Patent application number | Description | Published |
20110290716 | VINYLIDENE FLUORIDE RESIN POROUS FILM AND MANUFACTURING METHOD THEREFOR - A porous membrane of vinylidene fluoride resin, having two major surfaces sandwiching a certain thickness, including a dense layer which governs filtration performance on the one major surface side and a sparse layer which contributes to reinforcement on the other opposite major surface side, and having an asymmetrical gradient network texture including pore sizes which increase continuously from the one major surface to the other opposite major surface, wherein the dense layer includes a 7 μm-thick portion contiguous to the one major surface showing a porosity A | 12-01-2011 |
20120012521 | VINYLIDENE FLUORIDE RESIN HOLLOW FIBER POROUS MEMBRANE AND PROCESS FOR PRODUCING SAME - A hollow-fiber porous membrane of vinylidene fluoride resin, satisfying: a ratio Pmax/Pm of at most 2.0 between a maximum pore size Pmax and an average pore size Pm, and a Pm of 0.13 μm-0.25 μm, according to the half-dry/bubble point method (ASTM F316 and ASTM E1294); a coefficient of variation in outer surface pore size of at most 70%, and a porosity of 75-90%. The hollow-fiber porous membrane has a moderate average pore size, has a pore size distribution which is uniform as a whole and also on the outer surface, and has a high porosity, so that it shows not only a good pure water permeability but also retains a good water permeability even in continuous filtration of cloudy water. The hollow-fiber porous membrane is produced through a process which includes: melt-extruding a vinylidene fluoride resin together with a plasticizer and a good solvent therefor into a hollow-fiber film, cooling and solidifying the film, extracting the plasticizer and good solvent, omitting a heat-treatment for crystallization, and stretching the hollow-fiber after the extraction at a limited temperature range of 80-95° C. which is higher than a conventional stretching temperature. | 01-19-2012 |
20120103895 | VINYLIDENE FLUORIDE RESIN POROUS MEMBRANE, MANUFACTURING METHOD THEREFOR, AND METHOD FOR MANUFACTURING FILTRATE WATER - A porous membrane of vinylidene fluoride resin, including a 10 μm-thick portion contiguous to one surface thereof which comprises network resin fibers having an average diameter of at most 100 nm and shows a porosity A1 of at least 60% as measured by a focused ion beam-scanning electron microscope, and showing a surface pore size of at most 0.3 μm on said one surface thereof. The porous membrane has a treated water side surface layer showing a small surface pore size suitable for water filtration treatment and formed of extremely thin network resin fibers giving an extremely high porosity, thus showing an excellent minute particle-blocking performance and also extremely good anti-soiling resistance and regeneratability. The porous membrane is produced by a process including: melt-extrusion of a composition obtained by adding to vinylidene fluoride resin of a large molecular weight a relatively large amount of a polyester plasticizer which is mutually soluble with the resin and provides the resultant mixture with a crystallization temperature that is substantially identical to that of the vinylidene fluoride resin alone to form film, followed by cooling from one side of the film to solidify the film, extracting the plasticizer and stretching the membrane after the extraction while partially wetting a surface portion thereof. | 05-03-2012 |
20120160764 | POROUS VINYLIDENE FLUORIDE RESIN MEMBRANE AND PROCESS FOR PRODUCING SAME - A porous membrane of vinylidene fluoride resin, comprising a substantially single layer membrane of vinylidene fluoride resin having two major surfaces sandwiching a certain thickness, including a dense layer that has a small pore size and governs a filtration performance on one major surface side thereof, having an asymmetrical gradient network structure wherein pore sizes continuously increase from the one major surface side to the other opposite major surface side, and satisfying conditions: (a) the dense layer includes a 5 μm-thick portion contiguous to the one major surface showing a porosity A | 06-28-2012 |
20140080004 | CARBONACEOUS MATERIAL FOR NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY NEGATIVE ELECTRODE - The object of the present invention is to provide a carbonaceous material for a negative electrode of non-aqueous electrolyte secondary batteries having a great charge-discharge capacity, high charge-discharge efficiency, and an excellent charge-discharge cycle characteristic. | 03-20-2014 |
20150024277 | CARBONACEOUS MATERIAL FOR NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY - An object of the present invention is to provide a carbonaceous material for a non-aqueous electrolyte secondary battery having excellent output characteristics and exhibiting excellent cycle characteristics, and a negative electrode using the same. | 01-22-2015 |
20150180020 | CARBONACEOUS MATERIAL FOR ANODE OF NANAQUEOUS ELECTROLYTE SECONDARY BATTERY, PROCESS FOR PRODUCING THE SAME, AND ANODE AND NONAQUEOUS ELECTROLYTE SECONDARY BATTERY OBTAINED USING THE CARBONACEOUS MATERIAL - The object of the present invention is to provide a carbonaceous material for an anode of a nonaqueous electrolyte secondary battery which uses a plant-derived organic material as a raw material, has high purity so that alkali metals such as the potassium element are sufficiently removed by de-mineral, and has excellent cycle characteristics, and to provide a lithium ion secondary battery using the carbonaceous material. | 06-25-2015 |
20150188137 | CARBONACEOUS MATERIAL FOR ANODE OF NONAQUEOUS ELECTROLYTE SECONDARY BATTERY, AND METHOD FOR MANUFACTURING THE SAME - The object of the present invention is to provide a carbonaceous material for an anode of a nonaqueous electrolyte secondary battery which uses a plant-derived organic material as a raw material, has high purity so that alkali metals such as the potassium element and alkali earth metals such as the calcium element are sufficiently removed by de-mineral treatment, and has excellent discharge capacity and efficiency, a novel manufacturing method capable of efficiently mass-producing the carbonaceous material, and a lithium ion secondary battery using the carbonaceous material. | 07-02-2015 |