Polyhydroxyimide Production via Acid-Catalyzed Imidization
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Solution Overview
Problem
Current methods for producing polyhydroxyimide, such as thermal and chemical imidization, are inefficient and unsuitable for industrial production due to high temperatures, long processing times, and the need for azeotropic dehydration and bases, which deactivate the hydroxy group essential for photosensitive applications.
Innovation Solution
A method involving the addition of a weak acid like acetic acid to a polyhydroxyamic acid precursor, allowing for polyhydroxyimide production at temperatures below 100°C without the need for azeotropic dehydration or bases, thereby preserving the hydroxy group's functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If chemical imidization method is used with dehydrocondensing agent and ring-closure catalyst, then imidization reaction proceeds efficiently, but hydroxy group is converted to acetoxy group and deactivated
Solution Approach 1:
The patent changes the chemical environment parameters by replacing the traditional base-catalyzed system with an acid-catalyzed system using carboxylic acids. This parameter change prevents the hydroxy group deactivation that occurs with base catalysts while maintaining efficient imidization reaction through acid catalysis mechanisms
Solution Approach 2:
The patent introduces carboxylic acids as intermediary catalysts that mediate the imidization reaction without causing side reactions with hydroxy groups. These acid catalysts facilitate the cyclization process while preserving the photosensitive hydroxy group functionality, acting as a beneficial intermediary between the polyamic acid and polyimide formation
2Reliability
If thermal imidization method is used with high temperature heating, then imidization reaction is achieved, but processing time is long and energy consumption is high
Solution Approach 1:
The patent replaces the thermal energy-driven imidization process with a chemically-catalyzed process using carboxylic acids. This substitution allows the reaction to proceed at lower temperatures and shorter times by using chemical catalysis rather than relying solely on thermal energy input
Solution Approach 2:
The patent changes the temperature and time parameters by introducing acid catalysis. The reaction can be completed at lower temperatures (avoiding high-temperature heating) and in shorter durations, significantly reducing processing time and energy consumption while maintaining complete imidization
3Productivity
If azeotropic dehydration is used to remove water, then imidization reaction is promoted, but process complexity increases and costs increase
Solution Approach 1:
The patent extracts and eliminates the complex azeotropic dehydration step from the traditional imidization process. By using acid catalysis with carboxylic acids, water removal is simplified and integrated into the reaction system without requiring separate azeotropic dehydration equipment or procedures
Solution Approach 2:
The carboxylic acid catalyst system provides self-service functionality by facilitating both the imidization reaction and water management within the same reaction vessel. The acid catalyst promotes water elimination as part of the cyclization mechanism itself, eliminating the need for external azeotropic dehydration systems
4Productivity
If base catalyst is used for imidization, then reaction efficiency is improved, but hydroxy group is deactivated and photosensitive properties are lost
Solution Approach 1:
The patent inverts the traditional approach by using acid catalysis instead of base catalysis. This inversion reverses the chemical environment from basic to acidic, which prevents hydroxy group deactivation while still achieving efficient imidization through the alternative acid-catalyzed mechanism
Solution Approach 2:
The patent converts the potential harm of acid-base reactions that would normally affect hydroxy groups into a beneficial outcome. By using carboxylic acids, the acid catalysis promotes imidization while the acid environment actually protects rather than deactivates the photosensitive hydroxy groups, turning a potentially harmful chemical environment into a beneficial one
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 simplifies the production process, reduces costs, and maintains the hydroxy group's reactivity, enabling the use of polyhydroxyimide in high-resolution, high-sensitivity photosensitive resin compositions.
Implementation Method 1
adding an acid component that is at least one type of carboxylic acid having a pKa of 0 to 5 to a polyhydroxyimide precursor; and heating the resultant mixture to a temperature of 50 to 100° C. to effect a reaction
Data Source
AI summary
There is provided a simple production method of polyhydroxyimide and a positive photosensitive resin composition containing the polyhydroxyimide. A production method of a polyhydroxyimide comprising: adding an acid component that is at least one type of carboxylic acid having a pKa of 0 to 5 to a polyhydroxyimide precursor of Formula (1):(where X is a tetravalent aliphatic or aromatic group, Y is an organic group containing an aromatic group substituted with at least one OH group, and n is an integer of 1 or more); and heating the resultant mixture to a temperature of 50 to 100° C. to prepare a poly imide of Formula (2):(where X, Y and n are the same as those defined above) having a weight average molecular weight of 3,000 to 100,000.