Ink Set Stabilizes Hue via Pigment Electron States
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Solution Overview
Problem
Existing ink-jet printing technologies fail to provide sufficient weathering resistance for image regions containing red-based and yellow pigments when used in outdoor applications, as they tend to exhibit significant changes in hue due to light, heat, and humidity.
Innovation Solution
An ink set comprising a water-based ink with a barbituric acid-derived pigment and another water-based ink with a diketopyrrolopyrrole pigment, which are combined to form images on low-water absorbing or non-water absorbing printing media, stabilizing the electron state through molecular structure similarity and electrostatic interactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional ink-jet inks containing red-based and yellow pigments are used, then coloration is achieved, but weathering resistance deteriorates due to significant hue changes under outdoor conditions
Solution Approach 1:
The invention changes the chemical parameters of the pigments by specifying precise compositional ratios: red-based pigment containing 5-20 mass% azo group and yellow-based pigment containing 5-20 mass% barbituric acid-derived structure. This parameter optimization stabilizes electron states and suppresses hue changes under outdoor conditions, resolving the contradiction between achieving coloration and maintaining weathering resistance.
Solution Approach 2:
The invention creates a composite ink system combining specific red-based and yellow-based pigments with controlled compositional ratios. The composite structure enables synergistic effects where the azo group in red pigment and barbituric acid-derived structure in yellow pigment work together to stabilize electron states, preventing hue changes while maintaining vibrant coloration for outdoor applications.
2Duration of action of stationary object
If pigments are used to form image regions, then coloration is achieved, but durability under outdoor applications deteriorates due to light, heat, and humidity exposure
Solution Approach 1:
The invention optimizes the chemical composition parameters of the pigments to enhance durability. The red-based pigment contains 5-20 mass% azo group while the yellow-based pigment contains 5-20 mass% barbituric acid-derived structure. These parameter specifications create stable electron states that resist degradation from light, heat, and humidity, directly improving durability for outdoor applications.
Solution Approach 2:
The invention replaces conventional short-lived pigments that fade under outdoor exposure with specially formulated long-lasting pigments. The controlled compositional ratios of azo group and barbituric acid-derived structure create chemically stable pigments that maintain their coloration over extended periods under environmental stress, effectively transitioning from temporary to permanent coloration.
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 ink set effectively suppresses changes in hue and enhances weathering resistance of image regions containing red-based and yellow pigments, ensuring durability even in outdoor conditions.
Implementation Method 1
stabilizing the electron state through molecular structure similarity and electrostatic interactions
Data Source
AI summary
The present invention relates to an ink set for ink-jet printing which contains at least a water-based ink (I) and a water-based ink (II) in which the water-based ink (I) contains a pigment (A1) having a barbituric acid-derived structure, and the water-based ink (II) contains a diketopyrrolopyrrole pigment (A2), an ink-jet printing method using the ink set, and an ink-jet printed material.