Methods of preparing hydrous silica gels

Details Methods of preparing hydrous silica gels Methods of preparing hydrous silica gels

1980-02-15

1984-10-02

Silverberg, Sam

Coating processes

Medical or dental purpose product; parts; subcombinations;...

Particulate or unit-dosage-article base

424 49, 2523156, 427215, 423339, A61K 716

Patent

active

044748248

ABSTRACT:
Dentifrice compositions containing a hydrous silica gel having a water content of from about 20 to about 60 weight percent are disclosed. The abrasiveness of the gel is increased by contacting the gel with an alkaline medium to provide a gel pH of about 6 to about 10 and/or preparing the gel by drying and grinding a silica hydrogel that has been washed with an aqueous acidic solution having a temperature of from about 80.degree. to about 100.degree. F.

REFERENCES:
patent: 1772055 (1930-08-01), Miller
patent: 2481825 (1949-09-01), Connolly
patent: 2807588 (1957-09-01), White
patent: 2856268 (1958-10-01), Young
patent: 3146076 (1964-08-01), Taluenhelmo
patent: 3655580 (1972-04-01), Beau
patent: 4153680 (1979-05-01), Seybert
patent: 4180566 (1980-12-01), Wingall
patent: 4260396 (1981-04-01), Glemza

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