Modified lignin, modified polyphenol manufacturing method, and modified lignin-including resin composition material

Abstract

A modified lignin having a ratio ((2H+G)/S) of a total of twice of a relative existence ratio H (%) of an H-type skeleton and a relative existence ratio G (%) of a G-type skeleton with respect to a relative existence ratio S (%) of an S-type skeleton, obtained from integrated values measured by 31P-NMR, of 2.5 or more, and an existence ratio of an aliphatic hydroxy group obtained by the same method of less than 20%, a method for producing a modified polyphenol, and a modified lignin-containing resin composition material.

1 . A method for producing a modified polyphenol, comprising reacting a polyphenol-containing composition with a phenol compound having a hydrogen atom at least one of the 2-position, the 4-position, and the 6-position as the positions of substituents with respect to the hydroxy group. 
     
     
         2 . The method for producing a modified polyphenol according to  claim 1 , wherein the phenol compound is a compound represented by the following formula (1): 
       
         
           
           
               
               
           
         
         wherein R 1  and R 2  each independently represent a hydrogen atom, a hydroxy group, or an alkyl group having 1 to 15 carbon atoms, and R 1  and R 2  may be the same as or different from each other. 
       
     
     
         3 . The method for producing a modified polyphenol according to  claim 1 , wherein the reaction is performed without catalyst or in the presence of an acid catalyst in an amount of more than 0 to 3.0% by mass based on the total amount of a raw material polyphenol in the polyphenol-containing composition and the phenol compound. 
     
     
         4 . The method for producing a modified polyphenol according to  claim 1 , wherein the reaction is performed without catalyst or in the presence of an acid catalyst in an amount of 0.2 to 3.0% by mass based on the total amount of a raw material polyphenol in the polyphenol-containing composition and the phenol compound. 
     
     
         5 . The method for producing a modified polyphenol according to  claim 1 , wherein the reaction is performed without catalyst. 
     
     
         6 . The method for producing a modified polyphenol according to  claim 1 , wherein a mass ratio of the phenol compound with respect to a raw material polyphenol in the polyphenol-containing composition (phenol compound/raw material polyphenol) is 1 to 15. 
     
     
         7 . The method for producing a modified polyphenol according to  claim 1 , wherein the reaction is performed at a reaction temperature of more than 140° C. and 350° C. or less. 
     
     
         8 . The method for producing a modified polyphenol according to  claim 1 , wherein the reaction is performed at a reaction temperature of more than 140° C. and 250° C. or less. 
     
     
         9 . The method for producing a modified polyphenol according to  claim 1 , wherein the modified polyphenol has a number average molecular weight and a weight average molecular weight that become smaller than a raw material polyphenol in the polyphenol-containing composition. 
     
     
         10 . The method for producing a modified polyphenol according to  claim 1 , wherein the polyphenol-containing composition is a lignin-containing composition, and the modified polyphenol is a modified lignin. 
     
     
         11 . The method for producing a modified polyphenol according to  claim 1 , wherein the polyphenol-containing composition is lignin, and the modified polyphenol is a modified lignin. 
     
     
         12 . The method for producing a modified polyphenol according to  claim 10 , wherein a total of reactive sites (2H+G) based on a relative existence ratio H (%) of an H-type skeleton and a relative existence ratio G (%) of a G-type skeleton obtained from integrated values measured by  31 P-NMR is increased by 4% or more before and after modification.