Multi-layer, microporous polyethylene membrane, its...

Details Multi-layer, microporous polyethylene membrane, its... Multi-layer, microporous polyethylene membrane, its...

2011-07-26

2011-07-26

Johnson, Christina (Department: 1742)

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

Separator, retainer or spacer insulating structure

C429S254000

Reexamination Certificate

active

07985497

ABSTRACT:
A multi-layer, microporous polyethylene membrane having at least two layers, which comprises (a) a microporous polyethylene resin layer A comprising high-density polyethylene A having 0.2 or more terminal vinyl groups per 10,000 carbon atoms when measured by infrared spectroscopy, and (b) a microporous polyethylene resin layer B comprising high-density polyethylene B having less than 0.2 terminal vinyl groups per 10,000 carbon atoms when measured by infrared spectroscopy, has well-balanced permeability, mechanical strength, heat shrinkage resistance, shutdown properties, meltdown properties and oxidation resistance.

REFERENCES:
patent: 5240655 (1993-08-01), Troffkin et al.
patent: 6054498 (2000-04-01), Hasegawa et al.
patent: 2002-338730 (2002-11-01), None
patent: 2005-225919 (2005-08-01), None
patent: 97/23554 (1997-07-01), None

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