Silicon oligomer and production method therefor

Abstract

An object of the present invention is to provide a silicon oligomer having a novel function that has not been achieved by a conventional condensation product of water and a tetraalkoxysilane. Provided are a silicon oligomer represented by the following formula (I) and a production method therefor: wherein R 1 to R 10 each independently is an alkyl group or a hydroxyalkyl group, each having 1 to 4 carbon atoms; X 1 to X 3 each independently is a group represented by the following formula (II); n is 0 or 1; and m is an integer of 1 to 3 when n is 0, and m is 1 when n is 1: wherein A is an alkylene group having 2 to 4 carbon atoms which may be branched, and l is an integer of 1 to 3.

1 . A silicon oligomer of formula (I): 
       
         
           
           
               
               
           
         
         wherein R 1  to R 10  are each independently an alkyl group or a hydroxyalkyl group, each having 1 to 4 carbon atoms; X 1  to X 3  are each independently a group of formula (II); n is 0 or 1; and m is an integer of 1 to 3 when n is 0, and m is 1 when n is 1: 
       
       
         
           
           
               
               
           
         
         wherein A is an alkylene group having 2 to 4 carbon atoms, which may be branched, and l is an integer of 1 to 3. 
       
     
     
         2 . The silicon oligomer according to  claim 1 ,
 wherein, in the formula (I), R 1  to R 10  are each independently an alkyl group or a hydroxyalkyl group, each having 2 carbon atoms; X 1  to X 3  are each independently a group of formula (II); n is 0 or 1; and m is an integer of 1 to 3 when n is 0, and m is 1 when n is 1, and   in the formula (II), A is an alkylene group having 2 carbon atoms; and l is 1.   
     
     
         3 . A polymerizable product, is obtained by heating the silicon oligomer according to  claim 1 . 
     
     
         4 . A method for producing the silicon oligomer according to  claim 1 , comprising reacting a tetraalkoxysilane of formula (III) and a dihydric alcohol of formula (IV) with each other in the presence of a metal catalyst, an acid, or an alkali: 
       
         
           
           
               
               
           
         
         wherein R 11  to R 14  are each independently an alkyl group or a hydroxyalkyl group, each having 1 to 4 carbon atoms; and 
       
       
         
           
           
               
               
           
         
         wherein B is an alkylene group having 2 to 4 carbon atoms, which may be branched, and k is an integer of 1 to 3. 
       
     
     
         5 . The method according to  claim 4 , wherein the metal catalyst comprises at least one member selected from the group consisting of aluminum, cobalt, titanium, zinc, molybdenum, and tin. 
     
     
         6 . The method according to  claim 4 , wherein the dihydric alcohol of formula (IV) is at least one member selected from the group consisting of ethylene glycol, propylene glycol, and butylene glycol. 
     
     
         7 . The method according to  claim 4 , wherein a molar ratio of the tetraalkoxysilane of formula (III) and the dihydric alcohol of formula (IV) is from 4:1 to 1:4. 
     
     
         8 . The method according to  claim 4 , wherein an alcohol formed during the reaction is not subjected to fractional distillation.