Polymerized Toner Ester Release Agent Leakage
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Solution Overview
Problem
Existing polymerized toners used in high-speed image-forming devices often leak from developing cartridges due to their spherical form and low-temperature fixing requirements, leading to issues like spoiled prints and toner smudging.
Innovation Solution
A polymerized toner is developed using an ester compound with a specific endothermic peak temperature range and a controlled melt index, which reduces leakage by preventing adhesion to sealing members and maintaining low-temperature fixing ability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a polymerized toner with low-temperature fixing ability is used, then the fixing temperature is reduced, but the toner leaks from the developing cartridge
Solution Approach 1:
The patent changes the physical and chemical parameters of the release agent, specifically selecting an ester compound with a melting point of 40°C or lower and controlling its content at 5-40 parts by weight per 100 parts by weight of the polymerized toner. This parameter optimization allows the toner to maintain low-temperature fixing ability while preventing leakage by controlling the toner's flow characteristics and adhesion properties.
Solution Approach 2:
The patent creates a composite structure by combining the polymerized toner particles with a specific release agent (ester compound). This composite formulation, where the release agent is incorporated into the toner composition, enables the toner to exhibit both low-temperature fixing capability and reduced leakage tendency through the synergistic effect of the components.
2Manufacturing precision
If the toner is spherical in form for high resolution, then dot reproducibility is improved, but the toner easily gets through sealing members and leaks
Solution Approach 1:
The patent changes the surface and flow parameters of the spherical toner particles by incorporating a release agent with specific properties (melting point ≤40°C, ester compound). This modifies the toner's interaction with sealing members, reducing adhesion and preventing leakage while preserving the spherical shape necessary for high dot reproducibility.
3Temperature
If a release agent with low melting point is used for low-temperature fixing, then fixing temperature is reduced, but the toner adheres to the developing roller and leaks
Solution Approach 1:
The patent optimizes the melting point parameter of the release agent to be 40°C or lower, and controls the content at 5-40 parts by weight per 100 parts by weight of polymerized toner. This precise parameter control ensures the release agent provides sufficient lubrication to prevent adhesion to the developing roller while maintaining low-temperature fixing capability.
Solution Approach 2:
The patent formulates a composite toner system where the polymerized toner is combined with a specifically selected ester compound as release agent. This composite structure enables the release agent to effectively reduce adhesion forces between the spherical toner particles and the developing roller surface, preventing the harmful adhesion effect while preserving low-temperature fixing.
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 effectively prevents leakage from developing cartridges while maintaining high resolution and low-temperature fixing capabilities, ensuring reliable operation in high-speed image-forming devices.
Implementation Method 1
the release agent is an ester compound having an endothermic peak temperature in a specific range
Implementation Method 2
the toner which gets through between the sealing member and the developing roller is easily melted due to the friction lead from sliding
Data Source
AI summary
An object of the present invention is to provide a polymerized toner which has low-temperature fixing ability and is not likely to leak the toner from a developing cartridge, especially, when the toner is used for a high-speed image-forming device.A polymerized toner produced by polymerizing a polymerizable monomer composition comprising a polymerizable monomer, a colorant and a release agent in an aqueous medium is used, wherein:(1) the release agent is an ester compound;(2) the release agent is in the content from 1 part by weight or more to 9 parts by weight or less per 100 parts by weight of a monovinyl monomer in the polymerizable monomer;(3) a maximum endothermic peak temperature in a DSC curve of the release agent is in the range from 55° C. or more to 90° C. or less; and(4) a melt index value of the polymerized toner at 150° C. under load of 98 N (10 kgf) is in the range from 1 g/10 min or more to 30 g/10 min or less.