US4432860A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Porous diaphragm for electrolytic cell
Assignee: Chloe Chimie SA
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Filing: 1982-05-14
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Granted: 1984-02-21
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Expires: 2002-05-14
Abstract
Abstract A porous diaphragm for an electrolytic cell enables, e.g., the electrolysis of NaCl to NaOH, in high concentration and in good yield, said diaphragm comprising an electrolytically acceptable porous sheet member having a total pore volume and average equivalent pore diameter adapted for electrolysis, and having an ion exchange resin fixedly deposited within the pores and occupying from 8 to 30% of the total pore volume thereof.
Inventors
- 👤 Jean Bachot
- 👤 Jean Grosbois
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:43
CPC Classifications
C; C25; C25B; C25B13/00; C25B13/04; C25B13/08
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
55 words
A porous diaphragm adapted for use in an electrolytic cell, said diaphragm comprising an electrolytically acceptable porous sheet member having a total pore volume and average equivalent pore diameter adapted for electrolysis, and having an ion exchange resin fixedly deposited within the pores and occupying from 8 to 30% of the total pore volume thereof.
Claim 2
Dependent Claim
55 words
A porous diaphragm adapted for use in an electrolytic cell, said diaphragm comprising an electrolytically acceptable porous sheet member having a total pore volume and average equivalent pore diameter adapted for electrolysis, and having an ion exchange resin fixedly deposited within the pores and occupying from 8 to 30% of the total pore volume thereof.
Claim 3
Dependent Claim
18 words
The porous diaphragm as defined by claim 1, the total pore volume thereof ranging from 50 to 95%.
Claim 4
Dependent Claim
19 words
The porous diaphragm as defined by claim 2, the average equivalent pore diameter ranging from 0.1 to 12 micrometers.
Claim 5
Dependent Claim
19 words
The porous diaphragm as defined by claim 3, the average equivalent pore diameter ranging from 0.2 to 6 micrometers.
Claim 6
Dependent Claim
16 words
The porous diaphragm as defined by claim 1, said porous sheet member comprising a fluorinated resin.
Claim 7
Dependent Claim
14 words
The porous diaphragm as defined by claim 5, said fluorinated resin comprising a fluorocarbon.
Claim 8
Dependent Claim
14 words
The porous diaphragm as defined by claim 5, said fluorinated resin being fiber reinforced.
Claim 9
Dependent Claim
23 words
The porous diaphragm as defined by claim 1, said ion exchange resin a polymerized, olefinically unsaturated carboxylic acid, or lower alkyl ester thereof.
Claim 10
Dependent Claim
34 words
The porous diaphragm as defined by claim 1, said ion exchange resin being a copolymer of an olefinically unsaturated carboxylic acid or lower alkyl ester thereof, and an olefinically unsaturated nonionic comonomer copolymerizable therewith.
Claim 11
Dependent Claim
22 words
The porous diaphragm as defined by claim 9, said acid comonomer being acrylic or methacrylic acid, or methyl or ethyl ester thereof.
Claim 12
Dependent Claim
20 words
The porous diaphragm as defined by claim 9, said nonionic comonomer comprising admixture of olefinically mono- and polyunsaturated nonionic comonomers.
Claim 13
Dependent Claim
20 words
The porous diaphragm as defined by claim 11, the molar ratio between said nonionic comonomers ranging from 0.1/1 to 10/1.
Claim 14
Dependent Claim
25 words
The porous diaphragm as defined by claim 9, said carboxylic acid comprising from 65 to 90% of the total amount by weight of the comonomers.
Claim 15
Dependent Claim
44 words
A process for the preparation of the porous diaphragm as defined by claim 1, comprising impregnating an electrolytically acceptable porous sheet member with a composition of comonomers polymerizable into said ion exchange resin, and effecting the polymerization of such composition within the pores thereof.
Claim 16
Dependent Claim
19 words
The process as defined by claim 14, said composition of comonomers including a polymerization initiator and an inert diluent.
Claim 17
Dependent Claim
29 words
The process as defined by claim 15, said composition of comonomers comprising 25 to 400 parts by weight of inert diluent per 100 parts by weight of the comonomers.
Claim 18
Dependent Claim
14 words
The porous diaphragm as defined by claim 1, said ion exchange resin being cross-linked.
Claim 19
Dependent Claim
24 words
The porous diaphragm as defined by claim 1, said ion exchange resin, when hydrated, occupying from 20 to 90% of said total pore volume.
Claim 20
Dependent Claim
24 words
The porous diaphragm as defined by claim 18, said ion exchange resin, when hydrated, occupying from 50 to 80% of said total pore volume.
Claim 21
Dependent Claim
22 words
The porous diaphragm as defined by claim 1, said ion exchange resin occupying from 10 to 20% of said total pore volume.
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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) | 1987-02-20 | 1987-08-22 | 1988-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-20 | 1991-08-22 | 1992-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-20 | 1995-08-22 | 1996-02-21 | $7700.00 | Window Closed / Lapsed |