FIELD: chemistry of polymers. SUBSTANCE: at least one H-(C8-C30--alkyl) methacrylate and maleic anhydride copolymer containing alternating monomer units of methacrylate and maleic anhydride has alternation degree of at least 85%. Present invention also describes method of preparing copolymer and composition of hydrocarbon oil. EFFECT: copolymers, compositions of hydrocarbon oil based thereon used as addition agents that improve fluidity.
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