Pressure-Responsive Particles for Adhesive Image Stability
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Solution Overview
Problem
Existing pressure-sensitive adhesive compositions and toners face challenges in achieving high adhesiveness and preventing image loss during peeling, particularly due to issues with the liberation rate of inorganic oxide particles and the compatibility of styrene-based and (meth)acrylic acid ester-based resins.
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, incorporating inorganic oxide particles with a liberation rate between 10% to 40% by mass, ensuring effective adhesion and preventing image loss upon peeling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pressure-responsive particles contain inorganic oxide particles with low liberation rate (lower than 10% by mass), then image stability is improved, but adhesiveness deteriorates
Solution Approach 1:
The patent changes the liberation rate parameter of inorganic oxide particles from the conventional low range (lower than 10%) to an optimized range (10% to 40%). This parameter change simultaneously achieves both high adhesiveness (due to sufficient inorganic oxide liberation providing adhesion sites) and prevents image loss (by controlling the liberation rate within a specific range that maintains image stability).
Solution Approach 2:
The patent creates a composite pressure-responsive particle system combining organic resins (styrene-based and (meth)acrylic acid ester-based) with inorganic oxide particles. This composite structure allows the organic component to provide structural integrity and image stability while the inorganic oxide component provides adhesion sites, resolving the contradiction between image stability and adhesiveness.
2Ease of manufacture
If pressure-responsive particles use homopolymer of (meth)acrylic acid ester, then manufacturing simplicity is improved, but adhesiveness deteriorates
Solution Approach 1:
The patent employs a composite resin system combining styrene-based resin and (meth)acrylic acid ester-based resin rather than using a simple homopolymer. This composite resin provides superior adhesiveness through synergistic effects while maintaining reasonable manufacturing complexity, as both resins can be incorporated into the pressure-responsive particle formulation through established polymerization techniques.
Solution Approach 2:
The patent assigns different functional roles to different resin components: the styrene-based resin provides structural framework and pressure responsiveness, while the (meth)acrylic acid ester-based resin contributes to adhesiveness. This functional differentiation at the molecular level achieves high adhesiveness without requiring complex manufacturing processes.
3Strength
If pressure-responsive particles have high inorganic oxide liberation rate (higher than 40% by mass), then adhesiveness is improved, but image loss occurs during peeling
Solution Approach 1:
The patent identifies and optimizes the liberation rate parameter of inorganic oxide particles, establishing an upper limit of 40% to prevent image loss during peeling. By controlling the liberation rate within the 10-40% range, the patent achieves sufficient adhesiveness (through adequate inorganic oxide liberation) while preventing the harmful effect of image loss that occurs at higher liberation rates.
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 pressure-responsive particles exhibit enhanced adhesiveness and prevent image loss during peeling, outperforming previous technologies by maintaining adhesive force and uniformity across the surface.
Implementation Method 1
pressure-responsive particles which contain a styrene-based resin and a (meth)acrylic acid ester-based resin, have higher adhesiveness that enables surfaces of a recording medium to peelably adhere to each other
Implementation Method 2
a liberation rate of the inorganic oxide particles is 10% by mass or higher and 40% by mass or lower, the pressure-responsive particles have at least two glass transition temperatures
Data Source
AI summary
Pressure-responsive particles include pressure-responsive base particles and inorganic oxide particles, in which the pressure-responsive base particles contain a styrene-based resin which contains styrene and other vinyl monomers as polymerization components and a (meth)acrylic acid ester-based resin which contains at least two kinds of (meth)acrylic acid esters as polymerization components and in which amass ratio of the (meth)acrylic acid esters to all polymerization components is 90% by mass or higher, a liberation rate of the inorganic oxide particles is 10% by mass or higher and 40% by mass or lower, the pressure-responsive particles have at least two glass transition temperatures, and a difference between a lowest glass transition temperature and a highest glass transition temperature is 30° C. or higher.