Wacker Chemie Ag

Wacker-Chemie Gmbh

Wacker Polymer Systems Gmbh & Co. Kg

Udo Kotschi

Hans-Peter Weitzel

Peter Ball

Kurt Stark

Harald Zeh

Peter Tschirner

Manfred Hannebaum

Klaus Bonin

Jessica Hain

Klaus B&uuml;ppelmann

Lada Bemert

Klaus Büppelmann

A powder paint composition. The powder paint composition contains (a) at least one polymer powder which can be re-dispersed in water, (b) pigment and filler, and optionally (c) which may be one or more adjuvants and/or may be one or more hydraulic binders. The at least one polymer powder which can be re-dispersed in water contains a polyvinyl alcohol-stabilized copolymer that is based on (a1) a wt % of a vinyl acetate, (a2) a wt % of ethylene and optionally (a3) and/or (a4) wherein (a3) is vinyl esters of long-chain, optionally branched Cto Ccarboxylic acids and (a4) is further ethylenically unsaturated comonomers that are co-polymerizable therewith.

Powder paint composition which can be redispersed in water

A process for aqueous, free-radically initiated, continuous emulsion polymerization of A) at least one vinyl ester and optionally at least one (meth)acrylic ester, B) ethylene, and C) 0 to 10% by weight of one or more ethylenically unsaturated, functionalized comonomers, in the presence of 3.0 to 12.5% by weight of one or more emulsifiers, where at least 50% by weight are nonionic emulsifiers, and 0 to 10% by weight of one or more protective colloids, in a stirred tank cascade with at least two pressure reactors connected in series and with at least one low-pressure reactor connected downstream.

Process for continuous emulsion polymerization

Functionalized copolymers for preparing coating compositions

The invention relates to a process for preparing protective-colloid-stabilized vinyl ester or vinyl ester-ethylene polymers in the form of their aqueous dispersions by emulsion polymerization in the presence of one or more protective colloids, which comprises carrying out the polymerization in the presence of a hydrophobic but silane-free protective colloid based on (meth)acrylate polymers with from 80 to 95% by weight, based on the total weight of the copolymer, of acrylic or methacrylic esters of aliphatic alcohols having from 1 to 12 carbon atoms, and from 5 to 20% by weight, based on the total weight of the copolymer, of ethylenically unsaturated mono- or dicarboxylic acids, and with a glass transition temperature Tg of the copolymer of from 60 to 120&deg; C., and with a Fikentscher K value of the copolymer of from 20 to 50.

Process for preparing protective-colloid-stabilized vinyl ester or vinyl ester-ethylene polymers in the form of their aqueous dispersions

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Burghausen, Germany

Udo Kotschi