Retardation-increasing agent, cellulose-based resin composition using same, and film

Abstract

Provided are: a retardation-increasing agent that has excellent compatibility and, when incorporated into a resin film, is capable of not only adjusting the thickness-direction phase difference toward a positive direction but also imparting the film with high retardation; a cellulose-based resin composition comprising the retardation-increasing agent; and a film that is obtained from the cellulose-based resin composition and has excellent optical properties. The retardation-increasing agent comprises a compound represented by the following Formula (1) or (2): (wherein, R 1 to R 10 each independently represent a hydrogen atom or the like); or (wherein, R 21 to R 28 each independently represent a hydrogen atom or the like).

1 . A retardation-increasing agent comprising a compound represented by the following Formula (1) or (2): 
       
         
           
           
               
               
           
         
         [wherein, R 1  to R 10  each independently represent a hydrogen atom; a halogen atom; a hydroxy group; a cyano group; a nitro group; an amino group; a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms; a substituted or unsubstituted alkenyl group having 2 to 12 carbon atoms; a substituted or unsubstituted cycloalkyl group having 3 to 12 carbon atoms; a group represented by R A (C═O)OR B — (wherein R A  represents an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 12 carbon atoms or a cycloalkyl group having 3 to 12 carbon atoms, and R B  represents a single bond or an alkylene group having 1 to 10 carbon atoms, which alkyl group, alkenyl group and alkylene group are optionally interrupted by an oxygen atom); or R A O(C═O)R B — (wherein, R A  and R B  each represent the same group as described above), which alkyl group, alkenyl group and cycloalkyl group are optionally interrupted by one or plural oxygen atoms, carbonyl groups, carboxy groups or amino groups]; or 
       
       
         
           
           
               
               
           
         
         [wherein, R 21  to R 28  each independently represent a hydrogen atom; a halogen atom; a hydroxy group; a cyano group; a nitro group; an amino group; a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms; a substituted or unsubstituted cycloalkyl group having 3 to 12 carbon atoms; a substituted or unsubstituted alkenyl group having 2 to 12 carbon atoms; a group represented by R A (C═O)OR B — (wherein R A  represents an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 12 carbon atoms or a cycloalkyl group having 3 to 12 carbon atoms, and R B  represents a single bond or an alkylene group having 1 to 10 carbon atoms, which alkyl group, alkenyl group and alkylene group are optionally interrupted by an oxygen atom); or R A O(C═O)R B — (wherein, R A  and R B  each represent the same group as described above), which alkyl group, alkenyl group and cycloalkyl group are optionally interrupted by one or plural oxygen atoms, carbonyl groups, carboxy groups or amino groups]. 
       
     
     
         2 . The retardation-increasing agent according to  claim 1 , wherein said R 1 , R 2 , R 4 , R 5 , R 6 , R 7 , R 9  and R 10  in said Formula (1) are hydrogen atoms. 
     
     
         3 . The retardation-increasing agent according to  claim 1 , wherein at least one of said R 3  and R 8  in said Formula (1) is a hydroxy group; a cyano group; an alkyl group having 1 to 10 carbon atoms; an alkyl group having 1 to 10 carbon atoms that is interrupted by one or plural oxygen atoms or carbonyl groups; an alkenyl group having 2 to 12 carbon atoms; an alkenyl group having 2 to 12 carbon atoms that is interrupted by one or plural oxygen atoms or carbonyl groups; or a cycloalkyl group having 3 to 12 carbon atoms. 
     
     
         4 . The retardation-increasing agent according to  claim 1 , wherein said compound represented by said Formula (1) is a compound represented by the following Formula (3): 
       
         
           
           
               
               
           
         
         (wherein, R 31  represents a substituted or unsubstituted alkylene group having 1 to 10 carbon atoms or a substituted or unsubstituted cycloalkylene group having 4 to 10 carbon atoms; R 32  represents a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms or a substituted or unsubstituted cycloalkyl group having 4 to 10 carbon atoms, which alkyl group is optionally interrupted by one or plural oxygen atoms or carbonyl groups). 
       
     
     
         5 . The retardation-increasing agent according to  claim 1 , wherein said R 21 , R 23 , R 24 , R 25 , R 27  and R 28  in said Formula (2) are hydrogen atoms. 
     
     
         6 . The retardation-increasing agent according to  claim 4 , wherein at least one of said R 22  and R 26  in said Formula (2) is a hydroxy group; a cyano group; an alkyl group having 1 to 10 carbon atoms; an alkyl group having 1 to 10 carbon atoms that is interrupted by one or plural oxygen atoms or carbonyl groups; an alkenyl group having 2 to 12 carbon atoms; an alkenyl group having 2 to 12 carbon atoms that is interrupted by one or plural oxygen atoms or carbonyl groups; or a cycloalkyl group having 3 to 12 carbon atoms. 
     
     
         7 . The retardation-increasing agent according to  claim 1 , which is used for a cellulose-based resin film. 
     
     
         8 . A cellulose-based resin composition comprising the retardation-increasing agent according to  claim 1  in an amount of 0.1 to 30 parts by mass with respect to 100 parts by mass of a cellulose-based resin. 
     
     
         9 . The cellulose-based resin composition according to  claim 8 , further comprising a plasticizer in an amount of 1 to 30 parts by mass with respect to 100 parts by mass of said cellulose-based resin. 
     
     
         10 . The cellulose-based resin composition according to  claim 8 , wherein said cellulose-based resin is cellulose acylate. 
     
     
         11 . A film obtained by molding the cellulose-based resin composition according to  claim 8 .