Aqueous emulsion paints contain organic white pigments
AssigneeCiba-Geigy Corporation
InventorsAlfred Renner, Werner Margotte
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Abstract
The aqueous emulsion paints according to the invention contain urea-formaldehyde white pigments having very characteristic physical properties. Compared with aqueous emulsion paints according to the prior art, which in addition to TiO.sub.2 can contain only a maximum of 20% by weight of UF white pigments based on the entire content of white pigments, according to the invention TiO.sub.2 may be substituted up to 100% by the UF white pigment. The resultant finishes are fast to light, weather and abrasion.
Claims3
In a conventional aqueous emulsion paint composition comprising emulsified or suspended organic binders, a pigment and an aqueous medium for the binder and pigment, the improvement, to give a composition with high hiding power and whiteness, which comprises as the sole white pigment component a urea-formaldehyde condensation polymer having a light scattering coefficient of greater than or equal to 800 cm.sup.2 /g, a pore volume of less than or equal to 3 cm.sup.3 /g, an average primary particle diameter of 0.2 to 2 .mu.m, a melting range (on decomposition) of 240.degree. to 260.degree. C., and a bulk density of >100 g/l.
Dependencies are inferred from the claim text.