Patent ID: 8771859
Filing Date: 2014-07-08
Classification: H01M,Y02E

Abstract:
1. A separator for batteries, comprising a multilayer porous film including a resin porous film containing a thermoplastic resin as a main component and a heat resistant porous layer containing heat resistant particles as a main component, wherein the heat resistant porous layer has a thickness of 1 to 15 μm, the heat resistant porous layer contains: 0.1 to 5 parts by mass of an N-vinylacetamide polymer or a water-soluble cellulose derivative per 100 parts by mass of the heat resistant particles; and 1 part by mass or more and 30 parts by mass or less of an acrylic resin forming a crosslinked structure per 100 parts by mass of the heat resistant particles, and the water-soluble cellulose derivative is carboxymethyl cellulose, hydroxyethyl cellulose, or hydroxypropyl cellulose.