Developer With Fatty Acid Ester Insulating Liquid for Positive Charging
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Solution Overview
Problem
Conventional developers with resin materials face challenges in achieving positive charging characteristics and charge stability, especially when using polyester resin toner particles, which are difficult to charge positively and require charge control agents to achieve adequate charging.
Innovation Solution
A developer comprising toner particles and an insulating liquid with a fatty acid ester, where substance A or substance B is added in specific quantities, allowing for excellent positive charging characteristics and charge stability, enabling high-speed developing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If resin materials (epoxy resins, polyester resins, styrene-acrylic ester copolymers) are used for toner particles, then ease of handling and good color expression are achieved, but positive charging characteristics and charge stability deteriorate
Solution Approach 1:
A cationic charge control agent is introduced as an intermediary substance that mediates between the negatively charged resin toner particles and the positive charge requirement. This agent transfers positive charge to the toner particles, enabling them to achieve the necessary positive charging characteristics while maintaining the benefits of using resin materials for ease of handling and color expression.
Solution Approach 2:
The charge state parameter of the toner particles is changed from negative to positive by adding the cationic charge control agent. This parameter change allows the toner particles to achieve adequate positive charge while maintaining their resin material composition, thereby resolving the contradiction between ease of handling and charge stability.
2Reliability
If charge control agents are added to toner particles to make charge positive, then positive charging characteristics improve, but the amount of charge achieved deteriorates (insufficient charge)
Solution Approach 1:
The toner particles are formulated as a composite material combining resin material (for ease of handling and color expression) with a cationic charge control agent (for positive charging). This composite structure enables simultaneous achievement of adequate positive charge amount and good handling characteristics, resolving the contradiction between charging characteristics and charge quantity.
3Ease of manufacture
If conventional developers are used, then manufacturing simplicity is maintained, but productivity (high-speed developing compatibility) deteriorates
Solution Approach 1:
The cationic charge control agent in the toner particles provides self-charging capability, eliminating the need for complex external charging mechanisms. This self-service approach maintains manufacturing simplicity while enabling high-speed developing compatibility, as the toner particles inherently possess the necessary positive charge for efficient development at high speeds.
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 developer achieves excellent positive charging characteristics, charge stability, and mobility of toner particles, making it suitable for high-speed developing while maintaining dispersion and storage stability.
Implementation Method 1
a fatty acid ester is contained as the insulating liquid, a substance A expressed by the following formula (1) and/or a substance B expressed by the following formula (2) is further contained, and the total percentage in which substance A and substance B are contained is at least 0.1 wt % and no more than 3.0 wt %. Consequently, a developer can be provided that has excellent positive charging characteristics and charge stability
Implementation Method 2
a developer in which a toner made up of a material containing a pigment or other such colorant and a binder resin is dispersed in an electrically insulating carrier liquid (insulating liquid)
Data Source
AI summary
There is provided a developer that has excellent positive charging characteristics and charging stability, and which is compatible with high-speed developing. The developer of the invention contains toner particles and an insulating liquid, wherein a fatty acid ester is contained as the insulating liquid, a substance A expressed by the following formula (1) and/or a substance B expressed by the following formula (2) is further contained, and the total percentage in which substance A and substance B are contained is at least 0.1 wt % and no more than 3.0 wt %.