Rewritable recording material

Abstract

A rewritable recording material can be provided which contains at least one kind of phenolic compounds represented by formula (I) and which is capable of stably repeating coloring and discoloring for a long period of time as well as exerting superior storage properties such as heat resistance and moisture and heat resistance of the colored image and light resistance of the background. Also provided are a composition for forming a rewritable color-forming layer which is capable of forming a color-forming layer of the recording material, and a composition of a color-developing agent for a rewritable recording material.

1 . A rewritable recording material comprising a color-forming layer on a substrate, wherein the color-forming layer contains a color-forming compound and at least one kind of phenolic compounds represented by formula (I) 
       
         
           
           
               
               
           
         
         [wherein R 1  and R 4  each independently represent a hydrogen atom, hydroxy group, nitro group, halogen atom, C 1 -C 6  alkyl group or C 1 -C 6  alkoxy group; p represents 0 or an integer of 1 to 4; q represents 0 or an integer of 1 to 5; when p or q is 2 or more, R 1 s and R 4 s may be the same or different; R 2  and R 3  each independently represent a hydrogen atom or C 1 -C 6  alkyl group; and R 5  represents a hydrogen atom, C 1 -C 6  alkyl group, optionally substituted phenyl group, or optionally substituted benzyl group]. 
       
     
     
         2 . The rewritable recording material according to  claim 1 , wherein the substrate is a paper, synthetic resin film or synthetic resin sheet. 
     
     
         3 . A composition for forming a rewritable color-forming layer, wherein the composition contains at least one kind of phenolic compounds represented by formula (I) 
       
         
           
           
               
               
           
         
         [wherein R 1  and R 4  each independently represent a hydrogen atom, hydroxy group, nitro group, halogen atom, C 1 -C 6  alkyl group or C 1 -C 6  alkoxy group; p represents 0 or an integer of 1 to 4; q represents 0 or an integer of 1 to 5; when p or q is 2 or more, R 1 s and R 4 s may be the same or different; R 2  and R 3  each independently represent a hydrogen atom or C 1 -C 6  alkyl group; and R 5  represents a hydrogen atom, C 1 -C 6  alkyl group, optionally substituted phenyl group, or optionally substituted benzyl group]. 
       
     
     
         4 . The composition for forming a rewritable color-forming layer according to  claim 3 , wherein the composition contains a color-forming compound and at least one kind of phenolic compounds represented by formula (I). 
     
     
         5 . A composition of a color-developing agent for a rewritable recording material, wherein the composition comprises at least one kind of phenolic compounds represented by formula (I) 
       
         
           
           
               
               
           
         
         [wherein R 1  and R 4  each independently represent a hydrogen atom, hydroxy group, nitro group, halogen atom, C 1 -C 6  alkyl group or C 1 -C 6  alkoxy group; p represents 0 or an integer of 1 to 4; q represents 0 or an integer of 1 to 5; when p or q is 2 or more, R 1 s and R 4 s may be the same or different; R 2  and R 3  each independently represent a hydrogen atom or C 1 -C 6  alkyl group; and R 5  represents a hydrogen atom, C 1 -C 6  alkyl group, optionally substituted phenyl group, or optionally substituted benzyl group].