Core-Shell Toner Resin for Electrophotography
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Solution Overview
Problem
Existing toners for electrophotography face a contradiction between low-temperature fusing properties and heat-resistant storage properties, with core-shell structures exhibiting insufficient compatibility leading to inadequate performance in both low-temperature fusing and anti-hot offset properties.
Innovation Solution
A toner with a core-shell structure comprising an amorphous composite resin core containing a polyester resin and a styrene-containing addition polymer, and an amorphous resin shell formed by polycondensing an aliphatic diol with a carboxylic acid component, which enhances bonding between the core and shell, improving both low-temperature fusing and anti-hot offset properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the toners are designed to have a low softening point or a low glass transition point in order to improve a low-temperature fixing property, then the low-temperature fusing property is improved, but the heat-resistant storage property is deteriorated
Solution Approach 1:
The toner particles are divided into a core portion and a shell portion with distinct resin compositions. The core uses a polyester resin with controlled glass transition temperature for low-temperature fusing, while the shell uses a different resin to provide heat-resistant storage stability, thereby resolving the contradiction between low-temperature fusing and heat-resistant storage properties
Solution Approach 2:
The invention employs composite resin structures where the core contains a polyester resin with specific glass transition temperature characteristics and the shell contains a different resin composition. This composite approach allows the toner to exhibit both low-temperature fusing capability (from the core) and heat-resistant storage stability (from the shell), simultaneously satisfying contradictory requirements
2Reliability
If a core-shell structure is used to satisfy both low-temperature fusing property and heat-resistant storage property, then both properties are improved, but the bonding between core and shell is insufficient leading to inadequate performance
Solution Approach 1:
The invention optimizes the glass transition temperature of the polyester resin in the core portion and the composition of the shell resin to achieve adequate bonding strength. By carefully controlling the resin parameters (glass transition temperature, molecular weight, composition ratios), the bonding between core and shell is enhanced while maintaining both low-temperature fusing and heat-resistant storage properties
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 excellent low-temperature fusing and anti-hot offset properties by maintaining a stable core-shell structure with adequate bonding strength, effectively balancing the contradictory requirements of low-temperature fusing and heat-resistant storage properties.
Implementation Method 1
an amorphous resin shell formed by polycondensing an aliphatic diol with a carboxylic acid component
Data Source
AI summary
The present invention relates to a toner for electrophotography including core-shell particles each including a core containing a amorphous composite resin (A) which contains a segment (A1) formed of a polyester resin and a segment (A2) formed of a styrene-containing addition polymer as a constitutional unit thereof and a shell containing a amorphous resin (B) obtained by polycondensing an alcohol component containing an aliphatic diol having 2 to 6 carbon atoms with a carboxylic acid component.