Liquid purification or separation – Filter – Material
Patent
1990-04-17
1991-12-31
Dawson, Robert A.
Liquid purification or separation
Filter
Material
21050027, 21050039, 521 50, 521 61, B01D 3321, C08J 900
Patent
active
050769251
ABSTRACT:
The invention relates to a process for preparing a microporous membrane, starting from a mixture of at least a hydrophobic polymer and a hydrophilic polymer, by dissolving these polymers first in a suitable solvent or mixture of solvents and subsequently by coagulating in a coagulation bath. According to the invention a more or less hydrophilic membrane is prepared by removing the membrane so obtained from the coagulation bath and subsequently by leaching at least a part of the hydrophilic polymer from the matrix, alternatively followed by hydrophobization. Said leaching of the hydrophilic polymer occurs by treatment of the membrane with an oxidizing/hydrolizing agent. The invention furthermore comprises microporous membranes, flat or tubular or in the form of hollow fibers, having a good chemical resistance and good mechanical strength.
REFERENCES:
patent: 3957651 (1976-05-01), Kesting
patent: 4664669 (1987-05-01), Ohyabu et al.
patent: 4798847 (1989-06-01), Roesink et al.
Patent Abstracts of Japan, vol. 12, No. 398, Oct. 21, 1988, p. 83 C 538; & JP-A-63 141 610 (Fuji Photo Film Co., Ltd.), 14-06-88.
Database WPILm AN 88-202856, Derwent Publication, London, GB; & Chemical Abstracts, vol. 109, No. 18, Oct. 31, 1988, p. 75, Abstract nr 151087d, Sasaki Jun et al., "Preparation of Microporous Polysulphone Membranes" *Abstract*.
Patent Abstracts of Japan, vol. 12, No. 338, Sep. 12, 1988, p. 30 C 527, & JP-A-63 97 202 (Toray Ind. Inc.) 27-04-1988.
Database WPIL, Derwent Publ. London, GB, AN 88.157690 *Abstract*.
Patent Abstracts of Japan, vol. 11, No. 85, Mar. 14, 1987, p. 85 C 410, & JP-A-61 238 834 (Toray Ind. Inc.), 24.varies.10-1986 & Database WPIL, Derwent Publications, London, GB AN-86-322277 *Abstract*.
Koenhen Dirk M.
Mulder Marcellinus H. V.
Roesink Hendrik D. W.
Smolders Cornelis A.
Dawson Robert A.
Fortuna Ana
X-Flow B.V.
LandOfFree
Process for preparing a microporous membrane and such a membrane does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for preparing a microporous membrane and such a membrane, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for preparing a microporous membrane and such a membrane will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1507897