Photochromic flesh-colored pigment and process for producing the same
AssigneeShiseido Company, Ltd.
InventorsKazuhisa Ohno, Shigenori Kumagai, Fukuji Suzuki, Nobuhisa Tsujita
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Abstract
A photochromic flesh-colored pigment comprising not less than 90 wt % of anatase type titanium oxide having photochromism and a process for producing a photochromic flesh-colored pigment comprising the steps of adding iron hydroxide (FeOOH) to a composition containing untreated anatase type titanium oxide as the main ingredient, and calcining the mixture at 750.degree. to 850.degree. C. It is possible to exhibit a flesh color with a single color with a single pigment and it is also possible to change the color depending upon the intensity of light.
Claims10
A photochromic flesh-colored pigment comprising not less than 90 wt % of anatase titanium oxide having photochromism.
A process for producing a photochromic flesh-colored pigment comprising the steps of adding iron hydroxide (FeOOH) to a composition containing not less than 90% by weight of untreated anatase titanium oxide as the main ingredient and calcining the mixture at 750.degree. C. to 850.degree. C.
A process for producing a photochromic flesh-colored pigment comprising the steps of adding in a dry or wet process 0.05-5.0 wt % of iron hydroxide based on an amount of titanium oxide in a titanium dioxide-coated composite to said titanium dioxide-coated composite which contains not less than 90% by weight of untreated anatase titanium oxide as the main ingredient;
- and calcining the mixture at 750.degree.-850.degree. C.
A process for producing a photochromic flesh-colored pigment comprising the steps of:
- producing untreated anatase titanium dioxide-coated composite by the hydrolysis of titanyl sulfate in the presence of 0.05 to 5.0 wt % of iron oxide, and calcining said composite at 750.degree. to 850.degree. C.
A process for producing a photochromic flesh-colored pigment comprising the steps of:
- adding in a dry or wet process 0.05 to 5.0 wt % of iron hydroxide based on the amount of titanium dioxide in a titanium dioxide-coated composite comprising titanium-mica and titanium-talc to said titanium dioxide-coated composite containing not less than 90% untreated anatase titanium oxide as the main ingredient;
- and calcining the mixture at 750 to 850 C.
Dependencies are inferred from the claim text.