Microcapsule Color Material Using Dual-Aromatic Alcohols
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Solution Overview
Problem
Existing ink compositions for writing instruments using thermally discoloring microcapsules have limited freedom in selecting discoloring temperature controllers and materials, leading to restricted manufacturing efficiency and diversification in thermal discoloration.
Innovation Solution
A microcapsule color material comprising a leuco dye, a developer, and a specific discoloring temperature controller, represented by Formula (I), with an average particle diameter of 0.1 to 1.0 µm, allowing for expanded material selection and manufacturing flexibility, and improved thermal discoloration diversification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If specific ester compounds or ether compounds are used as discoloring temperature controllers, then thermal discoloration control is achieved, but freedom in material selection is limited and manufacturing load increases
Solution Approach 1:
The patent applies universality by using alcohol compounds having two aromatic rings as a multi-functional component that simultaneously serves as a discoloring temperature controller and a reaction medium. This eliminates the need for separate specific ester or ether compounds, thereby expanding material selection freedom while simplifying the manufacturing process. The compound can be selected from various alcohols (e.g., benzyl alcohol, phenethyl alcohol, cinnamyl alcohol) providing versatile options without increasing manufacturing complexity.
2Adaptability or versatility
If conventional discoloring temperature controllers are used, then color reaction is controlled, but diversification in thermal discoloration is insufficient
Solution Approach 1:
The patent applies parameter changes by utilizing the diverse structural parameters of alcohol compounds having two aromatic rings. By varying the alcohol component (different aromatic rings, substituents, carbon chain lengths), the discoloration temperature and characteristics can be diversified. This provides multiple thermal discoloration profiles using a single class of compounds, achieving diversification without requiring complex multi-component systems. Examples include benzyl alcohol for one discoloration profile, phenethyl alcohol for another, allowing flexible thermal response customization.
3Productivity
If microcapsule color material is used, then thermal discoloration function is provided, but utilization and diversification are not satisfactory
Solution Approach 1:
The patent applies composite materials by combining leuco dye, developer, and alcohol compounds having two aromatic rings into an integrated microcapsule color material system. This composite approach enables both effective thermal discoloration function and enhanced utilization. The alcohol compound serves dual roles as temperature controller and reaction medium within the microcapsule, improving efficiency. Additionally, the versatility of selecting different alcohol compounds provides diversification in thermal discoloration characteristics, resolving the contradiction between utilization and diversification.
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 solution enhances the freedom of material selection and manufacturing efficiency, improving thermal discoloration and utilization of microcapsule color materials, while maintaining excellent color optical density, erasability, and recoloring properties.
Implementation Method 1
a microcapsule color material making use of a developing and erasing mechanism of a leuco dye... a color reaction caused by both components... discoloring temperature controller
Data Source
AI summary
Provided is a microcapsule color material prepared by using a leuco dye, wherein the microcapsule color material is increased in a freedom of material selection in selecting a discoloring temperature controller and expanded in a freedom of setting in setting an amount thereof in the microcapsule color material prepared by using the leuco dye, and it attempts to be reduced in a load of manufacturing and improved in a diversification in thermal discoloration and can be further raised in a utilization of a microcapsule color material, and further provided is an ink composition for writing instruments containing the above microcapsule color material. The microcapsule color material is characterized by containing at least a leuco dye, a developer and a discoloring temperature controller represented by the following Formula (I) : (wherein R1 and R2 represent an alkyl group having 7 to 21 carbon atoms, and R3 represents a hydrogen atom or an alkyl group having 1 to 7 carbon atoms).