Colorable Particles with Porous Core and Resin Shell
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Solution Overview
Problem
Current methods for producing colorable materials struggle to achieve high-definition images and efficient decoloration, as they often result in particle aggregation and require excessive amounts of color developable agents, leading to high image density issues during decoloration.
Innovation Solution
A method involving a colorable material with a core-shell structure, comprising porous inorganic oxide particles as color developing agents and thermoplastic resin, where the color developable agent is uniformly carried on the particles, allowing for high-definition image formation and efficient decoloration without particle dissolution, using a dry method to maintain the powder state and prevent aggregation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional methods are used to produce colorable materials, then the production process is simpler, but particle aggregation occurs and image definition deteriorates
Solution Approach 1:
The invention segments the colorable material into core-shell structured particles with distinct functional zones: a porous inorganic oxide core for color development and a thermoplastic resin shell for protection and controlled decoloration. This segmentation prevents particle aggregation while maintaining high image definition, as each particle functions as an independent unit with optimized properties.
Solution Approach 2:
The invention applies local quality by creating particles with non-uniform structure: the core region contains porous inorganic oxide with high surface area for color development, while the shell region contains thermoplastic resin with specific melting properties for controlled decoloration. This local differentiation of properties enables simultaneous achievement of high image definition and controlled decoloration behavior.
2Quantity of substance
If excessive amounts of color developable agents are used, then coloration intensity increases, but decoloration efficiency decreases due to high image density
Solution Approach 1:
The invention uses porous inorganic oxide particles as the color developing agent, which provides extremely high surface area to volume ratio. This porous structure allows the color developable agent to be effectively distributed and activated, achieving intense coloration with minimal amounts of coloring material. The porosity enables efficient interaction between the color developable agent and the porous surface, reducing the total quantity needed while maintaining high coloration intensity that decolorates efficiently.
Solution Approach 2:
The invention creates a composite particle structure combining porous inorganic oxide core with thermoplastic resin shell. This composite structure enables the color developable agent to be concentrated in the porous core where it is most effective, while the resin shell provides controlled release during decoloration. The composite design optimizes the quantity-substance relationship by ensuring high utilization efficiency of the color developable agent, achieving intense coloration with minimal amounts that can be efficiently removed during decoloration.
3Manufacturing precision
If the color developable agent is not uniformly distributed, then production is easier, but image definition and color uniformity deteriorate
Solution Approach 1:
The invention applies preliminary action by first preparing porous inorganic oxide particles with optimized surface properties before introducing the color developable agent. The porous structure and surface treatment are established in advance to ensure uniform adsorption and distribution of the color developable agent throughout the particle population. This preliminary preparation of the core structure enables subsequent uniform coating without requiring complex real-time distribution control during manufacturing.
Solution Approach 2:
The porous inorganic oxide structure provides numerous uniform adsorption sites throughout each particle, ensuring that the color developable agent distributes evenly across the particle surface and within the porous network. This uniform distribution is achieved through the inherent porosity and surface area characteristics of the inorganic oxide, which naturally promote homogeneous agent distribution without requiring complex manufacturing controls.
4Productivity
If particle dissolution is allowed during decoloration, then decoloration speed increases, but particle integrity and image quality deteriorate
Solution Approach 1:
The invention uses a thermoplastic resin shell that acts as a flexible protective layer around the porous inorganic oxide core. This shell maintains particle integrity during handling and storage, preventing premature dissolution or degradation. During controlled decoloration, the thermoplastic resin undergoes phase transition at its melting point, temporarily becoming permeable to allow decoloration agents to reach and remove the color developable agent from the porous core, after which the shell re-solidifies to maintain particle integrity.
Solution Approach 2:
The thermoplastic resin shell undergoes reversible phase transition between solid and molten states during the decoloration process. At temperatures below its melting point, the shell maintains particle integrity and prevents dissolution. During controlled heating to the melting point, the shell transitions to a molten state that allows controlled interaction with decoloration agents, enabling color removal without permanent particle damage. After cooling, the shell re-solidifies to restore particle integrity, achieving both fast decoloration and maintained particle 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 method produces colorable particles with small diameters, achieving high image density during coloration and low image density during decoloration, with the thermoplastic resin encapsulation preventing undesirable decoloration and allowing efficient decoloration by acting on the particle surfaces.
Implementation Method 1
the thermoplastic resin encapsulation preventing undesirable decoloration and allowing efficient decoloration by acting on the particle surfaces
Implementation Method 2
porous inorganic oxide particles as color developing agents and thermoplastic resin, where the color developable agent is uniformly carried on the particles
Data Source
AI summary
According to one embodiment, a high-definition and decolorable image is formed. A method for producing a colorable material according to an embodiment includes supplying a first solution containing a color developable agent and a first solvent to a color developing agent in the form of a powder which is insoluble in the first solvent so that a first mixture of the first solution and the color developing agent maintains the powder state, and removing the first solvent from the first mixture, thereby obtaining a powder of colorable particles containing the color developable agent and the color developing agent.