Ceramic pigments
First Claim
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1. A pearlescent pigment, comprising:
- ceramic flakes having a single coating comprising a metal oxide, said coating having a refractive index that is at least 0.5 higher than that of said ceramic flakes, wherein said ceramic flakes has a composition that includes;
50-70 wt % SiO2;
15-25 wt % CaO;
10-20 wt % MgO; and
0-1 wt % ZrO2.
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Abstract
A pearlescent pigment includes a ceramic flake coated with a metal oxide. The metal oxide is, preferably, an oxide of titanium, iron, tin, chromium1, zirconium or a combination thereof, and the refractive index of the metal oxide coating is preferably at least 0.5 higher than that of the ceramic flake. The pearlescent pigment may be included in a coating applied to a metallic or plastic surface to give the surface a lustrous or pearlescent optical effect.
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Citations
14 Claims
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1. A pearlescent pigment, comprising:
ceramic flakes having a single coating comprising a metal oxide, said coating having a refractive index that is at least 0.5 higher than that of said ceramic flakes, wherein said ceramic flakes has a composition that includes; 50-70 wt % SiO2; 15-25 wt % CaO; 10-20 wt % MgO; and 0-1 wt % ZrO2. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for providing a lustrous or pearlescent optical effect to a metallic surface or a plastic surface, comprising the step of:
coating a metal surface or a plastic surface with a pigment having ceramic flakes that include a single coating comprising a metal oxide, said coating having a refractive index that is at least 0.5 higher than that of said ceramic flakes, wherein said ceramic flakes has a composition that includes; 50-70 wt % SiO2; 15-25 wt % CaO; 10-20 wt % MgO; and 0-1 wt % ZrO2. - View Dependent Claims (9, 10, 11, 12, 13, 14)
Specification