The Dow Chemical Company

Inder Mani

Hamish Small

Linneaus C Dorman

James Peters

Alexander Shand

Glen L Gunderman

This invention relates to an ionic polymer, method for making a coating and a composite membrane therefrom and also relates to products derived from the disclosed methods and polymer. A new lipid-like permselective membrane is disclosed comprising an ultra-thin selective coating deposited on a non-selective but permeable substrate, which may be anionic or cationic, in hollow fiber, tubular or planar form. The method of preparation of the membrane comprises treating the permeable substrate with a solution of the ionic polymer. The polymer is the product of an aromatic monomer, acrylate and vinyl chloride quaternized with a tertiary amine in which at least one of the alkyl groups of the amine contain at least two carbon atoms. The polymer can also be the product of an aromatic monomer and acrylate and the polymer being partially sulfonated. The treatment produces an extremely thin coating that is held tenaciously by electrostatic forces and the hydrophobicity of the polymer determines its permeability. The membrane has improved flux and selectivity.

Method of making a coating and a permselective membrane, ionic polymer

Novel thermoplastic polyelectrolyte complexes are disclosed which are the reaction products of (a) a polyanion and (b) a polycation wherein one of the polyanion and polycation contains repeating units derived from a soft monomer. By the selection of said soft monomers and of the cation group present in the polycation, moldable, extrudable polyelectrolyte complexes are obtained.

Thermoplastic polyelectrolyte complexes

An emulsion polymerized latex copolymer used as a binder in paper-coating compositions with improved dry and wet binding strength comprising an ester of an ethylenically unsaturated carboxylic acid and a saturated alcohol and a hetero-unsaturated monomer selected from the group consisting of allyl acrylate, allyl methacrylate, crotyl acrylate or crotyl methacrylate. A paper-coating composition in the form of an aqueous dispersion comprising a pigment and said emulsion polymerized latex copolymer is further characterized in that said pigment is present in an amount from about 99 to about 77 weight percent based on total dry solids. A coated paper article in the form of a fibrous sheet coated on at least one surface with the paper-coating composition is also provided.

Styrene-acrylic latex containing a hetero-unsaturated monomer and

Proteins are coupled to polymer particles containing free epoxy groups in a latex. The polymer particles are about 0.15 to 1.5 micrometers in diameter, and have an inner core and an outer shell which contains the free epoxy groups. The coupled proteins are particularly useful in carrying out immunological tests.

Method of coupling a protein to an epoxylated latex

This invention is directed to cement additives comprising (1) a polymer latex containing up to about 60 parts by weight of latex polymer solids consisting essentially of (A) the polymerized product of (a) a monomer selected from the group consisting of styrene, vinyl toluene and tertiary butyl styrene, (b) an alkyl acrylate or alkyl methacrylate having from 8 to 12 carbon atoms in the alkyl group and (c) arcylamide or methacrylamide, and (B) a butadiene rubber, (2) a nonionic surfactant and (3) a polyorganosiloxane foam depressant; and to portland cement compositions containing these additives, such cement compositions being characterized by having excellent strength and adhesion to cementitious substrates.

Cement additives comprising a polymer latex containing a

Highly monodisperse latexes of non-film forming polymers are prepared by (1) dispersing a hard monomer and an ethylenically unsaturated amide in an aqueous medium containing a surfactant in an amount less than the critical micelle concentration of the surfactant and (2) subjecting the dispersion to emulsion polymerization. Such monodisperse latexes are useful as opacifying pigments in paper coatings, as internal calibration standards in electron microscopy, and as model systems for study of colloidal properties.

Highly monodisperse latexes of non-film forming polymers

Paper coatings exhibiting improved pick resistance at lower binder levels are provided by incorporating into a conventional binder a pigment comprising a copolymer of an ethylenically unsaturated hard monomer such as styrene and an ethylenically unsaturated amide such as acrylamide in the form of non-film forming discrete particles having an average particle diameter in the range from about 0.25 to about 1 micrometer.

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Midland, MI, United States of America

Inder Mani