Rohm and Haas Company

Rohm and Haas

Byers, Michael J.

Isacoff, Eric G.

Naples, John O.

Kim, Chan W.

Rha, Chokyun

Robinson, Elizabeth M.

Eric G Isacoff

James Watson Neely

Berni P Chong

John O Naples

Robert L Albright

Eric C Peters

Michael J Byers

Jon R Fisher

Chan W Kim

Treatment of water-soluble, amine-containing polymers with strong acid, cation exchange resins from aromatic copolymer crosslinked with 2-25% polyvinyl crosslinker, followed by ultrafiltration with a membrane filter having a molecular-weight cutoff, measured against the polymers to be treated, of about 10,000 to about 15,000, results in a highly effective removal of residual monomers and oligomers of less than 500 molecular weight.

Process for removing residual monomers and oligemers from

Nonanchorage-dependent cells are immobilized for cell culturing or the production of cell products, by contracting an aqueous suspension of the cells with a floc formed by the combination of positively and negatively charged ion exchange resins having particle sizes ranging from about 0.01 to about 1.5 microns. The flocs may be formed either prior to contract with the cells or may be formed in situ in the cell suspension upon separate addition of the resins, preferably by first adding the positively charged resin followed by the negatively charged resin. The resin floc operates as a microcarrier for the cells.

Immobilization of nonanchorage-dependent cells

Conventional filter aid materials are treated with anion exchange resin materials having particle diameters smaller than 1 micrometer to produce an improved filter aid material bearing a fixed monolayer of the anion exchange resins.

Filter aid materials bearing anion exchange resins

To avoid formation of toxic trihalomethanes in drinking waters disinfected with halogens, these waters are treated with fine-particle-size ion exchange resin particles, optionally in the presence of a metal salt coagulant, to remove the trihalomethane precursors prior to halogenation.

Trihalomethane precursor removal using ion exchange emulsions

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.

Filtration and deionization prepared from cationic and anionic emulsion

Flocs for filtration and deionization prepared from cationic and anionic

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Richboro, PA, United States of America

Eric G Isacoff