Kaolin clay-based pigment

Details Kaolin clay-based pigment Kaolin clay-based pigment

C - Chemistry, Metallurgy

09

C

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C09C 1/42 (2006.01) C09C 1/00 (2006.01) D21H 17/67 (2006.01) D21H 17/68 (2006.01) D21H 19/40 (2006.01) D21H 17/69 (2006.01)

Patent

CA 1253659

ABSTRACT OF THE DISCLOSURE A substantially white, anhydrous, amorphous alumino- silicate 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°C to 1400°C, preferably about 870°C to 1260°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.

498845

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