Depot polymerization starter beads

Abstract

The invention relates to polymer beads having a high content of diacyl peroxides. A prolongation of the pot life in reaction resins based on high-boiling methacrylate esters is achieved due to this high content of peroxides.

1 - 4 . (canceled)  
     
     
         5 . A bead, comprising: 
 (A) a suspension copolymer; and    (B) from 1-10% by weight of at least one polymerization initiator selected from the group consisting of peroxides and peroxide mixtures;    wherein said suspension copolymer comprises in copolymerized form the following components (a), (b) and (c): 
 (a) more than 1% by weight of a derivative of an unsaturated carboxylic acid of the formula (I),  
                     
  wherein 
 R 1 =H or CH 3 , and  
 R 2 =methyl, ethyl;  
 
 (b) more than 1% by weight of a derivative of an unsaturated carboxylic acid of the formula (II),  
                     
  wherein 
 R 3 =H or CH 3 , and  
 R 4 =n-butyl, isobutyl; and  
 
 (c) from 0-15% of one or more monomers copolymerizable with the monomers (a) or (b);  
   wherein a sum of the amounts of (a), (b), (c) and (B) is 100%.    
     
     
         6 . The bead according to  claim 5 , wherein said suspension copolymer does not have a shell structure.  
     
     
         7 . The bead according to  claim 5 , wherein said polymerization initiator is present in an amount of from 3-10% by weight.  
     
     
         8 . The bead according to  claim 5 , wherein polymerization initiator is present in an amount of from 5-10% by weight.  
     
     
         9 . The bead according to  claim 5 , wherein said polymerization initiator is a peroxide.  
     
     
         10 . The bead according to  claim 5 , wherein said polymerization initiator is a mixture of peroxides.  
     
     
         11 . The bead according to  claim 5 , wherein said polymerization initiator is a benzoyl peroxide.  
     
     
         12 . The bead according to  claim 5 , wherein said polymerization initiator is a diacyl peroxide.  
     
     
         13 . The bead according to  claim 5 , wherein component (c) is present.  
     
     
         14 . The bead according to  claim 5 , wherein component (c) is a styrene compound or a maleic acid compound.  
     
     
         15 . The bead according to  claim 5 , having an average diameter of from 50 to 200 μm.  
     
     
         16 . A composition, comprising: 
 a polymerizable monomer and the bead according to  claim 5 .    
     
     
         17 . A floorcovering composition, comprising: 
 the bead according to  claim 5 .    
     
     
         18 . A dental filling composition, comprising: 
 the bead according to  claim 5 .    
     
     
         19 . A cold-plastic road-marking composition, comprising: 
 the bead according to  claim 5 .    
     
     
         20 . A method of curing a reactive resin, comprising: 
 contacting the bead according to  claim 5  with a reactive resin.