Abstract Copolymers of tri‐n‐butyltin‐α‐chloroacrylate (TCA) with 2‐hydroxyethyl methacrylate (HEMA) and 2‐hydroxypropyl methacrylate (HPMA) were synthesized in solution at 55°C using azobisisobutyronitrile as initiator. Copolymer compositions were determined by tin analysis. Monomer reactivity ratios were calculated by the Kelen‐Tüdős method. The copolymers were further characterized by IR, 1 H‐NMR, TGA, DSC, XRD and solubility. Biotoxicity studies of the copolymers are also reported. The copolymer system is compared with similar copolymers of tri‐n‐butyltín methacrylate.