Patent ID: 7625614
Filing Date: 2009-12-01
Classification: B41M

Abstract:
1. An ink recording medium comprising an ink-receiving layer of a microporous structure formed on a support, wherein the ink-receiving layer has a phenolic compound having a sulfonyl group and a diffusible sulfinic acid salt, the phenolic compound having a sulfonyl group being at least one selected from a compound represented by the following general formula (I) and a compound represented by the following general formula (II): wherein R1 and R2 are individually hydrogen, a substituted or unsubstituted and linear, branched, or cyclic alkyl group (having 1 to 30 carbon atoms), an alkoxy group (having 1 to 20 carbon atoms), a substituted or unsubstituted aryl group (having 6 to 30 carbon atoms), a mono-or di-substituted amino group (the substituent group(s) being an alkyl, acyl or alkenyl group having 1 to 20 carbon atoms), sulfide, disulfide, an amide group, an ester group, an alkenyl group, a hydroxyl group, or a substituted or unsubstituted ureido group (having 1 to 20 carbon atoms) and may form a bis form, with the proviso that both R1 and R2 are not hydrogen at the same time, at least one of R1 and R2, which is not hydrogen, is located at an o-position, and these functional groups may have an additional substituent, R3 is a substituted or unsubstituted and saturated or unsaturated alkylene group having 1 to 30 carbon atoms, a carbonyl group or a thiocarbonyl group, and R4 is a saturated alkyl, alkoxy, or alkenyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted aryloxy group, with the proviso that these functional groups may be substituted by a hydroxy, amino, carboxyl, alkoxy, alkenyl, or alkyl group, wherein R1 and R2 are individually hydrogen, a substituted or unsubstituted and linear, branched, or cyclic alkyl group (having 1 to 30 carbon atoms), an alkoxy group (having 1 to 20 carbon atoms), a substituted or unsubstituted aryl group (having 6 to 30 carbon atoms), a mono-or di-substituted amino group (the substituent group(s) being alkyl, acyl, or alkenyl group having 1 to 20 carbon atoms), sulfide, disulfide, an amide group, an ester group, an alkoxy group, an alkenyl group, a hydroxyl group, or a substituted or unsubstituted ureido group (having 1 to 20 carbon atoms) and may form a bis form, with the proviso that both R1 and R2 are not hydrogen at the same time, at least one of R1 and R2, which is not hydrogen, is located at an o-position, and these functional groups may have an additional substituent, and R3 is a saturated alkyl, alkoxy, or alkenyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted aryloxy group, with the proviso that these functional groups may be substituted by a hydroxy, amino, carboxyl, alkoxy, alkenyl, or alkyl group.