Photopolymerizable and photocleavable resins and low shrink and low stress composite compositions

Abstract

A photopolymerizable and photocleavable (P&P) resin monomer is derived from a reactive photoresponsible moiety via various linkages to form photopolymerizable monomers and/or oligomers.

1 ) A photopolymerizable and photocleavable (P&P) resin monomer is derived from a reactive photoresponsible moiety via various linkages to form photopolymerizable monomers and/or oligomers.  
     
     
         2 ) As claimed in  1 , such reactive and photoresponsive moiety more preferably can be α-hydroxyalkylphenone (HP) or any other functional photoresponsive moiety.  
     
     
         3 ) As claimed in  1 , such P&P resin monomer can be constructed via any linkages such as ester, carbonate, urea, urethane, ether et al.  
     
     
         4 ) As claimed in  1 , such P&P resin monomer have to bear at least two photopolymerizable groups.  
     
     
         5 ) As claimed in  2 , the photopolymerizable group can by vinyl, vinylether, acrylate, methacrylate, or their combination.  
     
     
         6 ) As claimed in  1 , such photopolymerizable and photocleavable (P&P) resin monomer can be liquid and/or semicrystalline solid.  
     
     
         7 ) As claimed in  6 , the photopolymerizable and photocleavable (P&P) resin monomer can be used with any other conventional resins including BisGMA, TEGDMA, UDMA, et al.  
     
     
         8 ) As claimed in  7 , the content of such photopolymerizable and photocleavable (P&P) resin monomer in other resin mix range from 1% to 99%, preferably 20-70%, more preferably 30-50%, wt/wt/.  
     
     
         9 ) As claimed in  3 , various coupling agents such as primary diols, diamine, diacid, diusocynate, et al can be used.  
     
     
         10 ) As claimed in  9 , the coupling agent could aliphatic or aromatic or both  
     
     
         11 ) As claimed in  10 , the different coupling agent could be used.  
     
     
         12 ) As claimed in  11 , different amounts of agents could be used to control viscosity of the resulting P&P resin monomers.  
     
     
         13 ) As claimed in  12 , inert polymerizable resin could be introduced to control viscosity.