US3647086A
Expired / Lapsed
US
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Cation exchange membrane and method of making same
Assignee: Tokuyama Corp
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Filing: 1969-07-09
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Granted: 1972-03-07
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Expires: 1989-07-09
Abstract
Abstract A cation exchange membrane comprising a membranous insoluble, infusible organic high-molecular-weight polymer having cation exchange groups chemically bonded thereto and having the dimension of at least 1 centimeter in two directions, the substantial surface of said membrane being chemically bonded with acid amide bonds in a proportion such that the percentage indicated by the following equation is satisfied: A/(A+B) X 100 15-10 5% wherein A is the number of acid amide bonds per gram of dry membrane and B is the number of cation exchange groups per gram of dry membrane, SAID ACID AMIDE BONDS BEING COMPOSED OF A CATION EXCHANGE GROUP AND AN AMINE HAVING ONE AMINO GROUP CONTAINING AT LEAST ONE HYDROGEN ATOM BONDED TO A NITROGEN ATOM AND A METHOD OF MAKING THE SAME.
Inventors
- 👤 Yukio Mizutani
- 👤 Reiichi Yamane
- 👤 Toshikatsu Sata
- 👤 Ryuji Izuo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:38
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/20; C08J5/22; C08J5/2287; B; B01; B01J; B01J47/00; B01J47/016; C08J2379/00; C08J2379/04; C08J2379/06
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
27 words
The cation exchange membrane of claim 1 wherein said cation exchange group is selected from the class consisting of sulfonic acid, carboxylic acid and phosphonic acid groups.
Claim 2
Dependent Claim
29 words
The cation exchange membrane of claim 1 wherein said acid amide bonds are selected from the group consisting of sulfonic acid amide, carboxylic acid amide and phosphoric acid amide.
Claim 3
Dependent Claim
18 words
The cation exchange membrane of claim 1 wherein said amine has a molecular weight of at least 200.
Claim 4
Dependent Claim
21 words
The cation exchange membrane of claim 4 wherein said amine is selected from the group consisting of compounds of the formula
Claim 5
Dependent Claim
12 words
The cation exchange membrane of claim 1 wherein said amine is polyethyleneimine.
Claim 6
Dependent Claim
12 words
The cation exchange membrane of claim 1 wherein said amine is polyvinylamine.
Claim 7
Dependent Claim
12 words
The cation exchange membrane of claim 1 wherein said amine is polyaminostyrene.
Claim 8
Dependent Claim
12 words
The cation exchange membrane of claim 1 wherein said amine is polyallylamine.
Claim 9
Independent Claim
154 words
A method of making a cation exchange membrane having chemically bonded cation exchange groups and acid amide groupS which comprises reacting an amine having at least one amino group containing at least one hydrogen atom bonded to a nitrogen atom, with an insoluble, infusible organic high molecular weight polymeric membrane having chemically bonded thereto reactive groups selected from the group consisting of sulfonic acid halide groups, carboxylic acid halide groups phosphoric acid halide groups and carboxylic acid anhydride units, in a proportion such that the percentage indicated by the following equation is satisfied: A/(A B) X 100 (15- 10 5) 1 X 10 5 to 15% wherein A is the number of acid amide bonds per gram of dry membrane, and B is the number of cation exchange groups per gram of dry membrane, and thereafter treating said membrane with an aqueous alkaline solution to hydrolyze the remaining reactive groups to cation exchange groups.
Claim 10
Dependent Claim
42 words
The method of claim 10 wherein a water-soluble salt of a cationic constituent selected from the group consisting of ammonium, alkali metals, alkaline earth metals and transition metals is present during the reaction of said membrane having reactive groups with said amine.
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) | 1975-03-07 | 1975-09-06 | 1976-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-07 | 1979-09-06 | 1980-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-07 | 1983-09-06 | 1984-03-07 | $7700.00 | Window Closed / Lapsed |