Silyl-Azo Toner Composition Balancing Fixability and Storage Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing toners face a trade-off between low-temperature fixability and heat-resistant storage stability, with previous methods failing to adequately improve both performance metrics simultaneously.
Innovation Solution
A toner composition comprising a binder resin, resin A with a substituted or unsubstituted silyl group, and resin B with an azo group, which forms hydrogen bonds to create a strong crosslinked structure for improved stability and rapid dissociation at high temperatures for enhanced fixability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If crosslinking density between alkoxysilyl groups is increased to improve heat-resistant storage stability, then storage stability is improved, but melt viscosity cannot be sufficiently lowered and low-temperature fixability deteriorates
Solution Approach 1:
The invention changes the chemical structure parameters of the binder resin by incorporating specific functional groups (carboxyl, hydroxyl, or amine groups) with controlled content ratios. This allows adjustment of the resin's thermal and rheological properties to achieve both adequate crosslinking for storage stability and sufficient melt flow for fixability.
Solution Approach 2:
The invention creates a composite binder resin system combining silane-modified resin with functional resins containing carboxyl, hydroxyl, or amine groups. This composite structure enables synergistic effects where the silane provides crosslinking for stability while the functional groups control melt viscosity and adhesion, resolving the trade-off between storage stability and fixability.
2Object-generated harmful factors
If crosslinking density is lowered to reduce melt viscosity and improve low-temperature fixability, then fixability is improved, but the network structure is reduced and heat-resistant storage stability deteriorates
Solution Approach 1:
The invention optimizes the content ratio of functional groups (carboxyl, hydroxyl, or amine groups) to precisely control the balance between crosslinking density and melt viscosity. By adjusting these chemical parameters, the resin maintains adequate network structure for storage stability while achieving sufficient flow properties for fixability.
Solution Approach 2:
The invention introduces specific functional groups at controlled concentrations within the binder resin matrix. These localized functional regions provide targeted adhesion and controlled crosslinking, allowing different parts of the resin system to fulfill different functions (stability vs. flow) simultaneously.
3Object-generated harmful factors
If Tg of the binder resin is reduced to improve low-temperature fixability while maintaining increased crosslinking density, then fixability may improve but melt viscosity is unlikely to decrease significantly
Solution Approach 1:
The invention changes multiple parameters simultaneously: functional group content ratio, molecular weight distribution, and chemical structure composition. This multi-parameter optimization allows reduction of effective crosslinking density and melt viscosity while maintaining storage stability, overcoming the limitation of single-parameter adjustments.
Solution Approach 2:
The functional groups (carboxyl, hydroxyl, amine) act as intermediaries that mediate between the crosslinked network structure and the melt flow behavior. These groups provide hydrogen bonding and dipole interactions that control adhesion and flow without requiring complete breakdown of the crosslinked structure, enabling fixability improvement without sacrificing storage stability.
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 both high low-temperature fixability and heat-resistant storage stability by maintaining a network structure during storage and rapidly breaking it during fixing, thereby optimizing toner performance.
Implementation Method 1
the resin B comprises an azo group in a molecule... forms hydrogen bonds to create a strong crosslinked structure
Implementation Method 2
preventing deformation of the toner by a three-dimensional network structure of the binder resin created by crosslinking between alkoxysilyl groups in the toner (generation of siloxane bond)
Implementation Method 3
rapidly breaking it during fixing... at high temperatures for enhanced fixability
Data Source
AI summary
A toner comprising a toner particle, wherein the toner particle comprises a binder resin, a resin A, and a resin B, the resin A comprises a substituted or unsubstituted silyl group in a molecule, a substituent of the substituted silyl group is at least one selected from the group consisting of an alkyl group having 1 or more carbon atoms, an alkoxy group having 1 or more carbon atoms, a hydroxy group, a halogen atom, and an aryl group having 6 or more carbon atoms, and the resin B comprises an azo group in a molecule.