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 is provided comprising at least a particulate pigment having a sulfur-containing dispersibility providing group chemically bonded to the surface thereof with a treatment containing sulfur, a penetrating agent, and water, characterized by the following aspects: (a) an ink for ink jet recording wherein the sulfur content in the liquid component of the ink is kept to a predetermined level or less, (b) an ink for ink jet recording wherein the amount of the sulfur-containing dispersibility providing group is kept to a predetermined value or more, (c) an ink for ink jet recording wherein the sulfur-containing dispersibility providing group is a predetermined ion group and the cation as its counter ion is predetermined, (d) an ink for ink jet recording comprising a specific preservative incorporated therein, and (e) an ink for ink jet recording comprising a predetermined penetrating agent incorporated therein, which can give a fast-drying image having a high print density free from print bleeding, has a high storage stability and can be easily prepared. An ink set and ink cartridge for ink jet recording comprising the foregoing ink are also provided.