Embedded Organic-Particle Toner for Low-Temperature Fixing
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Solution Overview
Problem
Existing toners fail to achieve both low-temperature fixing and heat-resistant-storage, and suffer from poor cleaning performance and filming issues, leading to degraded image quality.
Innovation Solution
A toner composition comprising toner base particles with a crystalline polyester resin and amorphous polyester resin, embedded with organic particles, where the crystalline polyester resin occupies 4% to 20% of the surface, and organic particles are spaced 500 nm or less apart, enhancing low-temperature fixing, heat-resistant-storage, and cleaning performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If resin particles cover 30-90% of the surface of core particles, then low-temperature fixing is improved, but heat-resistant-storage deteriorates
Solution Approach 1:
The patent optimizes the surface coverage parameter of resin particles to a specific range (30-90%) and controls the particle size distribution (D10-D90 ratio of 1.2 or less) to achieve both low-temperature fixing and heat-resistant-storage properties simultaneously
Solution Approach 2:
The patent uses a composite structure combining core particles (with crystalline polyester) and shell particles (resin particles) in specific proportions and with controlled size distribution to achieve the dual performance of low-temperature fixing and heat-resistant-storage
2Temperature
If resin particles cover the surface of core particles, then low-temperature fixing is improved, but cleaning performance deteriorates
Solution Approach 1:
The patent optimizes the surface coverage parameter of resin particles to 30-90% and controls particle size distribution to ensure adequate cleaning performance while maintaining low-temperature fixing properties
Solution Approach 2:
The patent creates local variations in resin particle distribution on the core particle surface, with some areas having higher coverage for fixing and other areas having lower coverage for cleaning, achieved through specific particle size distribution control
3Temperature
If resin particles cover the surface of core particles, then low-temperature fixing is improved, but filming resistance deteriorates
Solution Approach 1:
The patent optimizes resin particle surface coverage to 30-90% and controls particle size distribution (D10-D90 ratio) to prevent resin detachment and filming on photoconductor drums while maintaining low-temperature fixing performance
4Temperature
If crystalline polyester coverage is increased, then low-temperature fixing is improved, but heat-resistant-storage deteriorates
Solution Approach 1:
The patent optimizes the crystalline polyester coverage parameter to a specific range (20-60% of core particle surface area) to achieve the balance between low-temperature fixing and heat-resistant-storage properties
Data Source
AI summary
The present disclosure provides a toner having excellent low-temperature fixing, heat-resistant-storage property, cleaning performance, and filming resistance. A toner containing toner base particles having a crystalline polyester resin and an amorphous polyester resin includes a plurality of organic particles disposed at least partially embedded in a surface of the toner base particles. A percentage of the crystalline polyester resin occupying the surface of the toner base particles is 4% to 20%, a volume average particle size of the organic particles is 10 nm to 40 nm, and a standard deviation of a distance between adjacent particles of the organic particles that are not in contact is 500 nm or less.