Wacker-chemie Gmbh

Wacker Polymer Systems Gmbh & Co. Kg

Wacker Chemie Ag

Theo Mayer

Hans-Peter Weitzel

Peter Ball

Thomas Bastelberger

Andreas Bacher

Reinhard H&auml;rzschel

Reinhard Haerzschel

Ulf Dietrich

Herbert Eck

Jochen Dauth

Kurt Stark

Hermann Lutz

Harald Zeh

Hans Lautenschlager

Peter Fritze

Werner Bauer

Karl Ernst Fickert

Wolfgang Keller

Bernd Schilling

Peter Weitzel

Karl-Ernst Fickert

Bernd Kayser

Reinold H&auml;rzschel

Compositions useful for preparing coating slips for inkjet recording materials include a pulverulent silane-modified fully or partially hydrolyzed polyvinylalcohol and a redispersible polymer powder.

Compound of a powdery coating agent

Silane-modified polyvinyl alcohol mixtures comprising:

Silane-modified polyvinyl alcohol mixtures

Thermoplastic silicon block copolymers containing (A) a hard segment polymer constituent prepared from styrene, methylmethacrylate, butylacrylate, acrylonitrile, vinyl monomers, or mixtures therefore, and (B) a soft segment polymer constituent of general formula (I) G-&lsqb;(SiR O) SiR &mdash;X&mdash;&rsqb; (SiR O) SiR -G wherein R is an optionally halogenated monovalent C hydrocarbon radical and X is a specific aryl group-containing, silicon bonded radical, and each G may be a radical (A)-Z-(Si) or Z&prime;-(Si) wherein -Z- represents an aryl group-containing bivalent radical and Z&prime;- represents a monovalent aryl group-containing radical, provided that there is, at most, one radical G and one radical Z&prime;- in formula (I). In formula (I), m represents a whole number between 1 and 1000 and n represents 0 or a whole number between 1 and 20, provided that when n does not equal 0, 4&lE;n&middot;m&lE;1000.

Thermoplastic silicone block copolymers, the production thereof and the use of the same

The invention relates to a method for reducing odor emissions of aqueous aromatic vinyl-1,3-diene-copolymer dispersions which have been stabilized with a protective colloid. The invention also relates to redispersion powders obtained by drying said dispersions. This is achieved by emulsion polymerization of a mixture containing at least one aromatic vinyl and at least one 1,3-diene in the presence of one or more protective colloids and by optionally drying the polymer dispersion obtained thereby. The invention is characterized in that 0.01 to 15.0 wt. % of one or more monomers selected from the group of branched or unbranched alkyl esters containing 1 to 8 carbon atoms in the alkyl radical of monounsaturated mono- or dicarboxylic acids are added at the end of the polymerization when the total content of the aqueous polymer dispersion containing free monomers ranges from >0 to &lE;20 wt. %, whereby the given wt. % refers to the polymer content of the dispersion.

Process for reducing the odor of vinylaromatic-1,3-diene copolymer dispersions stabilized by protective colloids

Dry mortar formulations modified with water-redispersible polymer powders

The invention provides mixed aromatic vinyl-1,3-diene polymers stabilized by a protective colloid and present in the form of aqueous polymer dispersions or polymer powders redispersible in water as adhesives for porous substrates. The polymer dispersions and the polymer powders are obtained by emulsion polymerization of a mixture containing: a) 20 to 80 percent by weight of one or more vinylaromatics; b) 19.9 to 79.9 percent by weight of one or more 1,3-dienes; c) 0.1 to 15 percent by weight of one or more comonomers from the group consisting of N-methylolacrylamide, N-methylolmethacrylamide and the N-(alkoxymethyl)-acrylamides and N-(alkoxymethyl)-methacrylamides with a C to C -alkyl radical. The sum of the above percentages adds up to 100% by weight. Emulsion polymerization is carried out in the presence of one or more protective colloids and without emulsifiers, optionally followed by drying of the resulting aqueous polymer dispersion.

Vinylaromatic/1,3-diene copolymer stabilized with protective colloids as adhesives for porous substrates

Self-leveling screeds and trowel-applied flooring compositions are provided containing dispersion powder compositions based on vinylaromatic-1,3-diene copolymers. The use of these copolymers in the flooring compositions dispensing with the need for fully hydrolyzed copolymers made from 1-alkylvinyl esters and from vinyl esters while obtaining good wear resistance, scratch resistance and adhesion.

Self-leveling screeds and trowel-applied flooring compositions containing dispersion powder compositions based on vinylaromatic-1,3-diene copolymers

A method is provided for producing protective colloid-stabilized vinyl aromatic-1.3-diene-copolymers in the form of their aqueous polymer dispersions or in the form of a powder which can be re-dispersed in water, by emulsion-polymerizing a mixture containing at least one vinyl aromatic and at least one 1,3-diene in the presence of a protective colloid and optionally, drying the resulting polymer dispersions. In the method part of the protective colloid is provided straightaway and part is metered.

Process for preparing protective-colloid-stabilized vinylaromatic-1,3-diene copolymers

The invention relates to thickeners based on fully or partially hydrolyzed vinyl alcohol copolymers with a molecular weight Mw greater than 100,000, obtainable by hydrolyzing vinyl acetate copolymers which, besides vinyl acetate units, also contain comonomer units which derive from one or more comonomers selected from the group consisting of 1-(C )-alkylvinyl esters of C carboxylic acids, allyl esters, vinyl esters of alpha-branched C carboxylic acids, and C -alkyl (meth)acrylates, in the form of their aqueous solution or in powder form.

Thickeners based on vinyl alcohol copolymers

The vinyl aromatic-1,3-diene copolymers stabilized with protection colloids are used in the form of aqueous polymer dispersions or water-redispersible polymer powders for modifying materials that contain plaster or calcium carbonate. The polymer dispersions or polymer powders are obtained by the emulsion-polymerization of a mixture containing at least one vinyl aromatic and at least one 1,3-diene in the presence of at least one protection colloid and without any emulsifier, and by optionally drying the aqueous polymer dispersions thus obtained.

Vinyl aromatic-1,3-diene copolymers stabilized with protection colloids used for modifying materials containing plaster or calcium carbonate

The invention relates to the utilization of aqueous polymer dispersions or of polymer powders which can be redispersed in water and which are based on protective colloid-stabilized aromatic vinyl-1,3-diene-copolymers in adhesive formulations used in the building industry, whereby the polymer dispersion and the polymer powders are produced by emulsion polymerization of a mixture containing at least one aromatic vinyl and at least one 1,3-diene in the presence of one or more protective colloids, without using an emulsifier, and by optionally drying of the aqueous polymer dispersion obtained thereby.

Use of Vinylaromatic/1,3-diene copolymers stabilized with protective colloids in building adhesive formulations

The invention discloses polyvinyl alcohol-stabilized copolymers of 1,3-dienes with methacrylates and/or acrylates in the form of their aqueous polymer dispersions or polymer powders redispersible in water, and to a process for their preparation and their use.

Polyvinyl alcohol-stabilized 1,3-diene/ (meth)acrylate copolymers

A process for reducing the odor emission of aqueous vinylaromatic/1,3-diene copolymer dispersions and of redispersion powders obtainable therefrom by drying, is by emulsion polymerization of a mixture containing at least one vinylaromatic and at least one 1,3-diene in the presence of one or more surfactant substances and optionally drying of the polymer dispersion obtained thereby. There are 0.01% to 15.0% by weight of one or more monomers of the branched or straight-chain alkyl esters having 1 to 8 C atoms in the alkyl radical of monounsaturated monocarboxylic or dicarboxylic acids and 0.01% to 15.0% by weight of one or more monomers based upon the vinyl esters of branched or straight-chain aliphatic carboxylic acids having 1 to 10 C atoms which are added in one step or in two successive steps toward the end of the polymerization, when the total content of free monomers in the aqueous copolymer dispersion is in the range from &gE;0 to &lE;20% by weight. It is also possible optionally to add the vinyl ester fraction as early as the beginning of or during the polymerization. The data in % by weight is based in each case on the polymer content of the dispersion.

Process for reducing the odor emission of aqueous vinylaromatic/1,3-diene copolymer dispersions

Process for the preparation of vinylaromatic copolymer redispersion powders redispersible in water

A method for producing protective-colloid-stabilized polymers in the form of their aqueous polymer dispersions or in the form of powders which can be re-dispersed in water, wherein one or several monomers from the group made up of vinyl aromatics, 1.3 dienes, acrylic acid esters and methacrylic acid esters of alcohols with 1 to 15 C-atoms are polymerized in the presence of a combination of protective colloids consisting of one or several protective colloids from the group of hydrophobically modified, partly saponified polyvinyl esters which produce a surface tension of &lE;40 mN/m as a 2% aqueous solution, and one or several protective colloids which produce a surface tension of >40 mN/m as a 2% aqueous solution.

Growing community of inventors

Julbach, Germany

Theo Mayer