Abstract: The invention discloses dispersions of preferably modified strontium carbonate in organic liquids, for example in alcohols, ketones or particularly methylene chloride. The dispersions are usable for the preparation of polymers which have reduced birefringence or no birefringence and are therefore suitable for optical applications. The powder obtainable after the removal of the organic liquid can surprisingly be converted back to a dispersion with little energy.

Abstract: The invention discloses a method of incorporating deagglomerated barium sulphate having an average primary particle size of less than 0.5 ?m and coated with a dispersant into plastics or precursors of plastics, for example into polyols. The deagglomerated barium sulphate is dispersed in an organic solvent, the dispersion is incorporated into the plastic or the precursor of the plastic, and the solvent is evaporated off.

Abstract: The invention discloses deagglomerated barium sulphate which has an average primary particle size of less than 0.5 ?m and is coated with a dispersant. The dispersant has preferably reactive groups which are able to interact with the surface of the barium sulphate; particularly preferred dispersants are those which are able to endow the barium sulphate with a hydrophilic surface and have reactive groups for coupling to or into polymers. Also disclosed is a plastics premix comprising the deagglomerated, coated barium sulphate.

Abstract: Epoxy resins comprising deagglomerated barium sulphate with an average particle size of less than 0.5 ?M feature increased flexural impact strength and breaking extension. Epoxy resins of this kind can be used as, for example, composite material or binders in watercraft construction, in wind turbines, in pipes, for containers or in aircraft construction, in particular in composite materials comprising glass fibre or carbon fibre.

Abstract: The invention discloses polymeric esters of terephthalic acid with deagglomerated barium sulphate having an average primary particle size of less than 0.5 ?m, containing a crystallization inhibitor and being coated with a dispersant, as filler. The dispersant has preferably reactive groups which are able to interact with the surface of the barium sulphate; particular preference is given to dispersants which are able to endow the barium sulphate with a hydrophilic surface and have reactive groups for coupling to or into polymers. Also disclosed is a corresponding precursor based on macrocyclic oligoesters which comprise such barium sulphate.

Abstract: The invention discloses a dispersion of deagglomerated barium sulphate having an average primary particle size of <0.5 ?m and coated with a dispersant in defined organic solvents, especially halogenated solvents such as dichloromethane. The dispersant preferably has reactive groups which are able to interact with the surface of the barium sulphate; particularly preferred dispersants are those which are able to endow the barium sulphate with a hydrophilic surface and which have reactive groups for coupling to or into polymers. The dispersion lends itself very well to incorporation into polymers such as acrylates, methacrylates, or particularly into hydrophobic polymers such as polycarbonate, or precursors thereof.

Abstract: Particles, especially nanoparticles, being coated with copolymers (A) of olefinically unsaturated monomers (a), preparable by single-stage or multistage controlled free-radical copolymerization in an aqueous medium of (a1) at least one olefinically unsaturated monomer containing at least one chelate-forming group and (a2) at least one olefinically unsaturated monomer different from olefinically unsaturated monomer (a1) and selected from the group consisting of (a21) monomers of the general formula (I): R1R2C?CR3R4, in which the radicals R1, R2, R3, and R4 each independently are hydrogen atoms or substituted or unsubstituted alkyl, cycloalkyl, alkylcycloalkyl, cycloalkylalkyl, aryl, alkylaryl, cycloalkylaryl, arylalkyl or arylcycloalkyl radicals, with the proviso that at least two of the variables R1, R2, R3 and R4 are substituted or unsubstituted aryl, arylalkyl or arylcycloalkyl radicals, especially substituted or unsubstituted aryl radicals, (a22) olefinically unsaturated terpene hydrocarbons, and (a23)

Abstract: The present invention relates to the use of nanoparticles for the preparation of water-based dispersion adhesives, and especially the use of finely divided barium sulfate therein. The nanoparticles can be used with or without chemical modification. Adhesives of this kind feature improved properties, examples being improved cohesion in conjunction with comparable adhesion and higher heat resistance. Preference is given to dispersion adhesives based on polyacrylate, polyurethane, and epoxy resin.

Abstract: The invention discloses a method of incorporating deagglomerated barium sulphate having an average primary particle size of less than 0.5 ?m and coated with a dispersant into plastics or precursors of plastics, for example into polyols. The deagglomerated barium sulphate is dispersed in an organic solvent, the dispersion is incorporated into the plastic or the precursor of the plastic, and the solvent is evaporated off.

Abstract: The invention discloses dispersions of preferably modified strontium carbonate in organic liquids, for example in alcohols, ketones or particularly methylene chloride. The dispersions are usable for the preparation of polymers which have reduced birefringence or no birefringence and are therefore suitable for optical applications. The powder obtainable after the removal of the organic liquid can surprisingly be converted back to a dispersion with little energy.

Abstract: Epoxy resins comprising deagglomerated barium sulphate with an average particle size of less than 0.5 ?m feature increased flexural impact strength and breaking extension. Epoxy resins of this kind can be used as, for example, composite material or binders in watercraft construction, in wind turbines, in pipes, for containers or in aircraft construction, in particular in composite materials comprising glass fibre or carbon fibre.

Abstract: The invention discloses deagglomerated barium sulphate which has an average primary particle size of less than 0.5 ?m and is coated with a dispersant. The dispersant has preferably reactive groups which are able to interact with the surface of the barium sulphate; particularly preferred dispersants are those which are able to endow the barium sulphate with a hydrophilic surface and have reactive groups for coupling to or into polymers. Also disclosed is a plastics premix comprising the deagglomerated, coated barium sulphate.