NEW VISCOSITY INDEX IMPROVING AGENTS HAVING CERTAIN MOLECULAR WEIGHT DISTRIBUTIONS Russian patent published in 2022 - IPC C08F265/06 C10M145/14 C08F220/18 

FIELD: lubricants.

SUBSTANCE: invention relates to comb polymers based on polyalkyl(meth)acrylate, production and use thereof. Disclosed are polyalkyl(meth)acrylate-based comb polymers, consisting of (wt. %): (meth)acrylic acid ester with hydroxylated hydrogenated polybutadiene (10–25), C₄-C₁₈-alkyl acrylates (0–5), methyl methacrylate (0–0.3), n-butyl methacrylate (60–75), C₁₀-C₃₀-alkyl(meth)acrylates and styrene monomers (0–2) having weight-average molecular weights of 700,000 g/mol or more, and number average molecular weights equal to 130,000 g/mol or more. Also disclosed is a method of producing said polymers and lubricating compositions containing such comb polymers.

EFFECT: disclosed comb polymers enable to obtain additives which provide high thickening efficiency and significant fuel savings with low content of the additive.

14 cl, 10 dwg, 6 tbl