Basf Aktiengesellschaft

Basf Magnetics Gmbh

Emtec Magnetics Gmbh

Lothar Schwarz

Jenoe Kovacs

Hermann Roller

Oskar Stephan

Franz Weingart

Heino Thiele

Norbert Muller

Uwe Burkhardt

Peter Nagel

Peter Engelhardt

Jochen Eicher

Guenther Kuntz

Continuous recovery of raw materials from coated films and apparatus for this purpose and film material recovered therewith. Large amounts of coated films can be fed to a continuous recycling process in which any pigments present in the coating and the substrate material are recovered. The treatment is carried out at room temperature in an alkaline medium consisting of soft soap, organic solvent and/or water, with or without the use of a catalyst. The solvent is recycled. After the first treatment stage, the film shreds can be treated in a second stage with a solvent/water mixture similarly to the first stage, and thorough final washing in a water or solvent circulation is effected in a third stage. The recovered film shreds are dried, pressed, milled and brought to the desired shape in a plastics agglomerator, and the recovered pigments are dried under reduced pressure (FIG.,). The process and apparatus can be used with advantage for any type of substrate or printed media, for example for magnetic substrates, photographic substrates, printing plates, pigment-free substrates.

Continuous process for recovering raw materials from coated foils, device for carrying out this process and foil materials recovered thereby

A filter apparatus is described, in which there are in the interior of a filter housing (7) a multiplicity of filter elements (1) which are suspended on the filter cover (3) and in which the inner bores of the filter cartridges are connected to the outlet nozzle (6) via a system of channels. Against the wall of the filter housing (7) there bears a film bag (2), the upper end of which is welded to an O-ring (4), which is seated in an annular groove on the flange of the filter housing, with the diameters of O-ring and film bag being identical. Furthermore, volume displacers (16, 17, 25), which extend in the axial direction over the entire length of the filter housing, are provided between filter bag (2) and inner wall of the filter housing as well as in the inner space of the filter cartridges. When a filter is changed, these volume displacers are, for example, inflated with compressed air, as a result of which the volume of residual filtrate is considerably reduced, so that less loss of dispersion occurs. The arrangement described permits an easy filter change and offers advantages in the disposal of the residues (2).

Filter apparatus including filter cartridges and an inpermeable film bag

Magnetic recording media are produced by dispersing pulverulent magnetic material in a mixture of a solvent, an organic polymer binder, a dispersant and other conventional additives, with the aid of a conventional dispersing apparatus and using a particular ceramic grinding medium, applying the resulting dispersion in the form of a layer on a base and then compacting the layer.

Production of magnetic recording media

Growing community of inventors

Oberkirch, Germany

Lothar Schwarz