Pressure-Responsive Particle Set for Stronger Printed Media Bonding
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Solution Overview
Problem
Existing particle sets for producing printed matter do not achieve optimal adhesiveness when used in electrophotographic image forming apparatuses, particularly due to the mismatch in particle diameters and glass transition temperatures of toner and pressure-responsive particles, leading to reduced pressure application on the pressure-responsive particles during bonding.
Innovation Solution
A particle set comprising chromatic color toner and pressure-responsive particles with specific mass ratios of styrene to (meth)acrylate resins and controlled glass transition temperature differences, along with defined particle diameter relationships, to enhance adhesiveness by ensuring the pressure-responsive particles maintain a thicker layer than the toner layer, thereby maintaining effective pressure application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the volume average particle diameter of toner particles and base particles satisfy D50B−D50A≤1.5 μm, then the particle size difference is reduced, but the adhesiveness of the printed matter deteriorates
Solution Approach 1:
The invention changes the particle diameter parameter by establishing a specific relationship between toner particles and base particles (D50B−D50A>1.5 μm), ensuring that pressure-responsive particles are significantly larger than toner particles. This parameter change optimizes the layer thickness relationship, allowing pressure-responsive particles to form a thicker layer that maintains effective pressure application during bonding, thereby improving adhesiveness.
Solution Approach 2:
The invention shifts the focus from horizontal particle size matching to vertical layer thickness differentiation. By controlling the particle diameter difference, the pressure-responsive particle layer naturally forms a thicker layer compared to the toner layer, creating a dimensional advantage in the vertical direction that ensures sufficient pressure transmission during bonding.
2Measurement precision
If the glass transition temperature difference of pressure-responsive particles is reduced, then the temperature control precision is improved, but the pressure application effectiveness deteriorates
Solution Approach 1:
The invention optimizes the glass transition temperature parameter by specifying that the difference between the highest and lowest glass transition temperatures of pressure-responsive particles should be 30°C or more. This parameter setting ensures that the pressure-responsive particles undergo effective phase transition under pressure, maintaining their pressure-responsive properties and enabling effective pressure application during bonding.
3Adaptability or versatility
If the mass ratio of styrene resin to (meth)acrylate resin is outside the 80:20 to 20:80 range, then the resin composition flexibility is increased, but the adhesiveness of printed matter deteriorates
Solution Approach 1:
The invention optimizes the compositional parameter by specifying that the mass ratio of styrene resin to (meth)acrylate resin in base particles should be 80:20 to 20:80. This parameter range balances the properties of both resins: styrene resin provides structural stability while (meth)acrylate resin enhances adhesiveness. This balanced composition ensures that pressure-responsive particles maintain both mechanical integrity and bonding strength, thereby improving the overall adhesiveness of printed matter.
Solution Approach 2:
The invention uses a composite resin system combining styrene resin and (meth)acrylate resin in specific proportions. This composite material approach leverages the complementary properties of both resins: the rigidity and stability of styrene resin combined with the adhesive properties of (meth)acrylate resin, creating a synergistic effect that optimizes both structural performance and bonding strength.
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 results in printed matters with improved adhesiveness by ensuring the pressure-responsive particles remain distinct and effectively transition under pressure, enhancing the bonding strength between stacked recording media.
Implementation Method 1
pressure-responsive particles having a pressure-induced phase transition property
Implementation Method 2
the difference between the lowest glass transition temperature and the highest glass transition temperature of the pressure-responsive particles is 30° C. or more
Data Source
AI summary
A particle set for producing a printed matter includes: a chromatic color toner containing toner particles A; and pressure-responsive particles containing base particles B, in which the base particles B contain a styrene resin containing, as polymerization components, styrene and a vinyl monomer other than styrene, and a (meth)acrylate resin containing, as a polymerization component, a (meth)acrylate, a mass ratio of the styrene resin to the (meth)acrylate resin (styrene resin:(meth)acrylate resin) is 80:20 to 20:80, a difference between the lowest glass transition temperature and the highest glass transition temperature of the pressure-responsive particles is 30° C. or more, and when the toner particles A have a volume average particle diameter D50A and the base particles B have a volume average particle diameter D50B, the D50A and the D50B satisfy formula 1-1: 1.5 μm<(D50B−D50A).