Abstract: A screen-printing paste as a starting material for fabricating a gas diffusion electrode through screen-printing includes at least one polymer, at least one metallic catalyst, and a high-boiling solvent. The polymer is a binder including poly(butyl acrylate)-polymethacrylate copolymer, a poly(vinyl alcohol), and a poly(ethylene oxide). The polymer can be two polymers, a first being used for hydrophobicization and present in an amount of between 0 to 10% by weight based on a content of the metallic-catalyst, and a second being a binder. A screen-printing method of fabricating the electrode for a fuel cell includes forming a screen-printing layer having a thickness between 3 and 40 &mgr;m by applying the screen-printing paste to a base. The solvent and the polymer serve as a screen-printing medium. The screen-printing layer is baked to allow only residues of the solvent and the polymer to remain, which do not interfere with using the electrode in a fuel cell.

Abstract: A gas diffusion electrode for a PEM fuel cell includes a metallic catalyst, and an electrocatalyst layer having a polymer A for hydrophobicizing the electrocatalyst layer and a uniform thickness of between 3 to 40 &mgr;m. The polymer A content is less than 10% by weight based on the metallic catalyst content. A method of producing a gas diffusion electrode for a PEM fuel cell and a method of hydrophobicizing a gas diffusion electrode include screen printing a paste onto a carrier and removing the screen-printing medium by heating. The paste includes at least one metallic catalyst with a content of polymer A up to at most 10% by weight, and a screen-printing medium. The electrocatalyst layer of the electrode has a significantly lower content of the catalyst inhibitor TEFLON® because it is not added only to the screen-printing paste but is subsequently applied, with the same surface-specific effect, by dipping the finished electrocatalyst layer in a solution containing TEFLON®.

Abstract: In a method for manufacturing a working electrode for an implantable, electrochemical oxygen sensor a thin layer of a uniform mixture composed of an epoxy-based resin, a hardener and powdered vitreous carbon is applied onto a ring or hollow cylinder of biocompatible, inert, electrically conductive material, and the resin is hardened.

Abstract: In a process for producing a prepolymer epoxy resin mixture with oxazolidinone structures, an insoluble reaction resin powder which has no isocyanate groups and consists of an epoxy resin mixture containing a reaction accelerator and filler and having isocyanurate structures, is fed to a continuously working reactor and reacted at temperatures up to 200.degree. C., with reactor temperature at 140.degree.-190.degree. C., and then the extruded material is cooled down to a temperature of <50.degree. C. with the aid of a cooling device mounted at the outlet die of the reactor.

Abstract: Siliconimides, which contain cross-linkable, functional groups, having the general formula ##STR1## in which the Q residues contain the functional groups.