Liquid Developer Set Viscosity Control via Hydrocarbon Resin
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Solution Overview
Problem
The use of liquid developers in image forming apparatuses faces challenges due to differences in viscosity between black and colored developers, leading to inconsistent image formation, as the high content of coloring agents like carbon black distorts toner particles and increases viscosity, affecting the state of thin layers on rollers and transportation of developers.
Innovation Solution
A liquid developer set comprising a first developer with carbon black and a second developer without carbon black, both including hydrocarbon long chains in their resins, with a higher mass ratio of hydrocarbon long chain to toner particles in the first developer to reduce viscosity differences and enhance affinity with the insulating liquid, thereby maintaining consistent image formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the content of coloring agent in toner particles is increased to achieve high-density black image, then image density is improved, but the shape of toner particles becomes distorted and viscosity of liquid developer increases
Solution Approach 1:
The invention changes the chemical composition parameters of the resin by incorporating specific functional groups (carboxyl, hydroxyl, or amine groups) with controlled content ratios. This parameter change modifies the resin's interaction with coloring agents, preventing particle shape distortion while maintaining high image density through optimized chemical properties rather than relying solely on increased coloring agent content.
Solution Approach 2:
The invention uses composite resin structures combining multiple polymer components with specific functional groups. This composite approach allows the resin to simultaneously provide structural support for spherical particle shape and chemical functionality for high coloring agent compatibility, resolving the contradiction between image density and particle shape maintenance.
2Illumination intensity
If the content of coloring agent in toner particles is increased to achieve high-density black image, then image density is improved, but the viscosity of liquid developer increases
Solution Approach 1:
The invention modifies the resin's physical and chemical parameters by incorporating functional groups with specific content ratios. This changes the resin's surface properties and interaction characteristics, reducing excessive adhesion between toner particles and preventing viscosity increase even when coloring agent content is high for achieving dense black images.
Solution Approach 2:
The functionalized resin acts as an intermediary between the coloring agent and the insulating liquid. It mediates the interaction by providing controlled surface properties that prevent aggregation and maintain appropriate viscosity levels, allowing high coloring agent content without compromising liquid developer flow characteristics.
3Adaptability or versatility
If different liquid developers (black and colored) are used in an image forming apparatus, then color image formation is enabled, but differences in viscosity cause inconsistent image formation
Solution Approach 1:
The invention creates a universal resin formulation that can be used across different liquid developer types (black and colored). By incorporating functional groups that provide consistent interaction mechanisms, the resin ensures uniform viscosity characteristics and performance across all developer types, enabling color image formation without compromising consistency.
Solution Approach 2:
The invention standardizes key resin parameters (functional group content, molecular weight, composition ratios) to maintain consistent viscosity across different liquid developers. This parameter control ensures that black and colored developers exhibit matched flow and transport characteristics, enabling reliable color image formation in multi-developer systems.
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 solution effectively reduces viscosity differences between black and colored developers, ensuring consistent image quality and efficient operation in image forming apparatuses by adjusting the mass ratio of hydrocarbon long chains in the resins, preventing increased viscosity and maintaining electrical insulation efficiency.
Implementation Method 1
both including hydrocarbon long chains in their resins, with a higher mass ratio of hydrocarbon long chain to toner particles in the first developer to reduce viscosity differences and enhance affinity with the insulating liquid
Data Source
AI summary
A liquid developer set of the present invention includes a first liquid developer including an insulating liquid and first toner particles and a second liquid developer including an insulating liquid and second toner particles, the first toner particles include carbon black and a first resin, the second toner particles include a coloring agent other than carbon black and a second resin, without including carbon black, the first resin and the second resin each include a hydrocarbon long chain which is a hydrocarbon group having a carbon number of 8 to 30, and a mass ratio of the hydrocarbon long chain to the first toner particles is higher than a mass ratio of the hydrocarbon long chain to the second toner particles.