Silicas
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United States of America Patent
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-
Jul 30, 1991
Issued Date -
N/A
app pub date -
Oct 29, 1990
filing date -
Sep 15, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Amorphous silicas suitable for use as abrasives in transparent toothpastes can be prepared by a precipitation route. These silicas are distinguished by having a BET surface area of 420 to 550 m.sup.2 /g, a weight mean particle size of 5 to 20 micron, a perspex abrasion value of 15 to 28, a mean pore diameter from 3 to 8 nm and a transmission of at least 70% in the R1 range from 1.444 to 1.460.
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