Abstract: A circuit board nonwoven fabric comprising a paper-formed structure which comprises a plurality of thick fibers in which the portion of greatest fiber diameter is 5 ?m or greater, and a plurality of fine fibers in which the portion of greatest fiber diameter is less than 5 ?m, wherein an average fiber length of the thick fibers is greater than an average fiber length of the fine fibers, the number of fine fibers is greater than the number of thick fibers, and the thick fibers have a flat shape with a major axis and a minor axis, the minor axis being oriented in a thickness direction of the paper-formed structure.

Abstract: A separator for an electrochemical element suitable extends the service life of an electrochemical element under high temperature conditions. This separator for an electrochemical element is disposed between a pair of electrodes and is for separating the two electrodes from each other and retaining an electrolytic solution, wherein the separator contains a cellulose-based fiber, and the limiting viscosity of the separator as measured by the measurement method specified in JIS P 8215 is in a range of 150-500 ml/g.

Abstract: A separator for an electrochemical element suitable extends the service life of an electrochemical element under high temperature conditions. This separator for an electrochemical element is disposed between a pair of electrodes and is for separating the two electrodes from each other and retaining an electrolytic solution, wherein the separator contains a cellulose-based fiber, and the limiting viscosity of the separator as measured by the measurement method specified in JIS P 8215 is in a range of 150-500 ml/g.

Abstract: A separator for an electrochemical element interposed between a pair of electrodes, capable of holding an organic electrolytic solution contains an electrolyte. The separator is a wet-laid nonwoven fabric containing 10-50 mass % of thermoplastic synthetic fibers and 50-90 mass % of beaten regenerated cellulose fibers having a mean fiber length of 0.2-2.0 mm, the separator has a thickness of 10-70 ?m and a density of 0.25-0.90 g/cm3, including two parts obtained by bisecting a cross-section of the separator in a thickness direction. Two A-parts with a small number of the thermoplastic synthetic fibers and B-part with a large number of the thermoplastic synthetic fibers, and the A and B parts are formed into a single layer in an integrated manner; a value obtained by dividing the number of thermoplastic synthetic fibers in the A part by the number of the thermoplastic synthetic fibers in the B part is 0.85 or less.

Abstract: Provided is a separator for an electrochemical element that suppresses capacitance drop and voltage drop after use for a long time in a high temperature environment. The separator for an electrochemical element is a separator interposed between a pair of electrodes for isolating both the electrodes from each other and holding an electrolytic solution, in which the separator contains a cellulose-based fiber, and the total content of chlorine in the separator is 30 ppm or less.

Abstract: A separator for an electrochemical element interposed between a pair of electrodes, capable of holding an organic electrolytic solution contains an electrolyte. The separator is a wet-laid nonwoven fabric containing 10-50 mass % of thermoplastic synthetic fibers and 50-90 mass % of beaten regenerated cellulose fibers having a mean fiber length of 0.2-2.0 mm, the separator has a thickness of 10-70 ?m and a density of 0.25-0.90 g/cm3, including two parts obtained by bisecting a cross-section of the separator in a thickness direction. Two A-parts with a small number of the thermoplastic synthetic fibers and B-part with a large number of the thermoplastic synthetic fibers, and the A and B parts are formed into a single layer in an integrated manner; a value obtained by dividing the number of thermoplastic synthetic fibers in the A part by the number of the thermoplastic synthetic fibers in the B part is 0.85 or less.

Abstract: The present invention provides an electrolyte holder for a lithium secondary battery capable of holding an electrolytic solution inside electrodes or at an interface between the separator and each of the electrodes, preventing electrolyte shortage inside the electrodes, and restraining dendrite from precipitating and growing and also provide the lithium secondary battery, using the electrolyte holder, which is capable of achieving a cycle life to such an extent that the lithium secondary battery can be used for industrial application. An electrolyte holder (3) for use in the lithium secondary battery consists of a multi-layer structure having at least two hydrophilic fibrous layers (A, B) having different porosities. The electrolyte holder (3) is composed of an electrode group formed by winding a cathode (2) and an anode (1) or laminating the cathode (2) and the anode (1) one upon another with an electrolyte holder (3) serving as a separator interposed between the cathode (2) and the anode (1).

Abstract: A separator is described having high safety, high output characteristics, and excellent heat resistance, and a nonaqueous battery including the separator. The separator is characterized in that it is a porous sheet formed using a specifically fibrillated raw material that has fibrillated, regenerated-cellulose fibers as necessary main components. Average pore diameter of through-holes is 0.03 ?m to 1.0 ?m inclusive. A nonaqueous battery is then manufactured using this separator.

Abstract: The present invention provides an electrolyte holder for a lithium secondary battery capable of holding an electrolytic solution inside electrodes or at an interface between the separator and each of the electrodes, preventing electrolyte shortage inside the electrodes, and restraining dendrite from precipitating and growing and also provide the lithium secondary battery, using the electrolyte holder, which is capable of achieving a cycle life to such an extent that the lithium secondary battery can be used for industrial application. An electrolyte holder (3) for use in the lithium secondary battery consists of a multi-layer structure having at least two hydrophilic fibrous layers (A, B) having different porosities. The electrolyte holder (3) is composed of an electrode group formed by winding a cathode (2) and an anode (1) or laminating the cathode (2) and the anode (1) one upon another with an electrolyte holder (3) serving as a separator interposed between the cathode (2) and the anode (1).

Abstract: A method of forming a battery separator to be sandwiched between a positive and a negative electrode of a battery is discussed. A polyethylene resin surface is formed on a surface of a nonwoven fabric, which is made of polypropylene resin as a main component material and structured with bonded pieces of the polypropylene resin. The polyethylene resin surface is then subjected to a hydrophilization treatment, such as a radical reaction treatment or a sulfonation treatment. As a result, a secondary battery separator having a high mechanical strength along with a high hydrophilic nature, and a secondary battery using that secondary battery separator are provided.

Abstract: A polyethylene resin surface is formed on a surface of a nonwoven fabric, which is made of polypropylene resin as a main component material and structured with bonded pieces of the polypropylene resin. The polyethylene resin surface is then subjected to a hydrophilization treatment, such as a radical reaction treatment or a sulfonation treatment. As a result, a secondary battery separator having a high mechanical strength along with a high hydrophilic nature, and a secondary battery using that secondary battery separator are provided.

Abstract: A thin separator paper is provided for separating a positive electrode active material and a negative electrode active material from one another in alkaline battery. The separator paper has high gas tightness, high shortage preventing effect, and low deterioration. The separator paper possesses a crystalline structure in which cellulose 1 and cellulose 2 coexist. A ratio of the cellulose 2 is controlled in relation to the cellulose 1 and the separator paper is made by using an alkali treated pulp beaten from CSF 50 ml to 0 ml, as a raw material. The separator paper has the thickness between 15 ?m and 60 ?m, the gas tightness between 10 minutes/100 ml and 800 minutes/100 ml, and the area shrinkage rate which is not greater than 2%. Also provided is an alkaline battery containing the separator paper.

Abstract: A thin separator paper is provided for separating a positive electrode active material and a negative electrode active material from one another in alkaline battery. The separator paper has high gas tightness, high shortage preventing effect, and low deterioration. The separator paper possesses a crystalline structure in which cellulose 1 and cellulose 2 coexist. A ratio of the cellulose 2 is controlled in relation to the cellulose 1 and the separator paper is made by using an alkali treated pulp beaten from CSF 50 ml to 0 ml, as a raw material. The separator paper has the thickness between 15 ?m and 60 ?m, the gas tightness between 10 minutes/100 ml and 800 minutes/100 ml, and the area shrinkage rate which is not greater than 2%. Also provided is an alkaline battery containing the separator paper.