Chalking-resistant, calcined kaolin clay pigment and method...

Details Chalking-resistant, calcined kaolin clay pigment and method... Chalking-resistant, calcined kaolin clay pigment and method...

C - Chemistry, Metallurgy

09

C

6/212

C09C 1/42 (2006.01) C09C 3/04 (2006.01)

Patent

CA 1165512

CHALKING-RESISTANT, CALCINED KAOLIN CLAY PIGMENT AND METHOD OF MAKING ABSTRACT Novel pigments useful as primary extenders in exterior grade latex formulations are described. The pigments are com- posed of particles of calcined clay, substantially all the parti- cles of which are finer than about 44 microns and having an average particle size, equivalent spherical diameter, within the range of about 3 to 10 microns, most preferably within the range of about 4 to 8 microns. The novel pigments are further charac- terized by having a significantly lower oil absorption value (ASTM) than conventional, calcined clay pigments. Exterior grade paint formulations containing such pigments can be formulated below the critical pigment volume concentration without substan- tially reducing opacity or chalking resistance.

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