Abstract: A casting mold made of a copper material having a casting surface (2) that faces a metal melt, at least one expansion joint (3) being situated in the casting surface (2); the expansion joint (3) having a width (B) that is so small that, during the casting process, no metal melt penetrates into the expansion joint (3).

Abstract: A casting mold made of a copper material having a casting surface (2) that faces a metal melt, at least one expansion joint (3) being situated in the casting surface (2); the expansion joint (3) having a width (B) that is so small that, during the casting process, no metal melt penetrates into the expansion joint (3).

Abstract: A dispersion powder composition based on water-insoluble polymers with particularly low water absorption comprises, based on the total weight of the polymer, an amount in the range from 0.1 to 30% by weight of at least one carboxylic ester whose acid component has at least 6 carbon atoms and whose alcohol component is a polyhydroxy compound, preferably glycerol, diglycerol, or triglycerol. This is prepared by mixing polymer and protective colloid with the carboxylic ester to prepare a dispersion and then, where appropriate, drying this with simultaneous admixing of an anticaking agent, and gives good results when used for modifying wallpaper pastes, mortars, or concrete.

Abstract: The invention relates to a dispersion powder containing: a) at least one emulsion polymer from the group consisting of vinyl ester, vinyl ester/ethylene vinyl chloride, (meth)acrylate, styrene/acrylate homopolymers or copolymers; b) 0 to 35 percent by weight in relation to the overall mass of the polymer, of at least one spray adjuvant; c) 0.001 to 3 percent by weight, in relation to the overall mass of the polymer, of at least one water-soluble or water-insoluble optical brightener and d) 0 to 25 percent by weight, in relation to the overall mass of the polymer, of at least one anticaking agent. The invention also relates to a method for the production of said dispersion powder and to the utilization thereof.

Abstract: A dispersion powder composition based on water-insoluble polymers with particularly low water absorption comprises, based on the total weight of the polymer, an amount in the range from 0.1 to 30% by weight of at least one carboxylic ester whose acid component has at least 6 carbon atoms and whose alcohol component is a polyhydroxy compound, preferably glycerol, diglycerol, or triglycerol. This is prepared by mixing polymer and protective colloid with the carboxylic ester to prepare a dispersion and then, where appropriate, drying this with simultaneous admixing of an anticaking agent, and gives good results when used for modifying wallpaper pastes, mortars, or concrete.

Abstract: The present invention relates to a water-dispersible dispersion powder composition based on water-insoluble polymers, and comprising, based on the total weight of the polymer, from 0.1 to 30% by weight of at least one carboxylic ester whose alcohol component derives from the group consisting of the polyhydroxy compounds, and to a process for preparing the composition, and also to the use of the composition, in particular for reducing the water absorption of construction compositions.

Abstract: The invention relates to the use of a powder composition which comprises at least one carboxylic ester, for hydrophobicizing construction compositions.

Abstract: The present invention relates to dispersion powders comprising a) at least one base polymer from the group consisting of the vinyl ester, vinyl ester comonomer, vinyl ester/ethylene, (meth)acrylate and styrene/acrylate polymers, b) from 1 to 25% by weight, based on the base polymer, of at least one protective colloid, c) from 1 to 25% by weight, based on the base polymer, of at least one partially acetalized, water-soluble polyvinyl alcohol, d) from 0 to 20% by weight, based on the total polymer weight, of anticaking agent and e) if required, further additives, the use of these, and process for their preparation.

Abstract: Dispersion powders including (a) a polymer of vinyl ester, vinyl ester/ethylene, (meth)acrylate or styrene/acrylate homo- and copolymers, (b) 1 to 25% by weight, based on the total weight of the polymer, of a protective colloid, (c) 0.1 to 10% by weight, based on the total weight of the polymer, of at least one saturated carboxylic acid ester of the formula C.sub.n H.sub.(2n+1) COOC.sub.m H.sub.(2m+1) where n=5 to 22 and m=1 to 8, and (d) 0 to 20% by weight, based on the total weight of the polymer, of anticaking agent, are useful, for example, as modifying agents in mortar and concrete for increasing the flexural tensile strength, compressive strength, and/or adhesive strength thereof.

Abstract: A copolymer in dispersion or redispersible powder form which is stabilized by a protective colloid and has a glass transition temperature of -40.degree. to 10.degree. C. and an ethylene content of at least 30% by weight, based on the total amount of monomers, with a heterogeneous build-up of the copolymer particles, including a first polymer phase, which includes vinyl acetate and >40% by weight of ethylene, based on the total amount of monomers in this phase, and a last copolymer phase, which includes vinyl acetate and 5 to 40% by weight of ethylene, based on the total amount of monomers in this phase, is suitable, for example, as a binder in building materials.