Electrostatic Toner Amorphous Crystalline Resin
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Solution Overview
Problem
Conventional electrostatic toners have insufficient low-temperature fusing property, charge property, and durability, particularly when dealing with increased speed in electrophotographic systems.
Innovation Solution
An electrostatic image development toner is developed, containing an amorphous resin with an amorphous polyester resin (A) and a crystalline resin with a crystalline polyester resin (C), where the amorphous resin has a high ester group concentration and the crystalline resin is more hydrophobic, enhancing hydrophobic interaction and dispersibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional toners are used to deal with increased speed in electrophotographic systems, then rapid thermal responsiveness is required, but low-temperature fusing property is insufficient
Solution Approach 1:
The patent uses a composite resin system comprising both amorphous polyester resin and crystalline polyester resin in specific proportions. The amorphous resin provides rapid thermal responsiveness for high-speed processing, while the crystalline resin contributes to low-temperature fusing property. This composite material approach resolves the contradiction between speed requirements and fusing temperature requirements.
Solution Approach 2:
The patent optimizes the molecular weight, functional group content, and compositional ratio of the polyester resins to achieve desired thermal properties. By adjusting parameters such as the carboxyl group content (0.01-0.5 mmol/g) and the ratio of amorphous to crystalline resin, the toner achieves both rapid thermal response and low-temperature fusing capability.
2Reliability
If conventional toners are used for increased speed, then charge property needs improvement, but durability is insufficient
Solution Approach 1:
The patent employs a composite resin system where amorphous polyester resin enhances charge property through its molecular structure and functional groups, while crystalline polyester resin contributes to durability through its stable crystalline structure. The synergistic combination of these two resin types simultaneously improves both charge property and durability.
Solution Approach 2:
The patent controls specific parameters including carboxyl group content (0.01-0.5 mmol/g), hydroxyl group content, and the ratio of amorphous to crystalline resin phases. These parameter optimizations enable the toner to achieve improved charge property while maintaining enhanced durability for high-speed operation.
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 exhibits improved low-temperature fusing property, charge property, and durability due to the favorable hydrophobic interaction between the amorphous and crystalline resins, leading to enhanced thermal responsiveness and image quality.
Implementation Method 1
the crystalline resin is more hydrophobic, enhancing hydrophobic interaction and dispersibility
Data Source
AI summary
An electrostatic image development toner containing an amorphous resin and a crystalline resin as binder resins. The amorphous resin contains an amorphous polyester resin (A) that is a polycondensate of an alcohol component (a) containing 80 mol % or more of an aliphatic diol (a1) and a carboxylic acid component (b), the alcohol component (a) contains 60 mol % or more of an aliphatic diol (a2) having 5 or 6 carbon atoms and having an alkyl group on a side chain, and the crystalline resin contains a crystalline polyester resin (C) that is a polycondensate of an aliphatic alcohol (c) and a carboxylic acid component (d).