| 摘要 |
FIELD: may be used as additive into lubrication oil. SUBSTANCE: hybrid copolymer comprises grafted copolymer which has monomer units of one or more nitrogen-containing monomer being grafted of polymer base comprising monomer units of one or more vinyl monomer, maleic anhydride and statistic copolymer. Vinyl monomer is chosen of group which comprises (met)acrylates, styrenes, derivatives of styrene, maleates and fumarates. Statistic copolymer comprises monomer units of one or vinyl monomer and monomer units of one or nitrogen-containing monomer. Content of residual nitrogen-containing monomer is not more than 2000 ppm as calculated for hybrid copolymer. EFFECT: improved quality of product. 9 cl, 2 tbla
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