Electrostatic Toner with Amorphous-Crystalline Resin for Foil Adhesion
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Solution Overview
Problem
Existing electrostatic charge image developing toners often experience transfer failure during foil stamping due to the permeation of the toner into the recording medium, especially when using crystalline resins that melt rapidly under heat, leading to poor adhesion of foils.
Innovation Solution
The development of an electrostatic charge image developing toner containing a binder resin with both amorphous and crystalline components, where the toner particles have a complex viscosity that softens at 50°C or lower, allowing resin particles to form a network structure and prevent permeation into the recording medium.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If crystalline resins are used in the toner, then the toner can provide good adhesion and image quality, but the crystalline resins melt rapidly under heat causing toner permeation into the recording medium and transfer failure during foil stamping
Solution Approach 1:
The patent uses a composite binder resin system combining amorphous resin (provides viscosity control and network formation) and crystalline resin (provides adhesion) in specific ratios. This composite approach allows the toner to maintain adhesion quality while suppressing excessive melting and permeation during foil stamping operations.
Solution Approach 2:
The patent precisely controls the complex viscosity parameter of the toner particles at the measurement temperature, ensuring it falls within a specific range. This parameter control prevents the toner from becoming too soft and permeating into the recording medium, while still maintaining sufficient adhesion properties for foil stamping.
2Reliability
If the toner softens at lower temperature to improve adhesion, then foil attachment is enhanced, but the toner may permeate into the recording medium causing transfer failure
Solution Approach 1:
The amorphous resin acts as an intermediary component that forms a three-dimensional network structure, mediating between the crystalline resin's adhesion function and the need to prevent permeation. This network structure provides a framework that allows controlled softening for adhesion while preventing uncontrolled permeation.
Solution Approach 2:
The patent creates different functional zones within the toner particle structure through the binder resin composition. The amorphous resin network provides localized structural integrity to prevent permeation, while the crystalline resin provides localized adhesion properties, achieving both functions simultaneously in different regions of the toner system.
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 toner effectively suppresses transfer failure of foils during foil stamping by ensuring the resin particles form a network structure that enhances adhesion, preventing toner permeation and ensuring reliable foil attachment.
Implementation Method 1
a temperature T0 at which a complex viscosity η* of the toner particles is 1.0×107 Pa·s is 50° C. or lower
Implementation Method 2
in a case where dynamic viscoelasticity of the toner particles is measured, a temperature T0 at which a complex viscosity η* of the toner particles is 1.0×107 Pa·s is 50° C. or lower
Data Source
AI summary
An electrostatic charge image developing toner contains toner particles that contain a binder resin containing an amorphous resin and a crystalline resin and resin particles, in which the electrostatic charge image developing toner satisfies the following Condition (1) and Condition (2). Condition (1): in a case where dynamic viscoelasticity of the toner particles is measured, a temperature T0 at which a complex viscosity η* of the toner particles is 1.0×107 Pa·s is 50° C. or lower, Condition (2): in a case where dynamic viscoelasticity of the resin particles is measured, a complex viscosity η* of the resin particles at the temperature T0 is 1.0×104 Pa·s or more, and ΔA calculated by the following Equation (1) is 0.2 or more. Equation (1): ΔA=|Logη*(T0+5)−Logη*(T0−5)|, in Equation (1), η*(T0+5) is a complex viscosity (unit: Pa·s) at a temperature 5° C. higher than the temperature T0, and η*(T0−5) is a complex viscosity (unit: Pa·s) at a temperature 5° C. lower than the temperature T0.