Studies on tri-n-butyltin methacrylate (TBTM). IV. Antifouling compositions based on copolymers of tri-n-butyltin methacrylate and methyl methacrylate

Based on reactivity ratios reported earlier, a number of copolymers of methyl methacrylate and tri-n-butyltin methacrylate has been prepared. Release of tri-n-butyltin oxide into seawater from the copolymer films has been determined at 30°C as a function of time. The copolymers behave in a typical manner—an initial increase in leaching rate followed by a steady state which is reached after about 60 days. Pigmented copolymer films behave in a similar manner, even though the overall leaching rate is slightly lower. Release rate data are also presented for a typical antifouling paint formulation.