By the method of radical copolymerization of o-acetylphenyl(meth)acrylates with styrene the new carbonyl copolymers have been prepared. It has been detected that an increase in quantity of acetylphenyl(meth)acrylates in the reaction mixture leads to the rise of the copolymerization rate. The copolymerization constant of o-acetylphenyl acrylate is lower than that of o-acetylphenyl(meth)acrylate. The reasons of the above-mentioned conclusions have been revealed.