Patent ID: 9184449
Filing Date: 2015-11-10
Classification: H01M,Y02E,Y10T

Abstract:
1. An oxygen permeable film comprising water-repellent, fluorocarbon resin particles, wherein said water-repellent particles are comprised of fluorocarbon resin particles having an average particle size of 0.01 to 50 μm, said oxygen permeable film has a contact angle with water of not less than 130° , said oxygen permeable film comprises a film surface and pores having inner walls, and said fluorocarbon resin particles are fused in point contact with one another at a temperature of 10° C. to 60° C. lower than the melting point of the resin, with a provision that when the fluorocarbon resin particles comprise polytetrafluoroethylene, the fluorocarbon resin particles are fused at a temperature of 250° C. to 310° C., and said fluorocarbon resin particles form irregularities on the film surface and the inner walls of the pores.