Patent US4170539A successfully refreshed from Google Patents.
US4170539A
Expired / Lapsed
US
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Diaphragm having zirconium oxide and a hydrophilic fluorocarbon resin in a hydrophobic matrix
Assignee: PPG Industries Inc
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Filing: 1978-10-20
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Granted: 1979-10-09
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Expires: 1998-10-20
Abstract
Abstract Disclosed is a diaphragm having a porous, hydrophobic fluorocarbon matrix, an intermediate layer or film of a hydrophilic fluorocarbon resin on the surfaces of the matrix, and a hydrous oxide of zirconium contained in the void volumes of the matrix. The layer of the hydrous oxide of zirconium may also contain MgO.
Inventors
- 👤 Robert B. Simmons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:26
CPC Classifications
C; C25; C25B; C25B13/00; C25B13/04; C25B13/05; C25B13/07; C25B13/08
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
47 words
In a method of preparing a diaphragm comprising depositing a hydrous oxide of zirconium in a porous, hydrophobic fluorocarbon matrix, the improvement comprising first depositing a hydrophilic fluorocarbon resin on the surface of the porous fluorocarbon matrix and thereafter depositing the hydrous oxide in the fluorocarbon matrix.
Claim 2
Dependent Claim
47 words
In a method of preparing a diaphragm comprising depositing a hydrous oxide of zirconium in a porous, hydrophobic fluorocarbon matrix, the improvement comprising first depositing a hydrophilic fluorocarbon resin on the surface of the porous fluorocarbon matrix and thereafter depositing the hydrous oxide in the fluorocarbon matrix.
Claim 3
Dependent Claim
18 words
The method of claim 1 wherein the hydrophilic fluorocarbon resin is a perfluorinated hydrocarbon having pendant acid groups.
Claim 4
Dependent Claim
24 words
The method of claim 2 wherein the pendant acid groups are chosen from the group consisting of --SO 3 H, --COOH, and derivatives thereof.
Claim 5
Dependent Claim
22 words
The method of claim 1 comprising contacting the fluorocarbon body with a solution containing the hydrophilic fluorocarbon resin and removing the solvent.
Claim 6
Dependent Claim
24 words
The method of claim 1 comprising depositing from about 0.1 to about 20 weight percent hydrophilic resin, basis weight of the porous fluorocarbon body.
Claim 7
Dependent Claim
42 words
A diaphragm for a chlor-alkali electrolytic cell comprising: a porous, hydrophobic, fluorocarbon matrix; a film of a hydrophilic fluorocarbon resin on the surfaces of the porous matrix; and a hydrous oxide of zirconium atop the hydrophilic fluorocarbon resin in the porous matrix.
Claim 8
Dependent Claim
42 words
A diaphragm for a chlor-alkali electrolytic cell comprising: a porous, hydrophobic, fluorocarbon matrix; a film of a hydrophilic fluorocarbon resin on the surfaces of the porous matrix; and a hydrous oxide of zirconium atop the hydrophilic fluorocarbon resin in the porous matrix.
Claim 9
Dependent Claim
18 words
The diaphragm of claim 6 wherein the hydrophilic fluorocarbon resin is a perfluorinated hydrocarbon having pendant acid groups.
Claim 10
Dependent Claim
24 words
The diaphragm of claim 7 wherein the pendant acid groups are chosen from the group consisting of --COOH, --SO 3 H, and derivatives thereof.
Claim 11
Dependent Claim
40 words
The diaphragm of claim 6 wherein the diaphragm contains from about 0.5 to about 250 weight percent hydrous oxide of zirconium and from about 0.1 to about 20 weight percent hydrophilic resin, basis weight of the porous, hydrophobic fluorocarbon matrix.
Claim 12
Dependent Claim
22 words
The diaphragm of claim 6 wherein said diaphragm contains magnesium oxide and a hydrous oxide of zirconium atop the hydrophilic fluorocarbon resin.
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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) | 1982-10-08 | 1983-04-09 | 1983-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-08 | 1987-04-09 | 1987-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-08 | 1991-04-09 | 1991-10-09 | $7700.00 | Window Closed / Lapsed |