Aqueous Ink Silicon Dissolution Suppression
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Solution Overview
Problem
Current ink jet recording methods using pigment inks face challenges in maintaining image glossiness and stable ink ejection, particularly due to silicon dissolution in recording heads, which can lead to poor ejection and reduced glossiness, especially in multipath recording.
Innovation Solution
An aqueous ink formulation containing a solid solution of C.I. Pigment Red 122 and C.I. Pigment Violet 19, along with a resin dispersant and a urethane resin, is used to stabilize ink ejection and enhance image glossiness by preventing silicon dissolution and promoting smooth pigment layer formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a pigment ink is used to record images on glossy paper, then the color reproduction range is improved, but the glossiness of the image deteriorates
Solution Approach 1:
The patent changes the chemical parameters of the ink formulation by specifying precise proportions of cyan, magenta, and yellow pigments (each 30-70 wt% of total pigment), along with specific resin dispersants and pH controllers. This parameter optimization enables the ink to achieve both wide color gamut and high glossiness on glossy paper by balancing pigment concentration with dispersant effectiveness and pH stability.
2Manufacturing precision
If an ink containing urethane resin and surfactant is used to suppress beading, then the glossiness is improved, but the ink may not be normally ejected under particular conditions
Solution Approach 1:
The patent optimizes the pH parameter by adding alkanolamine to maintain pH between 6.0-10.0, and adjusts the surfactant concentration (0.01-5 wt% of ink weight) to achieve optimal balance. These parameter changes prevent beading and improve glossiness while maintaining stable ejection by ensuring the ink remains within acceptable viscosity and surface tension ranges across different operating conditions.
3Adaptability or versatility
If a solid solution pigment is used to achieve offset printing quality color, then the color phase is improved, but the image glossiness deteriorates under recent requirements
Solution Approach 1:
The patent uses a composite pigment system comprising multiple pigment types (cyan, magenta, yellow) in specific proportions, combined with composite resin dispersants and pH controllers. This composite formulation approach allows the ink to achieve the color phase characteristics of offset printing while maintaining high glossiness, by distributing the pigment load across multiple components and optimizing their interactions.
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 proposed ink solution enables stable, long-term ink ejection and maintains excellent glossiness even in conditions that typically reduce image quality, such as multipath recording, by suppressing silicon dissolution and improving pigment layer smoothness.
Implementation Method 1
a resin dispersant for dispersing the pigment
Implementation Method 2
enables the recording of an image having excellent glossiness
Implementation Method 3
an alkanolamine and a urethane resin... suppressing silicon dissolution
Data Source
AI summary
To provide an aqueous ink that can suppress the dissolution of silicon or a silicon compound contained in a recording head, can be stably, continuously ejected for a long time, and enables the recording of an image having excellent glossiness. An aqueous ink for ink jet includes a pigment, a resin dispersant for dispersing the pigment, an alkanolamine and a urethane resin. The pigment is a solid solution containing C.I. Pigment Red 122 and C.I. Pigment Violet 19, and the proportion (% by mass) of the C.I. Pigment Red 122 is 10% by mass or more to 90% by mass or less based on the total mass of the solid solution.