Toner Fumaric Acid Crosslinking Fatty Acid Metal Salt Particles
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Solution Overview
Problem
Conventional toners fail to maintain image slipperiness and strength during prolonged rubbing processes, leading to image loss, as the fatty acid metal salt particles detach from the image surface due to their high mobility.
Innovation Solution
A toner formulation with a specific molar ratio of fumaric acid to fatty acid metal salt particles is used, which crosslinks the fatty acid metal salt particles, increasing their apparent molecular weight and reducing detachment, thereby maintaining image slipperiness and strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If fatty acid metal salt particles are added to toner to improve image slipperiness, then image slipperiness is improved, but image strength deteriorates upon prolonged rubbing due to particle detachment
Solution Approach 1:
The patent changes the physical-chemical parameters of the fatty acid metal salt particles by controlling their molecular weight and degree of polymerization. By selecting particles with specific molecular weight ranges and polymerization degrees, the patent achieves optimal balance between slipperiness and abrasion resistance, preventing particle detachment during prolonged rubbing while maintaining image slipperiness.
Solution Approach 2:
The patent creates a composite structure within the toner system by combining fatty acid metal salt particles with binder resin and other components in specific ratios. This composite approach ensures that the fatty acid metal salt particles remain stably integrated into the toner matrix, preventing their detachment during image formation and rubbing processes while maintaining the desired slipperiness.
2Ease of operation
If fatty acid metal salt particles are used as external additive, then image slipperiness is improved, but particle detachment occurs during prolonged rubbing leading to image loss
Solution Approach 1:
The patent modifies the parameters of the fatty acid metal salt particles, specifically controlling their molecular weight and polymerization degree, to achieve optimal performance. By selecting particles within specific parameter ranges, the patent ensures both slipperiness and resistance to detachment during prolonged rubbing, thereby improving image durability.
Solution Approach 2:
The patent performs preliminary characterization and selection of fatty acid metal salt particles based on their molecular weight and polymerization degree before incorporating them into the toner formulation. This preliminary action ensures that only particles with appropriate properties are used, preventing detachment issues during subsequent rubbing processes and ensuring long-term image durability.
3Ease of manufacture
If conventional toner formulation is used, then manufacturing is simple, but image abrasion resistance is insufficient upon prolonged rubbing
Solution Approach 1:
The patent adjusts the parameters of the toner formulation, specifically the molecular weight and polymerization degree of the fatty acid metal salt particles, to enhance abrasion resistance. By controlling these parameters within specific ranges, the patent maintains the simplicity of the formulation process while significantly improving the image's resistance to abrasion during prolonged rubbing.
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 suppresses image loss and maintains abrasion resistance and slipperiness even after prolonged rubbing by optimizing the crosslinking of fatty acid metal salt particles, ensuring improved image durability.
Implementation Method 1
crosslinks the fatty acid metal salt particles, increasing their apparent molecular weight and reducing detachment
Implementation Method 2
exhibits excellent surface slipperiness, brought about by the lubricant action of fatty acid metal salt particles
Data Source
AI summary
A toner comprising a toner particle comprising a binder resin, and an external additive, wherein the external additive comprises a fatty acid metal salt particle; the toner comprises fumaric acid; with a (mol/g) as a content of the fumaric acid in the toner, and with b (mol/g) as a content of the fatty acid metal salt particle in the toner, Formula (1) below is satisfied:0.50≤a/b≤70.00.(1)