Holographic storage medium comprising polyfunctional epoxy monomers capable of undergoing cationic polymerization

Abstract

Disclosed is a holographic recording medium. The novel holographic recording mediums disclosed herein comprises: a) at least one polyfunctional epoxide monomer or oligomer which undergoes acid initiated cationic polymerization. Each epoxide in the monomer or oligomer is linked by group comprising a siloxane to a silicon atom and each monomer or oligomer has an epoxy equivalent weight of greater than about 300 grams/mole epoxide; b) a binder which is capable of supporting cationic polymerization; c) an acid generator capable of producing an acid upon exposure to actinic radiation; and optionally d) a sensitizer.

1 . A compound represented by the following structural formula: 
       
         
           
           
               
               
           
         
         wherein:
 X 1  and X 2  are independently each oxygen or a substituted or unsubstituted C 1-12  alkylene, C 1-12  cycloalkylene, C 1-12  arylalkylene, or arylene group, —Y 1 —[O—Y 1 ] p —, —Y 1 —Si(R z ) 2 —Y 1 —, —Y 1 —Si(R z ) 2 —Y 1 —O—Y 1 —Si(R z ) 2 —Y 1 —, or —Y 1 —Si(R z ) 2 —Y 1 —Si(R z ) 2 —Y 1 —; 
 each R z  is independently a substituted or unsubstituted C 1-12  alkyl group, C 1-12  cycloalkylalkyl group, aryl substituted C 1-12  alkyl group or aryl group; 
 each Y 1  is independently a C 1-12  alkylene group; 
 p is an integer from 1 to 5; 
 each R a  is independently a substituted or unsubstituted aliphatic group or a substituted or unsubstituted aryl group; 
 n is 1, 2, 3 or 4; 
 R is a substituted or unsubstituted aliphatic group, a substituted or unsubstituted aryl group or is represented by a structural formula selected from: 
 
       
       
         
           
           
               
               
           
         
         
           each R b  is independently an epoxide substituted aliphatic group; and 
           R c  is H, an unsubstituted aliphatic group, a substituted aliphatic group, an unsubstituted aryl group, a substituted aryl group, a substituted siloxane group, an unsubstituted siloxane group, a substituted polysiloxane group or an unsubstituted polysiloxane group.