DE2341392

1415768 Porous polymethylmethacrylate membrane TORAY INDUSTRIES Inc 16 Aug 1973 [16 Aug 1972 17 Feb 1973] 38720/73 Heading B5B [Also in Division C3] Hydrogel semi-permeable films and fibres are prepared from a mixture of isotactic and syndiotactic polymethylmethacrylates. The structures are prepared...

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Hauptverfasser:	FUJII, YOSHISHIGE, TANZAWA, HIROSHI, OTSU, SHIGA, MAEKAWA, HARUKI, KAMAKURA, KANAGAWA, MATSUSHITA, TAKAO, YUUSHUDAINISHI, CHIBA, SAKAI, YOSHITADA, SUGITA, KOUJI
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMISTRY COMPOSITIONS BASED THEREON COMPOSITIONS OF MACROMOLECULAR COMPOUNDS MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OFARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES ORRIBBONS METALLURGY NATURAL OR ARTIFICIAL THREADS OR FIBRES ORGANIC MACROMOLECULAR COMPOUNDS PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL SEPARATION SPINNING TEXTILES THEIR PREPARATION OR CHEMICAL WORKING-UP TRANSPORTING
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Zusammenfassung:	1415768 Porous polymethylmethacrylate membrane TORAY INDUSTRIES Inc 16 Aug 1973 [16 Aug 1972 17 Feb 1973] 38720/73 Heading B5B [Also in Division C3] Hydrogel semi-permeable films and fibres are prepared from a mixture of isotactic and syndiotactic polymethylmethacrylates. The structures are prepared by dissolving the mixture in a suitable solvent to form a sol, forming the sol into the desired shape, cooling it to form a gel and then replacing the solvent with water. Hollow fibres may be given by extruding through an annular orifice having an inner tube coaxial with the orifice by which a fluid is injected into the fibre. The fibre is then cooled to below the melting point of the gel by contact with a cooling gas, which is preferably the vapour of a coagulating liquid, and then coagulating the fibre by means of an aqueous non-solvent.