Patent EP-2003940-A2 (EP)
Inventor: WALTHER THOMAS
IPC: H05K3/10
Filed: 2008-06-02
Abstract: The method for the production of a topographically produced functional layer on a substrate (1) by a structured pre-printed form of an adhesive in a printing element or a printing device, comprises producing functions e.g. electrical conductivity by dusting the adhesive layer with powdery functional particles, hardening or drying the adhesive, removing surplus functional particles, which are not adhered to a structured adhesive adhesive-track, through a device, and electrically neutralizing the removed particles by discharging device e.g. an alternating voltage corona. The method for the production of a topographically produced functional layer on a substrate (1) by a structured pre-printed form of an adhesive in a printing element or a printing device, comprises producing functions e.g. electrical conductivity by dusting the adhesive layer with powdery functional particles, hardening or drying the adhesive, removing surplus functional particles, which are not adhered to a structured adhesive adhesive-track, through a device, and electrically neutralizing the removed particles by discharging device e.g. an alternating voltage corona. The functional particles are adhered at the adhesive-track or integrated into the adhesive-track and are heated through thermal effect in such a manner that a component of the added particles is melted. The topographical structured layer is a component of a multilayer-arrangement, which comprises a second printed or coated functional layer below the first layer. The functionalities of the layers are produced by two different materials or the printed and/or coated layers in such a manner that the layers differentiate with respect to the degree of functionality or are arranged on the substrate. The structured adhesive track, which is dusted with functional particles, is applied by offset, deep, flexo-graphic, filter or ink-jet printing process. The dusting procedure takes place in an electrical field, where the functional particles are charged with a defined charge and accelerated in the direction of a counter electrode (5). The charging of the functional particles takes place via tribo-electric charge, via contact charge or via a corona charge. The substrate is provided with a charge by a direct current (DC) voltage corona plant before applying the particles and the polarity of the counter electrode is opposite to the polarity of the charged functional particles. The counter electrode is arranged below the substrate, where the counter electrode is formed as plate, as electrostatically charged conveyor or as cylinder or in other suitable form or the counter electrode is formed by adhesive-track. The adhesive has electrical conductivity and is grounded by contacts or subjected with a potential, where its polarity is opposite to the polarity of the charged functional particles. The functional particles: are metallic particles or semiconductors; are formed from conducting or semiconducting polymers from conductive polymers and their derivatives and mixtures, photo-catalytically active materials, carbon black, nanotubes, graphite, glass or its mixture; consist of electrically isolating polymers that serves for the formation of an isolation layer; have electrolytic characteristics; are micro polymer spheres that contain functional material in a firm, liquid or gaseous condition; contain light emitting material, where the particles contain a coloring material; are photoactive particles for the transformation of radiation energy into electrical energy, where the particles are organic, inorganic or hybrid inorganic/organic type; have catalytic characteristics, where enzymes are used; are biomarker, which has a reaction in interaction with a biological material, where the particles consist of or contain biomarkers and are usable as biomarker materials, which indicate the sugar content in the blood on the basis to a different coloring; and are hydrophobic particles for the structuring of surfaces, e.g. polytetrafluoroethylene or silicone. The semiconducting metallic particles are coated at the surface, which is provided with a semiconducting or conducting polymer and the metalloids are formed in amorphous or crystalline form and/or in imaginable intermediate form and are formed from the metallic oxides.