Wacker Chemie Ag

Wacker-chemie Gmbh

Wacker Polymer Systems Gmbh & Co. Kg

Consortium Fur Elektrochemische Industrie Gmbh

Wacker Polymers Systems Gmbh & Co. Kg

Hans-Peter Weitzel

Robert Braunsperger

Theo Mayer

Peter Ball

Reiner Figge

Harald Zeh

Peter Fritze

Hermann Lutz

Bernhard Eckl

Udo Kotschi

Franz-Heinrich Kreuzer

Ulf Dietrich

Peter Tschirner

Stefan Killat

Muhammad Babar

Reinhard H&auml;rzschel

Wolf-Dieter Hergeth

Herbert Eck

Richard Weidner

Kurt Stark

Klaus Marquardt

Manfred Selig

Frank Sandmeyer

Thomas Bastelberger

Reinhard Haerzschel

Horst Leigeber

Klas Sorger

Klaus Bonin

Manfred Hannebaum

Franz Jodlbauer

Andreas Bacher

Helmut Zecha

Oliver Minge

Mehmet Guenaltay

Robert Maurer

Peter Boldt

Ingo P Zahn

Jessica Seidel

Gerhard Kögler

Mehmet Gunaltay

Bernd Schilling

Karl Ernst Fickert

Werner Bauer

Dirk Kutschera

Reinold H&auml;rzschel

Michael Kalchauer

Lada Bemert

Susanne Weber-Koegl

Sotirios Chatzinerantzis

Jobst Leupold

Josef Eisenlauer

Mathias Wiedemann

Jessica Hain

Andrea Schorm

Doris Bauer

Stefan Baueregger

Mehmet Günaltay

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

The invention relates to a method for producing polymer powder compositions which are redispersible in water and which are based on polymerisates of one or more ethylenically unsaturated monomers. In a first step, an aqueous polymerisate dispersion is produced by means of a radically initiated polymerization of one or more ethylenically unsaturated monomers in an aqueous medium, said polymerisate dispersion being convened into the polymer powder composition which is redispersible in water by means of a diving process. The invention is characterized in that the polymerization and the drying process are each carried out in a continuous manner, and the polymerization and the diving process are carried out in separate interconnected modules.

Continuous and modular process for producing water-redispersible polymer powder compositions

A polymerization reactor for producing aqueous polymer dispersions by radically initiated emulsion polymerization of one or more ethylenically unsaturated monomers in the presence of one or more protective colloids and/or emulsifiers, is cleaned by initially charging an aqueous mixture comprising one or more ethylenically unsaturated monomers, one or more protective colloids and/or emulsifiers, but no oxidation initiator, the proportion of ethylenically unsaturated monomers being 20 to 70% by weight of the aqueous mixture, heating the aqueous mixture to a temperature of 50° C. to 100° C. for 5 minutes to 3 hours, adding one or more initiators and optionally further starting materials, initiating polymerization, removing the aqueous polymer dispersion thus obtained from the polymerization reactor and post-treating the dispersion to remove wall deposits detached during the process.

Method for cleaning a polymerisation reactor

Aqueous polymer dispersions are produced by radically initiated emulsion polymerization of ethylenically unsaturated monomers in the presence of protective colloids and/or emulsifiers in a continuously operated tubular reactor, characterized in that the direction of flow of the reactor contents is reversed along the longitudinal axis of the reactor over the course of polymerization.

Method for producing aqueous polymer dispersions in a tube reactor

A hydrophobic, water-redispersible polymer powder composition contains

Hydrophobic, water-redispersible polymer powder composition

Open time and creep resistance of hydraulically settable inorganic construction materials such as mortars and tile adhesives are both improved at the same time by the addition of a polymer mixture in the form of an aqueous dispersion or water-redispersible powder, containing one or more protective colloid-stabilized polymers having units derived from 20% to 30% by weight of vinyl chloride, 50% to 75% by weight of vinyl acetate, 5% to 20% by weight of ethylene, and one or more protective colloid-stabilized, vinyl halide-free polymers of one or more ethylenically unsaturated monomers.

Polymer blends in the form of aqueous dispersions or powders that can be redispersed in water

Subjects of the invention are processes for preparing vinyl acetate-ethylene copolymers in the form of their aqueous dispersions or water-redispersible powders by means of radically initiated emulsion polymerization and optional subsequent drying of the resultant polymer dispersions, characterized in that the emulsion polymerization of vinyl acetate, ethylene and optionally one or more further ethylenically unsaturated monomers is carried out in the presence of one or more protective colloids in one or more Taylor reactors.

Process for preparing vinyl acetate-ethylene copolymers by emulsion polymerization

The invention relates to a method for applying dispersion adhesives containing one or more polyvinyl esters and optionally one or more additives, characterized in that one or more polyvinyl esters are produced by radical-initiated, continuous emulsion polymerization of a) one or more vinyl esters and, optionally, b) one or more additional ethylenically unsaturated monomers, and the dispersion adhesives are applied to a substrate by way of mechanical application methods.

Method for applying dispersion adhesives

Methods for producing protective-colloid-stabilized aqueous dispersions of vinyl ester, polymers having weight-average particle diameters Dw of 120 nm to 1,500 nm and a polydispersity PD&#x3c;1.6 include radically initiated emulsion polymerizations of one or more vinyl esters and optionally one or more additional ethylenically unsaturated monomers in aqueous medium in the presence of one or more protective colloids, wherein an aqueous mixture containing 0 to 90 grams of one more protective colloids per liter of water is provided to the receiver (concentration (C)), and starting with or after the start of the metered addition of one or more initiators, one or more protective colloids and the total amount of vinyl esters used are added in a metered manner, the emulsion polymerizations being performed in the absence of vinyl halogenides.

Method for producing vinyl ester polymers having specifically settable dispersity and low polydispersity

A method for processing wastewater and exhaust gas condensates from the polymerization of vinyl acetate and ethylene and optionally other comonomers in an aqueous medium by suspension or emulsion polymerization employs relieving pressure after completion of the polymerization of the polymerization batch and discharging the polymer dispersion. During the relieving, the gaseous phase is removed by means of a compressor. Optionally, the gaseous phase occurring during stripping is removed by the compressor and cooled by one or more heat exchangers before entry into the compressor. The liquid phases occurring in the compressor and optionally in the heat exchanger are separated from the gaseous phase and the liquid phases are given to a rectification column, and separated into a vinyl acetate monomer phase and a wastewater phase, and the vinyl acetate monomer phase is resupplied to polymerization.

Method for processing wastewater and exhaust gas condensates from the polymerization of vinyl acetate and ethylene in an aqueous medium

A process for preparing a polymer in the form of an aqueous dispersion or a water-redispersible powder includes free-radically initiated heterophase polymerization of one or more ethylenically unsaturated monomers and optionally subsequent drying of the polymer dispersions obtained, wherein the polymerization is performed in a jet loop reactor.

Process for producing polymers by means of emulsion or suspension polymerization in a jet loop reactor

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

A method for producing aqueous polymer dispersions by means of radically initiated emulsion polymerisation, in an aqueous medium, of vinyl ester and ethylene, in series-connected polymerisation reactors, wherein in a first discontinuous polymerisation phase at least some of the reactants are introduced into the first polymerisation reactor and the remainder is added in a metered fashion. The reactor is filled up to more than 90% by volume, and at least 90 wt % of the monomers are reacted; in a second continuous polymerisation phase, the reactants are continuously supplied to the first polymerisation reactor and product is continuously withdrawn, and the product is continuously transferred into a second polymerisation reactor, and in the second polymerisation reactor the polymerisation is continued until at least 98 wt % of the monomers used have reacted.

Semi-continuous method for emulsion polymerisation

Redispersible polymer powders which are cationically stabilized by spray drying a polymer dispersion with a cationic polymer can be used in higher concentrations in chemical building construction materials without introducing adverse properties.

Process for producing cationically stabilized and water-redispersible polymer powder compositions

Protective-colloid-stabilized polymers in the form of their aqueous dispersions or of their water-redispersible powders are based on homo- or copolymers of one or more monomers from the group consisting of vinyl esters of optionally branched alkyl carboxylic acids having from 1 to 15 carbon atoms, (meth)acrylic esters of alcohols having from 1 to 15 carbon atoms, vinylaromatics, olefins, dienes, and vinyl halides, wherein partially hydrolyzed vinyl acetate-ethylene copolymers with an ethylene content of from 1 to 15 mol %, a degree of hydrolysis DH of the vinyl acetate units of 80 mol %&#x3c;DH&#x3c;95 mol %, and a H&#xf6;ppler viscosity in 4% by weight aqueous solution of from 2 to 30 mPas, are present as protective colloids.

Protective-colloid-stabilized polymers in the form of their aqueous dispersions or of their water-redispersible powders

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Reischach, Germany

Hans-Peter Weitzel