Loading patent…
AssigneesTopy Industries, Limited, Shiseido Company, Ltd.
InventorsYuji Takao, Akitsugu Ando, Tetsusi Kosugi, Fukuji Suzuki, Kazuhisa Ohno, Katsuki Ogawa
Estimating the term…
A composite synthetic mica powder having an excellent ultraviolet ray screening effect, the composite synthetic mica powder comprising a fine particle layer (B) containing one or more types of elements selected from the group of Te, Bi, Pb, Ce, Fe, Mo, Nb, W, Sb, Sn, V, Mn, Ni, Co, Zn and Ti is formed on the surface of scale-like mica particles (A). The covering ratio of particles (A) by particles (B) is in the range of 0.5 to 1; the ratio of particle size of the particles (B) to plane direction diameter of the particles (A) is 0.1 or less; and particle size of the particles (A) is 1 to 100 .mu.m. Also, a red synthetic mica which develops light-resistant red color closer to the color of human skin and ultraviolet rays, a method for manufacturing the same, and an ultraviolet ray screening agent which contains the synthetic mica. The synthetic mica is expressed by the following formula (I): X.sub.1/3.about.1 Y.sub.2.about.3 (Z.sub.4 O.sub.10)F.sub.2.times.0.75.about.2.times.0.99 (I) where X represents one or more ions selected from the group of Na, K, Li, Ca, Rb and Sr; Y represents one or more ions selected from the group of Mg, Fe, Ni, Mn, Al, Li, Co, Ti and Zn; Z represents one or more ions selected from the group of Al, Si, Ge, Fe, B, Co and Ti; and at least one of Y and Z represents an iron ion; and the molar number of iron contained in the synthetic mica is 0.01 to 3 mols.
Composite mica powder, comprising mica particles (A) with mica fine particle layer (B) formed on the surface thereof, said mica fine particle layer contains one or more types of elements selected from the group consisting of Te, Bi, Pb, Ce, Fe, Mo, Nb, W, Sb, Sn, V, Mn, Ni, Co, Zn and Ti, whereby:
An ultraviolet ray screening agent containing composite mica powder, which comprises mica particles (A) with mica fine particle layer (B) formed on the surface there, said mica fine particle layer contains one or more types of elements selected from the group consisting of Te, Bi, Pb, Ce, Fe, Mo, Nb, W, Sb, Sn, V, Mn, Ni, Co, Zn and Ti, whereby:
A red synthetic mica, expressed by the following formula (I):
An ultraviolet ray screening agent, containing red synthetic mica, which is expressed by the following formula (I):
Dependencies are inferred from the claim text.