Appeal 2006-0868
Application 10/005,846
7. The method of Claim 1 wherein the thermoplastic olefin elastomer is
selected from the group of ethylene-propylene rubbers, ethylene-propylene-
diene terpolymer rubber, and combinations thereof.
8. A method of improving the mechanical strength of a membrane
comprising the step of:
providing a microporous sheet having a Gurley air permeability less
than 35 seconds/10cc comprising a blend of an aliphatic polyolefin selected
from the group consisting of polyethylene, polypropylene, copolymer
thereof, and blends thereof, and a thermoplastic olefin elastomer being
selected from the group consisting of ethylene-propylene rubbers, ethylene-
propylene-diene terpolymer rubbers, and combinations thereof, with the
elastomer comprising 3 to 7 percent by blend weight.
9. A diffusion membrane comprising:
a dry stretched microporous sheet comprising a blend of an aliphatic
polyolefin and a thermoplastic olefin elastomer, the elastomer comprising
less than 10 percent by blend weight, the polyolefin being selected from the
group consisting of polyethylene, polypropylene4, copolymers thereof, and
blends thereof, the thermoplastic olefin elastomer being selected from the
group consisting of ethylene-propylene rubbers, ethylene-propylene-diene
terpolymer rubbers, and combinations thereof.
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