Increasing the self-polishing properties of antifouling paints

Abstract

Substituted 1,4,2-oxathiazines and their mono- and di-oxides, disclosed in WO-A-9505739, are used as additive to increase the self-polishing properties of antifouling paints. The additive is used in an amount of 0.5 to 9.9 wt %, based on the total weight of the dry mass of the composition, preferably 1 to 8 wt %, most preferably 2 to 4 wt %. The preferred additive is 3-(3,4-dichlorophenyl)-5,6-dihydro-1,4,2-oxathiazine dioxide.

1 . Use of substituted 1,4,2-oxathiazines and their mono- and di-oxides as additive to increase the self-polishing properties of antifouling paints, the substituent in position 3 representing (a) phenyl; phenyl substituted with 1 to 3 substituents independently selected from hydroxyl, halo, C1-12 alkyl, C5-6 cycloalkyl, trihalomethyl, phenyl, C1-5 alkoxy, C1-5 alkylthio, tetrahydropyranyloxy, phenoxy, C1-4 alkylcarbonyl, phenylcarbonyl, C1-4 alkylsulfinyl, carboxy or its alkali metal salt, C1-4 alkyloxycarbonyl, C1-4 alkylaminocarbonyl, phenylaminocarbonyl, tolylaminocarbonyl, morpholinocarbonyl, amino, nitro, cyano, dioxolanyl or C1-4 alkyloxyiminomethyl; naphthyl; pyridinyl; thienyl; furanyl; or thienyl or furanyl substituted with one to three substituents independently selected from C1-4 alkyl, C1-4 alkyloxy, C1-4 alkylthio, halo, cyano, formyl, acetyl, benzoyl, nitro, C1-4 alkyloxycarbonyl, phenyl, phenylaminocarbonyl and C1-4 alkyloxyiminomethyl; or (b) a substituent of generic formula  
       
         
           
           
               
               
           
         
       
       wherein X is oxygen or sulphur; Y is nitrogen, CH or C(C1-4 alkoxy); and the C6 ring may have one C1-4 alkyl substituent; a second substituent selected from C1-4 alkyl or benzyl being optionally present in position 5 or 6; and the additive being used in an amount of 0.5 to 9.9 wt %, based on the total weight of the dry mass of the composition.  
     
     
         2 . Use according to  claim 1 , wherein the additive is used in an amount of 1 to 8 wt %, based on the total weight of the dry mass of the composition.  
     
     
         3 . Use according to  claim 2 , wherein the additive is used in an amount of 2 to 4 wt %, based on the total weight of the dry mass of the composition.  
     
     
         4 . Use according to any one of  claims 1  to  3 , wherein the additive is 3-(3,4-dichlorophenyl)-5,6-dihydro-1,4,2-oxathiazine dioxide.  
     
     
         5 . Use according to any one of  claims 1  to  4 , wherein the self-polishing paint composition essentially comprises 
 (i) a trialkyltin (meth)acrylate copolymer;  
 (ii) the additive.  
 
     
     
         6 . Use according to any one of  claims 1  to  4 , wherein the self-polishing paint composition essentially comprises 
 (i) a first component selected from one or more rosin-based components;  
 (ii) a copolymer as binder;  
 (iii) at least one sparingly soluble metalliferous pigment;  
 (iv) the additive.  
 
     
     
         7 . Use according to any one of  claims 1  to  4 , wherein the self-polishing paint composition essentially comprises 
 (i) a first component selected from one or more rosin-based components;  
 (ii) a hydrophilic binder;  
 (iii) at least one sparingly soluble metalliferous pigment;  
 (iv) the additive.  
 
     
     
         8 . Use according to any one of  claims 1  to  4 , wherein the self-polishing paint composition essentially comprises 
 (i) a (co)polymer based on copper acrylate;  
 (ii) optionally, one or more rosin-based components;  
 (iii) at least one sparingly soluble metalliferous pigments;  
 (iv) the additive.  
 
     
     
         9 . Use according to any one of  claims 6  to  8 , wherein the self-polishing paint composition comprises cuprous oxide as representing at least 25 wt % of the sparingly soluble metalliferous pigments