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Iron oxide pigments
| Details |
Inventors: Prengel, Constanze;
Assignee: Merck Patent Gesellschaft mit beschrankter Haftung (Darmstadt, DE)
Primary Examiner: Group; Karl
Assistant Examiner: Gallo; Chris
Attorney, Agent or Firm: Millen, White, Zelano & Branigan
The invention relates to iron oxide pigments based on silica, zirconium dioxide and/or titanium dioxide particles coated with iron oxide, the iron oxide content being more than 350% by weight, relative to the weight of the silica, zirconium dioxide and/or titanium dioxide particles. |
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DETAILED DESCRIPTION We claim: 1.
A pigment comprising a non platelet-shaped silica, zirconium dioxide and/or titanium dioxide particle substrate coated with iron oxide, wherein the iron oxide content is at least 350% by weight, relative to the weight of the substrate.
2.
A pigment according to claim 1, wherein the silica, zirconium dioxide and/or titanium dioxide particle has a diameter of less than 5 .
mu.
m.
3.
A pigment according to claim 1, wherein the iron oxide is doped with one or more other metal oxides.
4.
A pigment according to claim 1, wherein the iron oxide content is more than 500% by weight.
5.
A pigment according to claim 1, wherein the iron content is more than 750% by weight.
6.
A pigment according to claim 1, whereby the iron oxide is a non-magnetic, black iron oxide.
7.
In a paint, plastic or cosmetic containing a pigment, the improvement wherein the pigment is the pigment of claim 1.
8.
A process for the preparation of non platelet-shaped pigments comprising: a.
providing a suspension of silica, zirconium dioxide and/or titanium dioxide substrate particles in water; b.
preparing a solution of aqueous iron salts which may optionally contain other metal salts; and c.
metering said solution into said suspension while the pH of the suspension is maintained at a level to effect the hydrolysis of the iron and said optional metal salts of the solution by simultaneous addition of a base, thereby coating said substrate particles with iron oxide such that the iron oxide content is at least 350% by weight relative to the weight of the substrate particles.
9.
A pigment according to claim 1, wherein the substrate is spherical.
10.
A pigment according to claim 1, wherein the substrate has an irregular 3-dimensional shape.
11.
A pigment according to claim 1, wherein the substrate is a monodisperse particle.
12.
A pigment according to claim 1, wherein the substrate has a particle diameter of about 0.
08 to 0.
9 .
mu.
m.
13.
A pigment according to claim 1, wherein the substrate has a particle diameter of about 0
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Manufacturing Materials 
