Chalking-resistant, calcined kaolin clay pigment and method of m

Details Chalking-resistant, calcined kaolin clay pigment and method of m Chalking-resistant, calcined kaolin clay pigment and method of m

1981-12-02

1984-01-24

Meros, Edward J.

Compositions: coating or plastic

Materials or ingredients

C09C 142

Patent

active

044274505

ABSTRACT:
Novel pigments useful as primary extenders in exterior grade latex formulations are described. The pigments are composed of particles of calcined clay, substantially all the particles 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 characterized 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 substantially reducing opacity or chalking resistance.

REFERENCES:
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patent: 3014836 (1961-12-01), Proctor
patent: 3226252 (1965-12-01), Hemstock
patent: 3383438 (1968-05-01), Allegrini et al.
patent: 3403041 (1968-09-01), Lyons et al.
patent: 3754712 (1973-08-01), Cecil
patent: 4118246 (1978-10-01), Horzera et al.
patent: 4241142 (1980-12-01), Kaliski et al.

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