PROCESS FOR PREPARING A THIN FILM AND APPARATUS THEREFOR

A process is disclosed for preparing a thin film having a large area. A casting solution comprising a film-forming material and a solvent is fed to the surface of a liquid substrate immiscible with the solution by utilizing a interfacial tension. Spontaneous spreading of the casting solution occurs...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	AOKI, TAKAO, KAWABE, NORIO
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULARARTICLES INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS PERFORMING OPERATIONS SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS TRANSPORTING WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Beschreibung
Zusammenfassung:	A process is disclosed for preparing a thin film having a large area. A casting solution comprising a film-forming material and a solvent is fed to the surface of a liquid substrate immiscible with the solution by utilizing a interfacial tension. Spontaneous spreading of the casting solution occurs across the surface of the liquid substrate and evaporation of the solvent produces the thin film on the liquid surface which is continuously collected. The feed of the casting solution to the surface of the substrate comprises at least either a material which shows selective wettability for the casting solution in preference to the liquid substrate or a structure capable of developing capillarity.