Toner Additive Segmentation for Hot Offset Resistance
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Solution Overview
Problem
Current toners fail to achieve high hot offset resistance when printing on thin paper and exhibit poor durability in high-temperature environments due to compatibility issues between releasing agents and other components, leading to plasticization and reduced fixability.
Innovation Solution
A toner composition featuring an amorphous polyester resin, a releasing agent, and an additive with a polyester portion and a crystalline acrylic portion chemically bound together, which enhances dispersibility of the releasing agent while preventing plasticization, ensuring high hot offset resistance and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a graft copolymer of polyolefin resin and vinyl resin is added as an additive to improve releasing agent dispersibility, then hot offset resistance is improved, but the graft copolymer becomes compatible with the releasing agent causing plasticization and reduced durability in high-temperature environments
Solution Approach 1:
The additive is segmented into two distinct functional portions: a polyester portion that provides compatibility with the binding resin and a crystalline acrylic portion that provides compatibility with the releasing agent. This segmentation allows each portion to perform its specific function independently, resolving the contradiction between dispersibility improvement and plasticization prevention.
Solution Approach 2:
The additive is designed as a composite material combining polyester and crystalline acrylic components in a single molecular structure. This composite structure enables the additive to simultaneously provide both releasing agent dispersibility (through the crystalline acrylic portion) and resistance to plasticization (through the polyester portion's incompatibility with releasing agent).
2Object-affected harmful factors
If the releasing agent is uniformly dispersed in the toner to improve hot offset resistance, then the toner becomes more susceptible to plasticization due to compatibility, reducing durability
Solution Approach 1:
The crystalline acrylic portion of the additive acts as an intermediary that selectively interacts with the releasing agent to improve its dispersibility, while the polyester portion serves as an intermediary that maintains compatibility with the binding resin. This dual intermediary approach enables uniform releasing agent dispersion without causing excessive plasticization that would reduce durability.
3Manufacturing precision
If a block copolymer with polyester skeleton, styrene-based block, and crystalline acrylate-based block is used to improve fixability and charging stability, then the styrene-based block becomes compatible with the releasing agent causing the crystalline acrylate-based block to also become compatible, reducing durability
Solution Approach 1:
The invention extracts the problematic styrene-based component from the block copolymer structure and replaces it with a polyester portion that provides similar functional benefits (fixability and charging stability) without the harmful compatibility effect with the releasing agent. This extraction eliminates the source of the durability problem while preserving the desired performance characteristics.
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 exhibits improved hot offset resistance on thin paper and maintains high durability in high-temperature environments by uniformly dispersing the releasing agent and preventing compatibility-induced plasticization, thus enhancing fixability and image quality.
Implementation Method 1
enhances dispersibility of the releasing agent
Implementation Method 2
a polyester portion and a crystalline acrylic portion chemically bound to the polyester portion
Data Source
AI summary
A toner contains toner particles. The toner particles are made of a resin containing an amorphous polyester resin, a releasing agent, an additive and a coloring agent. The additive has a polyester portion and a crystalline acrylic portion that are chemically bound to each other.