The Dow Chemical Company

George R Killat

Larry R Wilson

Syamalarao Evani

Donald A Tomalia

Lanny A Robbins

Jerry R Conklin

Edward R Husser

Ion exchange resins and chelate resins are provided with ion exchange or chelate capability by depositing on an insoluble substrate dense star polymers having terminal group densities greater than conventional star polymers exhibiting greater and more uniform reactivity than their corresponding conventional star polymers. For example, a third generation, amine-terminated polyamidoamine dense star polymer prepared from ammonia, methyl acrylate and ethylenediamine having 1.24.times.10.sup.-4 amine moieties per unit volume (cubic Angstrom units) in contrast to the 1.58.times.10.sup.-6 amine moieties per unit volume contained by a conventional star polymer can be reacted with a chloromethylated styrene/divinyl copolymer (insoluble substrate) to form a desirably weak base anion exchange resin.

Ion exchange/chelation resins containing dense star polymers having ion

An improvement in an apparatus for distributing a downflowing liquid uniformly across the packed bed of a vapor-liquid contact column is disclosed. The improvement comprises a predistributor which comprises a plate and an upstanding wall member along one edge. This wall member defines the periphery of the plate such that an open-top compartment is formed. A plurality of drip tubes is installed in the compartment and are defined by upstanding tubular members which extend above and below the plate and which are fastened to the plate, each drip tube having a lengthwise slot extending from the top of the drip tube. The apparatus also comprises a lower distributor unit, which can be of a conventional design or substantially similar to the upper distributor unit, except with additional wall members define separate, open-top compartments. The predistributor and lower distributor unit are mounted horizontally inside the column above the packed bed, such that the predistributor unit is oriented above the lower distributor unit, and at least one of the predistributor unit's drip tubes is in liquid connection with the lower unit. The downflowing liquid enters the predistributor unit through a standpipe conduit, flows through the drip tubes of the predistributor into the lower distributor, then continues through the lower distributor unit downwardly onto the packing.

Liquid distributor apparatus for high turndown ratios and minimum fouling

A process for the preparation of chelation resins is disclosed. By this process, chelation resins can be prepared without the formation of large amounts of waste salt streams. In addition, novel chelation resins are prepared according to this process.

Process for the preparation of chelation resins

Wet strength of paper is effectively increased by contacting paper pulp with an ammonium polyamidoamine having cross-linking functionality such as epoxy or azetidinium and subjecting a wet sheet of such pulp to conditions sufficient to cure the polyamidoamine.

Polyamidoamine containing pendant ammonium moiety having crosslinking

Emulsions of oil and water are resolved by contacting the emulsions with a quaternized polyamidoamine having pendent quaternary ammonium moieties, e.g., an adduct of (1) polyamidoamine prepared from methyl methacrylate and ethylenediamine and (2) 2-hydroxy-3-chloropropyl trimethyl ammonium chloride.

Use of quaternized polyamidoamines as demulsifiers

Ammonium polyamidoamines

Substrates such as paper towels which are printed with an ink formulation containing a polyamidoamine having curable ammonium moieties exhibit improved print retention upon exposure to aqueous detergent compositions.

Ink formulations containing a curable ammonium polyamidoamine as a

Nonwoven mats or sheets having improved tensile strengths are prepared from a fibrous suspension of synthetic fibers thickened with a synthetic, addition polymer bearing pendant carboxamide groups and a cross-linking agent for the polymeric thickener. For example, a fibrous suspension comprising glass fibers, a polymer of acrylamide and a water-soluble hypohalite can be employed to prepare strong, glass fiber mats useful as effective reinforcement for roofing shingles.

Method for preparing fibrous mats from a fibrous suspension

Properties of fibrous materials, e.g., wet and dry strength of paper, are significantly improved by incorporating a cationic polyether into a fibrous material such as pulp. The polyether bears ammonium salt groups exemplified by the formula: ##STR1## wherein R.sub.1 and R.sub.2 are individually hydrogen, hydrocarbyl such as alkyl, hydroxyhydrocarbyl, or hydrocarbylamino; E is individually ##STR2## or E and R.sub.1 are collectively ##STR3## wherein R is hydrogen or alkyl, R.sub.3 is hydroxyl, halogen, hydrogen or hydrocarbyl, R.sub.4 is hydrogen or hydrocarbyl; and A.sup..crclbar. is an anion of an ammonium salt. Such polyethers also function as retention aids for sizing agents and dyes and as antistatic agents.

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Midland, MI, United States of America

George R Killat