Macromolecular compounds obtained by reactions only involving unsaturated carbon-to-carbon bonds

Industry

CPC
B01J41/14

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Parent Industries

BPERFORMING OPERATIONS TRANSPORTING B01Physical, chemical processing B01JCHEMICAL OR PHYSICAL PROCESSES B01J41/00Anion exchange Use of material as anion exchangers Treatment of material for improving the anion exchange properties

Current Industry

B01J41/14Macromolecular compounds obtained by reactions only involving unsaturated carbon-to-carbon bonds

Industries

Patents Grantslast 30 patents

Information Patent Grant
Anionic exchange-hydrophobic mixed mode chromatography resins
- Patent number 12,364,978
- Issue date Jul 22, 2025
- Bio-Rad Laboratories, Inc.
- Christopher Belisle
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Grant
Particles with biocidal coating
- Patent number 12,349,676
- Issue date Jul 8, 2025
- INSTRACTION GMBH
- Martin Welter
- C02 - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
Information Patent Grant
Ionic functionalization of aromatic polymers for ion exchange membr...
- Patent number 12,318,770
- Issue date Jun 3, 2025
- Rensselaer Polytechnic Institute
- Chulsung Bae
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Fabrication of reinforced anion exchange membranes
- Patent number 12,319,800
- Issue date Jun 3, 2025
- HYDROLITE LTD
- Charly David Azra
- C02 - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
Information Patent Grant
Alkaline anion exchange membranes derived from diphenylethylene and...
- Patent number 12,303,880
- Issue date May 20, 2025
- Rensselaer Polytechnic Institute
- Sangwoo Lee
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Method for producing a hydrophilic surface on PS/DVB copolymer part...
- Patent number 12,291,618
- Issue date May 6, 2025
- Metrohm AG
- Andreas Seubert
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Grant
Sulfonamide based anion exchange resins
- Patent number 12,285,704
- Issue date Apr 29, 2025
- DIONEX CORPORATION
- Melvin Hatch
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Grant
Thermally stable hydrocarbon-based anion exchange membrane and iono...
- Patent number 12,220,691
- Issue date Feb 11, 2025
- Rensselaer Polytechnic Institute
- Sangwoo Lee
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Grant
Treatment of water
- Patent number 12,195,363
- Issue date Jan 14, 2025
- DDP SPECIALTY ELECTRONIC MATERIALS US, LLC
- Daryl J. Gisch
- C02 - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
Information Patent Grant
Multimodal chromatographic media for protein separation
- Patent number 12,134,089
- Issue date Nov 5, 2024
- Christopher A. Pohl
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Grant
Process for making biobased products from sugars
- Patent number 12,122,739
- Issue date Oct 22, 2024
- Archer-Daniels-Midland Company
- James Brazdil
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Method for purifying organic solvent and apparatus for purifying or...
- Patent number 12,115,525
- Issue date Oct 15, 2024
- Organo Corporation
- Noriko Takada
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Grant
Chemically modified anion exchange membrane
- Patent number 12,104,030
- Issue date Oct 1, 2024
- DANKOOK UNIVERSITY CHEONAN CAMPUS INDUSTRY ACADEMIC COOPERATION FOUNDATION
- Chang Hyun Lee
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Grant
Cationic copolymers with pendant N-allylimidazolium groups
- Patent number 12,103,994
- Issue date Oct 1, 2024
- 3M Innovative Properties Company
- Claire Hartmann-Thompson
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Grant
Cross-linked high stable anion exchange blend membranes with polyet...
- Patent number 12,083,511
- Issue date Sep 10, 2024
- Jochen Kerres
- C25 - ELECTROLYTIC OR ELECTROPHORETIC PROCESSES APPARATUS THEREFOR
Information Patent Grant
Anion-exchange membranes and methods of making and using the same
- Patent number 12,030,981
- Issue date Jul 9, 2024
- Georgia Tech Research Corporation
- Paul A. Kohl
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Grant
Method for analyzing metal impurity content and kit for analyzing m...
- Patent number 12,025,603
- Issue date Jul 2, 2024
- Organo Corporation
- Kyohei Tsutano
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Grant
Quaternized polyaromatics for use in electrochemical devices
- Patent number 12,024,576
- Issue date Jul 2, 2024
- ORION POLYMER CORP.
- Chulsung Bae
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Grant
Copolymers with cationic, nitrogen-containing groups and anion exch...
- Patent number 12,018,104
- Issue date Jun 25, 2024
- 3M Innovative Properties Company
- Claire Hartmann-Thompson
- C25 - ELECTROLYTIC OR ELECTROPHORETIC PROCESSES APPARATUS THEREFOR
Information Patent Grant
Methods of making anion exchange membrane via simultaneous post-fun...
- Patent number 11,987,681
- Issue date May 21, 2024
- Rensselaer Polytechnic Institute
- Chulsung Bae
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Grant
Composite ion exchange membrane and method of making same
- Patent number 11,987,680
- Issue date May 21, 2024
- Bamdad Bahar
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Grant
Thermally stable hydrocarbon-based anion exchange membrane and iono...
- Patent number 11,969,723
- Issue date Apr 30, 2024
- Rensselaer Polytechnic Institute
- Sangwoo Lee
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Analytical method for sugar chains having acidic groups
- Patent number 11,938,464
- Issue date Mar 26, 2024
- JCR Pharmaceuticals Co., Ltd.
- Tomoki Fukatsu
- G01 - MEASURING TESTING
Information Patent Grant
Alkaline anion exchange membranes derived from diphenylethylene and...
- Patent number 11,938,472
- Issue date Mar 26, 2024
- Rensselaer Polytechnic Institute
- Sangwoo Lee
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Grant
Self-invertible inverse latex comprising, as an inverting agent, su...
- Patent number 11,912,797
- Issue date Feb 27, 2024
- Societe d'Exploitation de Produits pour les Industries Chimiques-Seppic
- Miruna Bodoc
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Anionic exchange-hydrophobic mixed mode chromatography resins
- Patent number 11,896,969
- Issue date Feb 13, 2024
- Bio-Rad Laboratories, Inc.
- Christopher Belisle
- C12 - BIOCHEMISTRY BEER SPIRITS WINE VINEGAR MICROBIOLOGY ENZYMOLOGY MUTATION...
Information Patent Grant
Method for producing ultrapure water, ultrapure water production sy...
- Patent number 11,897,790
- Issue date Feb 13, 2024
- Organo Corporation
- Kyohei Tsutano
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Grant
Carbazolium salt and use thereof in anion exchange membranes
- Patent number 11,883,813
- Issue date Jan 30, 2024
- Technion Research & Development Foundation Limited
- Charles Eliezer Diesendruck
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Grant
Ionic functionalization of aromatic polymers for ion exchange membr...
- Patent number 11,826,746
- Issue date Nov 28, 2023
- Rensselaer Polytechnic Institute
- Chulsung Bae
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Chemically modified anion exchange membrane and method of preparing...
- Patent number 11,773,228
- Issue date Oct 3, 2023
- DANKOOK UNIVERSITY CHEONAN CAMPUS INDUSTRY ACADEMIC COOPERATION FOUNDATION
- Chang Hyun Lee
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL

Patents Applicationslast 30 patents

Information Patent Application
Core-Shell Ion-Exchange Resin Formed by Vibrational Nozzle Technique
- Publication number 20250236708
- Publication date Jul 24, 2025
- Saudi Arabian Oil Company
- Madina Baltaeva
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Application
DEVICE AND METHOD FOR PASSIVE COLLECTION OF ATMOSPHERIC CARBON DIOX...
- Publication number 20250229222
- Publication date Jul 17, 2025
- Arizona Board of Regents on behalf of Arizona State University
- Klaus LACKNER
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Application
ANION EXCHANGE POLYMERS AND MEMBRANES FOR ELECTROLYSIS
- Publication number 20250186987
- Publication date Jun 12, 2025
- UOP LLC
- Chunqing Liu
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Application
ANION EXCHANGE RESIN, ANION EXCHANGE MEMBRANE, ANION-EXCHANGE-GROUP...
- Publication number 20250144614
- Publication date May 8, 2025
- Kake Educational Institution
- Hideyuki HIGASHIMURA
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Application
REMOVAL OF VIRUSES FROM WATER BY FILTRATION
- Publication number 20250115494
- Publication date Apr 10, 2025
- instrAction GmbH
- Martin WELTER
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Application
CROSS-LINKED HIGH STABLE ANION EXCHANGE BLEND MEMBRANES WITH POLYET...
- Publication number 20250114782
- Publication date Apr 10, 2025
- Between Lizenz GMBH
- Jochen KERRES
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
MATERIAL FOR REMOVING IMPURITIES IN ORGANIC SOLVENT AND METHOD FOR...
- Publication number 20250025869
- Publication date Jan 23, 2025
- KURITA WATER INDUSTRIES LTD.
- Takahiro KAWAKATSU
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Application
COMPOSITE ION EXCHANGE MEMBRANE AND METHOD OF MAKING SAME
- Publication number 20240368363
- Publication date Nov 7, 2024
- USA Fortescue IP, INC.
- Bamdad Bahar
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Application
Anion Exchange Resins
- Publication number 20240359172
- Publication date Oct 31, 2024
- The Johns Hopkins University
- Luke P. Skala
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Application
POLYMER BODIES WITH AMINE OR AMMONIUM ACTIVATION FOR WATER TREATMEN...
- Publication number 20240342700
- Publication date Oct 17, 2024
- CHEMRA GmbH
- Rudolf WEINAND
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Application
POLYMER BODIES WITH AMINE OR AMMONIUM ACTIVATION FOR WATER TREATMEN...
- Publication number 20240343615
- Publication date Oct 17, 2024
- CHEMRA GmbH
- Rudolf WEINAND
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Application
FABRICATION OF REINFORCED ANION EXCHANGE MEMBRANES
- Publication number 20240317952
- Publication date Sep 26, 2024
- HYDROLITE LTD
- Charly David AZRA
- C02 - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
Information Patent Application
ANION-EXCHANGE MEMBRANES AND METHODS OF MAKING AND USING THE SAME
- Publication number 20240317931
- Publication date Sep 26, 2024
- Georgia Tech Research Corporation
- Paul A. Kohl
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Application
OXYGENATED HYDROCARBON PRODUCTION SYSTEM WITH ACIDIC IMPURITY REMOV...
- Publication number 20240317697
- Publication date Sep 26, 2024
- SipChem Sahara International Petrochemical Company JSC
- Nilenindran Sundra GOVENDER
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Application
QUATERNIZED POLYAROMATICS FOR USE IN ELECTROCHEMICAL DEVICES
- Publication number 20240309139
- Publication date Sep 19, 2024
- ORION POLYMER CORP.
- Chulsung Bae
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Application
STYRENIC FLUOROPOLYMERS AND METHODS FOR MAKING AND USING SAME
- Publication number 20240307863
- Publication date Sep 19, 2024
- University of Louisiana Lafayette
- Sushant P. SAHU
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Application
THERMALLY STABLE HYDROCARBON-BASED ANION EXCHANGE MEMBRANE AND IONO...
- Publication number 20240286123
- Publication date Aug 29, 2024
- Rensselaer Polytechnic Institute
- Sangwoo LEE
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
ALIPHATIC ANION EXCHANGE POLYMERS
- Publication number 20240278227
- Publication date Aug 22, 2024
- University of Delaware
- Yushan Yan
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Application
ALKALINE ANION EXCHANGE MEMBRANES DERIVED FROM DIPHENYLETHYLENE AND...
- Publication number 20240261774
- Publication date Aug 8, 2024
- Rensselaer Polytechnic Institute
- Sangwoo LEE
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Application
ANIONIC EXCHANGE-HYDROPHOBIC MIXED MODE CHROMATOGRAPHY RESINS
- Publication number 20240261775
- Publication date Aug 8, 2024
- Bio-Rad Laboratories, Inc.
- CHRISTOPHER BELISLE
- C07 - ORGANIC CHEMISTRY
Information Patent Application
TWO COMPONENT ION EXCHANGE RESINS
- Publication number 20240238774
- Publication date Jul 18, 2024
- ION EXCHANGE (INDIA) LIMITED
- Prabhakar Rajaram PARAB
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Application
ION EXCHANGER, METHOD FOR PRODUCING ION EXCHANGER, CATALYST HAVING...
- Publication number 20240216904
- Publication date Jul 4, 2024
- ORGANO CORPORATION
- Shinji NAKAMURA
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Application
QUATERNARY AMMONIUM-FUNCTIONALIZED POLYMERS AND METHODS OF MAKING A...
- Publication number 20240158564
- Publication date May 16, 2024
- Cornell University
- Geoffrey W. Coates
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Application
IONIC FUNCTIONALIZATION OF AROMATIC POLYMERS FOR ION EXCHANGE MEMBR...
- Publication number 20240157353
- Publication date May 16, 2024
- Rensselaer Polytechnic Institute
- Chulsung Bae
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Application
WEAK BASE ANION RESIN POLYMERS COMPRISING ALKYLAMINE SEGMENTS AND C...
- Publication number 20240150511
- Publication date May 9, 2024
- Xerox Corporation
- JONATHAN BACHMAN
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
CHEMICALLY STABLE ION CONDUCTORS AND USES THEREOF
- Publication number 20240123437
- Publication date Apr 18, 2024
- Technion Research & Development Foundation Limited
- Charles Eliezer DIESENDRUCK
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
Metal Removal Filtering Material and Cartridge Filter
- Publication number 20240123435
- Publication date Apr 18, 2024
- TOYO ROSHI KAISHA, LTD.
- Toshihiro Nakanishi
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Application
IN-SITU QUATERNARIZATION AND CROSS-LINKING OF ANION EXCHANGE MEMBRA...
- Publication number 20240110302
- Publication date Apr 4, 2024
- PAUL KOHL
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Application
Method for Treating Organic Compounds from Industrial Wastewater wi...
- Publication number 20240059590
- Publication date Feb 22, 2024
- VEOLIA ENVIRONNEMENT
- Romain Gandre
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Application
METHODS OF MODIFICATION OF ION EXCHANGE MEMBRANES
- Publication number 20240042393
- Publication date Feb 8, 2024
- GVD Corporation
- Christopher M. Thompson
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL

Macromolecular compounds obtained by reactions only involving unsaturated carbon-to-carbon bonds

Industry

Parent Industries

Current Industry

Patents Grantslast 30 patents

Anionic exchange-hydrophobic mixed mode chromatography resins

Particles with biocidal coating

Ionic functionalization of aromatic polymers for ion exchange membr...

Fabrication of reinforced anion exchange membranes

Alkaline anion exchange membranes derived from diphenylethylene and...

Method for producing a hydrophilic surface on PS/DVB copolymer part...

Sulfonamide based anion exchange resins

Thermally stable hydrocarbon-based anion exchange membrane and iono...

Treatment of water

Multimodal chromatographic media for protein separation

Process for making biobased products from sugars

Method for purifying organic solvent and apparatus for purifying or...

Chemically modified anion exchange membrane

Cationic copolymers with pendant N-allylimidazolium groups

Cross-linked high stable anion exchange blend membranes with polyet...

Anion-exchange membranes and methods of making and using the same

Method for analyzing metal impurity content and kit for analyzing m...

Quaternized polyaromatics for use in electrochemical devices

Copolymers with cationic, nitrogen-containing groups and anion exch...

Methods of making anion exchange membrane via simultaneous post-fun...

Composite ion exchange membrane and method of making same

Thermally stable hydrocarbon-based anion exchange membrane and iono...

Analytical method for sugar chains having acidic groups

Alkaline anion exchange membranes derived from diphenylethylene and...

Self-invertible inverse latex comprising, as an inverting agent, su...

Anionic exchange-hydrophobic mixed mode chromatography resins

Method for producing ultrapure water, ultrapure water production sy...

Carbazolium salt and use thereof in anion exchange membranes

Ionic functionalization of aromatic polymers for ion exchange membr...

Chemically modified anion exchange membrane and method of preparing...

Patents Applicationslast 30 patents

Core-Shell Ion-Exchange Resin Formed by Vibrational Nozzle Technique

DEVICE AND METHOD FOR PASSIVE COLLECTION OF ATMOSPHERIC CARBON DIOX...

ANION EXCHANGE POLYMERS AND MEMBRANES FOR ELECTROLYSIS

ANION EXCHANGE RESIN, ANION EXCHANGE MEMBRANE, ANION-EXCHANGE-GROUP...

REMOVAL OF VIRUSES FROM WATER BY FILTRATION

CROSS-LINKED HIGH STABLE ANION EXCHANGE BLEND MEMBRANES WITH POLYET...

MATERIAL FOR REMOVING IMPURITIES IN ORGANIC SOLVENT AND METHOD FOR...

COMPOSITE ION EXCHANGE MEMBRANE AND METHOD OF MAKING SAME

Anion Exchange Resins

POLYMER BODIES WITH AMINE OR AMMONIUM ACTIVATION FOR WATER TREATMEN...

POLYMER BODIES WITH AMINE OR AMMONIUM ACTIVATION FOR WATER TREATMEN...

FABRICATION OF REINFORCED ANION EXCHANGE MEMBRANES

ANION-EXCHANGE MEMBRANES AND METHODS OF MAKING AND USING THE SAME

OXYGENATED HYDROCARBON PRODUCTION SYSTEM WITH ACIDIC IMPURITY REMOV...

QUATERNIZED POLYAROMATICS FOR USE IN ELECTROCHEMICAL DEVICES

STYRENIC FLUOROPOLYMERS AND METHODS FOR MAKING AND USING SAME

THERMALLY STABLE HYDROCARBON-BASED ANION EXCHANGE MEMBRANE AND IONO...

ALIPHATIC ANION EXCHANGE POLYMERS

ALKALINE ANION EXCHANGE MEMBRANES DERIVED FROM DIPHENYLETHYLENE AND...

ANIONIC EXCHANGE-HYDROPHOBIC MIXED MODE CHROMATOGRAPHY RESINS

TWO COMPONENT ION EXCHANGE RESINS

ION EXCHANGER, METHOD FOR PRODUCING ION EXCHANGER, CATALYST HAVING...

QUATERNARY AMMONIUM-FUNCTIONALIZED POLYMERS AND METHODS OF MAKING A...

IONIC FUNCTIONALIZATION OF AROMATIC POLYMERS FOR ION EXCHANGE MEMBR...

WEAK BASE ANION RESIN POLYMERS COMPRISING ALKYLAMINE SEGMENTS AND C...

CHEMICALLY STABLE ION CONDUCTORS AND USES THEREOF

Metal Removal Filtering Material and Cartridge Filter

IN-SITU QUATERNARIZATION AND CROSS-LINKING OF ANION EXCHANGE MEMBRA...

Method for Treating Organic Compounds from Industrial Wastewater wi...

METHODS OF MODIFICATION OF ION EXCHANGE MEMBRANES