Abstract: The present invention provides a polarized electrode 12 containing mixed activated carbon composed of at least two activated carbons with different specific surface areas, and the specific surface area of the mixed activated carbon is not less than 900 m2/g and less than 1900 m2/g. By setting the specific surface area of the mixed activated carbon to less than 1900 m2/g, the resistance reduction ratio of the polarized electrode 12 rapidly increases.

Abstract: A nonwoven fabric composed of ultra-fine continuous fibers having a mean fineness of not more than 0.5 dtex is prepared. The nonwoven fabric comprises a water-soluble thermoplastic resin in a proportion of not more than 5% by weight relative to the nonwoven fabric, has an absorbing height of not less than 30 mm as determined at 20° C. after 10 minutes based on Byreck method when the nonwoven fabric immersion-treated for 60 minutes in a water of 80° C. is used, and satisfies the following formula: (B)/(A)?0.25, wherein the symbol (B) represents a tensile strength [N/5 cm] in the longitudinal direction and the lateral direction of the nonwoven fabric and the symbol (A) represents a fabric weight [g/m] of the nonwoven fabric. In the nonwoven fabric, not less than 30% of the surface may be coated with the water-soluble thermoplastic resin. The water-soluble thermoplastic resin may be a water-soluble thermoplastic polyvinyl alcohol, e.g.

Abstract: A polarizable electrode to be used in an electric double layer capacitor, which has an excellent depressing effect on the generation of gas, is coated on the surface thereof with a thin film layer of a gelling organic polymer compound whose thickness is less than 5 ?m. As the gelling organic polymer compound, organic polymer compounds having —COO— bonds, or preferably acrylic polymers, can be used. Specific examples thereof include polyalkyl methacrylate or polyalkyl acrylate, which are capable of forming a stereocomplex. Among these, poly(methyl methacrylate) is preferable. Polyvinylidene fluoride resins can also be preferably used. It is preferable that an electrical double layer capacitor include a pair of polarizable electrodes and a separator disposed therebetween and that at least one of the pair of polarizable electrodes be the above-described polarizable electrode having an excellent depressing effect on the gas generation.

Abstract: In activated carbon obtained by subjecting a carbonaceous material to an activation treatment, the overall content of alkali metals is set at 100 ppm or less, or the overall content of heavy metals is set at 20 ppm or less and the overall content of alkali metals is set at 200 ppm or less. In cases where such activated carbon is used as a raw material in electronic devices, the formation of dendrites by the reductive deposition of alkali metals or heavy metals tends not to occur, so that problems such as short-circuiting or the like tend not to arise, and a good rate of self-discharge retention is shown.

Abstract: Activated carbon useful as polarizable electrode material for an electric double-layer capacitor can be obtained by mixing a carbonaceous material and an alkali metal hydroxide while maintaining a solid state, granulating the obtained mixture while maintaining its solid state, dehydrating the obtained granulated substance while maintaining its solid state, and subjecting the granulated dehydration product obtained in the dehydration step to an activation treatment. The preferred pressure of the granulation treatment in the granulation step is 0.01 to 300 Torr, and the preferred temperature of the granulation treatment is 90 to 140° C. The preferred pressure of the dehydration treatment in the dehydration step is 0.01 to 10 Torr, and the preferred temperature of the dehydration treatment is 200 to 400° C.

Abstract: The present invention provides a polarized electrode 12 containing mixed activated carbon composed of at least two activated carbons with different specific surface areas, and the specific surface area of the mixed activated carbon is not less than 900 m2/g and less than 1900 m2/g. By setting the specific surface area of the mixed activated carbon to less than 1900 m2/g, the resistance reduction ratio of the polarized electrode 12 rapidly increases.

Abstract: The use of an activated carbon precursor having a weight reduction rate of 1% or less from the temperature at which its weight reduction ends according to thermogravimetric analysis, to 500 C, when manufacturing activated carbon by activating an activated carbon precursor obtained by heating a mixture of a carbonaceous material and an alkali metal hydroxide at a reduced pressure and/or in the presence of an inert gas.

Abstract: In activated carbon obtained by subjecting a carbonaceous material to an activation treatment, the overall content of alkali metals is set at 100 ppm or less, or the overall content of heavy metals is set at 20 ppm or less and the overall content of alkali metals is set at 200 ppm or less. In cases where such activated carbon is used as a raw material in electronic devices, the formation of dendrites by the reductive deposition of alkali metals or heavy metals tends not to occur, so that problems such as short-circuiting or the like tend not to arise, and a good rate of self-discharge retention is shown.

Abstract: Activated carbon useful as polarizable electrode material for an electric double-layer capacitor can be obtained by mixing a carbonaceous material and an alkali metal hydroxide while maintaining a solid state, granulating the obtained mixture while maintaining its solid state, dehydrating the obtained granulated substance while maintaining its solid state, and subjecting the granulated dehydration product obtained in the dehydration step to an activation treatment. The preferred pressure of the granulation treatment in the granulation step is 0.01 to 300 Torr, and the preferred temperature of the granulation treatment is 90 to 140° C. The preferred pressure of the dehydration treatment in the dehydration step is 0.01 to 10 Torr, and the preferred temperature of the dehydration treatment is 200 to 400° C.

Abstract: A nonwoven fabric composed of ultra-fine continuous fibers having a mean fineness of not more than 0.5 dtex is prepared. The nonwoven fabric comprises a water-soluble thermoplastic resin in a proportion of not more than 5% by weight relative to the nonwoven fabric, has an absorbing height of not less than 30 mm as determined at 20° C. after 10 minutes based on Byreck method when the nonwoven fabric immersion-treated for 60 minutes in a water of 80° C. is used, and satisfies the following formula: (B)/(A)?0.25, wherein the symbol (B) represents a tensile strength [N/5 cm] in the longitudinal direction and the lateral direction of the nonwoven fabric and the symbol (A) represents a fabric weight [g/m] of the nonwoven fabric. In the nonwoven fabric, not less than 30% of the surface may be coated with the water-soluble thermoplastic resin. The water-soluble thermoplastic resin may be a water-soluble thermoplastic polyvinyl alcohol, e.g.

Abstract: An activated carbon which is prepared from granular isotropic pitch.

Abstract: The present invention provides an activated carbon produced by a process, which includes: activating a carbonaceous material, to obtain an activated carbonaceous material; and contacting the activated carbonaceous material with an acid. Another embodiment of the present invention provides an electrode for an electric double-layer capacitor, which includes the above-described activated carbon. Another embodiment of the present invention provides a filter, which includes the above-described activated carbon. Another embodiment of the present invention provides a shaped article, which includes the above-described activated carbon. Another embodiment of the present invention provides a method for producing activated carbon, which includes activating a carbonaceous material, to obtain an activated carbonaceous material; and contacting the activated carbonaceous material with an acid, to obtain the activated carbon.

Abstract: A hollow fiber membrane made of an ethylene-vinyl alcohol polymer, comprises a dense layer existing in the inner surface and a porous layer existing in the layer other than the dense layer, wherein the hollow fiber membrane has a porosity of 60 to 90%, an overall mass transfer coefficient for myoglobin in a water-based system of not less than 0.003 cm/min., and a rejection rate for albumin in a bovine blood system of not less than 97%. The EVA hollow fiber membrane is useful for hemopurification membranes such as hemodialysis membranes, hemodiafiltration membranes, hemofiltration membranes and continuous hemofiltration membranes, and a process for producing the same.

Abstract: An activated carbon which is prepared from granular isotropic pitch.

Abstract: A hollow fiber membrane made of an ethylene-vinyl alcohol polymer, comprising a dense layer existing in the inner surface and a porous layer existing in the layer other than the dense layer, wherein the hollow fiber membrane has a porosity of 60 to 90%, an overall mass transfer coefficient for myoglobin in a water-based system of not less than 0.003 cm/min., and a rejection rate for albumin in a bovine blood system of not less than 97%. The EVA hollow fiber membrane is useful for hemopurification membranes such as hemodialysis membranes, hemodiafiltration membranes, hemofiltration membranes and continuous hemofiltration membranes, and a process for producing the same.