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7625955 |
Porous polymeric article
A porous article which is formed from a polymeric material, in which characteristics of the surface of the article provided by the polymeric material are modified by having grafted to it chains of...
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7615300 |
Development of novel proton-conductive polymers for proton exchange membrane fuel cell (PEMFC) technology
New thermally and chemically stable sulfonic acid-containing polymers are synthesized via post-sulfonation of aromatic polymers. These new polymers provide unique benefits to proton exchange...
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7608187 |
Manufacture of a chromatography matrix
The present invention relates to method of manufacturing a sulphonate-functionalized (S-functionalized) cation exchanger, which method comprises reacting olefinic groups with bisulphite in the...
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7544764 |
Sulfonated polymer composition for forming fuel cell electrodes
A membrane electrode assembly for a fuel cell is described. The materials for the membrane electrode assembly are formed from sulfonated polymers. A polymer dispersion ink containing the sulfonated...
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7485227 |
Polyazole-based polymer films
The present invention relates to polymer films and a polymer membrane having an improved mechanical property profile produced therefrom, to a process for producing them and to their use. The...
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7473714 |
Materials for use as proton conducting membranes for fuel cells
A family of polymers having pendent sulfonate moieties connected to polymeric main chain phenyl groups are described. These polymers are prepared by the steps of polymerization (using a monomer...
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7435498 |
Polymer electrolyte membranes crosslinked by nitrile trimerization
A method is provided for making a crosslinked polymer electrolyte, typically in the form of a membrane for use as a polymer electrolyte membrane in an electrolytic cell such as a fuel cell, by...
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7368505 |
Graft copolymers
This invention relates to methods of making graft copolymers, and articles having such graft copolymers. The methods may provide better control than in radicalization or photoinitiated...
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7361729 |
Ion-conducting sulfonated polymeric materials
Sulfonated polymers are made by the direct polymerization of a sulfonated monomer to form the sulfonated polymers. The types of sulfonated polymers may include polysulfones or polyimides. The...
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7320754 |
Method of preparing multi-modal anion-exchange ligands
The invention relates to a method of preparing multi-modal anion-exchange ligands, which comprises providing a cyclic three-functional scaffold comprising an amine, a carbonyl and a thiol;...
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7307127 |
Highly sulfonated block copolymer hydrogels and uses thereof
A block copolymer composition AB is provided that has pendent groups —RZ extending from the A copolymer on at least 70 mol % of the A monomers, where R and Z are each an ionic species. The...
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7294685 |
Sulfonated polyphosphazene derivative and method for producing the same
A polyphosphazene derivative and an aromatic ring compound are bonded to one another to obtain an intermediate product. Subsequently, anhydrous sulfuric acid is added in such an amount that the...
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7265159 |
Monodisperse anion exchangers
Process for preparing monodisperse weakly basic or optionally strongly basic anion exchangers of the poly(meth)acrylamide type, the ion exchangers themselves and their use.
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7229553 |
Method for producing a membrane made of bridged polymer and a fuel cell
Method for producing a membrane made of bridged polymer and a fuel cell. The present invention relates to a membrane comprising a bridged polymer which is produced by a selected process. The...
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7094469 |
Porous or non-porous substrate coated with an immobilized polymeric composition having sulfonyl groups and hydrophilic functional groups and process
A porous or non-porous polymeric substrate having its surface modified with an immobilized fluorocarbon such as perfluorocarbon, polymeric composition is provided. The immobilized fluorocarbon is...
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7077964 |
Process for preparing monodisperse ion exchangers having chelating functional
The present invention relates to a process for preparing novel, monodisperse ion exchangers having chelating functional groups, and their use for adsorbing metal compounds, in particular, heavy...
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7071240 |
Carboxylic cationites and methods of manufacture
A method for preparing synthetic polymerized resins for ion exchange, namely, carboxylic cationites, which are suitable as sorbents for preparative separation and purification of biologically...
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7067059 |
Generation of ion exchanger media
The present invention relates to a method of generating a separation medium comprising mixed mode cation-exchanger ligands coupled to a base matrix, which method comprises to provide a scaffold...
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6924318 |
Method for making a bipolar membrane and use of resulting bipolar membrane
A process for producing a bipolar membrane is described in which a cationic membrane undergoes a treatment with a salt from a group 8 metal, an anionic membrane undergoes a treatment with a salt of...
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6924317 |
Process for producing coarse-particle anion-exchanger gels
The present invention relates to a process for producing monodisperse anion-exchanger gels with high stability, purity and coarse particle size greater than 800 μm starting from a monodisperse...
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6919382 |
Preparation and uses of conjugated solid supports for boronic acids
The invention provides novel solid supports comprising dihydroxyalkyl aminoalkyl and dihydroxyalkylaminobenzyl groups, and methods for making and using them. The supports are particularly useful...
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6914084 |
Membranes containing sulfonated polyetherketone and another polymer, method for the production and use thereof
Membranes comprising sulfonated polyether ketone and another polymer, process for their production, and their use, Membranes comprising from 30 to 99.5% by weight of a sulfonated, strictly...
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6844371 |
Material having separating function
An object of the present invention is to provide a separation functional material having more excellent adsorptive separation performance than previously. In order to attain this object, separation...
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6790553 |
Method for producing bridged polymer membrane and fuel cell
A method for producing a bridged polymer membrane includes the steps of: obtaining a liquid medium comprising a basic polymer having an amino group in a repeating unit, a bridging agent, and a...
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6784213 |
Method for preparation of strong acid cation exchange resins
An improved process for preparing strong acid cation exchange resins by sulfonation of wet crosslinked copolymer in the absence of organic swelling solvents is disclosed. This process involves...
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6765027 |
Ion-exchange materials with improved ion conductivity
Ion-exchange materials comprising a polymeric backbone and a plurality of pendent styrenic or fluoridated styrenic macromonomers covalently bonded thereto, wherein the plurality of pendent styrenic...
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6759442 |
Packing material for solid phase extraction and solid phase extraction method
An object of the present invention is to provide a packing material for solid phase extraction, ensuring excellent recovery of not only a hydrophobic substance but also an ionic substance by having...
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6750259 |
Process for preparing gel-type cation exchangers
The invention relates to a process for preparing gel-type cation exchangers of high stability by sulfonation of crosslinked (meth)acrylic ester-containing bead polymers with sulfuric acid having a...
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6740684 |
Process for producing a strong-acid cation exchange resin
A strong-acid cation exchange resin in acid form is contacted with an alkylcarhamoyl alkylthioester in the presence of water for producing a strong-acid cation exchange resin comprising a plurality...
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6730816 |
High productivity bisphenol-A catalyst
A high productivity catalyst for bisphenol-A has been discovered which comprises strongly acidic cation-exchange resin spheres produced from a polystyrene/divinylbenzene (PS/DVB) copolymer...
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6723758 |
Graft polymeric membranes and ion-exchange membranes formed therefrom
Graft polymeric membranes and methods for making graft polymeric membranes have one or more trifluorovinyl aromatic monomers that are radiation graft polymerized to a polymeric base film. The...
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6696385 |
Method of preserving sulfonic acid-type cation-exchange resin modified with thiol-containing amine compound
The present invention aims at inhibiting a lowering in the modification ratio of a modified cation-exchange resin, in which part of the sulfonic acid groups have been modified with a...
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6680346 |
Phosphorus atom-containing fluorinated cation exchange membrane and proton conduction type fuel cell using the same
A phosphorus atom-containing fluorinated cation exchange membrane substantially constituted with the following repeating units (A) and (B), and a proton conduction type fuel cell using the membrane...
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6646017 |
Process for the preparation of low-bleeding cation exchangers
Strongly acid cation exchangers with improved properties are obtained if the sulphonation of the non-functionalized polymers is carried out at a high temperature and/or in the absence of oxygen.
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6632847 |
Polymer composition, membrane containing said composition, method for the production and uses thereof
Polymer composition, membrane comprising the same, process for production thereof and use thereof The composition described comprises 30 to 99.5% by weight of a sulfonated aromatic polyether...
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6624206 |
Process for the preparation of free-flowing strongly acidic cation exchangers
The invention relates to processes for the preparation of free-flowing end products of strongly acidic cation exchangers. In the case of the strongly acidic cation exchangers prepared by the...
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6602968 |
Free radical polymerization method for fluorinated copolymers
This invention concerns a process for production of copolymers, especially functionalized, or, at least partially fluorinated copolymers by means of a polymerization process comprising:...
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6569910 |
Ion exchange resins and methods of making the same
Ion exchange resin granules containing a crosslinked polymerized α,β-unsaturated acid, like acrylic acid, or a vinyl monomer containing an amino group, like polyvinylamine, and methods of...
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6534554 |
Multicomponent ion exchange resins
Multicomponent ion exchange resin granules containing at least one acidic resin and at least one basic resin. Each granule contains at least one microdomain of the acidic resin in contact with, or...
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6531519 |
Antimicrobial synthetic ion exchange resins
A method of preventing the growth of heterotrophic bacteria and the subsequent establishment of a biofilm on the surface and in the micropores of an antimicrobial synthetic ion exchange resin. An...
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6486222 |
Combination ion exchange resin bed for the synthesis of bisphenol A
The invention is a catalytic ion exchange resin bed with low pressure drop, low catalyst breakage and low catalyst deactivation as well as an improved process for the production of bisphenol A...
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6465580 |
Functional polymers with carbon-linked functional groups
A functional polymer having active and stable functional groups, for separation or reactive processes in chemical manufacture or analysis, has carbon-linked functional groups on dimethylene...
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6432314 |
Anion exchange materials and processes
Anion exchange material surfaces are provided with zwitterionic and cationic groups, preferably by coating with a polymer formed from monomers including a zwitterionic monomer, a cationic monomer...
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6420439 |
Crosslinked, non-swellable ampholytic base resins
Described are non-swelling, crosslinked, bead forms of ampholytic base polymers that can be utilized in the chromatographic-type separation of acids from other compounds. Preferred polymers are...
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6410656 |
Cation exchangers or chelating agents and process for the preparation thereof
A cation exchanger or a chelating agent having at least structural units represented by the following formula (I), the structural units being derived from a crosslinkable monomer containing an...
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6329556 |
Process for preparing bisphenol A
This invention relates to a process for preparing bisphenol A by the condensation of phenol with acetone in the presence of cation exchange resin obtained by sulfonating copolymers of monovinyl...
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6329435 |
Process for preparing monodisperse, crosslinked bead polymers having thiourea groups and their use for adsorbing metal compounds
The present invention relates to a process for preparing novel, monodisperse crosslinked bead polymers having thiourea groups and their use for adsorbing metal compounds, in particular heavy metal...
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6323249 |
Macroporous resins having large pores but with high crush strength
Crosslinked macroporous resins and ion-exchange resins produced therefrom which have a significantly high crush strength to be useful in the removal of colloidal silica, iron, aluminum and other...
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6235802 |
High surface area adsorbents and method of preparation
A process for the preparation of high surface area, low-swelling macroporous polymeric adsorbents is disclosed. The use of organic sulfonic acids to provide postcrosslinking of macroporous...
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6228896 |
Process for the preparation of very acidic cation exchangers
The invention relates to a process for the preparation of mechanically and osmotically stable, high-capacity strongly acidic cation exchangers having a particle size of ≥0.1 mm by sulphonation of...
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