Toner with Encapsulated Releasing Agent for Offset Resistance
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Solution Overview
Problem
Conventional toners exhibit unsatisfactory hot-offset resistance and heat-resistant storage stability while maintaining low-temperature fixability, due to compatibility issues between resin particles when heated.
Innovation Solution
A toner composition featuring a binder resin with non-crystalline or crystalline components, along with releasing agent-encapsulating capsules formed from a vinyl resin, where the releasing agent is encapsulated and strategically positioned within the binder resin to prevent surface exposure, enhancing both hot-offset resistance and heat-resistant storage stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If resin particles are heated at elevated temperatures to achieve low-temperature fixability, then low-temperature fixability is improved, but compatibilization occurs between resins resulting in lowered heat-resistant storage stability
Solution Approach 1:
The releasing agent is segmented into discrete capsules that are distributed within the binder resin. This segmentation prevents the releasing agent from forming a continuous phase that could cause compatibilization between resin particles during heating, thereby maintaining heat-resistant storage stability while still enabling low-temperature fixability.
Solution Approach 2:
The releasing agent is nested within capsules formed of a resin different from the binder resin. This nested structure isolates the releasing agent from direct contact with binder resin particles, preventing compatibilization during storage even when heated, while allowing the releasing agent to function during the fixation process.
2Object-affected harmful factors
If releasing agent is present on toner surface to enable hot-offset resistance, then hot-offset resistance is improved, but releasing agent exposure reduces heat-resistant storage stability
Solution Approach 1:
The releasing agent is pre-positioned within capsules that are strategically located in the region from the toner surface to a depth of 0.10 times the volume-average particle diameter. This preliminary positioning ensures that the releasing agent is close enough to the surface to provide hot-offset resistance when needed, while remaining encapsulated to prevent premature exposure during storage.
Solution Approach 2:
The capsules containing the releasing agent are non-uniformly distributed with higher concentration near the toner surface (within 0.10 times the volume-average particle diameter). This local quality distribution ensures that the releasing agent is positioned where it is most needed for hot-offset resistance while maintaining encapsulation to preserve heat-resistant storage stability.
Data Source
Figure 1A
Figure 1B~1C
Figure 2
AI summary
A toner, including: a binder resin; releasing agent-encapsulating capsules; and a colorant, wherein the releasing agent-encapsulating capsules each include: a capsule formed of a resin (I) which is different from the binder resin; and a releasing agent (RA) which is encapsulated in the capsule, and the releasing agent-encapsulating capsules exist in the binder resin, and wherein 50% to 100% of the releasing agent-encapsulating capsules exist in a region from a surface of the toner to a depth of 0.10 times a volume-average particle diameter of the toner.