Liquid Developer Toner Resin Molecular Weight Control
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Solution Overview
Problem
Conventional liquid developers face challenges in maintaining long-term storage stability and achieving low-temperature fixing characteristics due to low affinity between insulation liquids and toner particles, leading to aggregation and poor reproducibility of images with high resolution and color accuracy.
Innovation Solution
A liquid developer comprising a fatty acid monoester and toner particles made from a resin material with a weight-average molecular weight between 20,000 and 200,000, where the resin material contains a component with a molecular weight of 10,000 or less, ensuring effective dispersibility and plasticization of toner particles, thereby preventing aggregation and facilitating low-temperature fixing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional insulation liquids are used in liquid developer, then the liquid developer can be formulated, but the toner particles aggregate and storage stability deteriorates
Solution Approach 1:
The patent changes the chemical parameters of the insulation liquid by specifying particular esters (alkyl esters of carboxylic acids with 10-24 carbon atoms) and their concentration ranges (5-50 wt%). This parameter optimization resolves the contradiction by achieving both good dispersibility (preventing aggregation) and long-term storage stability through careful selection of ester chain length and composition.
Solution Approach 2:
The patent creates a composite insulation liquid system combining multiple ester components (alkyl esters of carboxylic acids) with specific molecular weight ranges. This composite approach allows the liquid developer to maintain toner particle dispersion while achieving storage stability, as the different ester components work synergistically to prevent aggregation and maintain compositional stability.
2Temperature
If low molecular weight resin material is used in toner particles, then fixing at low temperature is achieved, but aggregation in liquid developer occurs
Solution Approach 1:
The patent optimizes the molecular weight parameters of the resin material within specific ranges (weight-average molecular weight 10,000-100,000, number-average molecular weight 5,000-50,000) and controls the ratio of low molecular weight components (5-50 wt%). This parameter control allows the toner to achieve low-temperature fixing while preventing aggregation in the liquid developer, as the balanced molecular weight distribution provides both plasticity for low-temperature fixation and structural integrity for storage stability.
3Ease of operation
If dry toner is used, then handleability is good, but contamination and adverse health effects occur
Solution Approach 1:
The patent transitions from solid dry toner to liquid toner (liquid developer), using a liquid medium (esters) to carry the toner particles. This hydraulic approach eliminates dust generation and contamination issues associated with dry powder handling, while the liquid formulation maintains good handleability and transferability to the recording medium.
4Manufacturing precision
If dry toner particles are made smaller for high resolution, then image resolution improves, but powder handling problems worsen
Solution Approach 1:
The patent uses a liquid carrier system to transport and deposit fine toner particles, eliminating the dust and contamination problems that would otherwise accompany handling of fine dry powder. The liquid medium allows precise control of particle deposition for high-resolution imaging while containing the fine particles to prevent contamination and health hazards.
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 provides superior preservability, storage stability, and high-speed image formation with improved fixing characteristics at low temperatures, ensuring clear and durable toner images without aggregation or peeling issues.
Implementation Method 1
the resin material containing a component of which molecular weight M is 10,000 or less, wherein the resin material is characterized in that, a weight-average molecular weight Mw of the resin material is in the range of 20,000 to 200,000
Implementation Method 2
an insulation liquid containing a fatty acid monoester and toner particles comprised of a resin material
Data Source
AI summary
A liquid developer includes an insulation liquid containing a fatty acid monoester and toner particles comprised of a resin material. The resin material is characterized in that a weight-average molecular weight Mw of the resin material is in the range of 20,000 to 200,000, and an amount of a component of which molecular weight M is 10,000 or less contained in the resin material is in the range of 5 to 40 wt %. The liquid developer described above is harmless to the environment. Further, the liquid developer also has superior preservability or storage stability and superior fixing characteristics at a low temperature. An image forming apparatus that can suitably use such a liquid developer is also provided.