red synthetic mica and those containing abschirmendes resources against ultraviolet radiation

摘要

The object of the present invention is to provide composite synthetic mica powder having excellent ultraviolet ray screening effect. The composite synthetic mica powder of the present invention is characterized in that a mica fine particle layer (B) containing one or more types of elements selected from a 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), whereby: covering ratio of said particles (A) by said particles (B) is lower than or equal to 1 and higher than or equal to 0.5; and ratio of particle size of said particles (B) to plane direction diameter of said particles (A) is lower than or equal to 0.1, and particle size of said particles (A) is 1 to 100 mu m. Another object of the present invention is to provide red synthetic mica, which develops light-resistant red color closer to color of human skin and ultraviolet ray, and also to provide a method for manufacturing the same and an ultraviolet ray screening agent containing said synthetic mica. The synthetic mica of the present invention is characterized in that, it is expressed by the following formula (I): X1/3 SIMILAR 1 Y2 SIMILAR 3 (Z4 O10) F2x0.75 SIMILAR 2x0.99 (I (where X represents one or more types of ions selected from a group of Na, K, Li, Ca, Rb and Sr, Y represents one or more types of ions selected from a group of Mg, Fe, Ni, Mn, Al, Li, Co, Ti and Zn, Z represents one or more types of ions selected from a group of Al, Si, Ge, Fe, B, Co and Ti, and at least one of Y and Z represents an iron ion), molar number of iron contained in said synthetic mica is 0.01 to 3 mols, and, when said synthetic mica is measured by powder cell method, its color is given by L*=55 to 75, a*=5 to 20, and b*=5 to 20 by the CIE 1976 (L*a*b*) space. IMAGE