Organotin acrylate and organotin polysiloxane antifouling coating composition

Claim 1

A marine antifouling coating composition comprising: an organotin acrylate coresin comprising at least one polymeric precursor having the formula ##STR4## where R 1 , R 2 and R 3 are independently selected from the group consisting of alkyl, cycloalkyl and aryl radicals and R 1 , R 2 and R 3 collectively contain up to 18 carbon atoms and where R 4 is a polymerizable radical selected from the group consisting of vinyl, α-methylvinyl and vinylphenyl radicals, the organotin acrylate coresin being in the range of from about 10 to about 25% by weight; an organotin polysiloxane coresin comprising at least one polymeric precursor having the formula ##STR5## where m is an average of up to about ten, each X is independently selected from the group consisting of R 5 and Y; where each R 5 is selected from the group consisting of hydrogen and alkyl and alkoxyalkyl radicals containing less than six carbon atoms; where each Y is a trisubstituted tin radical having the formula ##STR6## where R 6 , R 7 and R 8 are independently selected from the group consisting of alkyl, cycloalkyl and aryl radicals and R 6 , R 7 and R 8 contain collectively up to 18 carbon atoms; the organotin polysiloxane coresin being in the range of from about 2 to about 20% by weight; solvent for the organotin acrylate and organotin polysiloxane coresin in the range of from about 20% to about 50% by weight; and the balance in the range of from about 10% to about 50% by weight comprising marine paint and toxicant agents selected from the group consisting of pigment powders, fillers, plasticizers, antisettling agents, copper powder, cuprous salts, zinc oxide and algicides.