H - Electricity – 01 – M
Patent
H - Electricity
01
M
319/49
H01M 2/16 (2006.01)
Patent
CA 1258690
ABSTRACT OF THE DISCLOSURE Microporous polymeric battery separator, e.g., rubber separa- tors, exhibit reduced electrical resistance when reinforced with a sili- ceous filler composed of agglomerates of essentially hollow spherical precipitated siliceous particles. The siliceous filler is characterized by a surface area of between about 50 and 250 square meters per gram, a predominant hollow spherical unit particle size of between about 0.005 and about 5.0 microns and an oil absorption of from about 150 to 300 grams per hundred grams of siliceous filler. The hollow spherical precip- itated siliceous filler can be prepared by precipitating siliceous pig- ment onto finely divided water insoluble inorganic salt, e.g., calcium carbonate, and subsequently removing the insoluble inorganic salt, e.g., by leaching with an acid such as hydrochloric acid.
494463
Johnson Harlan B.
Krivak Thomas G.
Borden Ladner Gervais Llp
Ppg Industries Ohio Inc.
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