Pressure-Responsive Particles with Silica Coating for Adhesiveness
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Solution Overview
Problem
Existing pressure-responsive particles fail to achieve optimal adhesiveness and storability due to inconsistent surface coating rates of silica particles before and after stress application, leading to inadequate adhesion between recording media surfaces.
Innovation Solution
The development of pressure-responsive particles comprising styrene-based and (meth)acrylic acid ester-based resins with a high mass ratio of (meth)acrylic acid esters, which undergo phase transition under pressure, combined with silica particles that maintain a specific surface coating rate ratio before and after stress application, ensuring both adhesiveness and storability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If pressure-responsive particles are used with inconsistent surface coating rates of silica particles, then manufacturing is simplified, but adhesiveness between recording media surfaces deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the surface coating rate ratio of silica particles (Cs2/Cs1) to fall within 0.05 to 0.40. This parameter optimization resolves the contradiction by achieving both ease of manufacture through standardized production processes and reliable adhesiveness through controlled particle surface properties. The specific ratio range ensures consistent adhesive performance while maintaining manufacturing simplicity.
Solution Approach 2:
The patent uses composite materials by combining pressure-responsive base particles with silica particles in a controlled surface coating configuration. This composite structure integrates the pressure-responsive properties of the base particles with the surface coating characteristics of silica particles, achieving both manufacturability and reliable adhesion through the synergistic combination of different material properties.
2Reliability
If pressure-responsive particles are designed for high adhesiveness, then adhesion between recording media surfaces improves, but storability and aggregation control deteriorate
Solution Approach 1:
The patent resolves this contradiction through parameter changes by optimizing the surface coating rate ratio of silica particles to be within 0.05 to 0.40. This controlled parameter ensures that particles maintain adequate adhesiveness while preventing excessive aggregation during storage. The specific ratio range balances adhesive force with particle stability, allowing particles to adhere effectively when needed while remaining stable during storage.
Solution Approach 2:
The patent applies local quality by creating a specific surface coating distribution of silica particles on the pressure-responsive base particles. The surface coating is not uniform but controlled to specific locations and densities, with the coating rate ratio optimized to provide adhesive functionality at the particle surface while maintaining internal particle stability and resistance to aggregation during storage.
3Reliability
If silica particles are applied at high surface coating rates, then adhesiveness improves, but contamination and aggregation in manufacturing apparatus increase
Solution Approach 1:
The patent uses parameter changes by setting the surface coating rate ratio of silica particles (Cs2/Cs1) within the specific range of 0.05 to 0.40. This optimized parameter prevents excessive silica particle accumulation that would cause contamination and aggregation in manufacturing equipment, while still providing sufficient adhesive functionality. The controlled ratio ensures particles adhere to recording media without generating harmful contamination effects.
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 particles exhibit enhanced adhesiveness and storability by maintaining a balanced surface coating rate of silica particles, allowing for effective adhesion between recording media surfaces while preventing aggregation and contamination in the manufacturing apparatus.
Implementation Method 1
the pressure-responsive particles have higher adhesiveness allowing surfaces of recording media to peelably adhere to each other... the pressure-responsive particles undergo phase transition by pressure
Implementation Method 2
pressure-responsive particles comprising pressure-responsive base particles and silica particles... maintaining a balanced surface coating rate of silica particles
Data Source
AI summary
Pressure-responsive particles include pressure-responsive base particles and silica particles, in which the pressure-responsive base particles contain a styrene-based resin that contains styrene and other vinyl monomers as polymerization components and a (meth)acrylic acid ester-based resin that contains at least two kinds of (meth)acrylic acid esters as polymerization components and in which a ratio of a mass of the (meth)acrylic acid esters to a total mass of polymerization components is 90% by mass or more, the pressure-responsive particles have at least two glass transition temperatures, a difference between a lowest glass transition temperature and a highest glass transition temperature is 30° C. or higher, and a ratio of a surface coating rate Cs2 by the silica particles after application of the following first stress to a surface coating rate Cs1 by the silica particles before application of stress satisfies a relationship of 0.4≤Cs2/Cs1≤0.8.