LOW-COLOR POLYMERS FOR USE IN ELECTRONIC DEVICES

Disclosed is a polyimide film that exhibits: an in-plane coefficient of thermal expansion (CTE) that is less than 75 ppm/° C. between 50° C. and 250° C.; a glass transition temperature (Tg) that is greater than 250° C. for the polyimide film cured at 260° C. in air; a 1% TGA weight loss temperature...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	Auman, Brian C, Ngai, Chai Kit, Li, Wei, Radu, Nora Sabina, Summers, John Donald, Atkinson, Wayne, Maeyer, Jonathan Timothy
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G 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 FREQUENCY-CHANGING GENERAL PROCESSES OF COMPOUNDING 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 PHYSICS TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF THEIR PREPARATION OR CHEMICAL WORKING-UP WORKING-UP
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Beschreibung
Zusammenfassung:	Disclosed is a polyimide film that exhibits: an in-plane coefficient of thermal expansion (CTE) that is less than 75 ppm/° C. between 50° C. and 250° C.; a glass transition temperature (Tg) that is greater than 250° C. for the polyimide film cured at 260° C. in air; a 1% TGA weight loss temperature that is greater than 450° C.; a tensile modulus that is between 1.5 GPa and 5.0 GPa; an elongation to break that is greater than 20%; an optical retardation at 550 nm that is less than 100 nm for a 10-μm film; a birefringence at 633 nm that is less than 0.002; a haze that is less than 1.0%; a b* that is less than 3; a yellowness index that is less than 5; and an average transmittance between 380 nm and 780 nm that is greater than 88%.