Toner Production via Segmented Charge Control Resin
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Solution Overview
Problem
Existing toner production methods face challenges in achieving excellent triboelectric chargeability and high-temperature offset resistance, particularly when using negatively chargeable charge control resins that do not soften at 180°C, as they tend to have poor dispersibility and viscoelastic properties, leading to reduced triboelectric charges and offset resistance.
Innovation Solution
A method involving the pulverization of negatively chargeable charge control resins to an average particle size of 0.05 to 2 μm, followed by melt-kneading with a resin binder and colorant, and subsequent classification to enhance dispersibility and triboelectric properties, thereby improving triboelectric chargeability and high-temperature offset resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If negatively chargeable charge control resins that do not soften at 180°C or lower are used, then high-temperature offset resistance is improved, but dispersibility deteriorates leading to poor triboelectric chargeability
Solution Approach 1:
The charge control resin is divided into fine particles with an average particle size of 0.05 to 2 μm through pulverization. This segmentation allows the resin to disperse more uniformly in the toner composition while maintaining its high softening point, thereby achieving both good dispersibility and high-temperature offset resistance
Solution Approach 2:
The particle size parameter of the charge control resin is changed from larger conventional sizes to the specific range of 0.05 to 2 μm. This parameter change improves dispersibility without altering the chemical composition or softening point, resolving the contradiction between temperature resistance and dispersibility
2Stability of the object's composition
If charge control resin particle size is reduced to improve dispersibility, then triboelectric chargeability is improved, but manufacturing complexity increases
Solution Approach 1:
The charge control resin is pulverized to the desired particle size before being mixed with other toner components. This preliminary action ensures uniform dispersibility in the final product while using a simple pulverization process that does not require complex manufacturing equipment
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 method results in a toner with enhanced triboelectric chargeability and high-temperature offset resistance by ensuring better dispersibility of the charge control resin within the resin binder, maintaining viscoelastic properties, and improving the overall performance of the toner.
Implementation Method 1
melt-kneading at least a pulverized product of the negatively chargeable charge control resin obtained in the step (A), a resin binder, and a colorant
Implementation Method 2
pulverizing a negatively chargeable charge control resin that does not soften at a temperature of 180° C. or lower to an average particle size of from 0.05 to 2 μm
Implementation Method 3
negatively chargeable charge control resin... giving electric charges to toners... excellent triboelectric chargeability
Data Source
AI summary
A method for producing a toner, including at least the following steps: step (A): pulverizing a negatively chargeable charge control resin that does not soften at a temperature of 180° C. or lower to an average particle size of from 0.05 to 2 μm; step (B): melt-kneading at least a pulverized product of the negatively chargeable charge control resin obtained in the step (A), a resin binder, and a colorant; and step (C): pulverizing a melt-kneaded product obtained in the step (B) and classifying the pulverized product. The toner obtained according to the present invention is suitably used in, for example, the development of a latent image formed in electrophotography, electrostatic recording method, electrostatic printing method or the like.