DISPERSERS AND DISPERSING ADDITION AGENTS BASED ON SELECTIVELY HYDROGENATED POLYMERS IMPROVING VISCOSITY INDEX Russian patent published in 2001 - IPC

FIELD: chemistry of polymers. SUBSTANCE: invention proposes DISPERSERS and dispersing addition agents improving viscosity index that involve polymers of coupled dienes subjected for hydrogenation and incorporation of functional groups. Dispersing substances involve the composition including copolymer of two different coupled dienes, copolymer of p-alkylstyrene and coupled diene or homopolymer of coupled diene. Polymers are hydrogenated selectively to synthesize polymers with exactly controlled level of unsaturation providing to introduce functional groups with high specificity. Also, invention proposes lubricant liquid, for example, mineral and synthetic oils with improved dispersity and/or viscous properties by using dispersing substances to be proposed. Also, invention proposes methods of modification of dispersity and/or viscous properties of lubricant liquids, for example, mineral and synthetic lubricant oils. Dispersing substance can include also carrying liquid to obtain concentrates of disperser. EFFECT: improved quality and properties. 37 cl, 5 tbl, 5 dwg