US4125451A
Expired / Lapsed
US
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Diaphragms from discrete thermoplastic fibers requiring no bonding or cementing
Assignee: BASF Corp
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Filing: 1977-04-27
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Granted: 1978-11-14
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Expires: 1997-04-27
Abstract
Abstract Diaphragms for electrolytic cells are prepared by depositing onto a cathode screen, discrete thermoplastic fibers. The fibers are highly branched, and when deposited, form an entanglement or network thereof, which does not require bonding or cementing.
Inventors
- 👤 Arvind S. Patil
- 👤 Eugene Yehuda Weissman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:54
CPC Classifications
C; C25; C25B; C25B13/00; C25B13/04; C25B13/08
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
92 words
In an electrolytic cell having a diaphragm deposited on a cathode screen, an improved diaphragm therefor, said diaphragm consisting essentially of an entanglement of highly branched thermoplastic polymeric fibers, the fibers being capable of withstanding the internal conditions of the cell, the fibers being of the type produced by passing a polymer through a nozzle under high-energy conditions in the presence of an auxiliary liquid medium which shears the polymer into highly branched fibers, and wherein fibers are entangled to a degree such that they are free from bonding or cementing agents.
Claim 2
Dependent Claim
92 words
In an electrolytic cell having a diaphragm deposited on a cathode screen, an improved diaphragm therefor, said diaphragm consisting essentially of an entanglement of highly branched thermoplastic polymeric fibers, the fibers being capable of withstanding the internal conditions of the cell, the fibers being of the type produced by passing a polymer through a nozzle under high-energy conditions in the presence of an auxiliary liquid medium which shears the polymer into highly branched fibers, and wherein fibers are entangled to a degree such that they are free from bonding or cementing agents.
Claim 3
Dependent Claim
19 words
The improvement of claim 1 wherein the highly branched thermoplastic fibers are utilized in admixture with a wetting agent.
Claim 4
Dependent Claim
27 words
An improved diaphragm according to claim 1 wherein the branched thermoplastic fiber selected from the group consisting of polyolefins, polycarbonates, polyesters, polyamides, fluorinated hydrocarbons, and mixtures thereof.
Claim 5
Dependent Claim
15 words
The improved diaphragm of claim 1 wherein the branched thermoplastic fiber is a fluorinated hydrocarbon.
Claim 6
Dependent Claim
14 words
The improved diaphragm of claim 1 wherein the branched thermoplastic fiber is polyvinylidene fluoride.
Claim 7
Dependent Claim
21 words
The improved diaphragm of claim 1 wherein the fibers have a diameter of from about 0.1 micron to about 40 microns.
Claim 8
Dependent Claim
14 words
The improved diaphragm of claim 1, wherein the electrolytic cell is a chlor-alkali cell.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-11-13 | 1982-05-15 | 1982-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-13 | 1986-05-15 | 1986-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-13 | 1990-05-15 | 1990-11-14 | $7700.00 | Window Closed / Lapsed |