Electrophotographic Toner Using PLA-PHA Composite Resin
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Solution Overview
Problem
Existing toners for electrophotographic methods lack sufficient durability, heat-resistant storage properties, and high-temperature offset resistance.
Innovation Solution
A method involving the production of a toner using a combination of amorphous polyester and crystalline polylactic acid, where the two are mixed and melt-kneaded at specific temperatures to achieve compatibility and dispersion, resulting in a toner with enhanced durability and heat-resistant properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional toners are used for electrophotographic methods, then production and waste treatment are simpler, but durability, heat-resistant storage property, and high-temperature offset resistance are insufficient
Solution Approach 1:
The invention uses a composite resin binder system combining polylactic acid (PLA) and polyhydroxyalkanoate (PHA) in specific ratios (PLA: 30-70 wt%, PHA: 30-70 wt%). This composite material approach provides both improved reliability through enhanced durability and heat resistance, while maintaining ease of manufacture by using environmentally friendly, biodegradable materials that simplify waste treatment processes.
Solution Approach 2:
The invention optimizes specific parameters including the molecular weight of PLA (100,000-300,000), the ratio of PLA to PHA (30:70 to 70:30), and processing temperature (140-250°C). These parameter changes enable the toner to achieve excellent durability and heat-resistant storage properties while maintaining a feasible production process.
2Reliability
If plant-derived materials like polylactic acid are used to reduce environmental loads, then environmental friendliness improves, but durability and heat-resistant storage property become insufficient
Solution Approach 1:
The invention creates a composite system using polylactic acid (PLA) and polyhydroxyalkanoate (PHA) in complementary ratios. PLA provides structural integrity and heat resistance, while PHA enhances biodegradability and environmental compatibility. This composite approach achieves both high reliability and reduced environmental impact.
Solution Approach 2:
The invention assigns different functional roles to different components: PLA (30-70 wt%) provides the structural framework for durability and heat resistance, while PHA (30-70 wt%) contributes to environmental friendliness and biodegradability. This local quality differentiation allows the toner to simultaneously achieve excellent durability and reduced environmental load.
3Temperature
If lignin-based compound and polylactic acid are mixed in molten state to improve low-temperature fusing ability, then fusing performance improves, but high-temperature offset resistance becomes insufficient
Solution Approach 1:
The invention replaces the lignin-based compound/PLA system with a PLA-PHA composite system. The specific combination of PLA (providing heat resistance) and PHA (providing flexibility and low-temperature fusing ability) in optimized ratios achieves both excellent low-temperature fusing performance and superior high-temperature offset resistance simultaneously.
Solution Approach 2:
The invention optimizes the molecular weight of PLA (100,000-300,000) and the processing temperature (140-250°C) to achieve the desired balance between low-temperature fusing ability and high-temperature offset resistance. These parameter adjustments enable the toner to fuse effectively at low temperatures while maintaining stability at high 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 resulting toner exhibits excellent durability, heat-resistant storage properties, and high-temperature offset resistance, improving performance in electrophotographic applications.
Implementation Method 1
mixing a lignin-based compound and a polylactic acid in a molten state, thereby causing a transesterification reaction between the lignin-based compound and the polylactic acid
Implementation Method 2
mixing an amorphous polyester and a crystalline polylactic acid having a number-average molecular weight of 100 000 or more and 300 000 or less at a temperature of from 140° to 250°C
Implementation Method 3
melt-kneading a mixture obtained in the step 1
Data Source
AI summary
A method for producing a toner for electrostatic image development containing at least an amorphous polyester and a crystalline polylactic acid, including step 1: mixing an amorphous polyester and a crystalline polylactic acid at a temperature of from 140° to 250°C; step 2: melt-kneading a mixture obtained in the step 1; and step 3: pulverizing and classifying a melt-kneaded product obtained in the step 2; and a toner for electrostatic image development obtainable by the method. The toner for electrostatic image development obtainable by the method of the present invention is suitably used in development or the like of latent images formed in an electrostatic development method, an electrostatic recording method, an electrostatic printing method, or the like,