Patent EP0247597A1 successfully refreshed from Google Patents.
EP0247597A1
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EP
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Process for producing porous membranes
Assignee: Mitsubishi Chemical Corp
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Filing: 1987-05-27
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Granted: —
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Expires: 2007-05-27
Abstract
Abstract The process comprises the steps of dissolving a film-forming polymer in a good solvent for said polymer, forming a film of the resulting polymer solution, and forcibly contacting saturated steam or mist-containing steam with at least one surface of said film. The resulting porous membranes have pores having a narrow pore diameter distribution and extending in a direction substantially perpendicular to the membrane surface at a high surface pore density on at least one surface thereof. In another embodiment, the resulting porous membranes, although having no straight pores, are devoid of a nonporous layer.
Inventors
- 👤 Hajime Itoh
- 👤 Hiroshi Takahashi
- 👤 Kouji Ohbori
- 👤 Hideaki Habara
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 18:00
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/28; B; B01; B01D; B01D67/00; B01D67/0002; B01D67/0009; B01D67/0013; B01D67/0016; B01D69/00; B01D69/02; B01D69/06; B01D2323/00; B01D2323/12; B01D2325/00; B01D2325/02; B01D2325/022; C08J2201/00; C08J2201/04; C08J2201/05; C08J2201/0502; C08J2201/054; C08J2201/0542; C08J2201/0544; Y; Y10; Y10S; Y10S264/00; Y10S264/13
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
46 words
A process for producing porous membranes which comprises the steps of dissolving a film-forming polymer in a good solvent for said polymer, forming a film of the resulting polymer solution, and forcibly contacting saturated steam or mist-containing steam with at least one surface of said film.
Claim 2
Dependent Claim
46 words
A process for producing porous membranes which comprises the steps of dissolving a film-forming polymer in a good solvent for said polymer, forming a film of the resulting polymer solution, and forcibly contacting saturated steam or mist-containing steam with at least one surface of said film.
Claim 3
Dependent Claim
49 words
A process for producing porous membranes which comprises the steps of dissolving a film-forming polymer in a good solvent for said polymer, forming a film of the resulting polymer solution on a moving support body, and forcibly contacting saturated steam or mist-containing steam with the surface of said film.
Claim 4
Dependent Claim
49 words
A process for producing porous membranes which comprises the steps of dissolving a film-forming polymer in a good solvent for said polymer, forming a film of the resulting polymer solution on a moving support body, and forcibly contacting saturated steam or mist-containing steam with the surface of said film.
Claim 5
Dependent Claim
27 words
The process as claimed in Claim 1 or 2 wherein said good solvent has a water-solubility of not greater than 50 g per 100 g of water.
Claim 6
Dependent Claim
28 words
The process as claimed in claim 1 or 2 wherein said film-forming polymer is dissolved in the good solvent in the range of 2 to 40% by weight.
Claim 7
Dependent Claim
30 words
The process as claimed in claim 1 or 2 wherein said saturated steam or mist-containing steam is supplied feed rate of 0.1 to 1000 mg/sec per 1 cm² of film.
References Cited (Backward Citations)
US2783894A
Cited
DE1060357B
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GB993037A
Cited
FR2073530A5
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FR2090310A1
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FR2139087A1
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DE2743673A1
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EP0147570A2
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