Wire-coating composition based on new polyester amide imides and polyester amides

Abstract

Wire-coating composition containing resins with nucleophilic groups as well as possibly amide group-containing resins which are capable of crosslinking with one another, comprising (A) 5 to 95% by weight of at least one resin with nucleophilic groups selected from the group consisting of OH, NHR, SH, carboxylate and CH-acidic groups, (B) 0 to 70% by weight of at least one amide group-containing resin and (C) 5 to 95% by weight of at least one organic solvent, wherein the resins of either component (A) or component (B) contain α-carboxy-β-oxocycloalkyl carboxylic acid amide groups and the percent by weight of (A)-(C) adds up to 100 percent. The wire-coating compositions according to the invention allow a significant increase in the enamelling speed without losing the positive properties of standard wire enamels.

1 . A wire-coating composition based on resins with nucleophilic groups comprising 
 (A) 5 to 95% by weight of at least one resin with nucleophilic groups selected from the group consisting of OH, NHR, SH, carboxylate and CH-acidic groups,    (B) 0 to 70% by weight of at least one amide group-containing. resin and    (C) 5 to 95% by weight of at least one organic solvent, wherein the resins of either component (A) or component (B) contain α-carboxy-β-oxocycloalky carboxylic acid amide groups, and the percent of by weight of (A)-(C) adds up to 100 percent.    
   
   
       2 . The composition according to  claim 1  comprising 
 (A) 5 to 60% by weight of at least one resin with nucleophilic groups selected from the group consisting of OH, NHR, SH, carboxylate and CH-acidic groups,    (B) 1 to 50% by weight of at least one amide group-containing resin,    (C) 5 to 90% by weight of at least one organic solvent,    (D) 0 to 10% by weight of at least one catalyst,    (E) 0 to 20% by weight of at least one phenolic resin and/or melamine resin and/or blocked isocyanate,    (F) 0 to 3% by weight of conventionally used additives or auxiliaries,    (G) 0 to 70% by weight of nano-scale particles, and    (H) 0 to 60% by weight of conventionally used fillers and/or pigments,    wherein the resins of either component (A) or component (B) contain the α-carboxy-β-oxocycloalkyl carboxylic acid amide groups, and the percent by weight of (A)-(H) adds up to 100 percent.    
   
   
       3 . The composition according to  claim 2  wherein component B) contains α-carboxy-β-oxocycloalkyl carboxylic acid amide groups.  
   
   
       4 . The composition according to  claim 1  wherein at least one polyester and /or polyester imide is used as component A).  
   
   
       5 . The composition according to  claim 2  wherein the particles of component G) have an average particle size in the range of 1 to 300 nm.  
   
   
       6 . The composition according to  claim 5  wherein the particles based on an element-oxygen network comprising elements from the series consisting of silicon, zinc, aluminium, tin, boron, germanium, gallium, lead, the transition metals and the lanthanides and actinides, and the surface of the element-oxygen network of these particles being modifiable with reactive organic groups.  
   
   
       7 . The composition according to  claim 1  comprising element-organic compounds.  
   
   
       8 . The composition according to  claim 7  wherein ortho-titanic acid esters, ortho-zirconic acid esters, titanium tetralactate, hafnium and silicon compounds and silicone resins are used as element-organic compounds.  
   
   
       9 . A process of coating electrically conductive wires comprising the steps of applying the composition according to  claim 1  and curing said coating composition at an elevated temperature to produce a cured coating.  
   
   
       10 . The process according to  claim 9  wherein the wire is pre-coated.  
   
   
       11 . The process according to  claim 9  wherein the coating composition is applied as a single-layer and/or as a base coat, middle coat and/or top coat within a multi-layer coating.  
   
   
       12 . Electrically conductive wire coated with the coating composition according to  claim 1  and cured.