Abstract: The authors have synthesized methyl tributyltin maleate (MTBTM)and ethyl tributyltin maleate (ETBTM). Two monomers were copolymerized with vinyl acetate (VAc) and styrene (St) alternatively.The copolylmerization conditions, such as temperature,concentration of monomers and solvents were examined.The conversion of coplymerization of MTBTM with was was found up to 88%.Copolymers were characterized by IR, ¹H-NMR, elementarl analysis and intrinsic viscosity.Copolymers of MTBTM-VAc, ETB-TM-VAc, ETBTM-St and ETBTM-St are soluble in many organic solvents and the first two are transparant elastomers, while the last two are white and brittle solids.