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AssigneeDegussa AG
InventorsHauke Jacobsen, Werner Hartmann, Stipan Katusic, Andreas Schulz, Norbert Giesecke, Ralph Brandes, Jorg Sperlich
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The invention relates to pigments consisting of substantially spherical particles with a mean particle diameter of less than 10 .mu.m, on the basis of an oxidic or silicate substrate material with noble metal distributed extremely finely on and/or in the particles. Preferred pigments are purple-colored and are based on an oxide from the series SiO.sub.2, SnO.sub.2 and ZrO.sub.2 and gold as noble metal. The pigments are suitable for the production of ceramic decorations and for the dyeing of plastics, synthetic films and fibers as well as lacquers. Exceptional application properties are obtained by virtue of the spherical shape. The pigments are obtainable by a spray-pyrolysis process in which an aerosol consisting of a solution of at least one noble metal compound and an oxide- or silicate-forming precursor is subjected to pyrolysis; the pigment is separated from the pyrolysis gas.
A pigment consisting essentially of substantially spherical particles, with a mean particle diameter of less than 10 .mu.m, which consist essentially of an oxidic or silicate substrate material with noble metal of colloidal size distributed on and/or within the particles, wherein the pigment is purple-colored and contains as noble metal gold and optionally additionally silver and/or platinum.
A ceramic bearing a decoration, said decoration obtained from a composition comprising a pigment consisting essentially of substantially spherical particles, with a mean particle diameter of less than 10 .mu.m, which particles consist essentially of an oxidic or silicate substrate material with noble metal of colloidal size distributed on and/or within the particles.
A dyed plastic, synthetic film or fiber wherein the color is at least in part due to a pigment consisting essentially of substantially spherical particles, with a mean particle diameter of less than 10 .mu.m, which particles consist essentially of an oxidic or silicate substrate material with noble metal of colloidal size distributed on and/or within the particles.
A process for producing a pigment consisting essentially of substantially spherical particles, with a mean particle diameter of less than 10 .mu.m, which particles consist essentially of an oxidic or silicate substrate material with noble metal of colloidal size distributed on and/or within the particles, which process comprises the following steps:
In a method for the production of a ceramic decoration or for the dyeing of a plastic, a synthetic film or a fiber which comprises contacting said ceramic, plastic, synthetic film or fiber with a composition comprising a pigment, the improvement wherein the pigment is a pigment consisting essentially of substantially spherical particles, with a mean particle diameter of less than 10 .mu.m, which particles consist essentially of an oxidic or silicate substrate material with noble metal of colloidal size distributed on and/or within the particles.
Dependencies are inferred from the claim text.