Aqueous electrodeposition paints, use thereof in methods for coating electrically conductive substrates, and use of bismuth compounds in said aqueous electrodeposition paints

Abstract

Electrocoat material comprising bismuth compounds, comprising (A) at least one self-crosslinking and/or externally crosslinking binder containing (potentially) cationic or anionic groups and reactive functional groups which (i) with themselves or with complementary reactive functional groups in the self-crosslinking binder, or (ii) in the case of the externally crosslinking binder, with complementary reactive functional groups present in crosslinking agents (B) are able to undergo thermal crosslinking reactions, (B) if desired, at least one crosslinking agent comprising the complementary reactive functional groups, and (C) at least one bismuth compound.

1 . An electrocoat (EC) material comprising a bactericide comprising a bismuth compounds, the material comprising 
 (A) at least one crosslinking binder comprising groups convertible to cationic or anionic groups and reactive functional groups able to undergo thermal crosslinkinq reactions 
 (i) with themselves or with complementary reactive functional groups in a self-crosslinking binder, or  
 with complementary reactive functional groups present in a crosslinking agents (B)  
   (B) optionally at least one crosslinking agent comprising complementary reactive functional groups, and    (C) a bactericide comprising at least one bismuth compound.    
   
   
       2 . The material of  claim 1 , comprising, from 0.05 to 4% by weight of bismuth compound (C), based on material solids.  
   
   
       3 . The material of  claim 1 , wherein the bismuth compound comprises a bismuth carboxylates.  
   
   
       4 . The material of  claim 3 , wherein the bismuth carboxylates are formed from carboxylic acids selected from the group consisting of aliphatic carboxylic acids and aromatic carboxylic acids.  
   
   
       5 . The material of  claim 4 , wherein the aliphatic carboxylic acids are monofunctional.  
   
   
       6 . The material of  claim 4 , wherein the bismuth compound (C) is bismuth ethylhexanoate.  
   
   
       7 . The material of  claim 4 , wherein the bismuth compound (C) is bismuth subsalicylate.  
   
   
       8 . The material of  claim 7 , wherein the bismuth subsalicylate (C) has a bismuth content of from 56 to 60% by weight.  
   
   
       9 . The material of claims  1 , wherein the binder (A) comprises groups convertible to cationic groups.  
   
   
       10 . The material of claims  1 , wherein the reactive functional groups comprise hydroxyl groups.  
   
   
       11 . The material of claims  1 , wherein the complementary reactive functional groups comprise blocked isocyanate groups.  
   
   
       12 . The material of claims  1 , comprising a crosslinking agents (B) comprising a blocked polyisocyanate.  
   
   
       13 . The material of  claim 1 , further comprising at least one additive (D).  
   
   
       14 . The material of  claim 13 , wherein the additive (D) is a pigment.  
   
   
       15 . The material of  claim 14 , wherein the pigments (D) are selected from the group consisting of color pigments, effect pigments, electrically conductive pigments, magnetically shielding pigments, fluorescent pigments, extender pigments, and anticorrosion pigments, are organic and inorganic.  
   
   
       16 . A process for preparing an electrocoat material as claimed in  claim 1 , comprising adding at least one bactericide comprising a bismuth carboxylates to a conventional electrocoat material.  
   
   
       17 . The process of  claim 16 , wherein the bismuth carboxylate is selected from the group consisting of bismuth ethylhexanoate, bismuth subsalicylate. and mixtures comprising at least one of the foregoing.  
   
   
       18 . The use of an electrocoat material as claimed in  claim 1  for producing electrocoats and/or multicoat paint systems by wet-on-wet techniques.