Basf Se Corporation

Julien Courtois

Klaus Hahn

Norbert Wagner

Axel Wilms

Michael Siemer

Frank Hermanutz

Volker Rauschenberger

Stefan Schwiegk

Ingo Bellin

Alexander Traut

Dirk Gerhard

Carsten Schips

Mohammed Abboud

Giovanni D'Andola

Christoffer Kieburg

Frank Gaehr

Willi Riegel

Ronald Frans Maria Lange

Petra Lutz-Kahler

Joshi Ketan

The invention relates to a method for producing hollow bodies having freely displaceable particles enclosed in the hollow body, wherein a) a gel-forming liquid in which the particles are suspended is brought into a cross-linking bath, b) the gel cores that form are isolated, c) the cores are coated with a composition comprising sinterable material and a binder, and d) the coated cores are subjected to a heat treatment wherein the gel and the binder are expunged and the sinterable material is sintered into a closed shell. The gel forming material is, for example, sodium alginate, and the cross-linking bath comprises calcium ions. The particles are selected, for example, from ZrO, AlO, TiO, and SiOor mixtures thereof. The sinterable material is, for example, a metal powder such as carbonyl iron powder.

Method for producing hollow bodies having enclosed freely displaceable particles

A process for producing porous structures from polyamide by dissolving the polyamide in an ionic liquid and precipitating or coagulating the dissolved polyamide by contacting the solution with a liquid precipitant medium. Fibers are produced from the dissolved polyamide in a wet-spinning process by precipitation in protic solvents, in particular water, a C1-4-alkanol or mixtures thereof, and subsequent freeze-drying. Foils, films or coatings are produced by blade coating the dissolved polyamide onto a substrate surface, optionally spraying with protic solvent, in particular water, a C1-4-alcohol or mixtures thereof, dipping into a precipitation or coagulation bath, freeze-drying of the resulting foil, of the film or of the coated substrate. Molded parts are prepared by extracting the dissolved polyamide with protic solvents, preferably water, a C1-4-alcohol or mixtures thereof, wherein the dissolved polymer is transformed to a solid or wax-like state by cooling and extracted after subsequent molding.

Method for producing porous structures from synthetic polymers

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Ludwigshafen, Germany

Julien Courtois