Abstract:
The present invention provides the use of aqueous polymer dispersions comprising (a) at least two monomers M1 having a glass transition temperature≧25° C., (b) at least two monomers M2 having a glass transition temperature
Abstract:
The present invention relates to an aqueous emulsion paint comprising a) 5% to 50% by weight of an aqueous polymer dispersion having a solids content in the range from 40% to 60% by weight, obtainable by the free-radical aqueous emulsion polymerization of a monomer mixture comprising ethylhexyl acrylate, butyl acrylate and one or more vinylaromatics, preferably styrene, b) 0.1% to 5% by weight of alkali metal alkylsiliconate and/or water-soluble silicate, c) 20% to 70% by weight of inorganic fillers, d) 0% to 30% by weight of at least one pigment, e) 0.1% to 10% by weight of customary auxiliaries, and f) water, based in each case on the total amount of the emulsion paint, the pH of the emulsion paint having a value in the range from 10 to 12, and also relates to the aqueous polymer dispersions, to a process for the preparation thereof and to the use thereof as organic binders in emulsion paints having a high pH.
Abstract:
The present invention relates to the use of aqueous polymer dispersions of a polymer P obtainable by emulsion polymerization of ethylenically unsaturated monomers M in the presence of at least one anionic emulsifier as binders in a waterborne coating formulation having a pH of at least pH 9.5. The polymer dispersion is an aqueous polymer dispersion of a polymer P obtainable by emulsion polymerization of ethylenically unsaturated monomers M in the presence of at least one anionic emulsifier, where the monomers M comprise or consist of the following monomers M1, M2 and optionally M3 and/or M4 a) 90 to 99.9% by weight, based on the total weight of monomers M, of monomers M1 selected from the group consisting of C1-C20 alkylesters of acrylic acid, C1-C20 alkylesters of methacrylic acid, C5-C20 cycloalkylesters of acrylic acid, C5-C20 cycloalkylesters of methacrylic acid, and monovinylaromatic monomers, where the relative amount of monovinylaromatic monomers does not exceed 15% by weight, based on the total weight of monomers M; b) 0.1 to 5% by weight, based on the total weight of monomers M, of monomers M2 selected from monoethylenically unsaturated monomers bearing at least one carboxyl group; c) 0 to 2% by weight, based on the total weight of monomers M, of one or more monoethylenically unsaturated monomers M3 bearing at least one sulfate or sulfate group; and d) 0 to 5% by weight or less than 0.5% by weight, based on the total weight of monomers M, of one or more ethylenically unsaturated non-ionic monomers M4 different from the monomers M1, M2 and M3; 25 whereby the emulsion polymerization is carried out in the presence of a base in such an amount sufficient to neutralize more than 20 mol-%, in particular at least or more than 25 mol-% and especially at least 30 mol-% of the carboxyl groups of all monomers M2.
Abstract:
The present invention relates to aqueous polymer latexes of film-forming copolymer particles obtainable by aqueous emulsion polymerisation of monoethylenically monomers M, which mainly comprise non-ionic monomers of the group consisting of alkyl(meth)acrylates, cycloalkyl(meth)acrylates and monovinylaromatic hydrocarbon monomers and which additionally comprise 0.01 to 1% by weight, based on the total weight of monomers M, of at least one monoethylenically unsaturated monomer M2 having a hydrolysable silane group; and 0.1 to 2% by weight, based on the total weight of monomers M, of at least one monoethylenically unsaturated monomer M3 having an acidic phosphate group, or a salt thereof and where the copolymer particles in the polymer latex have volume median particle diameter of at least 250 nm, as determined by dynamic light scattering according to the ISO 13321:1996 standard. The polymer latexes are particularly suitable as binders in coating compositions having high pigment volume concentration (PVC) of preferably above 60% and provide good wet scrub resistance and opacity to coatings obtained therefrom. The present invention also relates to a process for producing such polymer latexes, to waterborne coating compositions containing these latexes and to the use of said polymer latexes for improving the wet scrub resistance and the opacity of coating compositions having a pigment volume concentration (PVC) of preferably above 60%.
Abstract:
The present invention relates to aqueous binder compositions comprising an aqueous polymer latex of a film forming carboxylated polymer and a branched polyetheramine polyol dissolved in the aqueous phase of the aqueous polymer latex, wherein essentially all of the amino groups in the branched polyetheramine polyol are tertiary amine groups. The present invention also relates to water-borne coating compositions containing such an aqueous binder composition.