PROCEDE DE PREPARATION DE PELLICULES ULTRA-FINES EN POLYMERE DE METHYL-PENTENE

L'invention consiste à déposer, sur la surface d'un substrat de coulage liquide, une quantité de solution de coulage renfermant le polymère de méthyl-pentène et capable de se répandre spontanement sur cette surface, puis à laisser la solution de coulage ainsi déposée se désolvater, laissan...

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Bibliographische Detailangaben
1. Verfasser:	SHIRO GENE KIMURA, RAYMOND GEORGE LAVIGNE ET WARELLA RACELA BROWALL
Format:	Patent
Sprache:	fre
Schlagworte:	AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING CHEMISTRY COMPOSITIONS BASED THEREON COMPOSITIONS OF MACROMOLECULAR COMPOUNDS GENERAL PROCESSES OF COMPOUNDING MAKING GRANULES OR PREFORMS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL PREPARATION OR PRETREATMENT OF THE MATERIAL TO BESHAPED PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCESIN A PLASTIC STATE RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIALCONTAINING PLASTICS SEPARATION SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS THEIR PREPARATION OR CHEMICAL WORKING-UP TRANSPORTING WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL WORKING-UP
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Beschreibung
Zusammenfassung:	L'invention consiste à déposer, sur la surface d'un substrat de coulage liquide, une quantité de solution de coulage renfermant le polymère de méthyl-pentène et capable de se répandre spontanement sur cette surface, puis à laisser la solution de coulage ainsi déposée se désolvater, laissant une mince pellicule solide flottant sur la surface. Elle trouve son application dans la fabrication de membranes pour dispositifs séparateurs de gaz. An improved method is described for solvent casting ultrathin non-porous methylpentene polymer films. The casting solution comprises methylpentene polymer of a mixture thereof with organopolysiloxane-polycarbonate copolymer dissolved in a solvent system and is characterized by being able to spontaneously spread over the surface of the liquid casting substrate. In a preferred embodiment, large-area films less than 200 Angstroms in thickness may be repeatedly formed. The solidified films remain relatively free of tensile stress during formation. The casting solution is deposited in a narrow, longitudinally-extending defined region at the surface of the casting substrate. The surface area and perimeter of the defined region are enlarged over the surface of the casting substrate in a manner whereby the casting solution is moved relative to the casting substrate and, after desolvation, the polymer film formed remains stationary relative to the casting substrate and relatively free of tensile stress. The films are useful as semipermeable membranes for selectively removing oxygen gas from mixtures thereof with nitrogen gas.