Abstract: Water-redispersible polymer powder compositions with accelerated-setting action based on homo- or copolymers of one or more monomers of vinyl esters of optionally branched C1-15 alkylcarboxylic acids, (meth)acrylic esters of C1-15 alcohols, vinylaromatics, olefins, dienes, and vinyl halides, one or more protective colloids, and optionally antiblocking agent(s), contain one or more setting-accelerants NR3, R2N—(CH2)n—NR2, or one or more singly or doubly NH2-terminated polyalkylene glycols having a C1-C6-alkylene group is/are present, where n=from 1 to 4, and where the radicals R are identical or different, and are hydrogen, a C1-C6-alkyl radical, or a C1-C6-hydroxyalkyl radical, where at least one radical R is a C1-C6-hydroxyalkyl radical, and wherein the setting-accelerants may optionally be present in the form of their salts.

Abstract: Polyvinylacetal-grafted polymers in the form of their aqueous dispersions or water-redispersible powders, and based on emulsion or suspension polymerized base polymers of one or more monomers from the group consisting of vinyl esters, (meth)acrylates, vinylaromatics, olefins, 1,3-dienes and vinyl halides, and optionally, further monomers copolymerizable therewith, the base polymers grafted with polyvinylacetals having from 0 to 5.0 mol % of vinyl acetate units, from 75 to 95 mol % of vinyl alcohol units and from 0.1 to 20 mol % of acetal units which are derived from aldehydes having 3 to 7 C atoms, are useful as additives in construction compositions, as binders, and as adhesives, and may be dried to form readily water-redispersible polymer powders.

Abstract: A process for preparing two-phase polymers based on vinyl ester and ethylene in the form of their aqueous polymer dispersions or water-redispersible polymer powders by means of free-radical initiated emulsion or suspension polymerization of one or more vinyl esters of carboxylic acids having 1 to 12 carbon atoms and ethylene as monomers and, if desired, further monomers copolymerizable therewith, in the presence of one or more protective colloids and/or emulsifiers and, if desired, drying the resultant aqueous polymer dispersion, wherein a first polymerization phase takes place at a low ethylene pressure of P less than or equal to 20 bar and in a second polymerization phase raising the pressure to a level of greater than 20 bar to less than 60 bar, the polymer product having an ethylene distribution of less than or equal to 50% by weight of total ethylene from the first polymerization phase and greater than 50% by weight ethylene from the second polymerization phase.

Abstract: Building materials containing copolymers derived from vinyl ester, (meth)acrylic ester and optionally ethylene comonomers, stabilized with a polyvinylalcohol protective colloid, as their aqueous dispersions or as redispersible polymer powders which are redispersible in water, exhibit improved processing properties and set properties. The copolymers are obtained by emulsion or suspension copolymerization in an at least two step process wherein a) the vinyl ester component is polymerized, optionally with ethylene and further copolymerizable comonomers, to a conversion of from 90 to 100% by weight in a first step, and b) the ester(s) of (meth)acrylic acid are subsequently added and polymerized in a second step. The copolymer dispersion obtained may be dried to form a redispersible copolymer powder.

Abstract: Silicone-containing addition polymers are obtained by free-radically initiated polymerization of ethylenically unsaturated monomers, wherein the polymerization is initiated using an organopolysiloxane which contains at least one peroxide group —OOR′ in which R′ is a hydrogen atom, or a monovalent C1 to C18 hydrocarbon radical or C1 to C18 acyl radical each of which may be substituted by cyano-, fluoro-, chloro-, bromo- or organopolysiloxane and each of which may be interrupted by divalent radicals attached on both sides to carbon atoms and selected from the group consisting of —O—, —COO—, —OOC—, —CONR3—, —NR3CO—, and —CO—, where R3 is hydrogen or an optionally cyano-, fluoro-, chloro- or bromo-substituted C1 to C10 hydrocarbon radical.

Abstract: A process for preparing polyvinyl-alcohol-stabilized polymers based on vinyl ester, ethylene, and optionally other comonomers, in the form of aqueous polymer dispersions or water-redispersible polymer powders, by means of free radical initiated continuous emulsion polymerization and optionally drying the resultant polymer dispersion, comprising carrying out the emulsion polymerization in minimally two pressurized reactors arranged in series at a temperature of from 40° C. to 100° C. and at a pressure of from 5 to 100 bar, to a residual monomer content less than 3% by weight, and continuing the polymerization in minimally one unpressurized reactor at a temperature of from 20° C. to 60° C. and at a pressure of less than 1.0 bar, wherein the polymerization is initiated using a redox system made from an oxidizing component and a reducing component, at least a portion of the reducing component introduced within the first pressurized reactor.

Abstract: 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 C1 to C6-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.

Abstract: The invention relates to a process for the preparation of polymers stabilized with protective colloids in the form of water-redispersible powders or aqueous dispersions thereof having a reduced content of volatile components, by a) polymerizing by emulsion or suspension polymerization, one or more monomers from the group consisting of vinyl esters, (meth)acrylates, vinyl aromatics, olefins, 1,3-dienes and vinyl halides and optionally further monomers copolymerizable therewith, b) aftertreating the polymer dispersion thus obtained by means of postpolymerization, distillation, and/or introduction of steam or inert gas to obtain a residual content of volatile, nonaqueous components of <2000 ppm, and c) spray drying of aftertreated polymer dispersion to a residual content of volatile, nonaqueous components of <400 ppm, the dispersion being adjusted prior to spray drying to a solids content of <45% by weight before spraying, the spray drying performed with gas at an inlet temperature of >120° C.

Abstract: A process for preparing copolymers based on vinyl esters and ethylene and, if desired, further comonomers in the form of their aqueous dispersions, having a solids content of greater than 65% and a Brookfield viscosity (20 s−1) of less than 10,000 mPa·s, by means of free-radically initiated polymerization of one or more monomers selected from vinyl esters and ethylene and, if desired, further monomers copolymerizable therewith, in the presence of one or more protective colloids, polymerization being conducted in the presence of from 2 to 15% by weight of seed latex, based on the amount of vinyl ester, said process comprising a) polymerizing without adding emulsifier, and in the presence of one or more polyvinyl alcohols protective colloids having a degree of hydrolysis of from 80 to 95 mol % and a Höppler viscosity in 4% strength aqueous solution of from 3 to 30 mPa·s, and b) introducing the seed latex in a fraction of from 30 to 75% by weight before beginning the polymerization and

Abstract: 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.

Abstract: A process is for preparing polyvinyl alcohol-stabilized addition polymers based on (meth)acrylate monomers in the form of their aqueous dispersions and water-redispersible dispersion powders by means of free-radically initiated emulsion polymerization or suspension polymerization of one or more monomers selected from the group consisting of the esters of acrylic acid and methacrylic acid and, if desired, further monomers copolymerizable therewith in the presence of one or more protective colloids from the group of the polyvinyl alcohols and, if appropriate, with drying of the resultant aqueous dispersion, which includes a) conducting polymerization in the presence of from 0.001% to 0.02% by weight of initiator and, if desired, from. 0.001% to 0.

Abstract: A process for preparing aqueous dispersions or water-redispersible polymer powders of polyvinyl-alcohol-stabilized polymers based on vinyl ester(s), and ethylene, by continuous emulsion polymerization with no seed latex, and optionally drying the dispersion, by

Abstract: The invention provides a process for the preparation of polyvinyl alcohol-stabilized Polymers base on vinyl ester, (meth)acrylate, and optionally ethylene monomers In the form of their aqueous dispersions and dispersion powders redispersible in water, by means of free radical emulsion polymerization of suspension polymerization of one or more monomers from the group consisting of the esters of acrylic acid and methacrylic acid with vinyl esters, optionally ethylene and optionally further monomers copolymerizable therewith, in the presence of one ormore polyvinyl alcohol protective colloids, and option ally drying of the aqueous dispersion obtainable thereby, wherein a) from 50 to 100% by weight of the total weight of vinyl ester monomers employed, from 0 to 40% by weight of the total weight of (meth)acrylate monomers employed and at least 80% by weight of the total weight of ethylene employed are initially introduced in the polymerization and b) the polymerization is carried out at a temperature of ≧60&d

Abstract: 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.

Abstract: 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.

Abstract: Building materials containing copolymers derived from vinyl ester, (meth)acrylic ester and optionally ethylene comonomers, stabilized with a polyvinylalcohol protective colloid, as their aqueous dispersions or as redispersible polymer powders which are redispersible in water, exhibit improved processing properties and set properties.

Abstract: The invention relates to a fast-drying rendering and coating composition comprising a binder in the form of an aqueous polymer dispersion or of a water-redispersible polymer powder, and also an organic precipitant, if desired in combination with an inorganic precipitant.

Abstract: The use of water-redispersible polymer powders based on protective colloid stabilized vinyl ester polymers in building adhesive compositions, wherein the vinyl ester polymers contain from 0.2 to 1.5% by weight, based on the overall weight of the vinyl ester polymers, of auxiliary monomer units derived from monomers having a higher water solubility than vinyl acetate.

Abstract: Solventlessly preparable coating compositions for producing soiling-resistant coatings, comprise:

Abstract: The invention relates to a process for the preparation of polymers stabilized with protective colloids in the form of water-redispersible powders or aqueous dispersions thereof having a reduced content of volatile components, by