Methods for preparing opaque coatings and applying the same
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United States of America Patent
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Feb 6, 1990
Issued Date -
N/A
app pub date -
Jun 6, 1989
filing date -
Mar 19, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Enhanced hiding power for opacifiers in paints, inks, and other coatings is provided by employing the opacifiers, such as TiO.sub.2, ZnO, talc, CaCO.sub.3, and the like, adhered to or embedded in the surface of thermoplastic microspheres. The composite opacifier-microsphere material is readily formed with a preselected specific gravity, so that there is little tendency for the material to separate. In addition, the composite behaves in the coating as a opacifier-air interface, having a very high different in refractive indices, and exceptional hiding power. The high volume to weight ratio of the composite affords very attractive economic advantages, effectively reducing the weight proportion of opacifiers required in the formulations, and other related advantages.
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Cited Art Landscape
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