Ink compositions for ink jet recording
AssigneesSumitomo Chemical Company, Limited, Taoka Chemical Co., Ltd.
InventorsHideo Kawashita, Mituhiro Ohta, Kazuya Ogino
Life of this patent
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Abstract
An ink composition for ink jet recording, which contains a water-soluble dye, an organic solvent and water, in which the dye is represented by the formula (1) as shown in the state of free acid: D--(SO.sub.2 CH.sub.2 CH.sub.2 SO.sub.3 H).sub.m (1) wherein D represents a dye residue selected from the group of monoazo and polyazo dyes, their complexes with Cr, Fe, Co and Cu, copper and nickel phthalocyanine dyes, anthraquinone dyes, dioxazine dyes, and formazane complex dyes, and m represents an integer of 1, 2, 3 or 4, and which is superior in its stability during preservation and while being used, thermal stability, image clearness, water resistivity, light fastness, etc.
Claims7
An ink composition for ink jet recording comprising a water-soluble dye, an organic solvent and water, wherein said dye is a compound represented by the formula (1):
- D--(SO.sub.2 CH.sub.2 CH.sub.2 SO.sub.3 H).sub.m ( 1)
- wherein D represents a dye residue selected from the group consisting of monoazo and polyazo dyes, their complexes with Cr, Fe, Co and Cu, copper and nickel phthalocyanine dyes, anthraquinone dyes, dioxazine dyes, and formazane complex dyes, and m represents an integer of 1, 2, 3 or 4, or a salt thereof.
A water-soluble dye represented by the formula (5):
- ##STR25## wherein F represents a dye residue selected from the group consisting of monoazo and polyazo dyes, their complexes with Cr, Fe, Co and Cu, copper and nickel phthalocyanine dyes, anthraquinone dyes, dioxazine dyes and formazane complex dyes;
- R and R.sub.1 independently represent a hydrogen atom, a methyl group or an ethyl group;
- A represents a lower alkylene group, a lower alkyleneoxy group, or a phenylene or naphthylene group which may be substituted with a lower alkyl, lower alkoxy or sulfonic acid group;
- X represents a chlorine atom, a fluorine atom, a --NR.sub.2 R.sub.3 group or a --OR.sub.4 group;
- R.sub.2, R.sub.3 and R.sub.4 independently represent a hydrogen atom or a phenyl or naphthyl group which may be substituted;
- and m' represents an integer of 1 or 2, or a salt thereof.
An ink composition for ink jet recording comprising a water-soluble dye, an organic solvent and water, wherein said dye is an azo compound represented by the formula:
- ##STR26## or a salt thereof.
An azo dye represented by the formula:
- ##STR27## or a salt thereof.
Dependencies are inferred from the claim text.