Cellulose Acylate Film, Retardation Film, Polarizer and Liquid Crystal Display Device

Abstract

A cellulose acylate film comprising a cellulose acylate resin satisfying the formulae (i)-(iii) and a compound capable of forming a hydrogen bond satisfying conditions (A)-(C): (A) the compound has both a hydrogen bond donor moiety and a hydrogen bond acceptor moiety in the molecule, (B) the value obtained by dividing the molecular weight of the compound by the total of the number of the hydrogen bond donor moiety and the number of the hydrogen bond acceptor moiety is from 30 to 65, (C) the number of aromatic ring structures is from 1 to 3, 0.5≦ A+B ≦2.7,  (i) 0.0≦ A ≦2.5, and  (ii) 0.1≦ B ≦2.0,  (iii) wherein A means the degree of substitution with an acetyl group, and B means a total of the degree of substitution with a propionyl group and the degree of substitution with a butyryl group.

What is claimed is: 
     
         1 . A cellulose acylate film comprising a cellulose acylate resin having a degree of acyl substitution satisfying all the following formulae (i), (ii) and (iii) and a compound capable of forming a hydrogen bond satisfying all the following conditions (A), (B) and (C):
 (A) the compound has both a hydrogen bond donor moiety and a hydrogen bond acceptor moiety in the molecule,   (B) the value obtained by dividing the molecular weight of the compound by the total of the number of the hydrogen bond donor moiety and the number of the hydrogen bond acceptor moiety is from 30 to 65,   (C) the number of aromatic ring structures is from 1 to 3,
   0.5 ≦A+B≦ 2.7,  (i)
 
   0.0 ≦A≦ 2.5, and  (ii)
 
   0.1 ≦B≦ 2.0,  (iii)
 
   
       where, in the formulae (i), (ii) and (iii), A means the degree of substitution with an acetyl group, and B means a total of the degree of substitution with a propionyl group and the degree of substitution with a butyryl group, wherein the compound capable of forming a hydrogen bond is represented by the following formula (H-1): 
       
         
           
           
               
               
           
         
       
       wherein L 3  represents a single bond or a divalent linking group having a hetero atom; and R 85  represents an alkyl group having from 1 to 20 carbon atoms, an alkenyl group having from 2 to 20 carbon atoms, an alkynyl group having from 2 to 20 carbon atoms, an aryl group having from 6 to 20 carbon atoms or an arylalkyl group having from 7 to 20 carbon atoms; R 83  and R 84  each independently represent a hydrogen atom, an alkyl group, an alkenyl group, an alkynyl group, a heterocyclic group or an aryl group; and X 53  and X 54  each independently represent any one selected from the group of divalent linking groups of the following formula (P): 
       
         
           
           
               
               
           
         
       
       wherein the side * is the linking site to the N atom that bonds to the heterocyclic ring in the compound of the formula (H-1). 
     
     
         2 . The cellulose acylate film according to  claim 1 , wherein the degree of substitution with an acyl group of the cellulose acylate satisfies all the following formulae (iv), (v) and (vi):
   1.0 ≦A+B≦ 2.5,  (iv)
     0.1 ≦A≦ 2.0, and  (v)
     0.1 ≦B≦ 1.8,  (vi)
   
       where, in the formulae (iv), (v) and (vi), A means the degree of substitution with an acetyl group, and B means a total of the degree of substitution with a propionyl group and the degree of substitution with a butyryl group. 
     
     
         3 . The cellulose acylate film according to  claim 1 , wherein the degree of substitution with an acyl group of the cellulose acylate satisfies all the following formulae (vii), (viii) and (ix):
   1.2 ≦A+B≦ 2.5,  (vii)
     0.1 ≦A≦ 1.9, and  (viii)
     0.5 ≦B≦ 1.8,  (ix)
   
       where, in the formulae (vii), (viii) and (ix), A means the degree of substitution with an acetyl group, and B means a total of the degree of substitution with a propionyl group and the degree of substitution with a butyryl group. 
     
     
         4 . The cellulose acylate film according to  claim 1 , wherein the cellulose acylate resin has a mass-average degree of polymerization of from 350 to 800. 
     
     
         5 . The cellulose acylate film according to  claim 1 , wherein the hydrogen bond donor moiety is connected to the hydrogen bond acceptor moiety through from 0 to 3 atoms. 
     
     
         6 . The cellulose acylate film according to  claim 1 , wherein the compound capable of forming a hydrogen bond has a molecular weight of from 100 to 1000. 
     
     
         7 . The cellulose acylate film according to  claim 1 , wherein the content of the compound capable of forming a hydrogen bond is 30% by mass or less relative to the content of the cellulose acylate resin. 
     
     
         8 . A retardation film comprising a cellulose acylate film, wherein the cellulose acylate film comprises a cellulose acylate resin having a degree of acyl substitution satisfying all the following formulae (i), (ii) and (iii) and a compound capable of forming a hydrogen bond satisfying all the following conditions (A), (B) and (C):
 (A) the compound has both a hydrogen bond donor moiety and a hydrogen bond acceptor moiety in the molecule,   (B) the value obtained by dividing the molecular weight of the compound by the total of the number of the hydrogen bond donor moiety and the number of the hydrogen bond acceptor moiety is from 30 to 65,   (C) the number of aromatic ring structures is from 1 to 3,
   0.5 ≦A+B≦ 2.7,  (i)
 
   0.0 ≦A≦ 2.5, and  (ii)
 
   0.1 ≦B≦ 2.0,  (iii)
 
   
       where, in the formulae (i), (ii) and (iii), A means the degree of substitution with an acetyl group, and B means a total of the degree of substitution with a propionyl group and the degree of substitution with a butyryl group, wherein the compound capable of forming a hydrogen bond is represented by the following formula (H-1): 
       
         
           
           
               
               
           
         
       
       wherein L 3  represents a single bond or a divalent linking group having a hetero atom; and R 85  represents an alkyl group having from 1 to 20 carbon atoms, an alkenyl group having from 2 to 20 carbon atoms, an alkynyl group having from 2 to 20 carbon atoms, an aryl group having from 6 to 20 carbon atoms or an arylalkyl group having from 7 to 20 carbon atoms; R 83  and R 84  each independently represent a hydrogen atom, an alkyl group, an alkenyl group, an alkynyl group, a heterocyclic group or an aryl group; and X 53  and X 54  each independently represent any one selected from the group of divalent linking groups of the following formula (P): 
       
         
           
           
               
               
           
         
       
       wherein the side * is the linking site to the N atom that bonds to the heterocyclic ring in the compound of the formula (H-1). 
     
     
         9 . A polarizer comprising a cellulose acylate film, wherein the cellulose acylate film comprises a cellulose acylate resin having a degree of acyl substitution satisfying all the following formulae (i), (ii) and (iii) and a compound capable of forming a hydrogen bond satisfying all the following conditions (A), (B) and (C):
 (A) the compound has both a hydrogen bond donor moiety and a hydrogen bond acceptor moiety in the molecule,   (B) the value obtained by dividing the molecular weight of the compound by the total of the number of the hydrogen bond donor moiety and the number of the hydrogen bond acceptor moiety is from 30 to 65,   (C) the number of aromatic ring structures is from 1 to 3,
   0.5 ≦A+B≦ 2.7,  (i)
 
   0.0 ≦A≦ 2.5, and  (ii)
 
   0.1 ≦B≦ 2.0,  (iii)
 
   
       where, in the formulae (i), (ii) and (iii), A means the degree of substitution with an acetyl group, and B means a total of the degree of substitution with a propionyl group and the degree of substitution with a butyryl group, wherein the compound capable of forming a hydrogen bond is represented by the following formula (H-1): 
       
         
           
           
               
               
           
         
       
       wherein L 3  represents a single bond or a divalent linking group having a hetero atom; and R 85  represents an alkyl group having from 1 to 20 carbon atoms, an alkenyl group having from 2 to 20 carbon atoms, an alkynyl group having from 2 to 20 carbon atoms, an aryl group having from 6 to 20 carbon atoms or an arylalkyl group having from 7 to 20 carbon atoms; R 83  and R 84  each independently represent a hydrogen atom, an alkyl group, an alkenyl group, an alkynyl group, a heterocyclic group or an aryl group; and X 53  and X 54  each independently represent any one selected from the group of divalent linking groups of the following formula (P): 
       
         
           
           
               
               
           
         
       
       wherein the side * is the linking site to the N atom that bonds to the heterocyclic ring in the compound of the formula (H-1). 
     
     
         10 . A liquid crystal display device comprising a cellulose acylate film, wherein the cellulose acylate film comprises a cellulose acylate resin having a degree of acyl substitution satisfying all the following formulae (i), (ii) and (iii) and a compound capable of forming a hydrogen bond satisfying all the following conditions (A), (B) and (C):
 (A) the compound has both a hydrogen bond donor moiety and a hydrogen bond acceptor moiety in the molecule,   (B) the value obtained by dividing the molecular weight of the compound by the total of the number of the hydrogen bond donor moiety and the number of the hydrogen bond acceptor moiety is from 30 to 65,   (C) the number of aromatic ring structures is from 1 to 3,
   0.5 ≦A+B≦ 2.7,  (i)
 
   0.0 ≦A≦ 2.5, and  (ii)
 
   0.1 ≦B≦ 2.0,  (iii)
 
   
       where, in the formulae (i), (ii) and (iii), A means the degree of substitution with an acetyl group, and B means a total of the degree of substitution with a propionyl group and the degree of substitution with a butyryl group, wherein the compound capable of forming a hydrogen bond is represented by the following formula (H-1): 
       
         
           
           
               
               
           
         
       
       wherein L 3  represents a single bond or a divalent linking group having a hetero atom; and R 85  represents an alkyl group having from 1 to 20 carbon atoms, an alkenyl group having from 2 to 20 carbon atoms, an alkynyl group having from 2 to 20 carbon atoms, an aryl group having from 6 to 20 carbon atoms or an arylalkyl group having from 7 to 20 carbon atoms; R 83  and R 84  each independently represent a hydrogen atom, an alkyl group, an alkenyl group, an alkynyl group, a heterocyclic group or an aryl group; and X 53  and X 54  each independently represent any one selected from the group of divalent linking groups of the following formula (P): 
       
         
           
           
               
               
           
         
       
       wherein the side * is the linking site to the N atom that bonds to the heterocyclic ring in the compound of the formula (H-1).