| abstract |
The present invention relates to uniaxially oriented microporous breathable films of exceptional toughness transverse to the direction of orientation. Such films include a particulate filler and a nonelastic material including a copolymer of ethylene with at least one C4-C8 α-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. |