Toner Composition with Styrene Elastomer and Low-MW Release Agent
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Solution Overview
Problem
Toner formulations with relatively-low-molecular-weight release agents exhibit improved low-temperature fixability but are prone to bleeding, leading to printing failures, while high-molecular-weight agents compromise storage stability and fixability balance.
Innovation Solution
A toner composition combining a styrene-based thermoplastic elastomer with a fatty acid ester compound of specific molecular weight range (500-2000) and content (2-20 parts by mass) to maintain low-temperature fixability and high-temperature storage stability, reducing release agent bleeding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a relatively-low-molecular-weight release agent is used in the toner, then low-temperature fixability is improved, but the release agent bleeds out easily causing printing failures
Solution Approach 1:
The patent changes the molecular weight parameter of the release agent to a specific range (500-2000) and adjusts its content (2-20 parts by mass per 100 parts by mass of binder resin) to achieve optimal balance between low-temperature fixability and prevention of bleeding, resolving the contradiction between fixing temperature improvement and printing durability
Solution Approach 2:
The patent uses a composite toner formulation combining the binder resin, colorant, and the specifically selected release agent (fatty acid ester compound with Mn of 500-2000) to create a synergistic system that maintains both low-temperature fixability and storage stability, preventing the bleeding issue that occurs with simpler formulations
2Stability of the object's composition
If a high-molecular-weight release agent is used in the toner, then storage stability is improved, but low-temperature fixability deteriorates
Solution Approach 1:
The patent optimizes the molecular weight parameter of the release agent within the range of 500-2000 (number average molecular weight), which is high enough to prevent bleeding and improve storage stability, yet low enough to maintain good low-temperature fixability, thus resolving the contradiction between storage stability and fixing temperature
3Use of energy by stationary object
If the toner is designed for low-temperature fixing, then power consumption is reduced, but fusion of toner particles occurs at high temperature reducing storage stability
Solution Approach 1:
The patent adjusts the molecular weight and content parameters of the release agent to create a formulation that enables low-temperature fixing (reducing power consumption) while simultaneously maintaining high storage stability by preventing toner particle fusion through the optimized release agent 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 achieves an excellent balance between high-temperature storage stability and low-temperature fixability, minimizing release agent bleeding and ensuring printing durability even under long-term high-temperature conditions.
Implementation Method 1
decreasing the glass transition temperature (Tg) of the toner
Implementation Method 2
incorporating a low-melting-point resin and/or a low-molecular-weight resin in the toner, and incorporating a low-softening-point substance (a release agent) with releasability (removability) such as wax in the toner
Data Source
AI summary
The toner for developing electrostatic images, comprising: colored resin particles comprising a binder resin, a colorant and a release agent, and an external additive. The colored resin particles further comprise a styrene-based thermoplastic elastomer. The styrene-based thermoplastic elastomer comprises an isoprene unit. A content of a fatty acid ester compound having a number average molecular weight (Mn) of 500 or more and less than 2,000 as the release agent, is from 2 parts by mass to 20 parts by mass with respect to 100 parts by mass of the binder resin.