Electrophotographic Toner with Composite Releasing Agents
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Solution Overview
Problem
Low-temperature fixing in electrophotographic processes often results in banded or streaked image defects due to the low-melting releasing agents used, which cause adhesion and vaporization issues within the device, leading to uneven charging and mirror staining.
Innovation Solution
A toner formulation incorporating a combination of straight chain and branched hydrocarbon compounds as releasing agents, with the branched component accounting for 5-90% of the total, to inhibit the production of volatile components and maintain sufficient releasing capability at low temperatures, preventing image defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a low-melting releasing agent is used to achieve low-temperature fixing, then the fixing temperature is reduced, but banded or streaked image defects occur due to vaporization of the releasing agent
Solution Approach 1:
The releasing agent is formulated as a composite mixture of multiple hydrocarbon compounds with different molecular weights and structures (straight-chain and branched-chain isomers). This composite structure allows the releasing agent to maintain low melting point for low-temperature fixing while the diverse composition suppresses vaporization and prevents image defects.
Solution Approach 2:
The invention changes the chemical composition parameters of the releasing agent by specifying particular ratios of straight-chain to branched-chain hydrocarbons. This parameter optimization enables the releasing agent to exhibit both low melting point (for low-temperature fixing) and low vapor pressure (to prevent vaporization and image defects) simultaneously.
2Loss of energy
If the melting point of the releasing agent is lowered to achieve low-temperature fixing, then energy consumption is reduced, but the releasing agent produces vaporized components that adhere to device components
Solution Approach 1:
The releasing agent uses a composite formulation of hydrocarbon compounds with varying chain structures. The presence of branched-chain isomers alongside straight-chain isomers creates a mixture that reduces overall vapor pressure while maintaining low melting point, thereby preventing energy loss and avoiding vaporization-related harm to device components.
Solution Approach 2:
The invention converts the potential harm of low-melting-point compounds (which tend to vaporize) into a benefit by carefully selecting branched-chain hydrocarbons. These branched structures inherently have lower vapor pressure despite low melting points, thus the same low-temperature condition that could cause vaporization is instead used to achieve effective releasing without harmful vapor emission.
3Temperature
If a low-melting releasing agent is used, then low-temperature fixing is enabled, but uneven charging occurs due to adhesion of releasing agent molecules to device interior
Solution Approach 1:
The chemical composition parameters of the releasing agent are precisely controlled to optimize the balance between melting point and vapor pressure. By adjusting the ratio of straight-chain to branched-chain hydrocarbons and selecting specific molecular weight ranges, the releasing agent achieves low melting point for low-temperature fixing while maintaining sufficient volatility resistance to prevent adhesion and ensure uniform charging.
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 toner achieves superior image quality by preventing banded or streaked defects and ensuring strong fixing strength at low temperatures, resulting in high-quality fixed images without image defects.
Implementation Method 1
it is necessary to melt a toner and a mold releasing agent (hereinafter, also denoted as a releasing agent) at a relatively low fixing temperature
Implementation Method 2
the low-melting releasing agent which contained easily vaporizable components generated vaporized components at a temperature in the interior of the device and the vaporized components were attached to the wire of a charger
Data Source
AI summary
An electrophotographic toner is disclosed, comprising a binding resin, a colorant and a releasing agent, wherein the releasing agent comprises a first releasing agent component and a second releasing agent component, the first releasing agent component is a straight chain hydrocarbon compound exhibiting a melting point of 50 to 100° C. and the second releasing agent component is a branched hydrocarbon compound exhibiting a melting point of 50 to 100° C., and the second releasing agent component accounting for 5% to 90% by mass of the total amount of the first and second releasing agent components.