Abstract: Described are aqueous polymer dispersions and a method for producing them. The polymer dispersions comprise polymer particles having an average particle diameter of greater than 200 nm, monomodal particle size distribution, and uniform glass transition temperature, and are prepared by radical emulsion polymerization of a monomer mixture comprising ethylenically unsaturated, radically polymerizable monomers, using a polymer seed, less than 0.8 part by weight of emulsifier, and without protective colloids. The monomer mixture consists of a) at least 60 wt % of at least one monomer selected from the group consisting of C1 to C20 alkyl acrylates, C1 to C20 alkyl methacrylates, vinyl esters of carboxylic acids containing up to 20 carbons, vinylaromatics having up to 20 carbons, ethylenically ensaturated nitriles, vinyl halides, vinyl ethers of alcohols containing 1 to 10 carbons, aliphatic hydrocarbons having 2 to 8 carbons and one or two double bonds, and mixtures of these monomers, b) at least 0.

Abstract: Described is a process for preparing an aqueous polymer dispersion from ethylenically unsaturated, free-radically polymerizable monomers. In a first stage, a first polymer is prepared by free-radical emulsion polymerization. In a second stage, an aqueous polymer dispersion is prepared in the presence of the first polymer. The monomers of the first stage comprise monomers with acid groups. The polymerization of the first stage takes place at a low pH of less than 5. The acid groups of the first polymer are neutralized during the polymerization of the second stage to an extent such that the pH of the polymer dispersion at the end of the second stage is greater than 5. The aqueous polymer dispersions can be used as adhesives for producing composite films.

Abstract: Described is a process for preparing an aqueous polymer dispersion from ethylenically unsaturated, free-radically polymerizable monomers. In a first stage, a first polymer is prepared by free-radical emulsion polymerization. In a second stage, an aqueous polymer dispersion is prepared in the presence of the first polymer. The monomers of the first stage comprise monomers with acid groups. The polymerization of the first stage takes place at a low pH of less than 5. The acid groups of the first polymer are neutralized during the polymerization of the second stage to an extent such that the pH of the polymer dispersion at the end of the second stage is greater than 5. The aqueous polymer dispersions can be used as adhesives for producing composite films.

Abstract: An aqueous composition comprises a mixture of from 10 to 50% by weight of a polymer A) having a gel content of less than 40% by weight and a number-average molecular weight Mn of the soluble fractions of less than 30,000 and from 50 to 90% by weight of a filler B), the amounts by weight being based on the weight sum of the polymer and of the filler.

Abstract: Adhesives comprising: a) from 5.0 to 95.0% by weight of an adhesive dispersion having a viscosity in the range from 2000 to 10,000 mpPa·s, which comprises (a1) an aqueous polymer dispersion which is obtainable by free-radical polymerization of a mixture M which comprises at least one ethylenically unsaturated monomer A to give a polymer P in the presence of at least one protective colloid-based on a water-soluble prepolymer which comprises at least one water-soluble monomer B, and further additives if desired, (a2) if desired, a base selected from the group consisting of alkali metal.hydroxides, ammonia and volatile organic amines, (a3) if desired, a completely water-miscible organic solvent, and, further additives; (b) from 0 to 90.0% by weight of a polysaccharide and/or a protein and/or a protein degradation product; (c) from 0 to 95.0% by weight of at least one filler; (d) from 0 to 10.0% by weight of at least one emulsifier; (e) from 0 to 30.