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US4426271A
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Homogeneous cation exchange membrane having a multi-layer structure
Assignee: Asahi Kasei Corp
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Filing: 1981-04-09
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Granted: 1984-01-17
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Expires: 2001-04-09
Abstract
Abstract In cation exchange membranes having a multi-layer structure consisting of two or three layers or more each having different equivalent weight and/or different kind of ion exchange group used for the electrolysis of alkali metal chloride according to an ion exchange membrane process, a homogeneous cation exchange membrane which comprises that at least one outer layer having a lower water content of both outer layers of said membrane has a roughened surface so that the amount of hydrogen gas bubbles generated from the cathode and attached to the membrane surface is the least whereby the electrolysis voltage is the lowest and the process for the production thereof.
Inventors
- 👤 Mitsuo Yoshida
- 👤 Yoshinori Masuda
- 👤 Akio Kashiwada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:23
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/20; C08J5/22; C08J5/2287; C08J5/2293; C08J2327/00; C08J2327/02; C08J2327/12
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
70 words
A cation exchange membrane having a multi-layer structure consisting essentially of two or more layers each having a different equivalent weight and/or a different kind of ion exchange group, wherein at least the outer layer of said membrane having the lower water content of both outer layers of said membrane has a surface which is roughened to thereby prevent the adhesion of gas bubbles to the surface thereof during electrolysis.
Claim 2
Dependent Claim
70 words
A cation exchange membrane having a multi-layer structure consisting essentially of two or more layers each having a different equivalent weight and/or a different kind of ion exchange group, wherein at least the outer layer of said membrane having the lower water content of both outer layers of said membrane has a surface which is roughened to thereby prevent the adhesion of gas bubbles to the surface thereof during electrolysis.
Claim 3
Dependent Claim
20 words
The cation exchange membrane according to claim 1 wherein said cation exchange membrane is a fluorocarbon type cation exchange membrane.
Claim 4
Dependent Claim
36 words
The cation exchange membrane according to claim 1 wherein said cation exchange membrane has a roughened surface wherein 20 concavo-convex portions or more per 1 mm having a roughness of 0.05 micron or more are present.
Claim 5
Dependent Claim
38 words
The cation exchange membrane according to claim 1, 2 or 3 wherein said cation exchange membrane has a surface subjected to a roughening treatment according to a heat-press method after the membrane is superimposed on a molded material.
Claim 6
Dependent Claim
30 words
The cation exchange membrane according to claim 1, 2 or 3 wherein said cation exchange membrane has a surface subjected to a roughening treatment according to a dry blast method.
Claim 7
Dependent Claim
30 words
The cation exchange membrane according to claim 1, 2 or 3 wherein said cation exchange membrane has a surface subjected to a roughening treatment according to a liquid honing method.
Claim 8
Dependent Claim
30 words
The cation exchange membrane according to claim 1, 2 or 3 wherein said cation exchange membrane has a surface subjected to a roughening treatment according to a glow discharge method.
Claim 9
Dependent Claim
68 words
A fluorocarbon type multi-layer membrane prepared by uniting two membranes each having a different equivalent weight and/or a different kind of ion exchange group, wherein the outer layer having the lower water content is ground after unification whereby the thickness thereof is made thinner than that immediately after the unification, said outer layer having a roughness which prevents adhesion of gas bubbles to the surface thereof during electrolysis.
Claim 10
Dependent Claim
68 words
A fluorocarbon type multi-layer membrane prepared by uniting two membranes each having a different equivalent weight and/or a different kind of ion exchange group, wherein the outer layer having the lower water content is ground after unification whereby the thickness thereof is made thinner than that immediately after the unification, said outer layer having a roughness which prevents adhesion of gas bubbles to the surface thereof during electrolysis.
Claim 11
Dependent Claim
18 words
The membrane according to claim 8 wherein the thickness of the lower water content layer is 3-20 microns.
Claim 12
Dependent Claim
18 words
The membrane according to claim 8 wherein the thickness of the lower water content layer is 5-10 microns.
Claim 13
Dependent Claim
20 words
The membrane according to claim 8, 9 or 10 wherein the grinding is conducted according to a glow discharge treatment.
Claim 14
Dependent Claim
20 words
The method according to claim 8, 9 or 10 wherein the grinding is conducted according to a liquid honing method.
Claim 15
Dependent Claim
19 words
The method according to claim 8, 9 or 10 wherein grinding is conducted according to a dry blast method.
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) | 1987-01-16 | 1987-07-18 | 1988-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-16 | 1991-07-18 | 1992-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-16 | 1995-07-18 | 1996-01-17 | $7700.00 | Window Closed / Lapsed |