Ink composition for inkjet recording

Abstract

In accordance with one embodiment, an ink composition for inkjet recording comprises a pigment, a pigment dispersant, water, a water-soluble solvent, a wettability enhancer including 2,5,8,11-tetramethyl-6-dodecyne-5,8-diol, and an aqueous resin emulsion.

What is claimed is: 
     
         1 . An ink composition for inkjet recording, comprising:
 a pigment;   a pigment dispersant;   water;   a water-soluble solvent;   a wettability enhancer including 2,5,8,11-tetramethyl-6-dodecyne-5,8-diol; and   an aqueous resin emulsion
 wherein an amount of the wettability enhancer is 0.1-5% and an amount of the aqueous resin emulsion is 1-30% of the total weight of the ink. 
   
     
     
         2 . The ink composition for inkjet recording according to  claim 1 , wherein
 the aqueous resin emulsion is an acrylic resin emulsion.   
     
     
         3 . The ink composition for inkjet recording according to  claim 1 , wherein
 the acrylic resin emulsion is a resin emulsion having a core-shell type structure in which a core part is a hydrophobic acrylic resin and a shell part is an aqueous urethane resin or acrylic graft aqueous resin.   
     
     
         4 . The ink composition for inkjet recording according to  claim 1 , wherein
 the pigment dispersant is a polyoxyethylene anionic surfactant.   
     
     
         5 . The ink composition for inkjet recording according to  claim 4 , wherein
 the polyoxyethylene anionic surfactant is at least one material selected from polyoxyethylene alkyl ether carboxylate, polyoxyethylene alkyl ether sulfuric acid ester salt and polyoxyethylene alkyl ether phosphate.   
     
     
         6 . The ink composition for inkjet recording according to  claim 1 , further comprising:
 a penetrant including 3-methoxy-3-methyl-1-butanol.   
     
     
         7 . The ink composition for inkjet recording according to  claim 1 , wherein
 the water-soluble organic solvent contains more than 50% by weight of glycerin.   
     
     
         8 . An ink cartridge containing an ink composition for inkjet recording, the ink composition comprising:
 a pigment;   a pigment dispersant;   water;   a water-soluble solvent;   a wettability enhancer including 2,5,8,11-tetramethyl-6-dodecyne-5,8-diol; and   an aqueous resin emulsion   wherein an amount of the wettability enhancer is 0.1-5% and an amount of the aqueous resin emulsion is 1-30% of the total weight of the ink.   
     
     
         9 . The ink cartridge according to  claim 8 , wherein
 the aqueous resin emulsion is an acrylic resin emulsion.   
     
     
         10 . The ink cartridge according to  claim 8 , wherein
 the acrylic resin emulsion is a resin emulsion having a core-shell type structure in which a core part is a hydrophobic acrylic resin and a shell part is an aqueous urethane resin or acrylic graft aqueous resin.   
     
     
         11 . The ink cartridge according to  claim 8 , wherein
 the pigment dispersant is a polyoxyethylene anionic surfactant.   
     
     
         12 . The ink cartridge according to  claim 11 , wherein
 the polyoxyethylene anionic surfactant is at least one material selected from polyoxyethylene alkyl ether carboxylate, polyoxyethylene alkyl ether sulfuric acid ester salt and polyoxyethylene alkyl ether phosphate.   
     
     
         13 . The ink cartridge according to  claim 8 , wherein the ink composition further comprises:
 a penetrant including 3-methoxy-3-methyl-1-butanol.   
     
     
         14 . The ink cartridge according to  claim 8 , wherein
 the water-soluble organic solvent contains more than 50% by weight of glycerin.   
     
     
         15 . An inkjet recording apparatus, comprising:
 a recording section including an inkjet head from which ink is ejected onto a recording medium that is conveyed from a recording medium feeding section to a recording medium discharge section, wherein the ink has an ink composition that includes   a pigment;   a pigment dispersant;   water;   a water-soluble solvent;   a wettability enhancer including 2,5,8,11-tetramethyl-6-dodecyne-5,8-diol; and   an aqueous resin emulsion   wherein an amount of the wettability enhancer is 0.1-5% and an amount of the aqueous resin emulsion is 1-30% of the total weight of the ink.   
     
     
         16 . The apparatus according to  claim 15 , wherein
 the aqueous resin emulsion is an acrylic resin emulsion.   
     
     
         17 . The apparatus according to  claim 15 , wherein
 the acrylic resin emulsion is a resin emulsion having a core-shell type structure in which a core part is a hydrophobic acrylic resin and a shell part is an aqueous urethane resin or acrylic graft aqueous resin.   
     
     
         18 . The apparatus according to  claim 15 , wherein
 the pigment dispersant is a polyoxyethylene anionic surfactant that is at least one material selected from polyoxyethylene alkyl ether carboxylate, polyoxyethylene alkyl ether sulfuric acid ester salt and polyoxyethylene alkyl ether phosphate.   
     
     
         19 . The apparatus according to  claim 15 , wherein the ink composition further includes:
 a penetrant including 3-methoxy-3-methyl-1-butanol.   
     
     
         20 . The apparatus according to  claim 15 , wherein the water-soluble organic solvent contains more than 50% by weight of glycerin.