METAL CROSSLINKED ORGANOPOLYSILOXANE THIO BLOCK VINYL COPOLYMER AND ANTIFOULING COATING COMPOSITION CONTAINING THE COPOLYMER

摘要

Provided is a silicone based copolymer which when applied to a ship exhibits excellent long term antifouling effect even in a dry wet alternate portion or in a portion near the surface of the water and which has excellent mechanical strengths and recoatability. The silicone based copolymer can attain high antifouling performance even when no antifouling agent is added. Also provided is anantifouling coating composition that contains the copolymer. The silicone based copolymer is a metal crosslinked organopolysiloxane thio block vinyl copolymer [D] obtained by crosslinking an organopolysiloxane thio block vinyl copolymer [C] with a divalent metal [M] said copolymer [C] comprising a carboxylic acid containing vinyl copolymer block [A] composed of both constituent unitsderived from a polymerizable unsaturated carboxylic acid (a1) and constituent units derived from at least one other polymerizable unsaturated monomer (a2) copolymerizable with the carboxylic acid (a1) and a specific organopolysiloxane thio block [B].