Patent ID: 8614264
Filing Date: 2013-12-24
Classification: B41M,C09D,Y10T

Abstract:
1. An aqueous ink composition used in an ink jet recording method, the aqueous ink composition comprising: a pigment containing C. I. Pigment Yellow 180; a first solvent having a content, W1, of 3% to 6% by mass containing at least one of 1,2-hexanediol and 1,2-pentanediol; and a second solvent having a content, W2, of 6% to 25% by mass, and the second solvent containing at least one solvent selected from the group consisting of 2-pyrrolidone, N-methyl-2-pyrrolidone, N,N′-dimethylpropyleneurea, 1,3-dimethyl-2-imidazolidinone, tetramethylurea, dimethyl sulfoxide, and hexamethylphosphoric acid triamide, wherein the aqueous ink composition does not contain glycerol, and the ratio W2/W1 is 2 to 8, and wherein the aqueous ink composition has a viscosity change after storage at −20° C. for 3 days and then further stored at 20° C. for about 4 hours, that varies in the range of more than −0.3 mPa·s and less than 0.3 mPa·s relative to the viscosity of the aqueous ink composition before storage.