Patent ID: 9016845
Filing Date: 2015-04-28
Classification: B41J,C09D

Abstract:
1. An ink for an ink-jet recording apparatus, comprising: water; a pigment dispersion including a pigment and a resin; a humectant; and an organic solvent, wherein the resin has a weight-average molecular weight of 30,000 to 150,000, wherein the content of the resin is 1.5% to 6.0% by mass with respect to the mass of the ink, wherein the humectant contains glycerol and 1,3-propanediol, wherein the total content (P+Q) of the content of the glycerol (P) and the content of the 1,3-propanediol (Q) in the ink is 15% to 40% by mass with respect to the mass of the ink, wherein the mass ratio (P/Q) is 0.25-1.00, wherein the organic solvent is selected from the group consisting of 1,2-hexanediol, 1,2-octanediol, 2,4-diethyl-1,5-pentanediol, and 2-butyl-2-ethyl-1,3-propanediol, wherein the content of the organic solvent is 0.1% to 3.0% by mass with respect to the mass of the ink.