Patent ID: 8283005
Filing Date: 2012-10-09
Classification: B41M

Abstract:
1. An inkjet recording medium comprising, on a substrate, an ink-receiving layer comprising inorganic fine particles and an organic nitrogen-containing cationic polyurethane, the organic nitrogen-containing cationic polyurethane being contained in a greater quantity in a half of the ink-receiving layer at a side nearer to the substrate (a near-substrate side) than in a half of the ink-receiving layer at a side further from the substrate (a far-substrate side) when the ink-receiving layer is divided into two equal parts by a plane parallel to the substrate, wherein the ink-receiving layer has two or more constituent layers and an uppermost constituent layer lying furthest from the substrate has a thickness of from 0.05 μm to 5 μm and contains colloidal silica, wherein the ink-receiving layer further comprises a sulfur compound selected from the group consisting of a thioether compound, a thiourea compound, a disulfide compound, a sulfinic acid compound, a thiocyanic acid compound, a sulfur-containing heterocyclic compound, and a sulfoxide compound, the thioether compound being a compound represented by the following formula (1): wherein, in formula (1), R the thiourea compound being a compound having at least one structural unit represented by >N—C(═S)—N< per molecule; the disulfide compound being a compound represented by the following formula: wherein, in the formula, R the sulfinic acid compound being a compound represented by the following formula: wherein, in the formula, R represents a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, or a polymer residue; and M represents a hydrogen atom, an alkali metal atom or an ammonium.