Polyimide Film Gloss Reduction via Embossed Gel Phase Separation
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Solution Overview
Problem
Existing methods for reducing the gloss of polyimide films either increase material costs or compromise the mechanical strength of the film.
Innovation Solution
A method involving the formation of a polyimide gel film using a specific diamine and diacid anhydride composition, followed by embossing with a concave and convex roller and subsequent baking to achieve a polyimide film with reduced gloss while maintaining mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If particles are added as a matting agent to reduce gloss, then the gloss of polyimide film is reduced, but material cost increases and mechanical strength decreases
Solution Approach 1:
The invention extracts and removes the matting agent particles from the polyimide film composition entirely. Instead of adding external particles, the patent uses the polyimide resin itself to form the concave-convex surface structure through controlled phase separation during curing, eliminating the need for matting agents and preserving the film's mechanical strength while achieving the desired low-gloss effect
Solution Approach 2:
The invention changes the physical and chemical parameters of the polyimide resin system by selecting specific resin combinations (thermosetting polyimide resin with thermoplastic polyimide resin in specific ratios) and controlling curing conditions (temperature, time, atmosphere) to induce controlled phase separation and form concave-convex surface structures, thereby achieving gloss reduction through parameter optimization rather than additive incorporation
2Shape
If cyclized polyimide resin is used for embossing, then a concave-convex surface can be formed, but the mechanical properties and strength of the film deteriorate
Solution Approach 1:
The invention uses a composite resin system consisting of thermosetting polyimide resin (5-40 wt%) and thermoplastic polyimide resin (60-95 wt%). The thermoplastic polyimide resin provides excellent mechanical strength and processability, while the thermosetting component enables controlled phase separation and concave-convex surface formation during curing. This composite approach allows the film to maintain high mechanical properties while achieving the desired surface morphology for gloss reduction
3Illumination intensity
If a large amount of matting agent is added to reduce gloss, then the gloss is reduced, but the polyimide film becomes brittle
Solution Approach 1:
The invention completely eliminates the need for matting agents by using the polyimide resin itself to form the light-scattering concave-convex surface structure. This extraction of harmful additives prevents the film from becoming brittle while maintaining the desired low-gloss appearance, as the surface structure is formed through controlled phase separation rather than through the incorporation of brittle particle fillers
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 effectively reduces the gloss of polyimide films while preserving their mechanical properties, offering a cost-effective solution for applications requiring low-gloss films.
Implementation Method 1
providing a diamine and a diacid anhydride for polymerization in a solvent to form a polyimide precursor solution
Implementation Method 2
adding 2-5 equivalents of a dehydrating agent and a catalyst into the polyimide precursor solution
Implementation Method 3
adding 2-5 equivalents of a dehydrating agent and a catalyst into the polyimide precursor solution
Implementation Method 4
providing an embossing wheel to roll the polyimide gel film peeled from the carrier at a temperature of 140-200° C. and a pressure of 3-10 Kgf/cm2 to form a concave and convex shape on a surface of the polyimide gel film
Implementation Method 5
baking the polyimide gel film to form a polyimide film with a 60° gloss of less than 100 GUs
Data Source
AI summary
The present invention provides a method for manufacturing a polyimide film with a reduced gloss, which comprises providing a diamine and a diacid anhydride for polymerization in a solvent to form a polyimide precursor solution; adding 2-5 equivalents of a dehydrating agent and a catalyst into the polyimide precursor solution and then coating a carrier with the polyimide precursor solution to form a polyimide gel film; providing an embossing wheel to roll the polyimide gel film peeled from the carrier at a temperature of 140-200° C. and a pressure of 3-10 Kgf/cm2 to form a concave and convex shape on a surface of the polyimide gel film; and baking the polyimide gel film to form a polyimide film with a 60° gloss of less than 100 GUs.