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1. (WO1992009357) LIQUID-FILTERING FILM AND FILTERING DEVICE USING SAID FILM
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1992/009357 International Application No.: PCT/JP1991/001676
Publication Date: 11.06.1992 International Filing Date: 29.11.1991
IPC:
B01D 67/00 (2006.01) ,B01D 69/02 (2006.01) ,B29C 59/14 (2006.01)
B PERFORMING OPERATIONS; TRANSPORTING
01
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
D
SEPARATION
67
Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
B PERFORMING OPERATIONS; TRANSPORTING
01
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
D
SEPARATION
69
Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
02
characterised by their properties
B PERFORMING OPERATIONS; TRANSPORTING
29
WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
C
SHAPING OR JOINING OF PLASTICS; SHAPING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL; AFTER- TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
59
Surface shaping, e.g. embossing; Apparatus therefor
14
by plasma treatment
Applicants:
NITTO DENKO CORPORATION [JP/JP]; 1-2, Shimohozumi 1-chome Ibaraki-shi Osaka 567, JP (AllExceptUS)
URAIRI, Masakatsu [JP/JP]; JP (UsOnly)
MATSUMOTO, Kenji [JP/JP]; JP (UsOnly)
Inventors:
URAIRI, Masakatsu; JP
MATSUMOTO, Kenji; JP
Agent:
HAGINO, Taira; Eikoh Patent Office 14th Floor, Toranomon-Mitsui Building 8-1, Kasumigaseki 3-chome Chiyoda-ku Tokyo 100, JP
Priority Data:
2/33431029.11.1990JP
Title (EN) LIQUID-FILTERING FILM AND FILTERING DEVICE USING SAID FILM
(FR) PELLICULE DE FILTRATION DE LIQUIDE ET DISPOSITIF DE FILTRATION UTILISANT CETTE PELLICULE
Abstract:
(EN) A liquid-filtering film to be used for precision filtration or ultrafiltration of liquid such as medicine and water; and a filtering device using said film. This film is obtained through the processes of exposure thereof to the atmosphere of 25 °C and 60 % RH for 8 hours, of wetting treatment with liquid low in surface tension, and of substituting said liquid with pure water so as to make the film hydrophilic, in which pure water permeating fluxes has decreased 20 % or under from those for the film before exposure. Such hydrophilic filtering film as above can be made of, for example, a PTFE porous film subjected to low-temperature plasma treatment at the surface thereof and made hydrophilic under the condition that the product of high frequency output density and treatment period of time amounts to 0.5 to 50 W.sec/cm2 and the total pressure of gas amounts to 0.01 to 10 torr.
(FR) L'invention concerne une pellicule de filtration de liquide utilisée pour la filtration ou ultrafiltration précise de liquide tel que des liquides médicaux et de l'eau, ainsi qu'un dispositif de filtration utilisant cette pellicule. Cette pellicule est obtenue par l'intermédiaire de processus d'exposition de la pellicule dans des conditions d'atmosphère de 25 °C et 60 % RH pendant 8 heures, de traitement par mouillage avec un liquide de faible tension superficielle, et de substitution de ce liquide par de l'eau pure de manière à produire la pellicule hydrophile permettant une diminution d'au moins 20 % des flux de perméation de l'eau pure par rapport aux taux de perméation possibles avant exposition de ladite pellicule. Cette pellicule de filtration hydrophile peut être fabriquée avec, par exemple, une pellicule poreuse en PTFE soumise à un traitement au plasma à basse température au niveau de sa surface et rendue hydrophile à condition que le produit de la densité de sortie de haute fréquence et de la période de temps de traitement ait une valeur comprise entre 0,05 et 50 W.sec/cm2 et que la pression totale du gaz soit comprise entre 0,01 et 10 torr.
Designated States: JP, US
European Patent Office (AT, BE, CH, DE, DK, ES, FR, GB, GR, IT, LU, NL, SE)
Publication Language: Japanese (JA)
Filing Language: Japanese (JA)
Also published as:
EP0513389US5282965