Terminally modified acrylic polymer and method for producing terminallly modified acrylic polymer

Abstract

The present invention provides a terminally modified acrylic polymer having excellent thermal decomposition properties at low temperatures, an inorganic fine particle dispersed paste composition obtained by using the terminally modified acrylic polymer and a method of producing of the terminally modified acrylic polymer. The present invention pertains to a terminally modified acrylic polymer, which comprises a main chain composed of a repeating unit represented by the following formula (1), and a group represented by the following formula (2) at both ends or one end of the main chain, wherein R 1 represents hydrogen atom, an organic group having 1 or more carbon atoms or a derivative of an organic group having 1 or more carbon atoms; R 2 represents an organic group having 1 or more carbon atoms or a derivative of an organic group having 1 or more carbon atoms; R 3 and R 4 each represents hydrogen atom, an organic group having 1 or more carbon atoms or a derivative of an organic group having 1 or more carbon atoms; and n represents a positive integer.

1 . A terminally modified acrylic polymer,
 which comprises a main chain composed of a repeating unit represented by the following formula (1), and a group represented by the following formula (2) at both ends or one end of the main chain,   
       
         
           
           
               
               
           
         
         wherein R 1  represents hydrogen atom, an organic group having 1 or more carbon atoms or a derivative of an organic group having 1 or more carbon atoms; R 2  represents an organic group having 1 or more carbon atoms or a derivative of an organic group having 1 or more carbon atoms; R 3  and R 4  each represents hydrogen atom, an organic group having 1 or more carbon atoms or a derivative of an organic group having 1 or more carbon atoms; and n represents a positive integer. 
       
     
     
         2 . The terminally modified acrylic polymer according to  claim 1 ,
 which comprises a segment derived from a methacrylic ester.   
     
     
         3 . The terminally modified acrylic polymer according to  claim 1 ,
 wherein R 2  is an alkyl group having 1 to 8 carbon atoms.   
     
     
         4 . The terminally modified acrylic polymer according to  claim 1 ,
 wherein R 3  and R 4  each is hydrogen atom.   
     
     
         5 . The terminally modified acrylic polymer according to  claim 1 ,
 wherein the number average molecular weight is 2000 to 500000.   
     
     
         6 . An inorganic fine particle dispersed paste composition,
 which comprises the terminally modified acrylic polymer according to  claim 1 , an organic solvent, and an inorganic fine particle.   
     
     
         7 . The inorganic fine particle dispersed paste composition according to  claim 6 ,
 wherein a boiling point of the organic solvent is 100 to 290° C. at 1 atm.   
     
     
         8 . The inorganic fine particle dispersed paste composition according to  claim 6 ,
 wherein the inorganic fine particle is a glass frit, a phosphor powder, a silver powder, a copper powder, an ITO powder, a zinc oxide powder or a carbon powder.   
     
     
         9 . A method of producing a terminally modified acrylic polymer, comprising
 a step of reacting a living radical polymerization initiator represented by the formula (3-1) or (3-2) with an acrylic monomer represented by the formula (4) to prepare an acrylic polymer, and   a step of reacting said acrylic polymer with a nitroxyl radical represented by the formula (5) or (6) to modify both ends or one end of said acrylic polymer,   
       
         
           
           
               
               
           
         
         wherein R 5  to R 12  each represents hydrogen atom, an organic group having 1 or more carbon atoms or a derivative of an organic group having 1 or more carbon atoms, R 13  represents a derivative of a divalent organic group having 3 or more carbon atoms, and X represents Bi, Te, Sb or iodine, provided that X is not replaced with R 6  when X is iodine.