POLYIMIDES HAVING HIGH Tg, HIGH TOS, AND LOW MOISTURE REGAIN

Polyimide polymers from 3,4,3',4'-biphenyltetracarboxylic dianhydride and 3,4,3',4'-benzophenonetetracarboxylic dianhydride and a diamine such as p-phenylenediamine exhibit a high glass transition temperature, high thermal oxidative stability and low moisture regain, useful for s...

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Bibliographische Detailangaben
Hauptverfasser:	TANIKELLA, MURTY, S, PRATTE, JAMES, F
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G CHEMISTRY COMPOSITIONS BASED THEREON 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 ORGANIC MACROMOLECULAR COMPOUNDS PERFORMING OPERATIONS THEIR PREPARATION OR CHEMICAL WORKING-UP TRANSPORTING WORKING-UP
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Beschreibung
Zusammenfassung:	Polyimide polymers from 3,4,3',4'-biphenyltetracarboxylic dianhydride and 3,4,3',4'-benzophenonetetracarboxylic dianhydride and a diamine such as p-phenylenediamine exhibit a high glass transition temperature, high thermal oxidative stability and low moisture regain, useful for structural applications. Cette invention se rapporte à des polymères polyimides composés de dianhydride 3,4,3',4'-biphényltétracarboxylique, de dianhydride 3,4,3',4'-benzophénonetétracarboxylique et d'une diamine du type p-phénylènediamine, qui possèdent une température de transition vitreuse (Tg) élevée, une forte stabilité à l'oxydation thermique (TOS) et un faible taux de reprise d'humidité. Ces polymères polyimides s'avèrent utiles à la fabrication de matériaux structuraux.