The patent's inventors are Giselbrecht, Stefan (Karlsruhe, DE); Truckenmuller, Roman (Flein, DE); Trautmann, Christina (Darmstadt, DE).
This patent was filed on
From the background information supplied by the inventors, news correspondents obtained the following quote: "The invention relates to a molded body into which at least one hollow structure is configured, wherein the film and the at least one hollow structure contain a plurality of pores. The invention furthermore relates to a method for producing the molded body and the use thereof.
"Commonly used methods for producing micro-perforated films (membranes) are based either on directed physical processes such as the ion-trace technology, the laser micro-perforation, or the lithography, on special precipitation methods such as the phase inversion, or on drawing processes. Whereas the latter two processes are primarily used for producing flat micro-filtration and ultra-filtration membranes, the directed physical processes are generally used for the micro-perforation of micro-structures. In combination with technical micro-structuring processes, such as the micro injection-molding or the hot stamping, however, these processes can be used only with already existing three-dimensional microstructures.
"To be sure, perforating all sides of a microstructure of this type by turning and rotating the structure is conceivable in principle, for example when subjecting it to radiation, but can be realized only at high expense and only with individual, free-standing structures. In the case of several adjacent structures (structure array), at most a micro-perforation that is perpendicular or at a slight angle to the structural plane is possible."
Supplementing the background information on this patent, NewsRx reporters also obtained the inventors' summary information for this patent: "Starting from this point, it is the object of the present invention to propose a molded body, a method for producing said body and the use thereof, which do not have the aforementioned disadvantages and limitations. In particular, it is the object to provide a molded body with three-dimensional, thin-walled hollow structures of polymer that are perforated on all sides and have a defined pore size between 10 nm and 10 .mu.m.
"A molded body according to the invention consists of a film (membrane) having a film thickness D ranging from 1 .mu.m to 1000 .mu.m, preferably from 10 .mu.m to 100 .mu.m, wherein the film thickness advantageously remains nearly constant over large areas (several square meters). The film itself advantageously consists of a thermoplastic plastic material, preferably polymethylmethacrylate (PMMA), polycarbonate (PC), polyethyleneterephthalate (PET), polystyrene (PS), polyimide (PI), polypropylene (PP), polyvinylidenfluoride (PVDF), or cycloolefin copolymer (COC).
"At least one hollow structure (cavity) is configured into the film, wherein the geometric dimensions of said structure are expressed with the following values: The outside diameter d of the hollow structure has a value that is at least double the value of the film thickness D: d.gtoreq.2*D (1) and especially preferred is at least three times the value of the film thickness D. The height h (depending on the view, it may be the depth) of the hollow structure is at most double the value of the outside diameter d: h:d.ltoreq.2:1 (2) The wall strength (wall thickness) b of the hollow structure is approximately the same or is lower by one order of magnitude than the film thickness D, meaning it assumes a value between 0.02 times the film thickness D and the film thickness D: 0.02*D.ltoreq.b.ltoreq.D (3) The value for the local curvature radius r of the hollow structure is on the order of magnitude of the respective local wall thickness b, meaning it has a value between 0.2 times and 5 times the wall thickness b: 0.2*b.ltoreq.r.ltoreq.5*b (4)
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