Chemistry: electrical current producing apparatus – product – and – With pressure equalizing means for liquid immersion operation
Reexamination Certificate
2006-09-26
2006-09-26
Choi, Ling-Sui (Department: 1713)
Chemistry: electrical current producing apparatus, product, and
With pressure equalizing means for liquid immersion operation
C525S242000, C525S274000, C526S247000, C526S250000, C429S309000
Reexamination Certificate
active
07112383
ABSTRACT:
The present invention is directed to a binder for electrode materials which comprises tetrafluoroethylene polymer fine particles having an average particle size of not more than about 0.20 μm and having a standard specific gravity of not more than about 2.20, wherein a mixture prepared from said fine particles with about 17% by weight of the total mixture of an extrusion coagent, when subjected to the measurement of an extrusion pressure by a rheometer, exhibits under the conditions of a draw ratio of 100 to 1 and an extrusion speed of 18±2 mm/min, an extrusion pressure of not less than about 220 kg/cm2.
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Choi Ling-Sui
DuPont-Mitsui Fluorochemicals Co. Ltd.
Hu Henry S.
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