Abstract: The purpose of the present invention is to provide an electret fiber sheet that has high collection performance and that is suitably used in an air filter, etc. The present invention is an electret fiber sheet configured from polyolefin-based resin fibers comprising a polyolefin-based resin composition containing a high-crystalline polyolefin resin and a low-crystalline polyolefin resin, wherein the mass ratio of the low-crystalline polyolefin resin in the polyolefin-based resin composition is 0.5-10 mass % (inclusive) relative to the total mass of the high-crystalline polyolefin-based resin and the low-crystalline polyolefin resin, and a hindered-amine-based compound is included in the electret fiber sheet in an amount of 0.1-5.0 mass % (inclusive).

Abstract: The present invention provides an electret fiber sheet having superior recovery of airflow volume by heat treatment and having high air permeability. The electret fiber sheet of the present invention is a nonwoven fabric formed from long fibers that are formed from a thermoplastic resin and have an average single fiber diameter of 0.1 to 8.0 ?m, wherein a bulk density of the nonwoven fabric is 0.05 to 0.30 g/cm3 and the long fibers contain a crystal nucleating agent at 0.005 to 1.0% by mass.

Abstract: An object of the present invention is to provide an electret nonwoven fabric that includes thin fibers and in which fusion between fibers is controlled so that the electret nonwoven fabric may have high collection efficiency, low pressure loss, and high strength, and an air filter material including the electret nonwoven fabric. The nonwoven fabric of the present invention is a nonwoven fabric including a constituent fiber containing a thermoplastic resin, the constituent fiber containing at least a first component and a second component, either one or both of the first component and the second component containing a crystal nucleating agent, the first component and the second component having a difference in crystallization start temperature of 5° C. or more, at least part of both the first component and the second component being exposed to a surface of the constituent fiber.

Abstract: The present invention provides an electret fiber sheet having superior recovery of airflow volume by heat treatment and having high air permeability. The electret fiber sheet of the present invention is a nonwoven fabric formed from long fibers that are formed from a thermoplastic resin and have an average single fiber diameter of 0.1 to 8.0 ?m, wherein a bulk density of the nonwoven fabric is 0.05 to 0.30 g/cm3 and the long fibers contain a crystal nucleating agent at 0.005 to 1.0% by mass.

Abstract: A p-type impurity diffusion composition is provided which makes it possible to improve storage stability of a coating liquid, and to achieve uniform diffusion of the coating liquid on a semiconductor substrate. The p-type impurity diffusion composition includes (A) a group-13 element compound, (B) a hydroxyl-group-containing polymer, and (C) an organic solvent, (Cl) a cyclic ester solvent being contained in the organic solvent.

Abstract: An impurity-diffusing composition including (A) a polysiloxane represented by Formula (1) and (B) an impurity diffusion component. In the formula, R1 represents an aryl group having 6 to 15 carbon atoms, and a plurality of R1 may be the same or different. R2 represents any of a hydroxyl group, an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an acyl group having 2 to 6 carbon atoms, and an aryl group having 6 to 15 carbon atoms, and a plurality of R2 may be the same or different. R3 and R4 each represent any of a hydroxyl group, an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, and an acyl group having 2 to 6 carbon atoms, and a plurality of R3 and a plurality of R4 each may be the same or different. The ratio of n:m is 95:5 to 25:75.

Abstract: An impurity-diffusing composition including (A) a polysiloxane represented by Formula (1) and (B) an impurity diffusion component. In the formula, R1 represents an aryl group having 6 to 15 carbon atoms, and a plurality of R1 may be the same or different. R2 represents any of a hydroxyl group, an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an acyl group having 2 to 6 carbon atoms, and an aryl group having 6 to 15 carbon atoms, and a plurality of R2 may be the same or different. R3 and R4 each represent any of a hydroxyl group, an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, and an acyl group having 2 to 6 carbon atoms, and a plurality of R3 and a plurality of R4 each may be the same or different. The ratio of n:m is 95:5 to 25:75.