Ink, ink for ink-jet recording, printed matter, and method for producing printed matter

Abstract

A task to be achieved by the present invention is to provide an ink having excellent adhesion to an ink unabsorbent or non-absorbent recording medium, such as a resin film or coated paper, which is unlikely to absorb a solvent contained in an ink, and excellent setting property. The present invention is directed to an ink including a binder (A) having a carbonyl group, a compound (B) having a structure capable of reacting with the carbonyl group, and an aqueous medium in which the binder (A) and the compound (B) are dissolved or dispersed.

1 . An ink comprising: a binder (A) having a carbonyl group; a compound (B) having a structure capable of reacting with the carbonyl group; and an aqueous medium (C) in which the binder (A) and the compound (B) are dissolved or dispersed. 
     
     
         2 . The ink according to  claim 1 , wherein the binder (A) is a core-shell polymer, wherein the core-shell polymer has a core portion having a carbonyl group. 
     
     
         3 . The ink according to  claim 1 , wherein the core-shell polymer has a core portion comprising an acrylic polymer of a vinyl monomer component containing diacetone acrylamide, and a shell portion comprising an arbitrary acrylic polymer. 
     
     
         4 . The ink according to  claim 1 , wherein the compound (B) is a compound having a hydrazine structure. 
     
     
         5 . The ink according to  claim 4 , wherein the compound (B) is adipic dihydrazide. 
     
     
         6 . The ink according to  claim 1 , wherein the aqueous medium (C) contains a solvent (C1) having a Hansen solubility parameter in which the polar term is 7 or more and the hydrogen bond term is 15 or more. 
     
     
         7 . The ink according to  claim 6 , wherein the solvent (C1) contains 1,2-propanediol, 1,2-hexanediol, 1,4-butanediol, 1,3-butanediol, 1,2-butanediol, 3-methyl-1,5-pentanediol, 2-methyl-1,3-propanediol, 3-methyl-1,3-butanediol, or 3-methyl-1,4-butanediol. 
     
     
         8 . The ink according to  claim 6 , wherein the solvent (C1) contains 1,2-propanediol and at least one member selected from the group consisting of 1,2-hexanediol, 1,4-butanediol, 1,3-butanediol, 1,2-butanediol, 3-methyl-1,5-pentanediol, 2-methyl-1,3-propanediol, 3-methyl-1,3-butanediol, and 3-methyl-1,4-butanediol. 
     
     
         9 . The ink according to  claim 6 , wherein the mass proportion of the binder (A) to the whole of the ink is in the range of 3 to 10% by mass, the mass proportion of the compound (B) to the binder (A) is in the range of 0.1 to 5% by mass, and the mass proportion of the solvent (C1) to the whole of the ink is in the range of 15 to 40% by mass. 
     
     
         10 . The ink according to  claim 1 , which is for use in ink-jet printing. 
     
     
         11 . A printed matter which is obtained by bringing the ink according to  claim 1  in contact with the surface of a recording medium, and then causing the carbonyl group of the binder (A) and the hydrazine structure of the compound (B) contained in the ink to be reacted with each other, forming a structure represented by the following chemical formula (1): 
       
         
           
           
               
               
           
         
       
     
     
         12 . A method for producing a printed matter, comprising bringing the ink according to  claim 1  in contact with the surface of a recording medium, and then drying the ink while maintaining the surface temperature of the recording medium in the range of 5 to 60° C. to cause the carbonyl group of the binder (A) and the hydrazine structure of the compound (B) contained in the ink to be reacted with each other, forming a structure represented by the following chemical formula (1): 
       
         
           
           
               
               
           
         
       
     
     
         13 . A method for producing a printed matter, comprising bringing the ink for ink-jet printing according to  claim 10  in contact with the surface of a recording medium by an ink-jet recording method in which the gap between a plane (x) having an ink outlet of an ink-jet head and a position (y) of an intersection of the perpendicular line to the plane (x) and the recording medium is set at 1 mm or more, and then drying the ink while maintaining the surface temperature of the recording medium in the range of 5 to 60° C. to cause the carbonyl group of the binder (A) and the hydrazine structure of the compound (B) contained in the ink to be reacted with each other, forming a structure represented by the following chemical formula (1):