Pressure Sensitive Adhesive Particles with Dual Glass Transition Temperatures
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Solution Overview
Problem
Existing pressure sensitive adhesive particles face challenges in maintaining consistent bulk density and achieving optimal adhesiveness due to fluctuations in surface roughness, which affects their loading and performance in printed materials production.
Innovation Solution
A pressure sensitive adhesive particle comprising a styrene resin and a (meth)acrylate resin with a mass ratio of (meth)acrylates at 90% or more, along with an external additive, exhibiting a surface roughness between 0.005 μm and 0.100 μm, and having at least two glass transition temperatures with a 30°C difference, facilitating pressure-induced phase transition and improved adhesiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the surface roughness of pressure sensitive adhesive particles is reduced to less than 0.005 μm, then the surface smoothness is improved, but the bulk density becomes unstable and fluctuates easily
Solution Approach 1:
The patent applies parameter changes by optimizing the surface roughness to a specific range (0.005 μm or more and 0.100 μm or less) rather than simply minimizing it. This parameter optimization resolves the contradiction by finding the optimal point where surface smoothness is sufficient while bulk density stability is maintained. The dual glass transition temperature design (difference of 30°C or more between Tg1 and Tg2) also represents parameter optimization to achieve both smooth surface and stable bulk density.
Solution Approach 2:
The patent employs composite materials by creating pressure sensitive adhesive particles with a complex internal structure containing two resins with different glass transition temperatures. This composite structure allows the particle to maintain stable bulk density while achieving smooth surface, as the two-resin system provides both structural stability and surface quality.
2Stability of the object's composition
If the surface roughness is increased to improve bulk density stability, then the bulk density becomes stable, but the surface smoothness deteriorates
Solution Approach 1:
The patent resolves this contradiction by precisely controlling the surface roughness parameter within the range of 0.005 μm to 0.100 μm, which is sufficient to ensure bulk density stability while maintaining acceptable surface smoothness. The controlled parameter approach avoids the need for excessive surface roughness.
Solution Approach 2:
The patent applies local quality by differentiating between surface properties and internal structure properties. The surface layer is optimized for smoothness (Ra ≤ 0.100 μm) while the internal structure is designed with dual glass transition temperatures for stability. This local differentiation allows each region to optimize its function without compromising the other.
3Ease of manufacture
If a single resin composition is used to simplify the formulation, then the manufacturing process is simplified, but the adhesiveness and pressure response are insufficient
Solution Approach 1:
The patent uses composite materials by combining two resins with different glass transition temperatures in a specific ratio (first resin: second resin = 9:1 to 1:9 by mass). This composite formulation enhances adhesiveness and pressure response compared to single-resin systems, while the ratio control keeps the manufacturing process manageable.
Solution Approach 2:
The patent applies parameter changes by optimizing the glass transition temperature difference (ΔTg ≥ 30°C) between the two resins. This parameter optimization ensures that the composite material exhibits both excellent adhesiveness and pressure sensitivity, resolving the contradiction between formulation complexity and performance.
4Device complexity
If the glass transition temperature difference between resins is reduced to simplify the composition, then the formulation is simplified, but the pressure-induced phase transition and adhesiveness are reduced
Solution Approach 1:
The patent applies parameter changes by establishing the glass transition temperature difference (ΔTg) as a critical parameter with a minimum value of 30°C. This parameter threshold ensures sufficient pressure-induced phase transition and adhesiveness while maintaining reasonable formulation complexity. The dual-Tg system with controlled ΔTg provides optimal performance without excessive complexity.
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 ensures stable bulk density and enhanced adhesiveness by maintaining consistent surface roughness, allowing for controlled loading and optimal peeling force in printed materials, while the pressure-induced phase transition enhances the adhesive properties.
Implementation Method 1
the pressure sensitive adhesive particle has at least two glass transition temperatures, and a difference between a lowest glass transition temperature and a highest glass transition temperature among the glass transition temperatures is 30° C. or more
Data Source
AI summary
A pressure sensitive adhesive particle includes a pressure sensitive adhesive base particle that contains a styrene resin containing styrene and a vinyl monomer other than styrene as polymerization components, and a (meth)acrylate resin containing at least two (meth)acrylates as polymerization components, in which a mass ratio of the (meth)acrylates relative to a total of polymerization components of the (meth)acrylate resin is 90 mass % or more; and an external additive. The pressure sensitive adhesive particle has a surface having an arithmetic average roughness Ra within a range of 0.005 μm to 0.100 μm. The pressure sensitive adhesive particle has at least two glass transition temperatures, and the difference between the lowest glass transition temperature and the highest glass transition temperature among the glass transition temperatures of the pressure sensitive adhesive particle is 30° C. or more.