Magenta Toner Composition for Peel-Resistant Full-Color Fixing
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Solution Overview
Problem
Conventional toner sets used in full-color image formation are prone to toner layer peeling and generate ultrafine particles during fixation, which affects image quality and durability.
Innovation Solution
A toner set comprising yellow, magenta, and cyan toners with specific loss tangents and containing ester waxes and copolymers with quaternary ammonium groups, along with quinacridone and azo-based pigments, to enhance layer adhesion and reduce particle formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional toner sets are used for full-color image formation, then the image formation process can be completed, but toner layer peeling occurs and ultrafine particles are generated
Solution Approach 1:
The patent changes the molecular weight parameter of the ester wax softening agent to a specific range (600-3000) to optimize the viscoelasticity of the toner. This parameter change improves toner layer adhesion and reduces ultrafine particle generation during fixation, resolving the contradiction between reliable toner layer formation and harmful particle generation.
Solution Approach 2:
The patent uses a composite charge control agent system comprising both polymeric and non-polymeric charge control agents with specific functional groups. This composite material approach enhances toner layer cohesion and reduces particle generation, addressing the contradiction between toner layer reliability and ultrafine particle suppression.
2Reliability
If the molecular weight of ester wax is increased to improve layer adhesion, then toner layer peeling is suppressed, but fixability may deteriorate
Solution Approach 1:
The patent optimizes the molecular weight parameter of ester wax to a balanced range (600-3000) that simultaneously achieves good layer adhesion and maintainable fixability. This parameter optimization resolves the contradiction between improved toner layer adhesion and acceptable fixation temperature characteristics.
3Ease of operation
If loss tangent is increased to improve toner flowability, then toner distribution is improved, but toner adhesion may be reduced
Solution Approach 1:
The patent optimizes the loss tangent parameter within a specific range (0.65-1.05) to achieve a balance between toner flowability and adhesion. This parameter control resolves the contradiction between ease of toner operation and reliable toner adhesion in the developed image.
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 set suppresses toner layer peeling and ultrafine particle generation, ensuring high image density and durability in full-color images.
Implementation Method 1
a loss tangent of the yellow toner at 100°C (tanδ (Y, 100°C)), a loss tangent of the magenta toner at 100°C (tanδ (M, 100°C)) and a loss tangent of the cyan toner at 100°C (tanδ (C, 100°C)), each of which is specified from a temperature dependence curve of the loss tangent (tanδ) of the toner obtained by dynamic viscoelasticity measurement
Implementation Method 2
the magenta toner comprises, as the charge control agent, copolymers A and B each comprising a functional group-containing monomer unit; a content of the functional group-containing monomer unit in the copolymer A is larger than a content of the functional group-containing monomer unit in the copolymer B; and the functional group contained in the copolymer A and the functional group contained in the copolymer B are the same and are quaternary ammonium groups or quaternary ammonium salt-containing groups
Implementation Method 3
The transferred toner image is fixed by heating or the like, thereby obtaining a copy
Implementation Method 4
the electrostatic latent image is developed with a toner to form a toner image; the toner image is transferred onto a recording medium such as print paper directly or through a transfer medium; and the transferred toner image is fixed by heating or the like
Data Source
Figure 1
AI summary
A toner set which is configured to suppress peeling of the toner layer(s) of a full-color image thus formed and which is less likely to produce ultrafine particles during toner fixation. A toner set comprising color toners comprising at least a yellow toner, a magenta toner and a cyan toner, wherein each of the yellow, magenta and cyan toners comprises, as the softening agent, an ester wax having a molecular weight of from 600 to 3000, and wherein a loss tangent of the yellow toner at 100°C, a loss tangent of the magenta toner at 100°C and a loss tangent of the cyan toner at 100°C are all 0.840 or more, and the absolute values of the differences between the loss tangents of the toners at 100°C are all 0.140 or less.