SILYL (METH) ACRYLATE COPOLYMERS, PROCESSES FOR PREPARING THE SAME, ANTIFOULING PAINT COMPOSITIONS CONTAINING THE SILYL (METH) ACRYLATE COPOLYMERS, ANTIFOULING COATING FILMS FORMED FROM THE ANTIFOULING PAINT COMPOSITIONS. ANTIFOULING METHODS USING THE ANTIFOULING PAINT COMPOSITIONS, AND HULLS OR UNDERWATER STRUCTURES COATED WITH THE ANTIFOULING COATING FILMS

摘要

Disclosed is a silyl (meth)acrylate copolymer whichcomprises 20 to 80 % by weight of (a) silyl(meth)acrylate constituent units represented by thefollowing formula (I), 0.01 to 40 % by weight of (b)acrylic unsaturated monomer constituent units representedby the following formula (II) and 5 to 79.99 % by weightof (c) unsaturated monomer constituent units other thanthe constituent units (a) and (b), with the proviso thatthe total amount of the constituent units (a), (b) and(c) is 100 % by weight, and which has a weight-averagemolecular weight, as measured by GPC, of not more than200, 000.(See formula I)wherein R1 is a hydrogen atom or a methyl group, and R2,R3 and R4 may be the same or different and are each analkyl group, a cycloalkyl group or a phenyl group whichmay have a substituent group.(See formula II)wherein R5 is a hydrogen atom or a methyl group, Z is anoxygen atom or -NR7, when Z is an oxygen atom, R6 is ahydroxyalkyl or hydroxycycloalkyl group which may have asubstituent group or a polyalkylene glycol grouprepresented by the formula -(R8O)n H (wherein R8 is analkylene group and n is an integer of 2 to 50), and whenZ is -NR7, R7 is an alkyl group which may be substitutedwith any of a halogen, a hydroxyl group, an amino group,a substituted amino group, an acyl group and an alkoxygroup, and R6 is a hydrogen atom.Also disclosed are a process for preparing the silyl(meth)acrylate copolymer, an antifouling paintcomposition comprising the copolymer, a coating filmformed from the paint composition, a hull with thecoating film, and an antifouling method using the paintcomposition. By the use of the silyl (meth)acrylatecopolymer, there can be produced an antifouling paintcapable of forming an antifouling coating film whichhardly suffers from occurrence of cracks, has excellentadhesive strength and thereby hardly suffers from peeling,can be favorably controlled in the hydrolysis rate, andis excellent in antifouling performance (antifoulingactivities) and long-term antifouling properties.