METHOD FOR PRODUCTION OF POLYALKYLMETHACRYLATE ADDITIVE (VARIANTS) AND POLYALKYLMETHACRYLATE ADDITIVE (VARIANTS) Russian patent published in 2006 - IPC C08F220/10 C08F120/10 C10M145/14 

FIELD: polymer chemistry, in particular production of polyalkylmethacrylate additives to mineral oils.

SUBSTANCE: claimed additive is obtained by (co)polymerization of alkylmethacrylate in inert solvent medium in presence of laurylmercaptane and polymerization initiator at 110-130°C. As alkylmethacrylate ester of general formula CH₂=C(CH₃)COOR is used, wherein R represents C₈-C₁₀-, C₁₂-C₁₄-, C₁₂-C₁₈-, C₁₆-C₂₀-alkyl, obtained by transesterification of methylmethacrylate from fraction of high fatty C₈-C₁₀-, C₁₂-C₁₄-, C₁₂-C₁₈-, C₁₆-C₂₀-alcohols in presence of alkali catalyst such as potassium carbonate and mixture of phenol inhibitors such as p-methoxyphenol and 2,6-ditertbuthyl-4-methylphenol in ratio of (5.0-6.0):1, in air flow, and in methylmethacrylate/high alkohol molar ratio of (2.0-2.5):1. In one embodiment ester of general formula CH₂=C(CH₃)COOR is polymerized with monomer of monomer mixture selected from group containing methylmethacrylate, buthylmethacrylate, 2-ethylhexylmethacrylate, styrene, alkylmaleinate in laurylmercaptane/copolymerization initiator mass ratio of (0.013-0.075):1. Polyalkylmethacrylate additives having desired properties also are disclosed.

EFFECT: effective polyalkylmethacrylate additives to mineral oils of improved characteristic and simplified method for production thereof.

9 cl, 124 ex, 4 tbl