Polyamic Acid Liquid Production Without Insoluble Salt Precipitates
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Solution Overview
Problem
Existing methods struggle to efficiently produce polyamic acid-containing liquids from which polyimides with excellent permittivity properties can be obtained, particularly when using aliphatic or alicyclic diamines, due to the formation of precipitates and poor reaction progression.
Innovation Solution
A method involving the use of an amic acid prepolymer containing structures derived from aromatic or aliphatic/alicyclic diamines and tetracarboxylic dianhydrides, with specific conditions to suppress the formation of insoluble salts and promote polymerization, enabling the production of a polyamic acid-containing liquid with high turbidity and component content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If aliphatic or alicyclic diamines are used in polyamic acid production, then polyimide with excellent permittivity properties can be obtained, but precipitates form and reaction progression is poor
Solution Approach 1:
The patent introduces a solvent as an intermediary medium to facilitate the reaction between aliphatic or alicyclic diamines and tetracarboxylic dianhydride. The solvent prevents direct contact between reactants that would form insoluble salts, enabling smooth reaction progression while maintaining the desired permittivity properties of the final polyimide.
Solution Approach 2:
The patent changes the physical state parameters of the reaction system by using a solvent to create a liquid phase reaction medium. This parameter change from solid/liquid interface reaction to homogeneous liquid phase reaction eliminates precipitate formation and improves reaction progression while preserving the excellent permittivity properties.
2Productivity
If polyamic acid is produced with high component content, then production efficiency improves, but turbidity increases
Solution Approach 1:
The solvent acts as a mediator that allows high component content to be maintained in the liquid phase without causing turbidity. It keeps the polyamic acid and related species in soluble form, enabling high productivity while maintaining clear, low-turbidity liquid suitable for further processing.
Solution Approach 2:
The patent changes the solubility parameter of the reaction system by introducing a solvent, allowing high concentrations of polyamic acid components to remain in solution. This parameter change enables both high production efficiency and low turbidity simultaneously.
3Device complexity
If conventional polyamic acid production methods are used, then process simplicity is maintained, but film-forming properties are poor
Solution Approach 1:
The patent changes the physical parameters of the polyamic acid product by producing it in a solvent-based liquid phase with controlled composition. This creates a homogeneous liquid that forms uniform films, improving film-forming properties while maintaining relatively simple processing steps.
Solution Approach 2:
The patent creates a composite liquid system containing polyamic acid, solvent, and controlled amounts of reactants. This composite formulation provides both the simplicity of a liquid process and the superior film-forming properties needed for high-frequency applications.
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 allows for the easy production of a polyamic acid-containing liquid that can yield polyimides with excellent permittivity and film-forming properties, suitable for insulating materials and printed boards.
Implementation Method 1
a polyamic acid-containing liquid that contains a polyamic acid... by using a prepolymer-containing liquid that contains an amic acid prepolymer including a structure derived from an aromatic diamine and a structure derived from a tetracarboxylic dianhydride
Implementation Method 2
a mass ratio of a polyimide obtained by heating a filtrate of the polyamic acid-containing liquid
Data Source
AI summary
The disclosure relates to a method for producing a polyamic acid-containing liquid, including obtaining a polyamic acid-containing liquid that contains a polyamic acid, by using a prepolymer-containing liquid containing an amic acid prepolymer, a diamine, and a tetracarboxylic dianhydride.