Basf Se Corporation

Elitsa Evstatieva

Dirk Lawrenz

Juergen Schmidt-Thuemmes

Hermann Seyffer

Guillermo Arens

Johannes Jan-Bessel Minderhoud

Jürgen Schmidt-Thümmes

Described are aqueous polymer dispersions and methods of making them. The polymer dispersions are obtainable by free-radically initiated emulsion polymerization of 19.9 to 80 parts by weight of vinylaromatic compounds, 19.9 to 80 parts by weight of acrylate monomers selected from C1-C10 alkyl acrylates and C1-C10 alkyl methacrylates, 0.1 to 10 parts by weight of ethylenically unsaturated acids, and 0 to 20 parts by weight of other ethylenically unsaturated monomers, wherein the emulsion polymerization is effected in an aqueous medium in the presence of free-radical initiators, seed latex and also at least one carbohydrate compound in the form of a degraded starch. The polymer dispersions are particularly useful in the manufacture of paper coating slips.

Polymer dispersions of vinylaromatic compounds and acrylate monomers prepared in the presence of seed latex and carbohydrate compounds

A process for the preparation of aqueous polymer dispersions is described, a vinylaromatic compound, such as, for example, styrene, a conjugated aliphatic diene, such as, for example, butadiene, and an ethylenically unsaturated carbonitrile, such as, for example, acrylonitrile, being copolymerized in an aqueous medium. The copolymerization is effected in the presence of a degraded starch and of free radical initiators. At least part of the monomers differing from ethylenically unsaturated carbonitriles are polymerized before the ethylenically unsaturated carbonitriles are added to the polymerization mixture.

Process for the preparation of aqueous polymer dispersions from a aromatic compound, a conjugated aliphatic diene and an ethylenically unsaturated carbonitrile

Aqueous polymer dispersions based on copolymers of vinyl aromatics and conjugated aliphatic dienes having a mean particle size of from 80 to 150 nm, obtained by free radical emulsion copolymerization of

Aqueous polymer dispersions based on copolymers formed from vinylaromatics and conjugated aliphatic dienes, processes for preparation thereof and use thereof

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Mannheim, Germany

Elitsa Evstatieva