INK FOR INK-JET RECORDING AND PROCESS FOR PRODUCING THE SAME, INK SET FOR INK-JET RECORDING, AND INK CARTRIDGE

摘要

An ink for ink-jet recording which comprises: pigment particles having sulfur-containing dispersibility-imparting groups chemically bonded to the surface thereof with a sulfurized treating agent; an infiltrating agent; and water. It may be: (a) an ink wherein the sulfur content in the liquid component(s) of the ink is not higher than a given level; (b) an ink wherein the amount of the sulfur-containing dispersibility-imparting groups is not smaller than a given value; (c) an ink wherein the sulfur-containing dispersibility-imparting groups are specific ionic groups and the counter ions are specific cations; (d) an ink containing a specific antiseptic; or (e) an ink containing a specific infiltrating agent. The ink can give a printed image free from blurring and having quick-drying properties and a high density. It further has high storage stability and can be easily prepared. Also provided are an ink set for ink-jet recording and an ink cartridge which each contains the ink.