Toner Production Using Nonionic Surfactant for Stable Dispersion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional toner production methods face challenges with long-term stability of colorant-dispersed solutions, leading to segregation and distorted particle diameter distributions, resulting in inferior durability and developing performance.
Innovation Solution
A method involving a nonionic surfactant with an oxyalkylene group and a hydrophile-lipophile balance value (HLB) between 9.0 and 17.0 is used to disperse pigments in a liquid mixture, preventing sedimentation and aggregation, and ensuring uniform dispersion, even after long-term standing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional production methods are used without specific surfactant control, then the production process is simpler, but the colorant-dispersed solution undergoes segregation and shows distorted particle diameter distribution during long-term standing
Solution Approach 1:
The patent applies parameter changes by specifying precise HLB value ranges (9.0-17.0) for nonionic surfactants and controlling the average number of oxyalkylene groups (3-20). By optimizing these parameters, the colorant-dispersed solution achieves stable dispersion properties and prevents segregation during long-term standing, resolving the contradiction between stability and process complexity.
Solution Approach 2:
The patent introduces nonionic surfactants as intermediary substances that mediate between the colorant particles and the liquid dispersion medium. These surfactants adsorb onto colorant surfaces and provide steric hindrance, preventing aggregation and segregation. The specific HLB value range ensures optimal balance between hydrophobic and hydrophilic properties, maintaining dispersion stability without requiring overly complex production processes.
2Loss of time
If the colorant-dispersed solution is allowed to stand for extended periods, then more time is available for dispersion stabilization, but segregation occurs and particle diameter distribution becomes distorted
Solution Approach 1:
The patent applies preliminary action by pre-optimizing the surfactant formulation before the standing period begins. By selecting nonionic surfactants with specific HLB values (9.0-17.0) and controlling oxyalkylene group content (3-20 average), the dispersion system is prepared in advance to resist segregation. This preliminary configuration allows the solution to stand without losing dispersion uniformity, effectively turning the standing period from harmful into beneficial for quality control.
3Adaptability or versatility
If multiple toner product types are produced to meet diverse device requirements, then adaptability increases, but long-term stability becomes more difficult to maintain across product changes
Solution Approach 1:
The patent applies universality by developing a surfactant-based dispersion system that can be universally applied across multiple toner product types. The nonionic surfactants with HLB values of 9.0-17.0 provide a stable dispersion mechanism that works for various colorants and toner formulations. This universal approach allows the same fundamental dispersion stabilization principle to be applied across different product lines, maintaining stability while enabling product diversity.
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 stabilizes the colorant dispersion, producing toner particles with excellent durability, ageing resistance, and sharp particle diameter distributions, maintaining high developing performance.
Implementation Method 1
the liquid mixture contains a nonionic surfactant and the nonionic surfactant has at least an oxyalkylene group and has a hydrophile-lipophile balance value (HLB value) of 9.0 or more and 17.0 or less
Implementation Method 2
obtaining a colorant-dispersed solution by dispersing a pigment-containing colorant in a liquid mixture
Data Source
AI summary
A method of stably producing a toner is provided. This method provides a long-term stabilization of material dispersion in a colorant-dispersed solution and inhibits segregation of the material and provides a more microfine and more uniform dispersion of the colorant in the toner, and moreover produces a toner that has a sharp toner particle diameter distribution. This method of producing toner has at least a colorant dispersion step of obtaining a colorant-dispersed solution by dispersing a pigment-containing colorant in a liquid mixture that contains the colorant and a dissolved resin solution or a polymerizable monomer, wherein the liquid mixture contains a nonionic surfactant and the nonionic surfactant has at least an oxyalkylene group and has a hydrophile-lipophile balance value (HLB value) of 9.0 or more and 17.0 or less.