Abstract: The present invention relates to a filler for a paint composition, wherein the filler comprises a calcinate having particles with an average particle size (d50, SediGraph III) in the range between 3 ?m and 50 ?m and a mullite content of 30-70 measured as mullite index. The invention is characterised in that the bulk density of the filler is >450 g/L. The invention also relates to a paint composition characterised in that it comprises a filler which has a bulk density>450 g/L and comprises a calcinate which has particles with a mean particle size (d50, SediGraph III) in the range between 3 ?m and 50 ?m and a mullite content of 30-70 measured as mullite index. Furthermore, the invention relates to uses of such a filler for the preparation of a paint composition.

Abstract: The invention is directed to composite material comprising a base material comprising at least one first binder and at least one particulate first filler fraction based on inorganic or organic, natural or synthetic material, and a coating layer which at least partially covers the base material, wherein the coating layer comprises at least one second binder and at least one particulate second filler fraction of a particularized mean size, wherein the second filler fraction comprises particles having a particularized mineral hardness, wherein the second filler fraction comprises particles selected from a group comprising a wide variety of materials and/or mixtures thereof. The invention further relates to a method for producing a composite material and a construction element comprising such a composite material.

Abstract: The invention relates to a method for producing solid particles from an inorganic solid containing at least one alkali metal and/or alkaline earth metal, comprising at least the following steps: a) providing the inorganic solid containing at least one alkali metal and/or alkaline earth metal; b) extracting the at least one alkali metal and/or alkaline earth metal from the inorganic solid containing alkali metal and/or alkaline earth metal to obtain an extract containing the alkali metal and/or alkaline earth metal and an alkali metal-depleted and/or alkaline earth metal-depleted residue; c) separating the extract from the residue; d) processing the residue to obtain the solid particles, wherein at least one of the processing steps is selected from a group comprising transporting, filling, packaging, washing, drying, adjusting the pH value, separating according to a mean grain size and/or mass and/or density, adjusting a mean grain size, magnetic separating, calcining, thermal rounding and surface coating.

Abstract: The invention relates to composite particles, comprising a carrier particle and an at least partial surface coating, the carrier particle comprising a quartz and a layered silicate and the surface of the composite particle having at least one hydrophilic region and at least one hydrophobic region. The invention also relates to a method for producing composite particles, comprising the steps: a) providing carrier particles, comprising a quartz and a layered silicate, b) introducing the carrier particles into a mixing device, c) charging the carrier particles with a coating composition, d) coating the carrier particles with the coating composition by mixing the carrier particles with the coating composition, with the introduction of shear energy, e) subjecting the coated carrier particles to temperature. In addition, the invention relates to a mineral cast part or to a composite workpiece which comprises the above-described composite particles.

Abstract: The present invention relates to a filler for a paint composition, wherein the filler comprises a calcinate having particles with an average particle size (d50, SediGraph III) in the range between 3 ?m and 50 ?m and a mullite content of 30-70 measured as mullite index. The invention is characterised in that the bulk density of the filler is >450 g/L. The invention also relates to a paint composition characterised in that it comprises a filler which has a bulk density >450 g/L and comprises a calcinate which has particles with a mean particle size (d50, SediGraph III) in the range between 3 ?m and 50 ?m and a mullite content of 30-70 measured as mullite index. Furthermore, the invention relates to uses of such a filler for the preparation of a paint composition.

Abstract: The present invention relates to a filler, in particular a powdery filler, for a coating composition, in particular for a paint, a lacquer or an impregnating agent. The invention is characterised in that the filler comprises particles which have a surface coating, the particles comprising a siliceous or carbonatic component and having a basic pH value in aqueous solution, and the surface coating of the particles comprising one of the substances alkyltrimethoxysilane, alkyltriethoxysilane and/or alkyl siloxane. The invention furthermore relates to a coating composition containing a filler of this kind. In addition, the invention relates to uses of a filler of this kind for treating stones, ceramics or construction materials against moisture penetration, corrosion and algae, mold and/or plant growth.

Abstract: The invention relates to composite particles, comprising a carrier particle and an at least partial surface coating, the carrier particle comprising a quartz and a layered silicate and the surface of the composite particle having at least one hydrophilic region and at least one hydrophobic region. The invention also relates to a method for producing composite particles, comprising the steps: a) providing carrier particles, comprising a quartz and a layered silicate, b) introducing the carrier particles into a mixing device, c) charging the carrier particles with a coating composition, d) coating the carrier particles with the coating composition by mixing the carrier particles with the coating composition, with the introduction of shear energy, e) subjecting the coated carrier particles to temperature. In addition, the invention relates to a mineral cast part or to a composite workpiece which comprises the above-described composite particles.

Abstract: The invention relates to a method for producing a coloured sand composition containing a large number of silica sand grains with outer coatings of colour pigments, wherein the method comprises the following steps: mixing caustic soda and water in a predetermined ratio, preferably of 1:2, to form a dilute caustic soda; mixing boric acid in a predetermined concentration with the dilute caustic soda to form a boric acid/caustic soda solution; mixing a binder with the boric acid/caustic soda solution in a predetermined ratio to form a coating mixture; coating the silica sand grains coated with the colour pigments with the coating mixture by adding the coating mixture to the silica sand grains, and indirectly heating the silica sand grains coated with the coating mixture in a system which is spatially sealed from the heating source by means of separate chambers for the heating process and the heating source. A coloured sand composition is also described.