Cyan Ink Dye Composition for Light and Ozone Resistance
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Solution Overview
Problem
Conventional cyan inks for ink-jet recording lack sufficient light resistance and ozone resistance, and often exhibit bronzing, a phenomenon of irregular reflection on glossy surfaces, due to the use of copper phthalocyanine dyes which are prone to fading and discoloration.
Innovation Solution
A water-based ink composition comprising a specific dye represented by general formula (1) and at least one dye selected from general formula (2a), (2b), C. I. Direct Blue 199, or C. I. Direct Blue 86, which includes a copper phthalocyanine nucleus with specific substituents and ionic hydrophilic groups, enhancing light and ozone resistance while reducing bronzing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If copper phthalocyanine dyes are used for cyan ink, then light resistance is improved, but ozone resistance deteriorates
Solution Approach 1:
The patent uses a composite dye system combining copper phthalocyanine dye (for light resistance) with a specific organic dye component (for ozone resistance). This composite coloring agent maintains the superior light resistance of copper phthalocyanine while the organic dye component provides protection against ozone fading, resolving the contradiction between light resistance and ozone resistance.
2Reliability
If copper phthalocyanine dyes are used for cyan ink, then color developing properties are improved, but bronzing occurs
Solution Approach 1:
The patent modifies the local chemical structure of the copper phthalocyanine dye by introducing specific substituent groups (such as sulfonate or carboxylate groups) at particular positions on the phthalocyanine ring. This local structural modification improves solubility and prevents aggregation on the recording medium surface, thereby eliminating bronzing while preserving the excellent color developing properties of the copper phthalocyanine core structure.
3Ease of manufacture
If conventional cyan dyes are used, then ease of manufacture is improved, but light resistance deteriorates
Solution Approach 1:
The patent changes the chemical parameters of conventional cyan dyes by introducing specific functional groups (such as sulfonate, carboxylate, or hydroxyl groups) and modifying the molecular structure to include extended conjugation systems. These parameter changes enhance light resistance while the modified structures remain compatible with conventional ink formulation processes, maintaining ease of manufacture.
Data Source
AI summary
A water-based ink for ink-jet recording includes a coloring agent, water, and a water-soluble organic solvent. The coloring agent includes the following a dye (1) and a dye (2).dye (1): a dye represented by the general formula (1)dye (2): at least one dye selected from the group consisting of dyes represented by the general formula (2a), dyes represented by the general formula (2b), C. I. Direct Blue 199, and C. I. Direct Blue 86