Ink Composition for Inkjet Printing

Abstract

The invention provides an ink composition for ink-jet printing which does not cause clogging of nozzles of an ink-jet printer during printing, to thereby provide a print of desired printing quality; which ensures an appropriate drying rate of printed images; and which attains excellent color development. The ink composition for ink-jet printing, containing a pigment, a binder resin, a pigment dispersant, and a solvent, wherein the solvent is formed of (1) at least one glycol ether and at least one of a lactone compound and 2-pyrrolidone, or (2) at least one glycol ether acetate and at least one of cyclohexane and isophorone.

1 - 5 . (canceled)  
     
     
         6 . An ink composition for ink-jet printing, comprising a pigment, a binder resin, a pigment dispersant, and a solvent, characterized in that the solvent is formed of 
 (1) at least one glycol ether and at least one of a lactone compound and 2-pyrrolidone, or    (2) at least one glycol ether acetate and isophorone.    
     
     
         7 . An ink composition for ink-jet printing as described in  claim 6 , wherein the binder resin is a vinyl chloride copolymer resin.  
     
     
         8 . An ink composition for ink-jet printing as described in  claim 6 , wherein the pigment dispersant is a polyester-polyamide resin having two or more amido groups in the one molecule thereof and a number average molecular weight of 2,000 to 15,000.  
     
     
         9 . An ink composition for ink-jet printing as described in  claim 6 , wherein the glycol ether is (di)ethylene glycol (di)alkyl ether, (di)propylene glycol (di)alkyl ether, or triethylene glycol monoalkyl ether.  
     
     
         10 . An ink composition for ink-jet printing as described in  claim 6 , wherein the glycol ether acetate is propylene glycol monomethyl ether acetate or ethylene glycol monobutyl ether acetate.  
     
     
         11 . An ink composition for ink-jet printing as described in  claim 7 , wherein the pigment dispersant is a polyester-polyamide resin having two or more amido groups in the one molecule thereof and a number average molecular weight of 2,000 to 15,000.  
     
     
         12 . An ink composition for ink-jet printing as described in  claim 7 , wherein the glycol ether is (di)ethylene glycol (di)alkyl ether, (di)propylene glycol (di)alkyl ether, or triethylene glycol monoalkyl ether.  
     
     
         13 . An ink composition for ink-jet printing as described in  claim 8 , wherein the glycol ether is (di)ethylene glycol (di)alkyl ether, (di)propylene glycol (di)alkyl ether, or triethylene glycol monoalkyl ether.  
     
     
         14 . An ink composition for ink-jet printing as described in  claim 9 , wherein the glycol ether is (di)ethylene glycol (di)alkyl ether, (di)propylene glycol (di)alkyl ether, or triethylene glycol monoalkyl ether.  
     
     
         15 . An ink composition for ink-jet printing as described in  claim 7 , wherein the glycol ether acetate is propylene glycol monomethyl ether acetate or ethylene glycol monobutyl ether acetate.  
     
     
         16 . An ink composition for ink-jet printing as described in  claim 8 , wherein the glycol ether acetate is propylene glycol monomethyl ether acetate or ethylene glycol monobutyl ether acetate.  
     
     
         17 . An ink composition for ink-jet printing as described in  claim 9 , wherein the glycol ether acetate is propylene glycol monomethyl ether acetate or ethylene glycol monobutyl ether acetate.