US4702836A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Porous fluorine resin membrane and process for preparing the same
Assignee: Asahi Kasei Corp
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Filing: 1986-07-11
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Granted: 1987-10-27
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Expires: 2006-07-11
Abstract
Abstract The invention relates to a porous membrane made of a particular fluorine resin, having excellent chemical resistance, excellent thermal resistance, excellent filtration performance and excellent mechanical properties, and having uniform porous structure comprising minute pores, and also relates to a process for preparing the same. In particular, the invention relates to a porous membrane suited for a microfilter having excellent thermal resistance and excellent filtration performance, especially a porous membrane suited for a microfilter for use in purification of chemicals such as strong acid and strong alkali by utilizing the excellent chemical resistance, and also a process for preparing the same.
Inventors
- 👤 Yoshihiko Mutoh
- 👤 Morikazu Miura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:27
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/26; B; B01; B01D; B01D67/00; B01D67/0002; B01D67/0023; B01D67/0025; B01D67/0027; B01D67/003; B01D71/00; B01D71/06; B01D71/30; B01D71/32; C08J2201/00; C08J2201/04; C08J2201/044; C08J2201/0442; C08J2323/00; C08J2323/02; C08J2323/04; C08J2323/08; C08J2327/00; C08J2327/02; C08J2327/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
85 words
A porous fluorine resin membrane comprising a fluorine resin selected from the group consisting of an ethylene-tetrafluoroethylene copolymer, an ethylene-chlorotrifluoroethylene copolymer and polychlorotrifluoroethylene, having a mean pore size of from 0.01 to 5μ and a porosity of 40 to 90%, and having a three dimensional network structure such that the symbol N designating the number of fibers constituted a network is N≧2p/D per 1 mm in the thicknesswise direction of the membrane, wherein p represents a porosity (%) and D represents mean pore side (μ).
Claim 2
Dependent Claim
85 words
A porous fluorine resin membrane comprising a fluorine resin selected from the group consisting of an ethylene-tetrafluoroethylene copolymer, an ethylene-chlorotrifluoroethylene copolymer and polychlorotrifluoroethylene, having a mean pore size of from 0.01 to 5μ and a porosity of 40 to 90%, and having a three dimensional network structure such that the symbol N designating the number of fibers constituted a network is N≧2p/D per 1 mm in the thicknesswise direction of the membrane, wherein p represents a porosity (%) and D represents mean pore side (μ).
Claim 3
Dependent Claim
32 words
The porous fluorine resin membrane according to claim 1, wherein the number N of fibers constituted the network is such that N≧5p/D per 1 mm in the thicknesswise direction of the membrane.
Claim 4
Dependent Claim
17 words
The porous fluorine resin membrane according to claim 1, wherein said porous membrane comprises a hollow fiber.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-10-26 | 1991-04-27 | 1991-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-26 | 1995-04-27 | 1995-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-26 | 1999-04-27 | 1999-10-27 | $7700.00 | Window Closed / Lapsed |