Polyimide Precursor Composition Solvent Mixture
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Solution Overview
Problem
Polyimide resins are difficult to shape due to their high heat resistance and limited solubility in solvents, leading to surface unevenness and film defects in shaped articles, as they require high energy for solvent removal and are prone to moisture absorption, which causes precipitation and aggregation issues.
Innovation Solution
A polyimide precursor composition using a solvent mixture of a water-insoluble solvent and an alcohol solvent, which suppresses moisture absorption and reduces the differences in solvent concentration across the surface, thereby minimizing surface unevenness and film defects, while also reducing energy requirements for solvent removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If water-soluble ether or water-soluble ketone is used as main solvent, then polyimide precursor can be dissolved, but surface unevenness and film defects occur due to moisture absorption
Solution Approach 1:
The patent changes the solvent parameters by selecting water-insoluble ketones or ethers with specific molecular structures and properties. This parameter change prevents moisture absorption while maintaining polyimide precursor solubility, thereby eliminating surface unevenness and film defects in the shaped articles.
Solution Approach 2:
The patent employs readily available water-insoluble ketones and ethers as solvents that can be easily removed during the shaping process. These solvents serve their purpose of dissolving the polyimide precursor and are then eliminated, leaving no harmful residues that would cause surface defects.
2Quantity of substance
If ordinary aprotic polar solvents are used, then polyimide precursor dissolves well, but high energy is required for solvent removal due to high boiling points
Solution Approach 1:
The patent changes the boiling point parameter of the solvent by selecting water-insoluble ketones or ethers with lower boiling points compared to ordinary aprotic polar solvents. This parameter change reduces the energy required for solvent removal during the shaping process while maintaining adequate solubility of the polyimide precursor.
3Ease of manufacture
If polyimide resin is shaped by melting, then shaping is possible, but the process is difficult due to high heat resistance
Solution Approach 1:
The patent applies preliminary action by dissolving the polyimide precursor in a water-insoluble ketone or ether solvent before the shaping process. This preliminary dissolution creates a workable composition that can be easily shaped at lower temperatures, avoiding the need to overcome the high heat resistance of the polyimide resin through melting.
4Quantity of substance
If limited number of solvents are used to dissolve polyimide precursor, then solubility is achieved, but variety of solvent choices is restricted
Solution Approach 1:
The patent establishes universality by identifying water-insoluble ketones and ethers as a functional class of solvents that can all dissolve polyimide precursors effectively. This universal solvent class expands the available options beyond traditional aprotic polar solvents, providing versatility in solvent selection while maintaining solubility and preventing moisture-related defects.
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 composition achieves high uniformity and stability in polyimide shaped articles by preventing moisture absorption and precipitation, resulting in improved film formability and reduced energy consumption during production.
Implementation Method 1
a solvent mixture containing a water-insoluble solvent and an alcohol solvent... which suppresses moisture absorption
Implementation Method 2
reduces the differences in solvent concentration across the surface, thereby minimizing surface unevenness
Data Source
AI summary
A polyimide precursor composition includes a solvent mixture containing an alcohol solvent and a water-insoluble solvent that is at least one selected from the solvent group consisting of water-insoluble ketones and water-insoluble ethers; and a polyimide precursor dissolved in the solvent mixture.