Polyetherimide varnish compositions, methods of manufacture, and articles prepared therefrom
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Solution Overview
Problem
There is a need for new methods of manufacturing polyetherimides for applications such as laminates, adhesives, coatings, and composites, as existing methods are limited in their versatility and efficiency.
Innovation Solution
A varnish comprising an isolated as-synthesized polyetherimide with a glass transition temperature of 180° C or more, a solvent, and an optional inorganic particulate composition is used, which is heated to dissolve the polyetherimide and then formed into articles through solvent removal, allowing for the creation of copper clad laminates and composites with enhanced thermal conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If polyetherimides are processed using conventional methods (injection molding, extrusion, thermoforming), then manufacturing efficiency is maintained, but versatility for new applications (laminates, adhesives, coatings, composites) is limited
Solution Approach 1:
The patent changes the physical state parameter of polyetherimide from solid resin to dissolved varnish form. By dissolving polyetherimide in solvents to create varnishes with controlled viscosity and composition, the material becomes adaptable for coating, laminating, and composite applications while maintaining processability through solvent removal and curing
Solution Approach 2:
The patent creates composite varnish formulations by combining polyetherimide with solvents, fillers, and other components. These composite varnishes enable new applications in laminates, adhesives, and composites while preserving the high-performance characteristics of polyetherimide
2Adaptability or versatility
If polyetherimide varnish is used for laminates and coatings, then application versatility is improved, but process complexity increases due to solvent removal and curing steps
Solution Approach 1:
The patent uses solvents as intermediary substances to enable processing. The solvent allows polyetherimide to be applied in varnish form for coating and laminating, then serves as a temporary component that is removed through evaporation or extraction, leaving the desired polyetherimide structure
Solution Approach 2:
The patent exploits phase transitions of the solvent (liquid to vapor) to simplify the process. By designing varnishes where the solvent can be removed through evaporation or extraction, the complex multi-step process is reduced to a single phase change operation
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 method enables the production of articles with improved thermal conductivity and versatility, suitable for various applications including printed circuit boards and composite materials, by leveraging the high heat resistance and chemical stability of polyetherimides.
Implementation Method 1
heating the components at a temperature and for a period of time effective to dissolve the polyetherimide in the solvent
Implementation Method 2
removing the solvent from the formed article
Data Source
AI summary
A varnish includes an isolated as-synthesized polyetherimide having a glass transition temperature of 180° C. or more, a solvent in an amount effective for the polyetherimide to remain in solution at a selected temperature, and an inorganic particulate composition wherein the amount of polyetherimide, inorganic particulate composition, and solvent total 100 wt %. Also disclosed is a method of manufacturing the varnish, articles prepared from the varnish, and methods of manufacturing such articles.