a silyl acrylate compound containing a siloxy group having a bulky substituent is provided . the compound is represented by the following general formula : wherein r 1 and r 2 are independently a c 3 - 10 monovalent branched hydrocarbon group having a hydrocarbon group at α or β position or a monovalent c 3 - 10 cyclic hydrocarbon group ; r 3 , r 4 , and r 5 are independently an unsubstituted or substituted c 1 - 20 hydrocarbon group or a siloxy group represented by the following general formula : — osir 7 r 8 r 9 wherein r 7 , r 8 , and r 9 are independently an unsubstituted or substituted c 1 - 20 hydrocarbon group ; and r 6 is hydrogen atom or methyl group . this compound is hydrolyzed at a reduced speed , and use of a polymer obtained by copolymerization with an alkyl methacrylate is capable of suppressing attachment of marine organisms to the ship with no or reduced biocide , and this polymer is useful for a hydrolytic self - polishing paint .