Rhodia Ag

Bruno Kliemann

Dieter Imbery

Ernst Heim

Martin Stoll

A method for the production of electret filaments or fibers from high molecular weight substances is described which consists of melting the substances and extruding them through die orifices, electrically charging, polarizing and cooling the formed filaments or fibers and the electrically charging and polarization is carried out immediately prior to the issuance or during the issuance from the die orifices while the substances are in a molten state. The device for electric charging and polarizing consists either of an electrode (2) provided with one point or several points (1) which except for the point or points (1) is coated with or surrounded by an electrically insulating material, one point (1) inside the die (3) being disposed directly in front or protruding into a die orifice (4) or of an electrode (9) provided with one point or several points (8) completely coated with or surrounded by an electrically insulating material, one point (8) inside the die (3) being disposed directly in front or protruding into a die orifice (4), and of a counterelectrode (10) which is not coated with or surrounded by an electrically insulating material and which is inside the die (3) but not disposed directly in front of or protruding into the die orifices (4).

Process and apparatus for the preparation of electret filaments, textile

An additive for smoking tobacco products and their filter elements is described which comprises an intimate mixture of at least two highly dispersed metal oxides or metal oxyhydrates, mixtures thereof or a mixture of different forms of the same metal oxide or metal oxyhydrate, the mixture exhibiting liquid-like properties anomalous for a mixture of solids, and specific properties of the mixture, such as the bulk density, the surface area, the flowability and the absorption capacity for gases and vapors not representing an additive value of the proportions of the mixing components, and the absorption capacity for toxic substances in the tobacco smoke being synergistically increased.

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Freiburg im Breisgau, Germany

Bruno Kliemann