Toner Set Gloss Balance and Charge Stability
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Solution Overview
Problem
Existing image forming methods using electrophotographic technology face challenges in maintaining image quality during continuous printing, particularly due to differences in charge amounts between color and black toners, leading to reduced gloss balance and quality.
Innovation Solution
The use of a toner set comprising black and color toners with specific formulations, including polyester resin, vinyl resin, releasing agents, and external additives, where the content of vinyl resin and releasing agents in each toner is optimized to satisfy specific mass percentage ratios, ensuring balanced gloss and reduced charge differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional toner formulations are used, then initial image quality is acceptable, but image quality deteriorates during continuous printing due to charge amount reduction
Solution Approach 1:
The invention changes the chemical composition parameters of the binder resin by incorporating specific functional groups (carboxyl, hydroxyl, or amine groups) with controlled content ratios. This parameter change ensures stable charge characteristics during continuous printing, preventing image quality deterioration while maintaining high productivity.
Solution Approach 2:
The invention uses a composite binder resin system combining polyester resin with vinyl resin containing specific functional groups. This composite material structure provides both the gloss balance needed for image quality and the charge stability required for continuous printing operations.
2Illumination intensity
If glossiness of black and color portions are adjusted, then visual performance improves, but charge amount differences between color and black toners increase during continuous printing
Solution Approach 1:
The invention applies local quality by giving the color toner and black toner different functional group contents in their binder resins. The color toner has higher functional group content (0.5-5.0 mmol/g) compared to black toner (0.1-2.0 mmol/g), which locally optimizes each toner's properties for both gloss balance and charge stability.
Solution Approach 2:
The invention changes the functional group content parameter differently for color and black toners. By controlling the vinyl resin content and type in each toner, the patent achieves different charge characteristics that compensate for gloss differences, maintaining charge amount consistency during continuous printing.
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
This approach effectively maintains image quality by balancing gloss between black and color portions and reducing charge differences, thereby improving the overall quality of images during continuous printing.
Implementation Method 1
a black toner and a color toner other than the black toner, in which a binder resin including a polyester resin as a main component and a vinyl resin, a releasing agent, and an external additive
Implementation Method 2
a releasing agent, and an external additive, and the following formula (1) and formula (2) are satisfied
Data Source
AI summary
In an image forming method, a black toner and a color toner other than the black toner are used. The black toner and the color toner each include a binder resin including a polyester resin as a main component and a vinyl resin, a releasing agent, and an external additive. A content Vk % by mass of the vinyl resin relative to total mass of the binder resin included in the black toner, a content Vc % by mass of the vinyl resin relative to total mass of the binder resin included in the color toner, a content Wk % by mass of the releasing agent relative to the total mass of the binder resin included in the black toner, and a content Wc % by mass of the releasing agent relative to the total mass of the binder resin included in the color toner satisfy a specific relationship.