Composite Resin Toner for Low-Temperature Fixing and Charge Control
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Solution Overview
Problem
Existing toners face challenges in achieving both low-temperature fixability and heat-resistant storage stability, leading to issues such as poor paper discharge adhesiveness in high-temperature, high-humidity environments and charge-up in low-temperature, low-humidity environments, resulting in image defects like fogging.
Innovation Solution
A toner composition comprising a resin A with a specific structure and a resin B containing a monomer unit, which enhances spatial arrangement and molecular constraints to improve fixability and adhesiveness, while suppressing charge-up through spatial proximity and charge transmission between the resins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If side-chain crystalline resins with melting points of 50.0°C to 90.0°C are used for the binder resin, then low-temperature fixability is improved, but paper discharge adhesiveness deteriorates in high-temperature, high-humidity environments
Solution Approach 1:
The invention uses a composite resin system comprising a crystalline resin component (for low-temperature fixability) and an amorphous resin component containing carboxyl groups (for paper discharge adhesiveness and charge control). This composite structure allows the toner to simultaneously achieve low-temperature fixability through the crystalline resin's melting behavior and reliable paper discharge adhesiveness through the amorphous resin's charge transmission properties, even in high-temperature, high-humidity environments.
Solution Approach 2:
The invention modifies the chemical and physical parameters of the binder resin by introducing carboxyl-containing amorphous resin components with specific glass transition temperatures and carboxyl group contents. This parameter adjustment allows the toner to maintain optimal charge transmission and paper discharge adhesiveness while preserving the low-temperature fixability provided by the crystalline resin component.
2Reliability
If side-chain crystalline resins with melting points of 50.0°C to 90.0°C are used for the binder resin, then heat-resistant storage stability is improved, but charge-up occurs in low-temperature, low-humidity environments
Solution Approach 1:
The composite resin system combines the heat-resistant storage stability of crystalline resins with the charge control capabilities of amorphous resins containing carboxyl groups. The amorphous resin component acts as a charge transmission medium that prevents charge-up in low-temperature, low-humidity environments while preserving the thermal stability of the crystalline component during storage.
Solution Approach 2:
The amorphous resin containing carboxyl groups serves as an intermediary substance that facilitates charge transmission between the crystalline resin particles and the substrate. This intermediary component prevents charge accumulation by providing a conductive pathway, thereby eliminating the charge-up problem in low-temperature, low-humidity environments while maintaining heat-resistant storage stability.
3Temperature
If side-chain crystalline resins with melting points of 50.0°C to 90.0°C are used for the binder resin, then low-temperature fixability is improved, but image quality deteriorates due to fogging
Solution Approach 1:
The composite resin system combines crystalline and amorphous resin components to achieve both low-temperature fixability and high image quality. The amorphous resin component with carboxyl groups prevents charge-up and fogging by providing effective charge transmission, while the crystalline component enables low-temperature fixing, thereby producing high-quality images without defects.
Solution Approach 2:
The amorphous resin containing carboxyl groups acts as a mediator that ensures proper charge transmission during the imaging process. This prevents charge-up and subsequent fogging that would otherwise occur with pure crystalline resins, thereby maintaining image quality while preserving the low-temperature fixability advantage.
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 achieves excellent low-temperature fixability, heat-resistant storage stability, and improved paper discharge adhesiveness in high-temperature, high-humidity environments, while reducing image defects like fogging in low-temperature, low-humidity conditions.
Implementation Method 1
spatial arrangement and molecular constraints to improve fixability and adhesiveness, while suppressing charge-up through spatial proximity and charge transmission between the resins
Data Source
AI summary
A toner comprises a toner particle comprising a resin A and a resin B, wherein the resin A has a structure represented by a predetermined general formula, and the resin B has a monomer unit represented by a predetermined general formula, and a toner manufacturing method comprises a step of dispersing a toner base particle comprising the resin B in an aqueous medium to obtain a toner slurry, and a step of adding a radical polymerization initiator and a monomer composition comprising a monomer represented by a predetermined general formula to the resulting toner slurry to form the resin A on a surface of the toner base particle.