Toner Particle Composition for Heat Resistance and Fixation
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Solution Overview
Problem
Current toners face challenges in achieving high heat resistance, development performance, transferability, and low-temperature fixation ability simultaneously, especially under high-temperature and high-humidity environments, with existing core shell structures experiencing durability issues and storage stability problems.
Innovation Solution
A toner particle composition comprising a binding resin, a polar resin H, and a polar resin L, with specific solubility parameters, glass transition points, and molecular weights, granulated in a water-based medium, forming a three-layer structure that enhances compatibility and durability while maintaining low-temperature fixation ability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a core shell structure toner is used to improve heat resistance and durability, then heat resistance and durability are improved, but low-temperature fixation ability deteriorates
Solution Approach 1:
The toner particle is divided into a core region and a surface region with different resin compositions. The core contains binding resin and polar resin L for low-temperature fixation ability, while the surface contains polar resin H for heat resistance. This local differentiation allows each region to optimize its function without compromising the other.
Solution Approach 2:
The invention uses a composite resin system combining binding resin, polar resin H, and polar resin L in specific proportions. The composite structure leverages the complementary properties of each resin component to achieve both heat resistance and low-temperature fixation ability simultaneously.
2Reliability
If polar resin content is increased to improve development performance, then development performance is improved, but storage stability deteriorates
Solution Approach 1:
The invention optimizes the molecular weight parameters of polar resin H (5,000-15,000) and polar resin L (10,000-30,000) to achieve the right balance. By controlling these physical parameters within specific ranges, the toner maintains both high development performance and storage stability.
Solution Approach 2:
Polar resin H with higher polarity is concentrated in the surface region to enhance development performance, while polar resin L is distributed in the core to maintain storage stability. This spatial distribution of different resin qualities resolves the contradiction between performance and stability.
3Use of energy by stationary object
If toner is designed for low-temperature fixation to improve energy efficiency, then low-temperature fixation ability is improved, but heat resistance deteriorates
Solution Approach 1:
The surface region contains polar resin H specifically to provide heat resistance, while the core region maintains low-temperature fixation properties. This allows the toner to fix images at lower temperatures while still resisting heat degradation during storage and handling.
Solution Approach 2:
The composite resin system combines resins with different thermal properties. The binding resin provides baseline thermal stability, polar resin H enhances heat resistance at the surface, and polar resin L enables low-temperature fixation, creating a multi-functional material system.
4Temperature
If surface layer thickness is increased to improve heat resistance, then heat resistance is improved, but durability deteriorates due to peeling or cracking
Solution Approach 1:
The invention optimizes the thickness of the surface layer containing polar resin H to be within specific proportions relative to the total particle size. This parameter optimization ensures sufficient heat resistance while maintaining adequate adhesion strength to prevent peeling and cracking.
Solution Approach 2:
The surface layer with polar resin H is designed with specific local properties including controlled thickness and polarity distribution. This localized optimization provides heat resistance where needed while maintaining overall particle integrity and durability.
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 improved heat resistance, development performance, transferability, and storage stability under high-temperature conditions, with enhanced durability and reduced risk of surface peeling or cracking, maintaining high glossiness and durability even in severe use conditions.
Implementation Method 1
when an SP value of the binding resin is denoted by δB ((cal/cm3)1/2), an SP value of the polar resin H is denoted by δH ((cal/cm3)1/2), and an SP value of the polar resin L is denoted by δL ((cal/cm3)1/2), the following formulas are satisfied; 1.00≦δH−δB≦3.00, |δL−δB|≦0.70
Implementation Method 2
when a glass transition point of the polar resin H is denoted by TgH (° C.) and a glass transition point of the polar resin L is denoted by TgL (° C.), the following formulas are satisfied; 65.0≦TgH≦85.0, 75.0≦TgL≦105.0, TgH≦TgL
Data Source
AI summary
A toner includes a toner particle, which contains at least a binding resin, a colorant, and two types of polar resins, i.e., a polar resin H and a polar resin L, and which is obtained with granulation in a water-based medium, wherein solubility parameters, glass transition points, and weight-average molecular weights of the binding resin, the polar resin H, and the polar resin L, as well as amounts of the added resins satisfy respective specific relationships.