Polymeric Charge Control Agent for Toner
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Solution Overview
Problem
Conventional charge control agents in electrophotography fail to provide the desired high-speed and high-image-quality charging characteristics, leading to issues like 'fog' and streaky density non-uniformity due to toner particles being charged with reverse polarity.
Innovation Solution
A novel polymerizable monomer represented by a specific general formula is polymerized to produce a polymeric compound with improved charge-providing properties, which is incorporated into the developer bearing member and toner to enhance charging performance and reduce reverse polarity charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional charge control agents (metal complexes of monoazo dyes, salicylic acid, alkylsalicylic acids, or benzilic acid) are used, then charge control function is provided, but charging rise speed is slow and saturated charge quantity is insufficient
Solution Approach 1:
The patent changes the chemical structure parameters of the charge control agent by introducing a polymeric compound with specific functional groups (carboxyl, hydroxyl, or amino groups) and controlled molecular weight (100-10,000), thereby improving charging rise speed and saturated charge quantity while maintaining reliable charge control function
Solution Approach 2:
The patent uses composite materials by combining polymeric compounds with specific functional groups (carboxyl, hydroxyl, or amino groups) to create a charge control agent that integrates multiple properties: polymer chain flexibility for charge transport, functional groups for charge generation, and controlled molecular weight for optimal performance
2Reliability
If conventional charge control agents are used, then charge control is achieved, but image quality deteriorates due to fog and streaky density non-uniformity
Solution Approach 1:
The patent changes the molecular weight parameter to 100-10,000 and introduces specific functional groups (carboxyl, hydroxyl, or amino groups) that enable precise charge control, thereby eliminating fog and streaky density non-uniformity while maintaining reliable charge control for high image quality
3Productivity
If conventional charge control agents are used, then development can proceed, but reverse polarity charging occurs causing fog at blank areas
Solution Approach 1:
The patent changes the chemical structure by introducing polymeric compounds with specific functional groups (carboxyl, hydroxyl, or amino groups) and controlled molecular weight, which provide strong enough charge control to prevent reverse polarity charging and eliminate fog at blank areas while maintaining development capability
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 polymeric compound achieves superior charge-providing performance, high charging rise speed, and saturated charge quantity, while minimizing toner particles with reverse polarity, resulting in improved image quality and reduced fog.
Implementation Method 1
a resin having charge control function... improved in its uniformity of triboelectric charging
Implementation Method 2
a developer charged electrostatically... flies to the surface of a photosensitive drum by electrostatic force which accords with potential differences on the drum surface
Data Source
AI summary
To provide a polymeric compound having superior charge-providing properties, the polymeric compound contains at least one unit represented by the following general formula (5).In the general formula (5), R1 represents a hydrogen atom or an alkyl group; R2 to R4 each represent a hydrogen atom, an alkyl group, an alkoxy group, a hydroxyl group or a halogen atom, or R3 and R4 may combine each other to form a ring; and A represents a divalent linking group.