Electrophotography Toner with Polyhydroxyamine for Charge Rise
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Solution Overview
Problem
Current toners for electrophotography face challenges in achieving excellent charge rise properties and odor suppression, particularly during high-speed printing, with existing binder components not fully addressing these demands.
Innovation Solution
Incorporating a polyhydroxyamine compound, specifically represented by a certain formula, into the toner formulation, which enhances charge rise properties and odor suppression by interacting with the binder resin, allowing for rapid charging and improved dispersion with charge controlling agents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional binder components are used in toner formulations, then the toner can maintain basic electrophotographic function, but the charge rise property is insufficient for high-speed printing applications
Solution Approach 1:
The patent modifies the chemical composition parameters of the binder resin by incorporating polyhydroxyamine compounds with specific molecular structures (formula 1) and controlling their content within 0.001-5.0 parts by mass per 100 parts of binder resin. This chemical parameter change enables faster charge rise speed while maintaining charge stability through the unique amino-hydroxy group configuration of the polyhydroxyamine compound
Solution Approach 2:
The patent creates a composite binder resin system by combining conventional binder resins (polyester, polyamide, styrene resin, epoxy resin, or polyurethane) with polyhydroxyamine compounds. This composite material approach allows the toner to achieve both rapid charge rise property from the polyhydroxyamine compound and adequate charge stability from the conventional binder resin matrix
2Productivity
If high-speed printing is implemented, then productivity increases, but the toner charge rise property becomes insufficient leading to performance degradation
Solution Approach 1:
The patent changes the chemical composition parameters of the toner by incorporating polyhydroxyamine compounds at controlled concentrations (0.001-5.0 parts by mass per 100 parts of binder resin). This enables the toner to achieve rapid charge rise speed that matches high-speed printing requirements, allowing productivity increase without performance degradation
3Reliability
If binder resin content is increased to improve toner stability, then charge stability improves, but odor from the binder resin increases
Solution Approach 1:
The patent introduces polyhydroxyamine compounds as intermediary substances that interact with binder resin odors through their amino and hydroxy groups. These compounds act as odor-suppressing agents while simultaneously improving charge rise speed, allowing the use of adequate binder resin content for stability without excessive odor generation
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 use of the polyhydroxyamine compound results in toners with superior charge rise properties and odor suppression capabilities, enhancing the performance and stability of electrophotographic processes.
Implementation Method 1
the polyhydroxyamine compound contains in the molecule thereof an amino group having a tendency to hold a positive charge and a hydroxy group having a tendency to hold a negative charge, and therefore the toner can be rapidly charged through the charge shift from the amino group to the hydroxy group for the negatively charged toner, or the charge shift from the hydroxy group to the amino group for the positively charged toner
Data Source
AI summary
To provide a toner for electrophotography exhibiting an excellent charge rise property, and a process for producing the same. [1] A toner for electrophotography containing a binder resin, and a polyhydroxyamine compound represented by the following formula (1) in an amount of 0.001 part by mass or more and 5.0 parts by mass or less per 100 parts by mass of the binder resin, and [2] a process for producing a toner for electrophotography, including: melt-kneading a toner raw material mixture containing a binder resin, and a polyhydroxyamine compound represented by the following formula (1) in an amount of 0.001 part by mass or more and 5.0 parts by mass or less per 100 parts by mass of the binder resin; and pulverizing a resulting melt-kneaded material.