APPENDIX
1. A method of improving the mechanical strength of a membrane
comprising the step of:
providing a microporous sheet comprising a blend of an aliphatic
polyolefin and a thermoplastic olefin elastomer selected from the group of
ethylene-propylene rubbers, ethylene-propylene-diene terpolymer rubbers,
and combinations thereof with the elastomer comprising less than 10 percent
by blend weight.
2. The method of Claim 1 wherein the elastomer comprises about 2 to 10
percent by blend weight.
3. The method of Claim 2 wherein the elastomer comprises about 3 to 7
percent by blend weight.
4. The method of Claim 1 wherein the microporous sheet has a Gurley air
permeability less than 35 seconds/10cc.
5. The method of Claim 4 wherein the microporous sheet has a Gurley air
permeability less than 25 seconds/10cc.
6. The method of Claim 1 wherein the polyolefins selected from
polyethylene, polypropylene, copolymers thereof, and blends thereof.
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Last modified: November 3, 2007