Ink composition, ink jet recording method, method for producing planographic printing plate and planographic printing plate

Abstract

The invention provides an ink composition including (A) a polymerization initiator and (B) a (meth)acrylic acid ester having an alicyclic group as a substituent or amide having an alicyclic group as a substituent. The ink composition preferably further contains (D) a colorant and (E) a sensitizing dye. The ink composition is used for ink jet recording.

What is claimed is: 
     
         1 . An ink composition comprising:
 (A) a polymerization initiator;   (B) a (meth)acrylic acid ester or amide having an alicyclic group as a substituent and, represented by the following formula (I) or (II):   
       
         
           
           
               
               
           
         
         wherein R 1  represents a hydrogen atom or a methyl group; R 2  to R 12  each independently represents a hydrogen atom or an alkyl group, with the proviso that at least two of R 2  to R 12  respectively represent an alkyl group; Z represents an oxygen atom or —NR 13 —; R 13  represents a hydrogen atom or an alkyl group; and X represents a single bond or a divalent organic group; and 
         (C) another polymerizable compound, and 
         a colorant,  
         wherein the ink composition has a viscosity of from 7 to 30 mPa·s within an ejecting temperature range of from 25 to 50 ° C., and 
         the content of the (B) (meth)acrylic acid ester or amide relative to the total content of the (B) (meth)acrylic acid ester or amide and the (C) other polymerizable compound is 15% by mass or higher.  
       
     
     
         2 . The ink composition of  claim 1  further comprising a colorant. 
     
     
         3 . The ink composition of  claim 2  further comprising a sensitizing dye. 
     
     
         4 . An ink jet recording ink of the composition according to  claim 3 . 
     
     
         5 . An ink jet recording method comprising:
 ejecting the ink composition of  claim 3  onto an recording medium; and   curing the ejected ink composition by irradiating actinic radiation to the ink composition.   
     
     
         6 . A method of producing a planographic printing plate, the method comprising:
 ejecting the ink composition of  claim 3  onto a hydrophilic support; and   curing the ejected ink composition by irradiating activation radiation to the ink composition and thereby forming a hydrophobic image of the cured ink composition on the hydrophilic support.   
     
     
         7 . A planographic printing plate produced by the method of producing a planographic printing plate according to  claim 6 . 
     
     
         8 . An ink jet recording ink of the composition according to  claim 2 . 
     
     
         9 . An ink jet recording method comprising:
 ejecting the ink composition of  claim 2  onto a recording medium; and   curing the ejected ink composition by irradiating actinic radiation to the ink composition.   
     
     
         10 . A method of producing a planographic printing plate, the method comprising:
 ejecting the ink composition of  claim 2  onto a hydrophilic support; and   curing the ejected ink composition by irradiating actinic radiation to the ink composition and thereby forming a hydrophobic image of the cured ink composition on the hydrophilic support.   
     
     
         11 . A planographic printing plate produced by the method of producing a planographic printing plate according to  claim 10 . 
     
     
         12 . The ink composition of  claim 1  further comprising a sensitizing dye. 
     
     
         13 . An ink jet recording ink of the composition according to  claim 12 . 
     
     
         14 . An ink jet recording method comprising:
 ejecting the ink composition of  claim 12  onto an recording medium; and   curing the ejected ink composition by irradiating actinic radiation to the ink composition.   
     
     
         15 . A method of producing a planographic printing plate, the method comprising:
 ejecting the ink composition of  claim 12  onto a hydrophilic support; and   curing the ejected ink composition by irradiating actinic radiation to the ink composition and thereby forming a hydrophobic image of the cured ink composition on the hydrophilic support.   
     
     
         16 . A planographic printing plate produced by the method of producing a planographic printing plate according to  claim 15 . 
     
     
         17 . A method of producing a planographic printing plate, the method comprising:
 ejecting the ink composition of  claim 1  onto a hydrophilic support; and   curing the ejected ink composition by irradiating with actinic radiation to the ink composition and thereby forming a hydrophobic image of the cured ink composition on the hydrophilic support.   
     
     
         18 . An ink jet recording ink of the composition according to  claim 1 . 
     
     
         19 . An ink jet recording method comprising:
 ejecting the ink composition of  claim 1  onto a recording medium; and   curing the ejected ink composition by irradiating actinic radiation to the ink composition.   
     
     
         20 . A planographic printing plate produced by the method of producing a planographic printing plate according to  claim 17 . 
     
     
         21 . The ink composition of  claim 1 , wherein the alkyl group represented by any one of R 2  to R 12  is selected from the group consisting of a methyl group, an ethyl group, an isopropyl group, and a tert-butyl group. 
     
     
         22 . The ink composition of  claim 1 , wherein the alkyl group represented by any one of R 2  to R 12  is a methyl group. 
     
     
         23 . The ink composition of  claim 1 , wherein the total content of the (meth)acrylic acid ester or amide (B) represented by Formula (I) or (II) and the another polymerizable compound (C) is in a range from 45% by mass to 95% by mass with respect to the total mass of the ink composition. 
     
     
         24 . The ink composition of  claim 1 , wherein the content of the (meth)acrylic acid ester or amide (B) represented by Formula (I) or (II) is in a range from 3 to 35% by mass with respect to the total mass of the ink composition. 
     
     
         25 . The ink composition of  claim 1 , wherein the surface tension of the ink composition is from 20 to 30 mN/m. 
     
     
         26 . The ink composition of  claim 1 , wherein the polymerization initiator (A) comprises an acylphosphine oxide compound. 
     
     
         27 . The ink composition of  claim 1 , further comprising a pigment as a colorantwherein the colorant is a pigment. 
     
     
         28 . The ink composition of  claim 1 , wherein the (meth)acrylic acid ester or amide (B) represented by Formula (I) or (II) is selected from the group consisting of compounds B-3, B-6, B-11 and B-13: 
       
         
           
           
               
               
           
         
       
     
     
       29. An ink composition comprising:
 (A) a polymerization initiator;   (B) an acrylic acid ester which is the compound B-11,   
       
         
           
           
               
               
           
         
         (C) another polymerizable compound, and 
         a colorant, 
         wherein the ink composition has a viscosity of from 7 to 30 mPa·s within an ejecting temperature range of from 25 to 50° C., and 
         the content of the (B) acrylic acid ester relative to the total content of the (B) acrylic acid ester and the (C) other polymerizable compound is 15% by mass or higher.  
       
     
     
       30. The ink composition of  claim 29  further comprising a sensitizing dye.  
     
     
       31. An ink jet recording ink of the composition according to  claim 30 .  
     
     
       32. An ink jet recording method comprising:
 ejecting the ink composition of claim 30 onto an recording medium; and   curing the ejected ink composition by irradiating actinic radiation to the ink composition.    
     
     
       33. A method of producing a planographic printing plate, the method comprising:
 ejecting the ink composition of claim 30 onto a hydrophilic support; and   curing the ejected ink composition by irradiating activation radiation to the ink composition and thereby forming a hydrophobic image of the cured ink composition on the hydrophilic support.    
     
     
       34. A planographic printing plate produced by the method of producing a planographic printing plate according to  claim 33 .  
     
     
       35. An inkjet recording ink of the composition according to  claim 29 .  
     
     
       36. An ink jet recording method comprising:
 ejecting the ink composition of claim 29 onto a recording medium; and   curing the ejected ink composition by irradiating actinic radiation to the ink composition.    
     
     
       37. A method of producing a planographic printing plate, the method comprising:
 ejecting the ink composition of claim 29 onto a hydrophilic support; and   curing the ejected ink composition by irradiating actinic radiation to the ink composition and thereby forming a hydrophobic image of the cured ink composition on the hydrophilic support.    
     
     
       38. A planographic printing plate produced by the method of producing a planographic printing plate according to  claim 37 .