Stable and breathable films of improved toughness and method of making the same

摘要

Uniaxially oriented microporous breathable films having exceptional toughness transverse to the direction of orientation are disclosed herein. Such films include a particulate filler and a nonelastic material including a copolymer of ethylene with at least one C4-C8 alpha -olefin monomer, such copolymers being described in the trade as "super tough", "next generation", etc., and being prepared with "new" or "improved" catalyst systems or with metallocene or similar single-site catalysts. A method of manufacture is also disclosed.