FIELD: chemistry of polymers, more particularly as modifier and stabilizer of drilling muds and mineral dispersions. SUBSTANCE: (meth)acrylic acid- methacryl amide-acrylic acid-nitrile copolymer has molecular weight of 2,5•103÷ 2,5•106 conventional units and monomer units ratio of 10.0-50.0: 20.0-55.0: 20.0-50.0, respectively. EFFECT: improved properties of the modifier and stabilizer. 4 tbl
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