Printing ink jet ink composition and recording method
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Solution Overview
Problem
Ink jet ink compositions containing C.I. Acid Black 172 and/or C.I. Acid Black 52:1 face issues with aggregation at high dye concentrations, leading to degraded intermittent ejection performance, and at low concentrations, resulting in poor color development.
Innovation Solution
A printing ink jet ink composition comprising an acidic dye (at least C.I. Acid Black 172 or C.I. Acid Black 52:1), a water-soluble organic solvent (glycol ether compound with a standard boiling point of 195° C. to 290° C.), a lactam compound (1-(2-hydroxyethyl)-2-pyrrolidone or ε-caprolactam), and water, with specific mass ratios to prevent aggregation and maintain ejection stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the content of acidic dye is increased to improve color development property, then color development property is improved, but aggregation occurs and intermittent ejection performance is degraded
Solution Approach 1:
The patent introduces a lactam compound as an intermediary substance to mediate between the acidic dye and the ink composition. The lactam compound specifically interacts with C.I. Acid Black 172 and C.I. Acid Black 52:1 to prevent aggregation, enabling high dye content (10% or more) to be maintained without degrading ejection performance. This intermediary mechanism resolves the contradiction by allowing both high color development and reliable ejection.
Solution Approach 2:
The patent changes the chemical parameter composition by specifying a mass ratio of the lactam compound to the acidic dye within 0.05 to 2.0. This parameter control ensures that the dye molecules remain dispersed at high concentrations through the protective effect of the lactam compound, thus maintaining both color development property and intermittent ejection performance simultaneously.
2Quantity of substance
If the content of acidic dye is increased to improve color development property, then color development property is improved, but viscosity increases and aggregation occurs
Solution Approach 1:
The lactam compound serves as a protective intermediary that binds to the acidic dye molecules, preventing them from aggregating even at high concentrations. This intermediary interaction maintains compositional stability while allowing high dye content for superior color development.
Solution Approach 2:
The patent creates a composite ink composition system where the lactam compound and acidic dye form a stable complex. This composite structure prevents aggregation and maintains homogeneity throughout the ink composition, enabling high dye content without compromising stability.
3Quantity of substance
If the content of acidic dye is increased to improve color development property, then color development property is improved, but intermittent ejection performance is degraded
Solution Approach 1:
The lactam compound acts as a protective intermediary that maintains dye molecule dispersion at high concentrations, ensuring smooth ink flow and reliable intermittent ejection. This enables high productivity through consistent ejection performance while maintaining high dye content for excellent color development.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The composition achieves excellent intermittent ejection performance and color development, even at high acidic dye concentrations, by suppressing aggregation and maintaining low viscosity, thus ensuring stable ink jet printing.
Implementation Method 1
the water-soluble organic solvent includes a glycol ether compound having a standard boiling point of 195° C. to 290° C., the lactam compound includes at least one selected from the group consisting of 1-(2-hydroxyethyl)-2-pyrrolidone and ε-caprolactam
Data Source
AI summary
A printing ink jet ink composition of the present disclosure is an ink composition which includes an acidic dye; a water-soluble organic solvent; a lactam compound; and water, the acidic dye includes at least one selected from the group consisting of C.I. Acid Black 172 and C.I. Acid Black 52:1, a content of the acidic dye with respect to a total mass of the ink composition is 10 percent by mass or more, the water-soluble organic solvent includes a glycol ether compound having a standard boiling point of 195° C. to 290° C., the lactam compound includes at least one selected from the group consisting of 1-(2-hydroxyethyl)-2-pyrrolidone and ε-caprolactam, and a mass ratio of the lactam compound to the glycol ether compound is 3.5 to 20.