Method of making a gas recombinant battery separator

Details Method of making a gas recombinant battery separator Method of making a gas recombinant battery separator

1999-03-09

2000-04-25

Maples, John S.

Plastic and nonmetallic article shaping or treating: processes

Forming articles by uniting randomly associated particles

Plural, intermittent pressure applying

264122, 428331, 429252, H01M 216, B29C 5900

Patent

active

060540842

ABSTRACT:
A recombinant lead acid battery separator formed of a PTFE fibril matrix and a particulate, amorphous silica filler enmeshed in the PTFE matrix. The separator has a tensile strength greater than 0.5 MPa, a bulk density lower than about 0.40 gram/cc and a void volume greater than about 75%. The separator is made by mixing together PTFE and a non-evaporative lubricant, adding amorphous silica during mixing, continuing mixing until a material having a dough-like consistency is obtained, removing the dough-like material and calendering it to form a sheet, removing from about 95% to about 100% by weight of the non-evaporative lubricant from the sheet by solvent extraction, and drying the extracted sheet.

REFERENCES:
patent: 4153661 (1979-05-01), Ree et al.
patent: 5009971 (1991-04-01), Johnson et al.
patent: 5071610 (1991-12-01), Hagen et al.
patent: 5582892 (1996-12-01), Anderson

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