Liquid Developer Resin Sharp Melting Offset Prevention
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Solution Overview
Problem
The decrease in fixation energy leads to a higher likelihood of resin melting at low temperatures, resulting in high-temperature offset issues in electrophotographic processes.
Innovation Solution
A liquid developer is formulated with an insulating liquid having a flash point not lower than 100°C and toner particles containing a resin with 80 mass% or more of a polyester resin, ensuring a storage elastic modulus ratio of G′(T0)/G′(T0+10) ≥ 10 at 50°C to 70°C, which enhances sharp-melting capability and prevents high-temperature offset.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If fixation energy is decreased to enable low-temperature fixation, then energy consumption is reduced, but the resin is more likely to melt and cause high-temperature offset
Solution Approach 1:
The patent changes the chemical composition parameters of the resin, specifically using a polyester resin with controlled crystallinity and melting point characteristics. By adjusting the resin's molecular structure and composition, the material melts sharply at a specific low temperature range, enabling low-temperature fixation while maintaining stability at higher temperatures to prevent offset
Solution Approach 2:
The patent creates a composite toner system combining polyester resin with specific additives and insulating liquids. This composite structure allows the resin to exhibit sharp-melting behavior at low temperatures for easy fixation, while the combined material system maintains sufficient thermal stability at higher temperatures to prevent image offset
2Temperature
If the resin softening point is lowered to reduce fixation temperature, then fixation energy is decreased, but the resin becomes too soft and causes high-temperature offset
Solution Approach 1:
The patent exploits the phase transition characteristics of polyester resin, which exhibits sharp-melting behavior at a specific temperature point. The resin transitions from solid to liquid state sharply at its melting point, enabling complete fusion and fixation at low temperatures, while maintaining solid stability above this temperature to prevent unwanted softening and offset
Solution Approach 2:
The patent precisely controls the resin's thermal parameters, specifically designing a polyester resin with a melting point optimized for sharp transition. By adjusting the resin's crystallinity and molecular weight, the material achieves complete melting at low fixation temperatures while maintaining structural integrity at higher temperatures
3Use of energy by moving object
If a resin with low melting point is used to reduce fixation energy, then energy consumption is reduced, but the resin lacks sufficient stability and causes high-temperature offset
Solution Approach 1:
The patent changes the resin's compositional parameters by selecting polyester resin with specific crystallinity and melting point characteristics. This allows the resin to have low enough melting point for energy-efficient fixation while maintaining sufficient thermal stability through its crystalline structure to prevent softening at higher temperatures
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 solution effectively decreases fixation energy while preventing high-temperature offset by maintaining the insulating liquid's high viscosity and ensuring the resin's crystallinity, allowing for reliable fixation at low temperatures without image quality degradation.
Implementation Method 1
maintaining the insulating liquid's high viscosity
Implementation Method 2
ensuring the resin's crystallinity
Implementation Method 3
storage elastic modulus ratio of G′(T0)/G′(T0+10) ≥ 10 at 50°C to 70°C, which enhances sharp-melting capability
Data Source
AI summary
A liquid developer includes an insulating liquid and toner particles dispersed in the insulating liquid. The insulating liquid has a flash point not lower than 100° C. The toner particles contain a resin, and the resin contains 80 mass % or more of a first resin containing a component derived from a polyester resin. A solid content of the liquid developer corresponding to a portion of the liquid developer excluding the insulating liquid satisfies relation of G′(T0)/G′(T0+10)≧10 (50° C.≦T0≦70° C.), where G′(T0) represents a storage elastic modulus at a temperature T0 (° C.) and G′(T0+10) represents a storage elastic modulus at a temperature (T0+10) (° C.).