Wacker-chemie Gmbh

Wecker-chemie Gmbh

Joachim Schulze

Peter Ball

Klaus Marquardt

Manfred Selig

Konrad Alfons Wierer

Manfred Hannebaum

Johannes Kinkel

Walter Ernet

Gerhard Brink

Willibald Burger

Peter Huber

Klaus Adler

Reiner Figge

Reinhard Haerzschel

Ernst Innertsberger

Jakob Schmidlkofer

Hardy Herold

Bernd Schilling

Rainer Figge

Otmar Killermann

Karl E Fickert

Juergen Hinterwinkler

This invention covers the use of cross-linkable redispersible dispersion powders based on vinyl ester copolymers or (meth)acrylic acid ester copolymers as binders for the dry binding of fiber materials.

Crosslinkable dispersion powders as binders for fibers

Crosslinkabel dispersion powders as binders for fibers

The invention provides a redispersibte dispersion powder composition comprising a) a base polymer selected from the group consisting of vinyl ester polymers, styrene polymres, acrylate polymers and vinyl chloride polymers, b) from 2 to 15% by weight, based on the weight of the base polymer, of polyvinyl alcohol having a degree of hydrolysis of from 85 to 95 mol % and a Hoppler viscosity of from 2 to 25 mPa.s, c) from 3 to 30% by weight, based on the total weight of polymeric components, of fine antiblocking agent, and d) from 1 to 15% by weight, based on the weight of the base polymer, of an aminofunctional polyvinyl alcohol soluble in cold water and having a Hoppler viscosity of from 1 to 20 mPa.s and a saponification number of from 0 to 250, which comprises residues of aminofunctional vinyl units of the formula CH.sub.2 .dbd.CH--(CH.sub.2).sub.x --NH.sub.2, wherein x is a number of from 0 to 4. The dispersion powder compositoin of the invention is particularly suitable for use in building materials, in particular, dry mortars comprising Portland cement as inorganic binder, and leads in these to increased adhesive strength of the mortar.

Redispersible dispersion powder composition

The invention relates to the use of polypropylene glycol as a shrinkage-reducing additive in dispersion powder compositions for construction materials containing

Use of polypropylene glycol as a shrinkage-reducing additive in

A finely-divided, monomodal protective-colloid stabilized aqueous dispersion of a copolymer of at least 75% by weight of units of vinyl chloride and ethylene and optionally copolymerized with up to 25% by weight of units of additional monomers unsaturated at the ethylene bond and having a solids content of 45 to 70% by weight, characterized in that the dispersions are not partially flocculated, the polymer has a mean particle size of 150 to 500 nm measured as mean weight in a disc centrifuge and a polydispersion index of not more than 1.8 and less than 50% of the polymer particles are larger than 1,000 nm and a process for the preparation thereof using a single step radical polymerization of vinyl chloride, ethylene and optionally additional monomers such as vinyl esters useful as dispersion powders, adhesives, binders and concrete additives.

Finely-divided vinyl chloride-ethylene copolymers stabilized by

The invention relates to a redispersible powder composition comprising

Redispersible powder composition

A process is provided for the preparation of polyvinyl alcohols absorbed onto pigments. In the process 10% to 30% strength by weight of aqueous solutions of partially hydrolyzed polyvinyl alcohols or fully or partially hydrolyzed vinyl alcohol copolymers, which are soluble in cold water, are spray-dried after the addition of 20% to 40% by weight, relative to the total solids content of the resulting suspension, of organic or inorganic pigments, preferably chalk. The invention is also directed to the pulverulent product and its use, wherein the product is distinguished by good flow capacity and an extremely low methanol content. It is suitable for use as a binder in paper coating compositions and in coatings for the surface finishing of paper and cardboard.

Process for the preparation of polyvinyl alcohols which are soluble in

The invention relates to antifoam compositions containing an essentially linear organopolysiloxane, a silicone resin containing essentially triorganosiloxy and SiO.sub.4/2 units, and a filler.

Antifoam compositions

A novel process for the preparation of a readily dispersible, pourable dispersion powder comprising emulsion polymerizing in the presence of a free radial initiator a mixture of 1 to 50% by weight of ethylene and 99 to 50% by weight of an ethylenically unsaturated comonomer phase comprising at least one member of the group consisting of (a) 60 to 100% by weight of vinyl chloride, (b) 0 to 40% by weight of monoethylically unsaturated, oil-soluble monomers, (c) 0 to 10% by weight of monoethylenically unsaturated water-soluble monomers having functional groups and (d) 0 to 5% by weight of oil-soluble monomers that are monoethylenically unsaturated and have functional groups or are multiple ethylenically unsaturated and optionally a protective colloid and/or emulsifier at an ethylene pressure of 10 to 150 bar to obtain an aqueous dispersion of a vinyl chloride-ethyelene copolymer, optionally adding to the aqueous dispersion (e) 0 to 40% by weight, based on the VCE-polymer, of at least one water-soluble substance having a T.sub.g .gtoreq.60.degree. C., (f) 0 to 1% by weight, based on the VCE-polymer, of an antifoaming agent, and (g) 0 to 30% by weight, based on the total weight of polymer constituents, of a finely divided antiblocking agent and spray drying or freeze drying the aqueous dispersion to obtain the readily redispersible, pourable powder of a vinyl chloride-ethylene copolymer and the powder produced by the said process and improved coatings, paints, glues and adhesives containing the said redispersible powder.

Process for emulsion polymerization

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Burghausen, Germany

Joachim Schulze