Compositions: coating or plastic – Materials or ingredients – Pigment – filler – or aggregate compositions – e.g. – stone,...
Patent
1998-05-01
1999-12-07
Marcheschi, Michael
Compositions: coating or plastic
Materials or ingredients
Pigment, filler, or aggregate compositions, e.g., stone,...
106467, 106468, 106470, 106466, 10628717, 1062865, 10628734, 502 68, C09C 142, C09C 128, C09C 102, C09C 104, C04B 1410
Patent
active
059976268
ABSTRACT:
A method for reducing the abrasion of a silica-containing calcined kaolin pigment by the controlled leaching of silica from the pigment, preferably by the use of a caustic solution to dissolve the silica out of the calcined kaolin. In another aspect of the invention, the brightness, opacity, or both of a calcined kaolin is increased by increasing the fineness of the kaolin feed supplied to the calciner. The combination of these methods results in the production of a calcined kaolin with low abrasion and high brightness and opacity. Another aspect of the invention concerns an improved method of filtration of dilatent materials such as the leached calcined clay.
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Burbank Tracey A.
Guermonprez Rene S.
Londo Michael G.
Willis Mitchell J.
Wu Joseph H. Z.
Engelhard Corporation
Marcheschi Michael
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