Colored polypropylene resin composition and method of producing the composition

Abstract

Provided is a colored polypropylene resin composition, which is excellent in high color developability, washing resistance, and sublimation resistance, and can be stably supplied. The colored polypropylene resin composition includes a polypropylene resin and a colorant, and is characterized by including a compound having a predetermined structure as the colorant.

What is claimed is: 
     
         1 . A method of producing a colored polypropylene resin composition comprising coloring a polypropylene resin with a colorant in a medium,
 wherein the medium to be used is supercritical carbon dioxide, and   wherein the colorant contains at least compound represented by formulae (1) to (4):   
       
         
           
           
               
               
           
         
         wherein, in the formula (1): 
         R 1  and R 2  each independently represent an alkyl group having 1 to 12 carbon atoms; 
         R 3  represents an alkyl group having 1 to 4 carbon atoms, a phenyl group having a substituent, or an unsubstituted phenyl group; 
         R 4  represents an alkyl group having 1 to 4 carbon atoms, or an unsubstituted phenyl group; 
         R 5  represents an alkyl group having 1 to 12 carbon atoms, an unsubstituted phenyl group, a benzyl group, a dialkylamino group, or a diphenylamino group; and 
         A represents a carbon atom or a nitrogen atom, and when A represents a carbon atom, one hydrogen atom is bonded to the carbon atom; 
       
       
         
           
           
               
               
           
         
         wherein, in the formula (2): 
         R 6  and R 7  each independently represent a linear alkyl group having 1 to 12 carbon atoms, a branched alkyl group having 3 to 12 carbon atoms, or a cyclic alkyl group having 3 to 12 carbon atoms; 
         R 8  represents a linear alkyl group having 1 to 4 carbon atoms, a branched alkyl group having 1 to 4 carbon atoms, a phenyl group having a substituent, or an unsubstituted phenyl group; 
         R 9  represents a linear alkyl group having 1 to 12 carbon atoms, or a branched alkyl group having 1 to 12 carbon atoms; 
         R 10  represents a hydrogen atom, an alkyl group, an aryl group, a benzyl group, or —NR 11 R 12 ; and 
         R 11  and R 12  each independently represent a hydrogen atom, an unsubstituted alkyl group, an alkyl group having a substituent, an unsubstituted aryl group, an aryl group having a substituent, an unsubstituted acyl group, or an acyl group having a substituent, and R 11  and R 12  represent a ring formed by bonding thereof to each other; 
       
       
         
           
           
               
               
           
         
         wherein, in the formula (3): 
         B represents a carbonyl group or a sulfonyl group; 
         R 13  and R 14  each independently represent a linear alkyl group having 1 to 12 carbon atoms, a branched alkyl group having 3 to 12 carbon atoms, or a cyclic alkyl group having 3 to 12 carbon atoms; 
         R 15  represents a linear alkyl group having 1 to 12 carbon atoms, or a branched alkyl group having 1 to 12 carbon atoms; 
         R 16  represents a hydrogen atom, an alkyl group, an aryl group, a benzyl group, or —NR 17 R 18 ; and 
         R 17  and R 18  each independently represent a hydrogen atom, an unsubstituted alkyl group, an alkyl group having a substituent, an unsubstituted aryl group, an aryl group having a substituent, an unsubstituted acyl group, or an acyl group having a substituent, and R 17  and R 18  represent a ring formed by bonding thereof to each other; 
       
       
         
           
           
               
               
           
         
         wherein, in the formula (4): 
         R 19  and R 20  each independently represent a linear alkyl group having 1 to 12 carbon atoms, a branched alkyl group having 3 to 12 carbon atoms, or a cyclic alkyl group having 3 to 12 carbon atoms, and R 21  represents a linear alkyl group having 1 to 4 carbon atoms; 
         R 22  represents a linear alkyl group having 1 to 12 carbon atoms, or a branched alkyl group having 1 to 12 carbon atoms; and 
         R 23  and R 24  each independently represent a hydrogen atom, an unsubstituted alkyl group, an alkyl group having a substituent, an unsubstituted aryl group, an aryl group having a substituent, an unsubstituted acyl group, or an acyl group having a substituent, and R 23  and R 24  represent a ring formed by bonding thereof to each other. 
       
     
     
         2 . The method according to  claim 1 , wherein the supercritical carbon dioxide serving as the medium has added thereto one of a lower alcohol or a ketone.