C - Chemistry – Metallurgy – 09 – C
Patent
C - Chemistry, Metallurgy
09
C
6/212, 9/65
C09C 1/42 (2006.01) D21H 17/68 (2006.01) D21H 21/52 (2006.01)
Patent
CA 2035117
ABSTRACT A low-abrasion calcined kaolin opacifying pigment composed of particles in the size range of about 70 to 84% by weight finer than 2 microns and having a color defined by Hunter Trisitimulus values of "L" within the range of 92 to 94, "a" within the range of +1.0 to +2.2 and "b" within the range of +6.4 to +7.5. The pigment is produced by novel wet processing including high solids degritting of a high iron, high titania content Tertiary kaolin without conventional fractionation, bleaching and dewatering to isolate a fine particle size fraction, followed by spray drying, pulverization, calcination and repulverization. ILM\3258 120890
Babiec John S. Jr.
Berube Richard R.
Jameson M. Phillip
Negele Andrew R.
Willis Mitchell J.
Sim & Mcburney
The Engelhard Corporation
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