Spacer/extender for titanium dioxide in pigment systems for coat

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106442, 106446, B32B 516

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active

051716313

ABSTRACT:
A coating composition and method of coating for producing a coating containing at least 21-22% by volume titanium dioxide pigment for developing hiding on a suitable substrate, the coating composition having a pigment volume concentration (PVC) of up to a critical pigment volume concentration (CPVC), preferably a PVC of from about 25% to about 50-60% and more preferably from about 25% to about 45%, and a pigment system including an optional filler and a prime pigment comprising about 70-98% by volume titanium dioxide (TiO.sub.2), preferably a rutile form having a median particle size of about 0.2 microns, and about 2-30% by volume of an aluminum trihydrate (ATH) spacer/extender pigment having a similar median particle size and particle size distribution, preferably substantially the same as for the TiO.sub.2 pigment.

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Williams, J. E., Jr., "Hydrated Alumina Extenders", Paint and Varnish Production, Jun. 1967.
Ritter, H. W., et al., "Influence of Fine Particle Extenders on Hiding Pigment Performance in Latex Paints", Journal of Paint Technology, vol. 38, No. 500, Sep. 1966.

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