-, polymethacrylate-, styrene-, α-methylstyrene- or N-vinyl-heterocyclic series and/or series of mixtures of polyacrylate-, polymethacrylate-, styrene-, α-methylstyrene- or N-vinyl-heterocyclic rings. n EFFECT: preparation of dispersions according to the invention requires relatively less power consumption and the polymer dispersions have good low-temperature properties. n 35 cl, 1 ex |