Method and compositions for applying multiple overlying organic pigmented decorations on ceramic substrates

Abstract

A pigmented curable composition adapted for decorating ceramic substrates (e.g., glass bottles) comprises curable organic binder and solid spherical particles (glass or polymer) having diameters of 10 to 50 microns for facilitating overprinting of additional layers. The preferred embodiment comprises: (a) reactive organic resin component in which epoxy groups comprise the major reactive functionality; (b) amino-functional curing agent; (c) blocked polyisocyanate; and (d) 5 to 35 percent solid spherical particles having diameters of 10 to 50 microns.

1 . A one-component pigmented curable composition adapted for decorating ceramic substrates, said composition comprising: curable organic binder; and 5 to 50 weight percent rigid substantially spherical organic particles having average diameters of 5 to 50 microns, percentages based upon total weight of the composition, wherein the curable organic binder comprises polyepoxy-functional reactive resin wherein the particles are not expanded or expandable.  
   
   
       2 . The composition of  claim 1 , wherein the polyepoxy-functional reactive resin contains an average of epoxy groups per molecule greater than 1.0.  
   
   
       3 . The composition of  claim 1 , wherein the polyepoxy-functional reactive organic resin comprises polyglycidyl ether of polyhydric alcohol.  
   
   
       4 . The composition of  claim 3 , wherein the polyhydric alcohol is bisphenol A.  
   
   
       5 . A pigmented curable composition adapted for decorating ceramic substrates, said composition comprising: curable organic binder, and 5 to 50 weight percent rigid substantially spherical organic particles having average diameters of 5 to 50 microns, percentages based upon total weight of the composition, wherein the curable organic binder further comprises an amino-functional curing agent selected from the group consisting of melamine, 2,4,6-tris(alkoxycarbonylamino)-1,3,5-triazine where each alkoxy independently contains from 1 to 4 carbon atoms, a compound represented by the formula:  
     
       
         
         
             
             
         
       
     
     wherein: 
 R 1 , R 2 , and R 3  each independently represents hydrogen, alkyl containing from 1 to 3 carbon atoms, or hydroxyalkyl containing from 1 to 3 carbon atoms,  
 R 4  represents hydrogen, phenyl, cyano, acetyl, or  
                     
 R 5  represents O, S, or NH, and  
 R 6  and R 7  each independently represents hydrogen, alkyl containing from 1 to 3 carbon atoms, hydroxyalkyl containing from 1 to 3 carbon atoms, or phenyl, and a mixture of two or more thereof and wherein the particles are not expanded or expandable.  
 
   
   
       6 . The composition of  claim 5 , wherein the amino-functional curing agent comprises dicyandiamide.