Patent ID: 8597775
Filing Date: 2013-12-03
Classification: B01D,B29C,B32B,H01M,Y02E,Y10T

Abstract:
1. A microporous polyolefin multilayer film comprising an inner layer made of a resin mixture containing polypropylene of 50-90 wt % having a melting temperature of 160° C. or higher and polyethylene of 10-50 wt % having a melting temperature of 125° C. to 135° C. and a surface layer formed on both surfaces of the inner layer, made of a resin mixture containing polyethylene of 95% or more having a melting temperature of 125° C. or higher, wherein a thickness of the film is 9-50 μm, a puncture strength is 0.15N/μm or more, a permeability is 1.5×10