Wolff Walsrode Ag

Bayer Aktiengesellschaft

Werner Karstens

Helmut Huhn

Lutz Hoppe

Heinrich Alberts

Klaus Szablikowski

Siegfried Korte

Wolfgang Koch

Eugen Reinhardt

Branislav Bohmer

Hans-Gunter Poersch-Panke

The invention relates to a process for the continuous production of polyacrylonitrile hydrolyzates and to their use as dispersion and grinding aids for pigments and fillers, such as for example kaolin, CaCO.sub.3 or gypsum.

Process for the production of low molecular weight acrylonitrile

Process for the preparation of aqueous solutions of hydrolysed styrene/acrylonitrile copolymers, the carboxyl groups of which are entirely or partly present as NH.sub.4 and/or alkali metal salt, characterized in that

Process for the preparation of water-soluble copolymers

Water swellable substances based on crosslinked polyacrylonitrile hydrolysates, preferably in granulate form useful for improving water retention in sandy soils and plant substrates.

High molecular weight water-swellable substances

A process for the production of water-soluble hydrolyzed polyacrylonitrile polymers, wherein the acrylonitrile is polymerized in the presence of 1-8% by weight of hydrolyzed polyacrylonitrile and hydrolyzed without intermediate isolation from the reaction mixture.

Process for the production of water-soluble hydrolyzed products of

Aqueous polymer mixture, process for its preparation and its use as substrate anchoring, blocking resistant one-coat sealing lacquer on sheet products. An aqueous polymer mixture containing at least two polymeric components A and B, A being present in form of an aqueous dispersion and consisting of micronuclear shell structures comprising as nuclear portion a copolymer of methyl acrylate, ethyl acrylate, acrylic acid, methacrylic acid -n-butyl ester and/or methyl methacrylate and vinylidene halide and as shell portion a copolymer of methyl acrylate, ethyl acrylate, ethyl methacrylate ethyl hexyl acrylate, n-butyl (meth)acrylate and/or itacaconic acid and vinylidene halide; and B being present in form of an aqueous alkaline solution and consists of a (co)polymer of unsaturated carboxylic acid amide -N-methylol derivatives and optionally unsaturated carboxylic acids and/or amides of said acids.

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Bomlitz, Germany

Werner Karstens