Toner Composition with Isosorbide Polyester Resin for High-Speed Printing
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Solution Overview
Problem
Existing toners face challenges in achieving high transferability and durability, particularly during high-speed printing, due to issues with average circularity and the embedding of external additives, which affect their interaction with transfer members and durability.
Innovation Solution
A toner composition comprising a binder resin, a polyester resin A with an isosorbide unit, and a wax, where the polyester resin A is present in a specific molar ratio and content, and the wax is dispersed in a manner that inhibits dielectric polarization, enhancing transferability and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the average circularity of toner particles is increased, then transferability is improved, but the contact area between toner and transfer member increases leading to reduced transferability
Solution Approach 1:
The invention changes the physical and chemical parameters of the toner particle by incorporating specific resin compositions (polyester resin with isosorbide unit) and controlling particle morphology. This modifies the surface properties and attachment force characteristics, allowing optimization of transferability without simply increasing circularity, thereby resolving the contradiction between contact area and transfer efficiency
2Reliability
If external additives are added to improve toner performance, then transferability is enhanced, but external additives become embedded in toner particles causing decreased durability
Solution Approach 1:
The invention uses a composite resin system consisting of binder resin and polyester resin with isosorbide unit, creating a multi-phase structure that provides both the desired transferability and durability. The specific composition and structure prevent additive embedding while maintaining performance, resolving the contradiction between transferability enhancement and durability preservation
3Reliability
If toner viscoelasticity is controlled to improve external additive adhesion, then transferability is improved, but external additives become embedded in toner particles resulting in decreased durability
Solution Approach 1:
The invention optimizes the viscoelasticity parameter through specific resin composition (polyester resin with isosorbide unit at controlled content), achieving the right balance where additives adhere sufficiently for good transferability but do not embed into the particle structure, thus preserving durability while maintaining transfer performance
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 favorable durability and high transferability during high-speed printing by optimizing the attachment force between the toner and transfer member, while maintaining charging characteristics and preventing hygroscopicity issues.
Implementation Method 1
the wax is dispersed in a manner that inhibits dielectric polarization, enhancing transferability and durability
Data Source
AI summary
A toner including a toner particle that contains a binder resin, a polyester resin A and a wax, wherein the polyester resin A contains a specific amount of an isosorbide unit based on a total number of monomer units constituting the polyester resin A, the content of the polyester resin A is a specific amount, and when observing a cross-section of the toner, twenty toner particle cross-sections are selected that have a major axis R (μm) that satisfies a specific relationship with respect to the weight-average diameter D4 (μm) of the toner, each major axis r that have the largest major axis is measured for those domains composed of wax present in the selected toner particle cross-sections, and the arithmetic mean (r/R)st of the determined r/R satisfies a specific relationship.