The Dow Chemical Company

Dow Global Technolgoies LLC

Chonde, Yohannes

Yohannes Chonde

Jack C Lamphere

Frederick W Stanley, Jr

Kyung W Suh

John Bernard Horstman

Robert A Kirchhoff

Daniel D Imeokparia

Charles J McDonald

Dalton C MacWilliams

Marsha A Paul

William E Cohrs

Prepare a multimodal thermoplastic polymer foam having a distribution of large and small cells in a substantial absence of water by using a blowing agent stabilizer. Multimodal foams of the present invention have blowing agent stabilizer predominantly located proximate to large cells. The resulting multimodal foams have particular utility as thermal insulating materials.

Water-free preparation process for multimodal thermoplastic polymer foam and foam therefrom

The present invention provides for a process for preparing hollow polymer latexes by a one stage emulsion polymerization. The first step invloves introducing an effective amount of a first charge of a organic phase to an aqueous phase. The first charge of the organic phase comprises monomer which is vertually insoluble in the aqeuous phase and an inert-nonpolymerizable hydrocarbon. The polymer formed from polymerizing the monomer is virtually insoluble in the hydrocarbon, the hydrocarbon is virtually insoluble in the aqueous phase and the monomer is miscible with the hydrocarbon. The monomer is polymerized to produce a low molecular weight polymer such that the low molecular weight polymer will phase separate from the organic phase and conentrates at the surface of the introduced organic phase forming a low molecular weight polymer phase. The second step involves introducing a second charge of the organic phase to the aqeuous phase, wherein the second charge of the organic phase comprises a crosslinking monomer. The crosslinking monomer is polymerized with the low molecular weight polymer to produce a hollow polymer latex particle.

Method for preparing hollow latexes

Enzymes are immobilized on macroporous hydrophilic polymer beads by adsorption. The polymer beads are cross-linked, acrylate-based resins containing pendant hydroxy groups. The resins contain 10-70% methyl methacrylate, 10-70% methylacrylate, 5-14 40% ethylenically unsaturated monomer having at least one pendant hydroxyl group and 10-25% divinylbenzene. The resins provide immobilized enzyme preparations exhibiting excellent physical strength and stability as well as high enzyme activity.

Acrylate based adsorbent resin for the immobilization of enzymes

A suspending agent useful in a water-in-oil suspension polymerization process comprises a fumed silica particulate having a hydrophobic character and a hydrophobic polymer. The suspending agent is useful in providing uniformly sized aqueous fluid absorbent polymer beads.

Suspending agent for the suspension polymerization of water-soluble

Weak acid type cation exchange resins are prepared by subjecting to caustic hydrolysis a copolymer comprising in polymerized form a major amount of an acrylate monomer which is hydrolyzable under caustic conditions; a minor amount of an acrylate monomer which has a less hydrolyzable character than the hydrolyzable monomer, and an effective amount of a crosslinking monomer. For example, copolymers prepared from methyl acrylate, butyl acrylate and divinylbenzene. The resin beads so prepared exhibit increased resistance to osmotic shock.

Process for preparing improved weak acid resins and porous weak acid

Improved beads for use in the interfacial separation of anion and cation exchange beads are spherical, hydrolytically stable polymer beads having a controlled particle size, controlled density and a water wettability. The beads comprise a hydrophobic monomer, a hydrophilic monomer and a crosslinking monomer. The interface beads allow for the preparation of mixed-bed exchange resin compositions having improved life cycles and improved resin efficiencies.

Growing community of inventors

Midland, MI, United States of America

Yohannes Chonde