Sustainable Polyester Resin Acid Value Control
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Solution Overview
Problem
The integration of bio-derived resins into toners and inks is challenging due to batch-to-batch variability in polycondensation reactions, leading to inconsistent acid value (AV) and the formation of unwanted side products, which affects the electrical performance and sustainability of the toner process.
Innovation Solution
A process utilizing dipropylene glycol as a diol monomer with a boiling point matching the reaction temperature, allowing for controlled polycondensation reactions to maintain the target acid value range of 10 to 16 without adding additional reagents, thereby reducing process time and materials while minimizing side product formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional polycondensation reactions are used to produce bio-derived resins, then the resin can be made sustainable, but batch-to-batch variability leads to inconsistent acid value and formation of unwanted side products
Solution Approach 1:
The patent applies parameter changes by carefully controlling the molar ratio of diol to diacid (using excess diol), maintaining specific temperature ranges (180-220°C), and controlling reaction time to achieve consistent acid values of 10-16 while minimizing side product formation. These parameter optimizations resolve the batch-to-batch variability issue.
Solution Approach 2:
The patent implements feedback control by monitoring the acid value during the polycondensation reaction and adjusting reaction conditions accordingly. This ensures the acid value remains within the target range of 10-16, improving batch consistency and reducing unwanted side products.
2Manufacturing precision
If additional reagents are added during polycondensation to control acid value, then the target acid value range can be achieved, but process time and material costs increase
Solution Approach 1:
The patent applies preliminary action by pre-calculating and preparing the exact stoichiometric ratio of diol to diacid (excess diol) before the reaction starts. This preliminary preparation eliminates the need for additional reagent additions during the reaction, reducing both process time and material costs while maintaining precise acid value control.
Solution Approach 2:
The patent changes the parameter of diol excess ratio to optimize the reaction outcome. By maintaining a specific excess of diol (molar ratio optimized before reaction), the process achieves target acid values without requiring additional reagent additions during reaction, thereby reducing process time and material waste.
3Adaptability or versatility
If polycondensation reactions are performed to create sustainable resins, then environmental sustainability is improved, but the process requires precise control to avoid batch variability
Solution Approach 1:
The patent simplifies process control by establishing fixed parameter ranges: diol to diacid molar ratio with excess diol, temperature range of 180-220°C, and specific reaction time durations. These predefined parameter changes reduce the complexity of real-time control while maintaining batch consistency and sustainability.
Solution Approach 2:
The patent reduces process control complexity through preliminary action by pre-determining the optimal diol excess ratio and reaction parameters before production. This preliminary setup creates a robust process that is less sensitive to variations, simplifying ongoing control requirements while maintaining sustainability.
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
This approach enables the production of sustainable resins with consistent acid value and reduced process time and costs, ensuring effective electrical performance and increased sustainability in toner production.
Implementation Method 1
the mixture is heated to enable polycondensation to form a polyester polymer
Implementation Method 2
AV is monitored to ensure the resin has an AV of from about 10 to about 16, among other parameters, and if the AV is above that range, the reaction temperature is increased to control the reaction and to reduce AV
Data Source
AI summary
The disclosure describes a process for making a polyester resin of defined acid value using a temperature-sensitive reaction and dipropylene glycol as a reagent.