Kaolin clay-based pigment

Details Kaolin clay-based pigment Kaolin clay-based pigment

1985-02-13

1986-03-25

Lieberman, Paul

Compositions: coating or plastic

Materials or ingredients

1062865, 106304, 106309, C09C 122, C09C 140

Patent

active

045781184

ABSTRACT:
A substantially white, anhydrous, amorphous aluminosilicate pigment is obtained by calcining a combination of previously uncalcined kaolin clay and an alumina source. The calcination is carried out at a temperature of about 870.degree. C. to 1400.degree. C., preferably about 870.degree. C. to 1260.degree. C., for a suitable period of time, e.g., 0.1 to 3 hours. The pigments obtained by the foregoing method display enhanced brightness greater than the merely additive brightness which would be obtained by mixing alumina with a previously calcined kaolin clay and are otherwise well suited for use as paper-filling or coating pigments.

REFERENCES:
patent: 3616900 (1971-11-01), Cecil et al.
patent: 3754712 (1973-08-01), Cecil
patent: 4186027 (1980-01-01), Bell et al.
patent: 4246039 (1981-01-01), Mixon, Jr.
patent: 4299807 (1981-11-01), Angel et al.
patent: 4381948 (1983-05-01), McConnell et al.
patent: 4427450 (1984-01-01), Kostauser
patent: 4498931 (1985-02-01), Kadokura

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