Abstract: The present invention relates to the use of closed-pore microspheres of expanded perlite as a filler for producing moldings for the foundry industry, to a composition for producing moldings for the foundry industry, comprising closed-pore microspheres of expanded perlite as a filler, and a binder, the binder being selected from the group consisting of water glass, phenol-formaldehyde resins, two-component systems comprising as reactants a polyisocyanate and a polyol component containing free hydroxyl groups (OH groups), and starch, and also to moldings for the foundry industry and to a process for producing a molding for the foundry industry.

Abstract: The present invention relates to the use of closed-pore microspheres of expanded perlite as a filler for producing moldings for the foundry industry, to a composition for producing moldings for the foundry industry, comprising closed-pore microspheres of expanded perlite as a filler, and a binder, the binder being selected from the group consisting of water glass, phenol-formaldehyde resins, two-component systems comprising as reactants a polyisocyanate and a polyol component containing free hydroxyl groups (OH groups), and starch, and also to moldings for the foundry industry and to a process for producing a molding for the foundry industry.

Abstract: The present invention relates to the use of closed-pore microspheres of expanded perlite as a filler for producing moldings for the foundry industry, to a composition for producing moldings for the foundry industry, comprising closed-pore microspheres of expanded perlite as a filler, and a binder, the binder being selected from the group consisting of water glass, phenol-formaldehyde resins, two-component systems comprising as reactants a polyisocyanate and a polyol component containing free hydroxyl groups (OH groups), and starch, and also to moldings for the foundry industry and to a process for producing a molding for the foundry industry.

Abstract: An insulating product for the refractory industry or an insulating material as intermediate for production of such a product, and a corresponding insulating material/insulating product are provided. Likewise the use of a matrix encapsulation process in the production of an insulating product for the refractory industry and a corresponding insulating product and/or an insulating material as intermediate for production of such a product are provided.

Abstract: What are described are a process for producing an insulating product for the refractory industry or an insulating material as intermediate for production of such a product, and a corresponding insulating material/insulating product. Likewise described are the use of a matrix encapsulation process in the production of an insulating product for the refractory industry and a corresponding insulating product and/or an insulating material as intermediate for production of such a product.

Abstract: A process (i) for producing a metal casting or (ii) for producing a cured shaped part for use in the casting of metallic castings is described. Furthermore, the use of an aliphatic polymer which comprises structural units containing hydroxy groups and has been crosslinked by etherification as binder of a shaped part for use in the casting of metallic castings is described. A shaped part for use in the casting of metallic castings, comprising at least one base mould material and a cured binder comprising or consisting of an aliphatic polymer which comprises structural units containing hydroxy groups and has been crosslinked by etherification, is likewise described. In addition, a cured shaped part which is producible by a process according to the invention and also a mould material mixture for use in the process of the invention are described.

Abstract: A process (i) for producing a metal casting or (ii) for producing a cured shaped part for use in the casting of metallic castings is described. Furthermore, the use of an aliphatic polymer which comprises structural units containing hydroxy groups and has been crosslinked by etherification as binder of a shaped part for use in the casting of metallic castings is described. A shaped part for use in the casting of metallic castings, comprising at least one base mould material and a cured binder comprising or consisting of an aliphatic polymer which comprises structural units containing hydroxy groups and has been crosslinked by etherification, is likewise described. In addition, a cured shaped part which is producible by a process according to the invention and also a mould material mixture for use in the process of the invention are described.

Abstract: A method for producing a feeder element is described. The method includes (a) producing composite particles having a particle size of less than 2 mm in a matrix encapsulation method with the following steps: (a1) producing droplets of a suspension from at least (i) one or more refractory substances, (ii) one or more of fillers having a bulk density in the range from 10 to 350 g/L, expandants, and pyrolysable fillers, (iii) as continuous phase, a solidifiable liquid, (a2) solidifying the droplets with the refractory substance(s) and density-reducing substance(s) are encapsulated therein, (a3) treating the hardened droplets to form composite particles, (b) mixing the composite particles with a binder and, optionally, further constituents to give a feeder composition, (c) shaping and curing the feeder composition to give a feeder element. Also described are a method for producing refractory composite particles and the use of the composite particles.

Abstract: The invention relates to core-shell particles for use as a filler for feeder compositions for producing feeders, comprising (a) a core which possesses one or more cavities and a wall surrounding these cavities, where the core (a) has an average diameter in the range from 0.15 to 0.45 mm, (b) a shell enclosing the core and consisting of or comprising (b1) particles comprising or consisting of a material from the group consisting of calcined kaolin or cordierite, where the particles (b1) have a d10 of at least 0.05 ?m and a d90 of at most 45 ?m, and also (b2) a binder which binds the particles (b1) to one another and to the core (a).

Abstract: What are described are a process for producing an insulating product for the refractory industry or an insulating material as intermediate for production of such a product, and a corresponding insulating material/insulating product. Likewise described are the use of a matrix encapsulation process in the production of an insulating product for the refractory industry and a corresponding insulating product and/or an insulating material as intermediate for production of such a product.

Abstract: The invention relates to core-shell particles for use as a filler for feeder compositions for producing feeders, comprising (a) a core which possesses one or more cavities and a wall surrounding these cavities, where the core (a) has an average diameter in the range from 0.15 to 0.45 mm, (b) a shell enclosing the core and consisting of or comprising (b1) particles comprising or consisting of a material from the group consisting of calcined kaolin or cordierite, where the particles (b1) have a d10 of at least 0.05 ?m and a d90 of at most 45 ?m, and also (b2) a binder which binds the particles (b1) to one another and to the core (a).

Abstract: The present invention relates to the use of closed-pore microspheres of expanded perlite as a filler for producing moldings for the foundry industry, to a composition for producing moldings for the foundry industry, comprising closed-pore microspheres of expanded perlite as a filler, and a binder, the binder being selected from the group consisting of water glass, phenol-formaldehyde resins, two-component systems comprising as reactants a polyisocyanate and a polyol component containing free hydroxyl groups (OH groups), and starch, and also to moldings for the foundry industry and to a process for producing a molding for the foundry industry.

Abstract: A description is given of a use of a composition comprising an ortho-fused phenolic resole in an amount of up to 60 wt %; as first solvent for the ortho-fused phenolic resole, one or more compounds selected from the group consisting of alkyl silicates, alkyl silicate oligomers and mixtures thereof, the total amount of these compounds being greater than 30 wt %; optionally one or more further solvents for the ortho-fused phenolic resole; optionally one or more further additives; the weight percentages being based on the total amount of the composition, as a binder component for producing feeder elements by the cold box process. A description is also given of the use of a two-component binder system for producing feeder elements by the cold box process, and of a method for producing a feeder element for the foundry industry, and also of a feeder element.

Abstract: A method for producing a feeder element is described. The method includes (a) producing composite particles having a particle size of less than 2 mm in a matrix encapsulation method with the following steps: (a1) producing droplets of a suspension from at least (i) one or more refractory substances, (ii) one or more of fillers having a bulk density in the range from 10 to 350 g/L, expandants, and pyrolysable fillers, (iii) as continuous phase, a solidifiable liquid, (a2) solidifying the droplets with the refractory substance(s) and density-reducing substance(s) are encapsulated therein, (a3) treating the hardened droplets to form composite particles, (b) mixing the composite particles with a binder and, optionally, further constituents to give a feeder composition, (c) shaping and curing the feeder composition to give a feeder element. Also described are a method for producing refractory composite particles and the use of the composite particles.

Abstract: The present invention relates to a core-sheath particle for use as filler for feeder compositions for the production of feeders, comprising (a) a carrier core which has a size within a range of from 30 ?m to 500 ?m and consists of a material which is maximally resistant up to a temperature of 1400° C. and does not contain any polystyrene, (b) a sheath which encloses the core and consists of or comprises (b1) particles having a D 50 value for the particle size of at most 15 ?m, which are resistant up to a temperature of at least 1500° C., and (b2) a binder which binds the particles to one another and to the carrier core, the core-sheath particle being resistant up to a temperature of at least 1450° C.

Abstract: The present invention relates to a core-sheath particle for use as a filler for feeder masses for the production of feeders, comprising (a) a carrier core having a size of 30 ?m to 500 ?m and composed of a material, which is resistant up to a maximum temperature of 1400° C. and contains no polystyrene, (b) a sheath surrounding the core composed of or comprising (b1) particles having a maximum D 50 value for grain size of 15 ?m and resistant up to a temperature of at least 1500° C., and (b2) a binding agent binding the particles to one another and to the carrier core, wherein the core-sheath particle is resistant to temperatures up to 1450° C.