PREPARATION OF POLYIMIDE POLYMERS

A process for the preparation of a reactive friable polyimide powder comprises dissolving an aromatic dianhydride and an organic diamine in a high-boiling, aprotic organic solvent to form a reaction solution; heating the reaction solution under imidization conditions to form an insoluble reactive po...

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Bibliographische Detailangaben
1. Verfasser:	LINDWAY, MARTIN, JOHN
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	ADHESIVES CHEMICAL PAINT OR INK REMOVERS CHEMISTRY COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS COMPOSITIONS BASED THEREON COMPOSITIONS OF MACROMOLECULAR COMPOUNDS CORRECTING FLUIDS DYES FILLING PASTES INKS MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS ORGANIC MACROMOLECULAR COMPOUNDS PAINTS PASTES OR SOLIDS FOR COLOURING OR PRINTING POLISHES PREPARATION OF CARBON BLACK THEIR PREPARATION OR CHEMICAL WORKING-UP TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS,TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES USE OF MATERIALS THEREFOR WOODSTAINS
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Beschreibung
Zusammenfassung:	A process for the preparation of a reactive friable polyimide powder comprises dissolving an aromatic dianhydride and an organic diamine in a high-boiling, aprotic organic solvent to form a reaction solution; heating the reaction solution under imidization conditions to form an insoluble reactive polyimide and to effect substantially complete distillation of the water of reaction out of the reaction solution; and separating the insoluble reactive polyimide from the reaction solution to form a reactive friable polyimide powder. L'invention concerne un procédé de préparation d'une poudre de polyimide friable réactive. Ce procédé consiste à dissoudre un dianhydride aromatique et une diamine organique dans un solvant organique aprotique à point d'ébullition élevé de manière à former une solution de réaction, à chauffer cette solution de réaction dans des conditions d'imidisation de manière à former un polyimide réactif insoluble et à réaliser une distillation sensiblement complète de l'eau de réaction à partir de la solution de réaction, puis à séparer le polyimide réactif insoluble de la solution de réaction de façon à former une poudre de polyimide friable réactive.