Calcined kaolin clay filler pigment for enhancing opacity and pr

Details Calcined kaolin clay filler pigment for enhancing opacity and pr Calcined kaolin clay filler pigment for enhancing opacity and pr

1990-02-14

1991-04-30

Group, Karl

Compositions: coating or plastic

Materials or ingredients

Pigment, filler, or aggregate compositions, e.g., stone,...

106485, 106486, 501144, 501145, 1621816, 1621818, C04B 1410

Patent

active

050115340

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 .sup.+ 1.0 to .sup.+ 2.2 and "b" within the range of .sup.+6.4 to .sup.+ 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.

REFERENCES:
patent: 3372043 (1968-03-01), Fanselow
patent: 4381948 (1983-05-01), McConnell et al.
patent: 4717559 (1988-01-01), Cummings et al.

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