Compositions: coating or plastic – Materials or ingredients
Patent
1975-04-02
1977-04-05
Douglas, Winston A.
Compositions: coating or plastic
Materials or ingredients
423339, 106292, 106306, C09C 130
Patent
active
040159965
ABSTRACT:
A new precipitated silica having a unique combination of physical and chemical properties is disclosed. The silicon dioxide is produced by acidulating a solution of an alkali metal silicate having a specific SiO.sub.2 /Na.sub.2 O mol ratio with an acid until precipitation just begins. At this point, the reaction mass is aged for a period of time and thereafter the acid addition is continued until the precipitated product is obtained. Products produced in this manner exhibit lower wet cake moisture and are characterized by their low structure, low oil absorption, high abrasiveness and high pack density, and as such are distinctly different from silicas used as reinforcing fillers in rubber. An adduct material, such as aluminum, is added to control the refractive index and surface area of the precipitated product. Because of the controlled refractive index and other properties, the novel silicon dioxides have particular utility for use as abrasion and gelling agents in clear toothpaste compositions.
REFERENCES:
patent: 3235331 (1966-02-01), Nauroth
patent: 3503707 (1970-03-01), Burke, Jr.
patent: 3582379 (1971-06-01), Hackbarth
patent: 3730749 (1973-05-01), Morgan
Douglas Winston A.
Flanders Harold H.
Howard J. V.
J. M. Huber Corporation
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