POLYIMIDE FILM AND METHOD FOR PRODUCING THE SAME

PROBLEM TO BE SOLVED: To provide a polyimide film with biaxial optical anisotropy and excellent in durability. SOLUTION: A solution of a polyimide with an imidization ratio of 98-100% is applied on a plastic base material and the solution is dried to form a polyimide film. The polyimide film is stre...

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Hauptverfasser:	HAYASHI MASAKI, NISHIKOJI YUICHI, MURAKAMI NAHO, SAKAMOTO YUKIE
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G BASIC ELECTRIC ELEMENTS CHEMISTRY COMPOSITIONS BASED THEREON DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING ELECTRIC HEATING ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR ELECTRICITY FREQUENCY-CHANGING GENERAL PROCESSES OF COMPOUNDING LAYERED PRODUCTS LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS METALLURGY NON-LINEAR OPTICS OPTICAL ANALOGUE/DIGITAL CONVERTERS OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS OPTICAL LOGIC ELEMENTS OPTICS ORGANIC MACROMOLECULAR COMPOUNDS PERFORMING OPERATIONS PHYSICS SEMICONDUCTOR DEVICES TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF THEIR PREPARATION OR CHEMICAL WORKING-UP TRANSPORTING WORKING-UP
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a polyimide film with biaxial optical anisotropy and excellent in durability. SOLUTION: A solution of a polyimide with an imidization ratio of 98-100% is applied on a plastic base material and the solution is dried to form a polyimide film. The polyimide film is stretched together with the plastic base material so that the film has a state of nx>ny>nz, wherein nx denotes the refractive index in the direction where a refractive index is the largest within a plane, ny denotes the refractive index in the direction perpendicular to the direction of nx within the plane, and nz is the refractive index in the direction of thickness. The polyimide is preferably a fluorine-based polyimide since it is excellent in light transmittance and solubility, and preferably has a weight average molecular weight of 50,000-180,000. In addition, the polyimide solution preferably comprises a solvent with a solubility parameter in the range of 17-22 at a measurement condition of an atmospheric pressure of 1 atm and an atmospheric temperature of 25°C. COPYRIGHT: (C)2004,JPO&NCIPI