Patent ID: 8865336
Filing Date: 2014-10-21
Classification: H01M,Y02E,Y10S

Abstract:
1. A separator for alkaline batteries having a composite sheet comprising: a continuous polyvinyl alcohol nanofiber layer formed from a polyvinyl alcohol polymer modified with at least one modifying component and having a fiber diameter of 10 to 1000 nm, the nanofiber layer having a liquid absorption amount by fibers of 4.0 to 40.0 g/g after immersion in a 35% aqueous solution of KOH, wherein the at least one modifying component is an unsaturated carboxylic acid, an unsaturated carboxylic acid derivative, an unsaturated sulfonic acid, an unsaturated sulfonic acid derivative, a borane acid complex, a borane complex, a borane complex derivative, a vinyl ester, an amine, an acrylamide, a methacrylamide, an allyl alcohol, or vinyl pyrrolidone; and a base layer joined to the nanofiber layer, the base layer comprising a wet-type nonwoven material made of alkaline resistant fibers and having a density of 0.1 to 0.4 g/cm