Toner Particles with Surface Styrene Resin for Streak Reduction
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Solution Overview
Problem
In high-speed image-forming apparatuses with toner reclaim systems, toners with release agents localized in the surface layer tend to cause color spots and streaks, especially at high temperature and humidity, due to excessive exposure of the release agent leading to adhesion and aggregation issues.
Innovation Solution
The electrostatic-image developing toner contains a binder resin with a polyester base, a release agent with 70% or more localized within 800 nm of the surface, and a styrene-(meth)acrylic resin present in 5 to 25 atomic percent of the surface components, which adheres to the release agent and inhibits its adhesion to transport paths, reducing aggregate formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If release agent is localized in the surface layer of toner particles, then separation of fixed image from fixing member is improved, but color spots and streaks occur due to excessive exposure of release agent
Solution Approach 1:
The patent applies local quality by creating a layered structure where the release agent is concentrated in the surface layer (within 800 nm from the surface) while the styrene-(meth)acrylic resin is present in the surface components (5 to 25 atomic percent). This localized distribution ensures the release agent can perform its separation function while the styrene-(meth)acrylic resin controls its excessive exposure, preventing color spots and streaks.
Solution Approach 2:
The patent uses composite materials by combining polyester resin as the binder resin base with styrene-(meth)acrylic resin added to the surface. This composite structure allows the release agent to be effectively localized in the surface layer while the styrene-(meth)acrylic resin components regulate the release agent's exposure, resolving the contradiction between separation performance and image quality.
2Reliability
If release agent is localized within 800 nm from surface, then toner separation performance is improved, but release agent adhesion to transport paths increases causing aggregation
Solution Approach 1:
The patent applies local quality by concentrating the release agent within 800 nm from the surface while simultaneously ensuring styrene-(meth)acrylic resin is present in the surface components (5 to 25 atomic percent). This localized dual-component structure allows the release agent to maintain separation performance while the styrene-(meth)acrylic resin prevents excessive adhesion to transport paths, reducing aggregate formation.
Solution Approach 2:
The styrene-(meth)acrylic resin acts as an intermediary between the release agent and the transport path. By being present in the surface components, it mediates the interaction, allowing the release agent to perform its separation function while preventing direct adhesion to transport paths that would cause aggregation.
3Object-generated harmful factors
If styrene-(meth)acrylic resin is present in surface components, then release agent adhesion is controlled, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies parameter changes by specifying quantitative ranges for the styrene-(meth)acrylic resin content (5 to 25 atomic percent of surface components) and the release agent distribution (70% or more within 800 nm from surface). These defined parameters provide clear manufacturing targets that balance adhesion control with manufacturability.
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 composition significantly reduces color spots and streaks by ensuring the release agent adheres to the styrene-(meth)acrylic resin rather than transport paths, improving image quality at high temperature and humidity conditions.
Implementation Method 1
a styrene-(meth)acrylic resin present in an amount of about 5 to about 25 atomic percent of the resin components in the surfaces of the toner particles... which adheres to the release agent and inhibits its adhesion to transport paths
Data Source
AI summary
An electrostatic-image developing toner contains toner particles. The toner particles contain a binder resin, a release agent, and a styrene-(meth)acrylic resin. The binder resin contains a polyester resin. About 70% or more of all release agent is present within about 800 nm from surfaces of the toner particles. The styrene-(meth)acrylic resin is present in an amount of about 5 to about 25 atomic percent of the resin components in the surfaces of the toner particles as determined by X-ray photoelectron spectroscopy (XPS).