Modified, precipitated alumino silicate pigments

Details Modified, precipitated alumino silicate pigments Modified, precipitated alumino silicate pigments

1977-09-30

1981-04-07

Howard, Jacqueline V.

Compositions: coating or plastic

Materials or ingredients

Miscellaneous

106288B, C09C 102, C09C 128, C09C 140

Patent

active

RE0305685

ABSTRACT:
Novel alkali aluminum silicate particulates, modified with and containing a chemically bound alkaline earth metal, are disclosed. The alumino silicate pigments contain an alkaline earth metal, preferably calcium or magnesium, in addition to an alkali metal, such as sodium. In chemical composition, the pigments contain oxides of the alkaline earth metal, the alkali metal, aluminum and silicon and are distinguishable from co-precipitates. The pigments are prepared by introducing dilute solutions of an alkali silicate and an aluminum salt of a mineral acid into an agitated aqueous receiving medium containing an alkaline earth salt or hydroxide. The pH of the fluid reaction medium may be controlled to form finely divided precipitated particulates having improved properties and which may be used as pigments in paper, paint, rubber, inks, plastics, and the like.

REFERENCES:
patent: 2739073 (1956-03-01), Bertorelli
patent: 2848346 (1958-08-01), Bertorelli
patent: 3746559 (1973-07-01), Hackbarth
patent: 3798046 (1974-03-01), Fitton

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