Ink composition, two-pack curing ink composition set, and recording method and recorded matter using these

Abstract

The present invention provides: an ink composition which contains at least a polymerizable compound, a photopolymerization initiator and a coloring material, and is free from an aqueous solvent, wherein the polymerizable compound comprises at least a urethane oligomer; a two-pack curing ink composition set comprising an ink composition containing a coloring material and a reaction liquid containing a photopolymerization initiator and capable of forming an image with an ink composition obtained by mixing the ink composition and the reaction liquid, wherein the ink composition after mixing contains at least a polymerizable compound, a photopolymerization initiator and a coloring material, and is free from an aqueous solvent, wherein the polymerizable compound comprises a urethane oligomer.

1 . An ink composition which contains at least a polymerizable compound, a photopolymerization initiator and a coloring material, and is free from an aqueous solvent, wherein the polymerizable compound comprises at least a urethane oligomer. 
     
     
         2 . The ink composition as claimed in  claim 1 , wherein the polymerizable compound is a radically polymerizable compound, and the photopolymerization initiator is a photoradical polymerization initiator. 
     
     
         3 . The ink composition as claimed in  claim 1 , wherein the content of the urethane oligomer in the ink composition is from 1 to 50% by weight. 
     
     
         4 . The ink composition as claimed in  claim 2 , wherein the radically polymerizable compound comprises an allyl compound and/or an N-vinyl compound. 
     
     
         5 . The ink composition as claimed in  claim 4 , wherein the content of the allyl compound and/or N-vinyl compound is from 20 to 80% by weight. 
     
     
         6 . The ink composition as claimed in  claim 4 , wherein the allyl compound is allyl glycol. 
     
     
         7 . The ink composition as claimed in  claim 4 , wherein the N-vinyl compound is N-vinyl formamide. 
     
     
         8 . A two-pack curing ink composition set comprising an ink composition containing a coloring material and a reaction liquid containing a photopolymerization initiator and capable of forming an image with an ink composition obtained by mixing the ink composition and the reaction liquid,
 wherein the ink composition after mixing contains at least a polymerizable compound, a photopolymerization initiator and a coloring material, and is free from an aqueous solvent, wherein the polymerizable compound comprises a urethane oligomer.   
     
     
         9 . The two-pack curing ink composition as claimed in  claim 8 , wherein the ink composition after mixing contains at least a polymerizable compound, a photopolymerization initiator and a coloring material, and is free from an aqueous solvent, wherein the polymerizable compound comprises at least a urethane oligomer. 
     
     
         10 . A recording method using the ink composition as claimed in  claim 1 , or a two-pack curing ink composition set comprising an ink composition containing a coloring material and a reaction liquid containing a photopolymerization initiator and capable of forming an image with an ink composition obtained by mixing the ink composition and the reaction liquid,
 wherein the ink composition after mixing contains at least a polymerizable compound a photopolymerization initiator and a coloring material, and is free from an aqueous solvent, wherein the polymerizable compound comprises a urethane oligomer.   
     
     
         11 . Recorded matter obtained using the ink composition as claimed in  claim 1 , or a two-pack curing ink composition set comprising an ink composition containing a coloring material and a reaction liquid containing a photopolymerization initiator and capable of forming an image with an ink composition obtained by mixing the ink composition and the reaction liquid,
 wherein the ink composition after mixing contains at least a polymerizable compound, a photopolymerization initiator and a coloring material, and is free from an aqueous solvent, wherein the polymerizable compound comprises a urethane oligomer.