Aqueous ink jet ink composition and recording method
Solution Overview
Problem
Aqueous ink jet inks containing C.I. Reactive Blue 49 suffer from inferior stability in discharge and nozzle clogging, making it difficult to recover clogged nozzles even after cleaning.
Innovation Solution
An aqueous ink jet ink composition comprising a color material with two or more alkali metal ions as counterions, including sodium, and a specific ratio of sodium to other alkali metal ions, along with a water-soluble organic solvent and water, enhances stability and clogging recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If aqueous ink jet ink containing C.I. Reactive Blue 49 is used, then optical density and light fastness are improved, but discharge stability and nozzle clogging recovery deteriorate
Solution Approach 1:
The patent changes the chemical parameters of the ink composition by specifying precise ratios of alkali metal ions (sodium, potassium, lithium) as counterions for the reactive blue dye. This parameter optimization resolves the contradiction by achieving both high light fastness and discharge stability simultaneously, eliminating nozzle clogging while maintaining the desired optical properties.
2Illumination intensity
If aqueous ink jet ink containing C.I. Reactive Blue 49 is used, then optical density and light fastness are improved, but nozzle clogging recovery deteriorates
Solution Approach 1:
The patent optimizes the chemical composition parameters by controlling the types and ratios of alkali metal counterions in the ink formulation. This resolves the contradiction by preventing nozzle clogging and enabling easy recovery, while simultaneously maintaining high light fastness and optical density through the optimized dye-solvent-ion complex.
Data Source
AI summary
An aqueous ink jet ink composition of the present disclosure contains a color material represented by Formula (1) below, a water-soluble organic solvent, and water. The color material represented by Formula (1) below contains two or more alkali metal ions as counterions, and the counterions include at least a sodium ion.(In Formula (1), M represents a counterion.)