Radical polymerization initiator and method for producing polymers

Abstract

The present invention involves a radical polymerization initiator comprising an organotellurium compound represented by a formula (1), wherein R 1 represents an alkyl group or the like, each of R 2 and R 3 independently represents a hydrogen atom or the like, and each of R 4 , R 5 , and R 6 independently represents a hydrogen atom or the like. The present invention provides: a radical polymerization initiator that is useful for producing a polymer that includes a double bond at the molecular terminal; and a method for producing a polymer that utilizes the radical polymerization initiator.

1 . A radical polymerization initiator comprising an organotellurium compound represented by a formula (1), 
       
         
           
           
               
               
           
         
         wherein R 1  represents a group selected from an alkyl group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted aryl group, and 
         a substituted or unsubstituted heteroaromatic ring group, 
         each of R 2  and R 3  independently represents an atom or a group selected from a hydrogen atom, an aliphatic hydrocarbon group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heteroaromatic ring group, a halogen atom, 
         a carboxyl group, a hydrocarbyloxycarbonyl group, a cyano group, and an amide group, and each of R 4 , R 5 , and R 6  independently represents an atom or a group selected from a hydrogen atom, an aliphatic hydrocarbon group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heteroaromatic ring group, a halogen atom, 
         a carboxyl group, a hydrocarbyloxycarbonyl group, a cyano group, an amide group, and a group represented by a formula (2), 
         provided that two groups selected from R 2  to R 6  are optionally bonded to each other to form a ring other than an aromatic ring, 
       
       
         
           
           
               
               
           
         
         wherein R 7  represents a group selected from an alkyl group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted aryl group, and 
         a substituted or unsubstituted heteroaromatic ring group, each of R 8  and R 9  independently represents an atom or a group selected from a hydrogen atom, 
         an aliphatic hydrocarbon group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heteroaromatic ring group, a halogen atom, a carboxyl group, 
         a hydrocarbyloxycarbonyl group, a cyano group, and an amide group, and the wavy line represents that the group represented by the formula (2) is bonded to the carbon atom included in the formula (1) that forms the double bond. 
       
     
     
         2 . A method for producing a polymer comprising subjecting a radically polymerizable monomer to radical polymerization in a state in which the radical polymerization initiator according to  claim 1  is present in a polymerization system. 
     
     
         3 . The method for producing a polymer according to  claim 2 , wherein the radically polymerizable monomer is subjected to radical polymerization in a state in which an azo-based radical generator is further present in the polymerization system. 
     
     
         4 . The method for producing a polymer according to  claim 2 , wherein the radically polymerizable monomer is subjected to radical polymerization in a state in which light is applied to the polymerization system. 
     
     
         5 . The method for producing a polymer according to  claim 2 , wherein the radically polymerizable monomer is subjected to radical polymerization in a state in which a ditelluride compound represented by a formula (3) is further present in the polymerization system,
   R 10 Te—TeR 11   (3)
   wherein each of R 10  and R 11  independently represents a group selected from an alkyl group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted aryl group, and a substituted or unsubstituted heteroaromatic ring group.   
     
     
         6 . A polymer obtained by the method for producing a polymer according to  claim 2 . 
     
     
         7 . A polymer obtained by the method for producing a polymer according to  claim 3 . 
     
     
         8 . A polymer obtained by the method for producing a polymer according to  claim 4 . 
     
     
         9 . A polymer obtained by the method for producing a polymer according to  claim 5 .