Antifouling coating composition, antifouling coating film formed using said composition, and coated article having antifouling coating film on surface

Abstract

The present invention provides antifouling coating compositions having excellent long-term storage stability and provides an antifouling coating composition that can maintain the stable dissolution and antifouling performance of a coating film without causing coating film defects such as cracks in seawater for a long term, such that an antifouling coating film having increased environmental safety can be formed. The present invention provides an antifouling coating composition containing: (A) a triorganosilyl ester-containing copolymer obtained from a mixture of (a) a triorganosilyl(meth)acrylate monomer represented by general formula (1): (here, R 1 is a hydrogen atom or a methyl group; and R 2 , R 3 , and R 4 are the same or different from each other and each represents a C 3-6 alkyl group branched at the α-position or a phenyl group) and (b) an ethylenically unsaturated monomer copolymerizable with the triorganosilyl(meth)acrylate monomer; and (B) calcium sulfate hydrate.

1 . An antifouling coating composition comprising:
 (A) a triorganosilyl ester-containing copolymer obtained from a mixture of
 (a) a triorganosilyl(meth)acrylate monomer represented by general formula (1): 
   
       
         
           
           
               
               
           
         
       
       (wherein R1 is a hydrogen atom or a methyl group; and R2, R3, and R4 are the same or different from each other and each represents a C 3-6  alkyl group branched at an α-position or a phenyl group) and
   (b) an ethylenically unsaturated monomer copolymerizable with the triorganosilyl(meth)acrylate monomer; and   
 (B) calcium sulfate hydrate, 
 wherein a content of the calcium sulfate hydrate (B) when converted to a solid content is from 5 to 50% by mass with respect to a solid content of the antifouling coating composition. 
 
     
     
         2 . The antifouling coating composition according to  claim 1 , wherein a content proportion of the triorganosilyl ester-containing copolymer (A) to the calcium sulfate hydrate (B), is from 0.4 to 3 by mass ratio when converted to a solid content. 
     
     
         3 . The antifouling coating composition according to  claim 1 , wherein the calcium sulfate hydrate (B) is a dihydrate. 
     
     
         4 . A coated object having, on a surface thereof, an antifouling coating film formed using the antifouling coating composition according to  claim 1 .