Basf Aktiengesellschaft

Peter Claassen

Joachim Pakusch

Maximilian Angel

Hermann Seyffer

Andree Dragon

Onno Graalmann

Marinus Visseren

Eckehardt Wistuba

Karl-Heinz Schumacher

Ulrike Licht

Bernd Reck

Roelof Balk

Thomas Wirth

Karl Haberle

Marc Leduc

Hans-J&uuml;rgen Denu

J&uuml;rgen Schmidt-Th&uuml;mmes

Wolfgang Alois Hormuth

Werner Gauweiler

Pulakesh Mukherjee

Kai Olfermann

Claudia Heibel

Titus Leman

Gerhard Blatz

Albrecht Seher

Leonardus Aan Meulen

Roland Nowack

An aqueous dispersion of water-soluble polymers obtained by free radical polymerization of ethylenically unsaturated anionic monomers in an aqueous medium in the presence of a stabilizer, wherein the stabilizer comprises: (a) at least one water-soluble polymer selected from the group consisting of a graft polymer of vinyl acetate and/or vinyl propionate on polyethylene glycol, a polyethylene glycol blocked at one or both terminal groups with an alkyl, a carboxyl or an amino group, and a copolymer of alkyl polyalkylene glycol methacrylate and methacrylic acid; and (b) at least one water-soluble polymer selected from the group consisting of a hydrolyzed copolymer of vinyl alkyl ether and maleic anhydride in the form of free carboxyl groups or in the form of salts at least partially neutralized with one or more alkali metal hydroxides or one or more ammonium bases, a cationically modified potato starch, an anionically modified potato starch, a degraded potato starch and maltodextrin.

Aqueous dispersions of hydrosoluble polymerisates of ethylenically unsaturated anionic monomers, method for the production and use thereof

A process for impregnating base paper or fiber webs with an aqueous dispersion of a polymer of free-radically polymerizable compounds (monomers), which comprises from 0.1 to 5% by weight of the monomers being methacrylic acid.

Polymer dispersion for impregnating paper

Process for preparing pulverulent polymers by drying aqueous polymer dispersions

Preparation of polymer powders

The invention provides for a process for preparing pulverulent polymers by drying aqueous polymer dispersions in the presence of copolymers based on ethylenically unsaturated C.sub.3 -C.sub.6 carboxylic acids and their hydroxyalkyl esters as assistants; polymer powders obtainable by this process; aqueous polymer dispersions obtainable by free-radical aqueous emulsion polymerization of ethylenically unsaturated monomers in the presence of the novel copolymers, and the powders obtainable therefrom, and a polymeric binder as well as and mineral building materials which comprise the novel polymer powders.

Process for preparing pulverulent polymers by drying aqueous polymer

In a process for preparing coarse polymer dispersions Pg where a mixture M comprising at least one conjugated diene monomer A and at least one ethylenically unsaturated comonomer B is polymerized by free-radical aqueous emulsion polymerization in the presence of an emulsifier E and with or without further additives to form a fine polymer dispersion Pf and said fine polymer dispersion Pf is agglomerated to form a coarse such dispersion Pg, the agglomeration is carried out using a combination of chemical agglomeration and pressure agglomeration; the invention also relates to such coarse polymer dispersions and their use.

Preparing coarse polymer dispersions

A process for producing sterile nonwovens comprises a textile fabric composed of a fiber web being impregnated with an aqueous dispersion comprising a polyurethane, then dried and irradiated with .gamma.-rays.

Sterile nonwovens bonded using polyurethane dispersions

An aqueous polymer dispersion is prepared by free radical aqueous emulsion polymerization of a mixture of monomers having at least one ethylenically unsaturated group, which comprises at least 30% by weight of monomers having two conjugated ethylenically unsaturated double bonds, by a process in which the polymerization temperature is varied in the course of the free radical aqueous emulsion polymerization.

Preparation of an aqueous polymer dispersion

Aqueous polymer dispersions whose polymer is built up of

Aqueous polymer dispersions

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Ludwigshafen, Germany

Peter Claassen