Patent ID: 8602223

Claim:
A micro-porous membrane comprising a porous membrane carrier made of a first polymeric material (A) and comprising a second polymeric material (B) intimately divided throughout the porous membrane carrier, wherein (a) the porous membrane carrier (i) comprises a plurality of interconnected polymeric fibers, fibrils, filaments and/or lamellae having a thickness of less than 1 μm, (ii) has an interconnected open porous structure formed by the plurality of interconnected polymeric fibers, fibrils, filaments and/or lamellae and (iii) has a porosity of at least 50%; (b) the first polymeric material (A) comprises a polyolefin; and (c) the second polymeric material (B) comprises a polyamide and is present in an amount of at most 30 wt. %, relative to the total weight of (A) and (B).