Vinyl monomers having chelating functionality

Abstract

The present invention provides novel polymerizable monomers having chelating functionality and processes to make them. In particular, the novel monomers are ethylenically unsaturated aminocarboxylates and are prepared by reacting ethylenediamine triacetic acid or its salt with an ethylenically unsaturated monomer. The ethyleneically unsaturated monomer may be a polymerizable vinyl monomer selected from (o-, p-, m-)DVBMO, allyl glycidyl ether, and glycidyl (meth)acrylate.

We claim: 
     
         1 . An ethylenically unsaturated aminocarboxylate monomer having the following general Structure I: 
       
         
           
           
               
               
           
         
         wherein X 1 , X 2  and X 3  are each, independently, hydrogen or a mono- or polyvalent cation and the total charge on the monomer is zero; and one, and only one, of R 1  and R 2  is an —OH group, and the other is a polymerizable arm comprising a vinyl group and derived from one or more ethylenically unsaturated monomers. 
       
     
     
         2 . The ethylenically unsaturated aminocarboxylate monomer according to  claim 1 , wherein the polymerizable arm is derived from a (o-, p-, m-)DVBMO monomer and has the following structure: 
       
         
           
           
               
               
           
         
         Wherein R 3  is a polymerizable ethylenically unsaturated group located at the ortho-, para-, or meta-substituted position of the benzene ring. 
       
     
     
         3 . The ethylenically unsaturated aminocarboxylate monomer according to  claim 2 , wherein R 3  is —CH═CH 2 . 
     
     
         4 . The ethylenically unsaturated aminocarboxylate monomer according to  claim 1 , wherein the polymerizable arm is derived from an allyl glycidyl ether monomer and has the following structure: 
       
         
           
           
               
               
           
         
       
     
     
         5 . The ethylenically unsaturated aminocarboxylate monomer according to  claim 1 , wherein the polymerizable arm is derived from a glycidyl (meth)acrylate monomer and has the following structure: 
       
         
           
           
               
               
           
         
         wherein R 3  is hydrogen or —CH 3 . 
       
     
     
         6 . The ethylenically unsaturated aminocarboxylate monomer according to  claim 1 , wherein the mono- or polyvalent cation is at least one cation selected from the group consisting of: Na + , K + , NH 4   + , organic ammonium ions, Ca 2+ and Mg 2+ . 
     
     
         7 . A process for preparing the ethylenically unsaturated aminocarboxylate monomer according to  claim 1 , comprising reacting ethylenediamine triacetic acid or its salt with an ethylenically unsaturated monomer. 
     
     
         8 . The process according to  claim 6 , wherein the ethylenically unsaturated monomer is a polymerizable vinyl monomer selected from the group consisting of:
 (o-, p-, m-)DVBMO, allyl glycidyl ether, glycidyl (meth)acrylate, and mixtures thereof.   
     
     
         9 . The process according to  claim 6 , wherein said reacting step occurs in the presence of a phase transfer catalyst.