Drug – bio-affecting and body treating compositions – Face or body powders for grooming – adorning – or absorbing
Reexamination Certificate
2000-09-29
2003-05-13
Travers, Russell (Department: 1617)
Drug, bio-affecting and body treating compositions
Face or body powders for grooming, adorning, or absorbing
C424S600000, C106S241000, C106S286100, C106S286800, C106S400000, C525S902000, C525S934000
Reexamination Certificate
active
06562323
ABSTRACT:
TECHNICAL FIELD
The present invention relates to composite powder prepared by coating a ramentaceous substrate such as mica with two or more types of coloring layers. Moreover the present invention relates to cosmetic and paint with the composite powder blended therein.
BACKGROUND ART
Conventionally ramentaceous substrates such as mica, talc, a and sericite have been blended in cosmetics such as powder foundation or as pearl pigment in various types of paint such as paint for cars. The effect obtained when the ramentaceous powder is blended in cosmetic includes , but not limited to, improvement in the adaptability of the cosmetic to be spread on human skin, improvement of the color pigment of the dispersibility on human skin, and further improvement in the adhesiveness to human skin, and these characteristics are indispensable for make-up cosmetics.
For instance, mica covered with a titanium oxide layer having the certain thickness is called pearl pigment and is used in cosmetic and paint. This pearl pigment varies its color tone at a certain reflection angle against an incidence angle of light according to the thickness of the layer because of optical interference, and has intense luster. The more intense the luster, the more the brightness changes according to a viewing angle, and the characteristic is called flip-flop characteristic.
Colors generated because of the optical interference have the higher brightness as compared to those of general color pigments such as iron oxide red and ultramarine blue, but the tinting strength is very weak. As a method of improving the tinting strength, there has been proposed to cover the titanium oxide layer described above with a metal oxide which absorbs visible light having a wavelength in a certain range such as iron oxide (Refer to Japanese Patent Publication No. 7674/1983). With this method, however, although some particular colors are emphasized and the change in brightness caused by the luster can be made larger, but the effect that the color hue largely changes according to a viewing angle is rather weak.
In some cases, at first mica is covered with ferric oxide and then titanium oxide layer having the certain thickness is formed thereon, but also in this case the effect that the color tone largely changes according to a viewing angle is rather small (Refer to Japanese Patent Laid-Open Publication No. 11161/1995).
Japanese Patent Laid-Open Publication No. 101377/1989 proposes an invention relating to golden color luster pigment which is color and luster pigment containing mica or mica with metal oxide deposited thereon as a substrate and a metal oxide layer containing both titanium and iron coating the substrate, and also in which the metal oxide layer contains pseudo-blockite as an essential component. In this invention, it is described that the metal oxide layer containing, in addition to titanium and iron, pseudo-blockite as an essential component is used for coating the substrate to improve the stability against heat and chemical compounds, and the metal layer is not used for changing the color tone according to a viewing angle.
Japanese Patent laid-Open Publication No. 209024/1996 proposes luster pigment in which a flake-like substrate is sequentially coated with an achoromatic layer having the refractive index of 1.8 or below, a coating layer having the refractive index of 2.0 or more with selective absorbance, and an achromatic or selectively absorptive layer, if necessary, in this order, and there are enlisted aluminum and alloy thereof as the metal substrate; silica, aluminum oxide, and others as the material with the refractive index of 1.8 or below used to form the first layer; and iron oxide, chromium oxide, and titanium oxide (TiO
2
reduced with ammonia) as the material having the refractive index of 2.0 or more with selective absorbance. In this invention, the effect that the tone changes according to a viewing angle is pointed out, but in this luster pigment the metal substrate is used to intensify the tone change, and it is described in the publication that the pigment has intense metallic luster. Therefore, with the pigment, it is difficult to obtain cosmetics or paints having modest luster and natural appearance, and its concealing capability is disadvantageously too high.
DISCLOSURE OF THE INVENTION
An object of the present invention is to provide composite powder with the color tone changing according to a viewing angle and insuring natural appearance without excessive luster.
Another object of the present invention is to provide cosmetics and paints capable of emphasizing a face or other solid structures not with change in the brightness, but with change in the hue.
The present invention provides composite powder prepared by coating a ramentaceous substrate with at least two color layers characterized in that a difference between the maximum value and the minimum value of the ab hue angle h
ab
(h
MAX
−h
MIN
) as defined in the recommendation on uniform color spaces by CIE (Commission Internationale De L'eclairage) is in the range from 10° to 180° when this value exceeds 180°, the value of 360°−(h
MAX
−h
MIN
) is in the range from 10° to 180°), and also that a ratio of the maximum value and the minimum value of the brightness L as defined in the recommendation is in the range from 1.0 to 2.0.
It is preferable to provide a transmission light dispersion layer with the refractive index of 1.3 to 1.8 between the color layers.
Also it is preferable to coat a surface of the composite powder with a reflection and dispersion layer with the refractive index of 1.3 to 1.8 and also having some irregularity on the surface.
Cosmetics and paints according to the present invention have any of the composite powders described above blended therein.
BEST MODE FOR CARRYING OUT THE INVENTION
Preferred embodiments of the present invention are described below.
(1) Composite Powder
A ramentaceous substrate is used for the composite powder according to the present invention. The ramentaceous substrate includes, but not limited to, natural minerals such as mica, talc, and sericite; and inorganic oxides such as syntheticmica, synthetic sericite, plate-like silica, plate-like aluminum oxide, and plate-like titanium oxide.
An average particle diameter of the ramentaceous substrate is preferably in the range from about 1 to about 100 &mgr;m, and more preferably in the range from 5 to 30 &mgr;m. When an average particle diameter of the ramentaceous substrate is less than 1 &mgr;m, and an average particle diameter of the obtained composite powder is less than 1 &mgr;m, change of hue hardly occurs, and on the contrary, when the average particle diameter of the ramentaceous substrate is more than 100 &mgr;m, and also the average diameter of obtained composite powder exceeds 100 &mgr;m, the luster is so intense that the appearance is unpleasant. The average particle diameter of the ramentaceous substrate as defined herein indicates an average value of the ramentaceous flat surfaces, which is obtained by 100 pieces of ramentaceous substrates with a scan type of electronic microscope for their maximum lengths and calculating the average value. Thickness of the ramentaceous substrate is preferably in the range from 0.05 to 1 &mgr;m.
As the color layer used for coating the substrate, known inorganic pigments, organic pigments, inorganic and organic composite pigments may be used, and in addition, coloring matters or a color layer colored with any coloring matter may be used.
More specifically inorganic pigments such as ferric oxide (&agr;-Fe
2
O
3
, &ggr;-Fe
2
O
3
), oxi-iron hydroxide (FeO(OH)), ferric hydroxide (Fe
2
(OH)
6
), ferrous oxide (FeO), triiron tetraoxide (Fe
3
O
4
) titanium oxide containing iron oxide, carbon black, ultramarine blue, iron blue, titanium black, chromium hydroxide, lithium cobalt titanate, manganese violet; organic coloring materials including various types of tar coloring matters, natural coloring matters, and other synthetic coloring matters; and inorganic or organic material layers color
Miyazaki Takumi
Tanaka Hirokazu
Catalysts & Chemicals Industries Co. Ltd.
Kanesaka & Takeuchi
Travers Russell
Wells Lauren Q
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