POLYIMIDE FILM AND METHOD FOR PRODUCING THE SAME

PROBLEM TO BE SOLVED: To produce a polyimide film useful as a film material for forming a product or member from which heat resistance, transparency and high dimensional stability before and after heating are required.SOLUTION: In a method for producing a transparent polyimide film, a polyimide film...

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1. Verfasser:	KIKUSAWA AKIRA
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G CHEMISTRY COMPOSITIONS BASED THEREON GENERAL PROCESSES OF COMPOUNDING MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-UP WORKING-UP
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To produce a polyimide film useful as a film material for forming a product or member from which heat resistance, transparency and high dimensional stability before and after heating are required.SOLUTION: In a method for producing a transparent polyimide film, a polyimide film is subjected to annealing treatment. By the annealing treatment, transparent polyimide, wherein a linear thermal expansion coefficient is ≤10 ppm, total light transmittance is ≥80%, and a dimensional change rate before and after heating at 200°C for 30 minutes is within ±0.020%, is obtained.