Abstract: A separator for a lithium ion secondary battery with an alloy based negative electrode, wherein a dynamic friction coefficient of at least one surface is 0.1 or more and 0.4 or less, and a method for manufacturing the same.

Abstract: A method for producing a polyolefin microporous membrane, comprising the following steps (A) to (D): (A) a kneading step of kneading a polyolefin resin, a plasticizer, and an antioxidant to form a kneaded material; (B) a molding step of processing the kneaded material into a sheet-shaped molded form after the kneading step; (C) a stretching step of stretching the sheet-shaped molded form to form a stretched material, after the molding step; and (D) a porous sheet forming step of extracting the plasticizer from the stretched material to form a porous sheet, before and/or after the stretching step, wherein the step (A) is a step of kneading the plasticizer to which 0.05 to 5% by mass of the antioxidant based on the polyolefin resin is added, and the polyolefin resin.

Abstract: A separator for a lithium ion secondary battery with an alloy based negative electrode, wherein a dynamic friction coefficient of at least one surface is 0.1 or more and 0.4 or less, and a method for manufacturing the same.

Abstract: Disclosed is a microporous membrane made from a polyolefin wherein the thickness is 1-30 ?m, the porosity is 30-60%, the air permeability is 50-250 sec/100 cc, the puncture strength is 3.5-20.0 N/20 ?m, the maximum pore diameter determined by a bubble point method is 0.08-0.20 ?m, and the ratio between the maximum pore diameter and the average pore diameter (maximum pore diameter/average pore diameter) is 1.00-1.40. Since this microporous membrane made from a polyolefin is highly safe while maintaining a high permeability, it is useful especially as a separator for recent small-sized, high-capacity nonaqueous electrolyte batteries.

Abstract: Disclosed is a substantially chlorine-free polycarbonate resin for use in the production of a substrate for an optical information medium, which is produced by transesterification reaction and which comprises a plurality of aromatic polycarbonate main chains, each comprising recurring units each independently represented by formula (1): wherein the polycarbonate main chains collectively contain therein at least one heterounit (A) of formula (2): and at least one heterounit (B) of formula (3): wherein the sum of the amounts of (A) and (B) is from 0.03 to 0.3 mole %, based on the total molar amount of units (1), and the amount of (A) is at least 50 mole %, based on the total molar amount of (A) and (B), the weight average molecular weight of the polycarbonate resin being from 13,000 to 18,000.