Toner Formulation with Composite Additives for Fluidity and Adhesion
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Solution Overview
Problem
Conventional toners face challenges in maintaining stable image density and preventing pollution when filled to capacity for extended periods, due to decreased fluidity and weak adhesion of external additives, leading to increased physical load and pollution of electrophotographic process components.
Innovation Solution
A toner formulation incorporating organic-inorganic composite fine particles with specific size, shape, and adhesion properties, along with inorganic fine particles, is used, which are strategically added in two stages to enhance adhesion and prevent detachment, maintaining fluidity and reducing pollution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the filling amount of toner is increased to enhance convenience and cost advantages, then the usage period is extended, but the physical load on toner increases causing decreased fluidity and increased pollution
Solution Approach 1:
The patent uses composite external additives combining organic fine particles and inorganic fine particles. The organic particles provide adhesion to toner surface while inorganic particles maintain fluidity, creating a synergistic effect that resolves the contradiction between extended usage and reduced physical load damage.
Solution Approach 2:
The patent specifies precise particle diameter ranges (organic: 0.01-0.5 μm, inorganic: 0.03-0.8 μm) and surface area ratios to optimize the balance between adhesion and fluidity. By controlling these parameters, the toner can withstand extended usage periods while maintaining adequate fluidity under increased physical load.
2Ease of operation
If external additives with small particle diameter are used to improve fluidity, then fluidity is enhanced, but the additives are easily embedded in toner surface causing decreased fluidity over time
Solution Approach 1:
The patent combines organic fine particles (0.01-0.5 μm) that provide initial fluidity enhancement with inorganic fine particles (0.03-0.8 μm) that resist embedding. This composite structure allows the toner to maintain fluidity without the external additives being easily embedded during extended agitation.
Solution Approach 2:
The patent differentiates the properties of organic and inorganic external additives, assigning fluidity enhancement primarily to organic particles and embedding resistance to inorganic particles. This local differentiation of functions within the external additive system resolves the contradiction between initial fluidity and long-term stability.
3Stability of the object's composition
If external additives with large particle diameter are used to resist embedding, then embedding resistance is improved, but adhesion to toner surface becomes weak causing pollution of electrophotographic members
Solution Approach 1:
The patent creates a composite external additive system where inorganic fine particles (0.03-0.8 μm) provide embedding resistance while organic fine particles (0.01-0.5 μm) provide strong adhesion to toner surface. This composite approach ensures that external additives neither embed nor detach, preventing pollution of electrophotographic members.
Solution Approach 2:
The patent optimizes the particle diameter and surface area ratio parameters of external additives to achieve the right balance. By controlling the inorganic particle surface area to be 30-80% of total external additive surface area, the system achieves both strong adhesion and embedding resistance, eliminating pollution.
4Strength
If treatment time is extended to achieve stronger adhesion of external additives, then adhesion is improved, but external additives are swept into recesses preventing sufficient covering effect
Solution Approach 1:
The patent uses a composite external additive system where the combination of organic and inorganic particles achieves strong adhesion without requiring extended treatment time. The inorganic particles fill surface recesses while organic particles provide adhesion, achieving both strong bonding and uniform covering effect simultaneously.
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 ensures stable image density and reduced pollution by maintaining the adhesion and fluidity of toners even under high physical loads, allowing for long-term use without compromising image quality.
Implementation Method 1
The external additives with a large particle diameter, however, has weak physical/electrostatic adhesion to the toner surface due to the size
Implementation Method 2
The external additives with a large particle diameter, however, has weak physical/electrostatic adhesion to the toner surface due to the size
Implementation Method 3
the inorganic fine particle A has a BET specific surface area of 50 m2/g or more and 400 m2/g or less
Data Source
AI summary
To provide a toner from which an image having a stable image density can be obtained with reduced occurrence of pollution of members, even when a toner container is filled with a larger amount of toner than a conventional amount for long-term use. A toner including a toner particle and an external additive containing an organic-inorganic composite fine particle and an inorganic fine particle A; wherein the organic-inorganic composite fine particle includes a resin particle and an inorganic fine particle B, the resin particle has a surface with a convex derived from the inorganic fine particle B; has a specific number average particle diameter (D1) and a specific shape factor SF-2; and has a specific fixed state to the toner particle; the organic-inorganic composite fine particle has a specific unit diffusion index on the toner particle surface; the inorganic fine particle A has a specific BET specific surface area.