Abstract: Thermally regenerable ion exchange resins, which are oxidation resistant, comprising polyetheramines derived from a poly (.alpha.-haloepoxyethane) which has been crosslinked and aminated.

Abstract: An ion exchanger comprising a carrier comprising a synthetic resin having no ion exchange group and having one or more particles of a predetermined size, and a plurality of ion exchange particles disposed on the surface of the carrier and bonded thereto by a binder, wherein the plurality of ion exchange particles are of sizes smaller than the sizes of the carrier particles, and wherein the binder is of a synthetic resin having the same or similar composition as that of the carrier. The ion exchanger is useable in ion chromatography systems.

Abstract: Novel anion exchange resin composites having hydrous chromium III oxide (Cr.sub.2 O.sub.3.nH.sub.2 O) incorporated therein are useful in removing a wide array of polyvalent metal cations from aqueous solution.

Abstract: The density and capacity of macroporous ion exchange resins are increased by incorporating therein at least one of titania hydrate, zirconia hydrate, hydrated titanium phosphorous, and hydrated zirconium phosphate hydrates. Such resin composites are useful, e.g., in removing uranium values from aqueous solutions.

Abstract: A process is provided for making a liquid composition of a perfluorinated polymer having sulfonic acid or sulfonate groups in a liquid medium by contacting the polymer with a mixture of 25 to 100% by weight of water and 0 to 75% by weight of a second liquid component such as a lower alcohol, e.g., propanol or methanol, at a temperature of at least 180.degree. C. (at least 240.degree. C. when about 90% to 100% water is used), in a closed system. The liquid composition made by this process, or modified liquid products prepared therefrom, are used in coating various substrates, in casting films, and in repairing perfluorinated ion exchange films and membranes. The process is also useful in recovering perfluorinated polymer having sulfonic acid or sulfonate groups from scrap and used articles made of such polymer or containing such polymer as a component part thereof.

Abstract: Formation of hydrous alumina in the reticules of a weak-base anion exchange resin, wherein AlCl.sub.3 has been precipitated as hydrous alumina by reaction with ammonia, is improved by employing a subsequent treatment with HCl or with NH.sub.4 Cl and HCl to convert the exchange resin to the chloride form, thereby increasing the reticular volume of the resin, thus permitting subsequent precipitation of additional hydrous alumina therein.

Abstract: Process for the production of bead polymers of improved uniform particle size and uniform quality comprising (a) producing droplets which have a uniform particle size from the monomer or polymerization mixture to be polymerized by spraying the monomer or polymerization mixture into a liquid (continuous phase) which is essentially immiscible with the monomer or polymerization mixture, (b) encapsulating these droplets of uniform size are by shells which are stable under the polymerization conditions to be used and (c) then polymerizing the encapsulated droplets, and with the provision to maintain in the process steps of droplet production and encapsulation of the droplets certain special conditions.

Abstract: A process for the manufacture of crosslinked ion exchange copolymer particles wherein small seed particles are swollen to final size by concurrently feeding monomer and polymerizing the same under controlled suspension conditions and the unique ion exchange particles produced thereby.

Abstract: Preparation and use of novel cation exchange composites are described, said composites comprising polymers having sulfonic acid functional groups which have ionically attached thereto, in the resin phase, amorphous polymer hydrous zirconium oxide groups. These compositions are useful, e.g., for removing sulfate values from NaCl brine.

Abstract: Macroporous cation exchange resins with sulfonic acid functional groups having polymeric zirconium hydrous oxide contained therein are useful in substantially removing SO.sub.4.sup.= ions from metal salt solutions.

Abstract: A process for preparing a fluorinated polymer having carboxylic ester groups from a corresponding polymer having carboxylic acid groups is disclosed, wherein the polymer having carboxylic acid groups is treated with a selected ortho ester, acetal, ketal, borate ester or sulfite ester. The process is useful for assuring that all of the carboxylate groups of a polymer are in the ester form before an extrusion or lamination procedure, both of which are performed with heat and pressure, so as to preclude decarboxylation of free carboxylic acid groups during such procedure.

Abstract: A cation exchange membrane prepared from a blend of two different fluorinated polymers, each containing cation exchange groups selected from carboxylic acid groups, sulfonamide groups, N-monosubstituted sulfonamide groups and sulfonic acid groups, having different exchange capacities with a difference of at least 200 therebetween in terms of equivalent weight. This membrane has been found to be useful in the electrolysis of an aqueous alkali metal halide solution and can give improved results in such an electrolysis.

Abstract: A polymeric membrane having maleic anhydride residues which comprises a blend of a maleic anhydride copolymer and a support polymer, said blend being partially cross-linked with a bifunctional cross-linking reagent. When hydrolyzed, this membrane turns into an ion exchange membrane or a membrane on which an enzyme is immobilized.

Abstract: An ion-exchange system and method is provided for isolating glycosylated hemoglobin (Hb A1) from other hemoglobins in human blood together with a quantitative determination of glycosylated hemoglobin. Separation of the glycosylated hemoglobin is accomplished by the ion-exchange system with little temperature dependence in the range of from about 15.degree.-37.degree. C. and without rigid control of pH and ionic strength. The ion-exchange system lowers the pH of the human blood to about pH=6.9 through the use of a zwitterionic buffer. The ion-exchange system also contains a cation-exchange resin. The preferred composition of the ion-exchange system contains about 0.05 molar 3-(N-morpholino)propanesulfonic acid as the buffer and carboxymethyl dextran as the ion-exchange resin present in an amount of from about 30 milliequivalents to about 50 milliequivalents of binding capacity per liter thereof.

Abstract: Alkaline earth metal ions, e.g., Mg.sup.++ and/or Ca.sup.++, are removed from alkali metal brines, e.g., NaCl, by use of a particulate, macroporous, anion exchange resin containing the in-situ reaction product of polymeric, amorphous, hydrous zirconium oxide and a source of PO.sub.4 ions, e.g., H.sub.3 PO.sub.4.

Abstract: Macroporous cation exchange resins with sulfonic acid functional groups having polymeric hydrous zirconium oxide and polyacrylic acid contained therein are useful in substantially removing sulfate, borate, bicarbonate and/or phosphate ions from alkali metal salt solutions.

Abstract: A light-sensitive adduct comprising the combination of a diazo resin having a plurality of pendant diazonium groups and a sulfonated polymer having a plurality of sulfonate groups and a presensitized light-sensitive article comprising a substrate having a light-sensitive coating which is comprised of the light-sensitive adduct on a surface thereof. After imagewise exposure, unexposed portions of the coating are removable by water or aqueous developers.

Abstract: An ion exchange membrane for an electrolysis is produced by forming a removable thin layer on a surface of a perforated electrode; forming a layer of a thermoplastic fluorinated polymer having ion exchange groups or functional groups convertible to ion exchange groups on said removable thin layer; converting said layer of a thermoplastic fluorinated polymer into a liquid impermeable membrane; and removing said removable thin layer, and if necessary, converting said functional groups into ion exchange groups.

Abstract: An improved pellicular type (agglomerated) anion-exchange chromatographic packing composition which comprises:Component A, a substrate which consists essentially of particles of insoluble synthetic resin, having cation-exchanging sites at least on their available surfaces, the Component A particles being of a diameter of between about 5 to 75 microns and of low porosity relative to Component B microparticles, described below, andComponent B, which consists essentially of microparticles of insoluble synthetic resin, having a volume average diameter of less than about 900 and greater than about 50 Angstroms, the microparticles having anion-exchanging sites, at least on their outer surfaces, which attract available cation sites of Component A, wherein the microparticles of Component B are attached as a monolayer to the available surfaces of the Component A particles.

Abstract: Formation of hydrous alumina in the reticules of a weak-base anion exchange resin, wherein AlCl.sub.3 has been precipitated as hydrous alumina by reaction with ammonia, is improved by employing a subsequent treatment with HCl or with NH.sub.4 Cl and HCl to convert the exchange resin to the chloride form, thereby increasing the reticular volume of the resin, thus permitting subsequent precipitation of additional hydrous alumina therein.

Abstract: An ion exchange composition formed of insoluble synthetic resin support particles with ion exchange sites at their exposed surfaces, and fine synthetic resin layering particles with ion exchange sites on their exposed surfaces, which attract the ion exchange sites of the support particles so that the layering particles are irreversibly attached as a monolayer to the support particles. The layering particles have a median diameter ranging from 0.002 to 0.09 microns, while the ratio of median diameters of the support particles to layering particles range from 100 to 1, and 5000 to 1. The composition is packed into a column and is used for separation of ions in liquid ion exchange chromatography.

Abstract: The present invention relates to novel compounds for the prophylaxis and treatment of Inflammatory Bowel disease (IBD) via the administration of an effective amount in a suitable pharmaceutical dosage of a polymeric agent for releasing 5,5'-azobis-salicylic acid which comprises a non-degradable anionic exchange resin and the dianionic form of 5,5'-azobis-salicylic acid. The 5,5'-azobis-salicylic acid undergoes bacterial cleavage in the mammalian lower bowel to release 5-aminosalicylic acid.

Abstract: A porous open-cell reactive filled material containing a polymeric matrix and a reactive filler. According to the invention, use is made as the polymeric matrix of foamed polyvinylformal and foamed polyurethane. As the reactive filler use is made of finely divided ion-exchange fibres, complex-forming fibres or mixtures thereof in an amount of from 10 to 80% by mass of the final material. Use is made of ion-exchange fibres on the basis of polyvinylalcohol, polyacrylic, cellulose-regenerated, phenolaldehyde, polyolefine, polyvinylhalide fibres. As the complex-forming fibres use is made of fibres based on polyacrylic, polyvinylalcohol, cellulose-regenerated fibres.

Abstract: Novel anion exchange resin composites having hydrous chromium III oxide (Cr.sub.2 O.sub.3. nH.sub.2 O) incorporated therein are useful in removing a wide array of polyvalent metal cations from aqueous solution.

Abstract: An amphoteric ion-permeable composite membrane composed of a microporous substrate, and supported on the substrate, a thin amphoteric ion-exchange film formed of an active amino group-containing polymer which has been interfacially crosslinked at least at the surface portion of the thin film, said membrane being produced by forming a thin layer comprising an active amino group-containing polymer containing 1.0 to 23 milliequivalents/g, as amino equivalent, of an active amino group selected from primary and secondary amino groups and 0 to 18 milliequivalents/g, as amino equivalent, of a tertiary amino group and/or an ammonium salt group per molecule with the total amino content thereof being in the range of 2.

Abstract: A process is provided wherein a fibrous ion exchange cellulose composite is prepared by agglomerating a hydrophobic polymer and fibrous cellulose and then derivatizing the cellulose to impart ion exchange properties thereto. The process is an improvement over the prior art processes wherein the composite is prepared by agglomerating the polymer with fibrous cellulose which has been converted to ion exchange cellulose prior to agglomeration.

Abstract: An ion-exchange composition comprising a substrate of a macroporous synthetic resin having ion-exchanging sites at least on its available surface; and finely divided, synthetic resin particles having a volume average diameter less than 0.1 micron and greater than about 0.005 micron and having, at least on their outer surfaces, ion-exchanging sites which attract the ion-exchanging sites of the substrate, irreversibly attached as a monolayer to the available surface of the substrate. The composition is used for removal and separation of ions, and is especially useful in liquid ion-exchange chromatography.

Abstract: Crystalline hydrous aluminas, Al(OH).sub.3, are reacted with LiX, where X is anion, under appropriate conditions to prepare crystalline compounds conforming substantially to the empirical formulaLiX.2Al(OH).sub.3.nH.sub.2 Owhere X is anion and nH.sub.2 O represents waters of hydration. Depending on the beginning hydrous alumina, some of the crystalline compounds are of a novel 2-layer unit cell structure and some of a 3-layer unit cell structure.

Abstract: Crystalline LiOH.2Al(OH.sub.3.nH.sub.2 O is reacted in aqueous solution with anions (A) having a valence of 1, 2, or 3 to form novel lithium aluminates conforming substantially to the empirical formula(LiA.sub.x).sub.y.2Al(OH).sub.3.nH.sub.2 Owhere n is the number of waters of hydration, y is the number of lithium atoms present for each 2Al atoms, A has a negative valence of 1, 2, or 3, and x is the reciprocal of the valence of A.

Abstract: Porous substrates containing seeds of hydrous crystalline alumina are contacted with an aqueous solution of alkaline aluminate, thereby causing additional crystalline hydrous alumina to grow on the seeds within the pores of the substrate.

Abstract: An anion exchange resin, containing Al(OH).sub.3 suspended therein, is reacted with aq. LiOH to form microcrystalline LiOH.2Al(OH).sub.3 which is then reacted with a halogen acid or halide salt to form microcrystalline LiX.2Al(OH).sub.3. The resin, after having a portion of the LiX eluted by using an aqueous wash, is used to recover Li.sup.+ values from aqueous brines.

Abstract: The agglomeration or clumping of the resins in a resin bed comprising a mixture of anion and cation exchange resins is effectively reduced by treating the anion or cation resin with an aqueous dispersion of water-insoluble polymer particles having a particle size of from about 100 to about 800 A and bearing a moiety having opposite ionic character than the resin being treated. For example, the surface charge exhibited by a strong base anion exchange resin bearing pendant quaternary ammonium groups is reduced by contacting the resin with a colloidal aqueous dispersion of a water-insoluble polymer of a monovinylidene aromatic such as styrene and a small amount of a polyvinylidene aromatic such as divinylbenzene which polymer bears pendant sulfonate groups. The thus treated anion exchange resin can subsequently be mixed with a cation exchange resin to form a mixed resin bed having reduced clumping of resins without coincident decrease in efficiency.

Abstract: A method for the manufacture of an ion exchange resin having a granular activated carbon as the matrix thereof, comprises causing a granular activated carbon to retain therein up to about 30% by weight, based on the weight of granular activated carbon, of a polymerizable solution containing monovinyl monomers and/or polyvinyl monomers in the presence of a polymerization initiator and, optionally, an organic solvent, and allowing the mixed solution as retained in the granular activated carbon to undergo polymerization in an aqueous medium and subsequently introducing therein an ion exchange group.

Abstract: A method for preparing a cementitious ion-exchange resin comprising treating cation- or anion-exchange resin particles having an effective diameter of from about 0.1 to about 1 mm with a material selected from the group consisting of polyacrylate emulsions, polyvinyl alcohol, and polyvinyl acetate, the material having a hydrophilic group, drying the treated ion exchange resin into a cementitious mass, and optionally reducing the particle size of the mass to provide cementitious ion exchange resin grains having an effective diameter of from about 2 to about 50 mm.

Abstract: A fluorinated polymer having pendant cation exchange groups selected from sulfonic acid, carboxylic acid or sulfonamide groups, or their salts, is modified with a sulfonium compound and/or a phosphonium compound for substitution of the counter-ions of the cation exchange groups with sulfonium ions and/or phosphonium ions. The polymers treated in this manner are improved in their melt-flow characteristic to make fusion bonding between these polymers possible. The process is particularly suitable for repairing damaged cation exchange membranes for use in chlor-alkali electrolytic cells to advantageously elongate the life of the membranes.

Abstract: Process for purifying beet juice by contacting the juice to be purified with at least two ion exchangers formed of a porous mineral support covered with a film of cross-linked polymer containing or bearing quaternary ammonium salt groups for at least one of the ion exchangers and sulfone groups for at least one of the other ion exchangers.

Abstract: Process for preparing anion exchange resins comprising polymerizing a vinyl aromatic compound having at least one alkyl group containing about 1 to 3 carbon atoms, alone or mixed with a copolymerizable monomer, optionally in the presence of a mineral support, followed by brominating the alkyl groups of the resulting polymer by means of an N-bromoamide or an N-bromoimide, and then aminating the brominated product obtained. The resulting anion exchange resins are useful in the chemical, pharamaceutical, food, and metallurgical industries.

Abstract: Flocs prepared by mixing cationic and anionic emulsion ion exchange resins are useful as a filtration and deionization medium. Flocs prepared from weakly acidic and weakly basic emulsion ion exchange resins may be regenerated thermally.

Abstract: This invention relates to a method for preparing a water soluble lacquer, which comprises dissolving polyethylene oxide having a molecular weight of at least 2,500,000 in water to form a polyethylene oxide aqueous solution, adding acid to said solution in such a manner as to adjust the pH of the solution in the range of from 3.0 to 5.0, heating the resultant solution at a temperature of not lower than 95.degree. C., cooling the solution and removing the remaining acid with an ion exchange resin.

Abstract: A weakly acidic cation exchange resin which is obtainable by a reaction of glyoxylic acid and a polyvinyl alcohol cross-linked by cross-linking groups each containing two or more carbon atoms, and has an exchange capacity of 3 meq/g or greater and a swelling volume of 10 ml/g or smaller, as well as a process for producing such cation exchange resin.

Abstract: An ion exchange resin bed capable of hydraulic segregation into discrete zones of ion exchange resins having different ion exchange functionalities, the resins being produced by functionalizing fractions of a single batch or lot of precursor copolymer which have been segregated on the basis of differing hydraulic densities of the different sized particles, and the method for producing the same.

Abstract: In the production of a heterogeneous ion exchange membrane in which an ion exchange resin fine powder is dispersed in a thermoplastic resin, a silane-modified polyolefin resin and ion exchange resin fine powder are kneaded, extruded to form a membrane and then subjected to a treatment with hot water, thus obtaining an ion exchange membrane having a high ion transport number in a high ion concentration and a low specific resistance in an aqueous solution of a polyvalent ion salt, which is well balanced.

Abstract: A self-powered device is disclosed for delivering a useful agent. The device comprises (1) a housing member, (2) a variable volume chamber storing a useful agent and having a passageway for delivering the agent in the housing, and (3) a pressure generating member comprising a semipermeable polymer having a cross-linked hydrophilic polymer dispersed therein positioned between the housing and the chamber. In operation, when the device is in a fluid environment, fluid from the environment enters the housing and is imbibed by the hydrophilic polymer into the generator, causing the generator to enlarge and apply pressure against the chamber, thereby decreasing the volume of the chamber and simultaneously dispensing agent through the passageway from the device at a controlled rate over a prolonged period of time. An article of manufacture also is disclosed which consists of a pressure generating member manufactured as a film useful for making a dispensing device.

Abstract: Process for treating anion exchange resins containing a major portion of weak-base groups in catalytically inactive salt form and a minor portion of strong-base groups in catalytically inactive salt form wherein the resin is contacted with an aqueous solution containing ammonium hydroxide and ammonium chloride.

Abstract: A composite anion adsorbent which includes a dehydration cured composite gel of an organic hydrophilic polymer and a metal hydroxide. In the preferred embodiment, the metal hydroxide is a hydroxide such as iron hydroxide, aluminum hydroxide, titanium hydroxide, manganese hydroxide, tin hydroxide and zirconium hydroxide and oxides which form hydroxides in aqueous solutions.

Abstract: This invention relates to removal of cerium, used as a free-radical initiator, from aqueous polymeric dispersions, particularly starch graft copolymer dispersions, by adsorbing cerium (III) onto a strong cation exchange resin, to separation of the adsorbed cerium (III) from the resin using a solution such as sodium sulfate or sodium oxalate to form a cerium (III) precipitate, and to oxidation of the separated cerium (III) to cerium (IV).

Abstract: A process for preparing a composite amphoteric ion exchange membrane, which comprises forming a thin membrane not exceeding 5 microns thick by applying to a surface of a microporous polymer substrate having a physical, selective permeability of its own, a coating consisting of a polymer having either a cation or anion exchange group and a functional group capable of receiving another ion exchange group having an opposite sign from the cation or anion exchange group or a mixture of two polymers one of which has either a cation or an anion exchange group and the other of which has a functional group capable of receiving an ion exchange group having an opposite sign from the cation or anion exchange group, and introducing the ion exchange group having an opposite sign to said functional group to provide a ratio of anion to cation exchange capacity in the range of from 0.5 to 2.0.

Abstract: A process for preparing a carboxylated cellulose ion exchange material which comprises heating a mixture of cellulose and citric, isocitric or aconitic acid at a temperature of from about 100.degree. to 160.degree. C. while removing water, and then treating the product with aqueous alkali at a pH of 8 to 11 to hydrolyze cross-linked acid residues; carboxylated cellulose ion exchange materials prepared by the process and their use in removing heavy-metal ions from aqueous solutions such as in industrial effluent treatment and precious metal recovery.

Abstract: A method of preparing a mixture of cation and anion exchange resins in the size range of about 10 to 250 microns, comprising combining cation exchange resins and anion exchange resins of a size larger than 60 mesh and grinding the combination of anion and cation exchange resins to a size range of about 10 to 250 microns.

Abstract: In performing melt processing of a fluorinated polymer which contains such pendant functional groups as sulfonic acid, carboxylic acid, sulfonamide and salts thereof, an aqueous medium is allowed to be present in the polymer to improve its melt-flow characteristic. Excellent heat sealing can be effected without degradation of the polymer. This method is particularly suitable for repairing the damaged ion-exchange membranes of fluorinated polymers used in the electrolysis of sodium chloride to enable elongation of their life to a great economical advantage.