Ink Composition for Writing Instruments Using Composite Coloring Materials
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Solution Overview
Problem
Conventional ink compositions for writing instruments using halochromic dyes, leuco dyes, and photochromic compounds suffer from poor solubility in solvents, leading to bleeding and feathering on written lines and inadequate water resistance.
Innovation Solution
An ink composition is developed by combining leuco dyes, halochromic dyes, and photochromic compounds with a specific sulfonic acid resin, optimizing their mass ratios to enhance solubility and integration with the resin, thereby reducing bleeding and feathering and improving water resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If halochromic dyes, leuco dyes, and photochromic compounds are used as coloring materials, then color development and special effects are achieved, but solubility in ink solvents is poor leading to bleeding and feathering
Solution Approach 1:
The patent combines multiple coloring materials (halochromic dyes, leuco dyes, photochromic compounds) with specific resins and solvents to create a composite ink formulation. This composite approach allows each component to contribute its unique properties while the overall formulation achieves good solubility and prevents bleeding and feathering on written lines.
2Adaptability or versatility
If conventional coloring materials are used, then color variety is achieved, but water resistance is insufficient
Solution Approach 1:
The patent modifies the chemical parameters of the ink formulation by selecting specific resins and solvents with appropriate molecular weights and chemical structures. These parameter changes enhance the water resistance of the ink while maintaining the color variety provided by different coloring materials, achieving both objectives simultaneously.
3Reliability
If more coloring material is added to enhance color intensity, then color development is improved, but solubility decreases causing precipitation and poor writing quality
Solution Approach 1:
The patent optimizes the concentration parameters of coloring materials within specific ranges and adjusts other formulation parameters (resin type, solvent composition) to maintain solubility even at higher coloring material concentrations. This allows achieving intense color development without precipitation or poor writing quality.
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 composition exhibits improved solubility, reduced bleeding and feathering, and enhanced water resistance, allowing for a wide range of color development and flexibility in blending, suitable for various writing instruments.
Implementation Method 1
a coloring material obtained by adding at least one selected from a leuco dye, a halochromic dye and a photochromic compound to a specific compound
Implementation Method 2
a coloring material obtained by adding at least one selected from a leuco dye, a halochromic dye and a photochromic compound to a specific compound
Implementation Method 3
a coloring material obtained by adding at least one selected from a leuco dye, a halochromic dye and a photochromic compound to a specific compound
Implementation Method 4
a coloring material obtained by adding at least one selected from a leuco dye, a halochromic dye and a photochromic compound to a specific compound
Data Source
AI summary
Provided are an ink composition for writing instruments which has a good solubility of a coloring material in an ink solvent and which is less liable to cause bleeding and feathering on the written lines and is improved in a water resistance, and a coloring material used for preparing the above ink composition. The coloring material includes a material obtained by adding at least one selected from a leuco dye, a halochromic dye and a photochromic compound to a compound represented by the following Formula (I): The ink composition for writing instruments is characterized by containing the coloring material described above.