Drug – bio-affecting and body treating compositions – Live hair or scalp treating compositions – Hair coloring
Reexamination Certificate
1998-06-19
2001-02-20
Dudash, Diana (Department: 1619)
Drug, bio-affecting and body treating compositions
Live hair or scalp treating compositions
Hair coloring
C424S070110, C424S070160, C514S951000
Reexamination Certificate
active
06190648
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a hair cosmetic that can impart a temporary change in the color tone of hair. More particularly, it relates to a hair cosmetic that contains titanium-dioxide-coated mica but can change the color tone of hair into a color tone with a natural impression.
2. Description of the Related Art
As hair cosmetics for imparting changes in the color tone of hair, permanent hair dyes (hair colors, bleach and colors), hair bleaches (bleaches), semi-permanent hair dyes (hair manicures) and temporary hair dyes are conventionally used from the viewpoint of retention of color tones changed.
Of these, the use of permanent hair dyes, semi-permanent hair dyes or hair bleaches tends to cause problems such as hair damage and skin dyeing. Moreover, there are problems that these can be handled with difficulty for users who want to treat their own hair by themselves and also that, if color tones have been changed into tones not originally intended, it is actually impossible to readily restore the original color.
On the other hand, the use of temporary hair dyes ay cause neither hair damage nor skin dyeing. Moreover, they have an advantage that the original color tone can be restored by shampooing the colored hair to easily wash off the temporary hair dye adhering to the hair.
Recently, as a kind of such temporary hair dyes, a hair cosmetic mixed with titanium-dioxide-coated mica is proposed (see Japanese Patent Applications Laid-open No. 58-124713, No. 62-4219 and No. 1-121208), which mica has been used from old times as a pearlescent pigment in cosmetics and hair-treating materials and has a good hiding power. When hair cosmetics containing such titanium-dioxide-coated mica are used in hair, the hair can be colored and then the hair colored can be readily restored to the original color tone of hair by shampooing.
As a different kind of such temporary hair dyes, a hair color foam aerosol is proposed which is obtained by filling an aerosol pressure container with a) a base solution obtained by mixing, in a mixed solvent of ethanol and water, such titanium-dioxide-coated mica, a carboxyvinyl polymer used as a thickening agent capable of highly effectively preventing the titanium-dioxide-coated mica from settling and an anionic resin used as a binder for fixing the titanium-dioxide-coated mica onto the hair, and b) an aerosol propellant added to the base solution (Japanese Patent Application Laid-open No. 62-255414).
However, conventional hair cosmetics containing the titanium-dioxide-coated mica have had a problem of a difficulty in their daily use because they not only color the hair but also impart a glittering, strongly pearly impression to the hair.
In particular, the hair color foam aerosol disclosed in Japanese Patent Application Laid-open No. 62-255414, has problems that the titanium-dioxide-coated mica, though having a good re-dispersibility in the base solution, tends to agglomerate on the hair to cause flaking and also that the color formation attributable to the titanium-dioxide-coated mica is too insufficient to well change the color of hair. Moreover, it may undesirably impart a glittering impression with an unnaturally strongly pearly appearance.
SUMMARY OF THE INVENTION
The present invention was made in order to solve the above problems the prior art has had. Accordingly, a first object of the present invention is to make it possible to color hair in a natural impression when hair cosmetics containing titanium-dioxide-coated mica are applied to the hair. Also, a second object of the present invention is to make it possible to realize a good dispersibility for such hair cosmetics.
The present inventors took note of the fact that the relationship between particle diameter of titanium-dioxide-coated mica and the glittering impression imparted to hair has not been taken into consideration at all in the conventional hair cosmetics containing the titanium-dioxide-coated mica, and have reached a finding that the color tone of hair can be changed into a natural tone without imparting the glittering impression to hair, when titanium-dioxide-coated mica with a relatively large particle diameter is held in a smaller proportion in the total volume of titanium-dioxide-coated mica used. On the basis of such a finding, they have accomplished a hair cosmetic according to a first embodiment of the present invention that can achieve the first object.
More specifically, as the first embodiment, the present invention provides a hair cosmetic containing titanium-dioxide-coated mica, wherein titanium-dioxide-coated mica with particle diameters of 20 &mgr;m or larger is in a proportion not more than 10% by volume in the total volume of the titanium-dioxide-coated mica.
The present inventors also made extensive studies in order to achieve the above second object. As a result, they have reached, in addition to the above finding, the following findings (i) and (ii):
(i) that, when titanium-dioxide-coated mica with a relatively small particle diameter is mixed in hair cosmetics, the hair cosmetics tend to agglomerate, have an insufficient re-dispersibility, tend to cause caking and may insufficiently form colors on the hair; and
(ii) that, even if titanium-dioxide-coated mica with a relatively small particle diameter is used, the titanium-dioxide-coated mica can be well re-dispersed when a carboxyvinyl polymer and an amphoteric macromolecule are used in combination in a specified proportion, and the color tone of hair can be changed into a natural tone without imparting any glittering impression to the hair. On the basis of such findings, they have accomplished a hair cosmetic according to a second embodiment of the present invention.
More specifically, as the second embodiment, the present invention provides a hair cosmetic in which, in addition to the titanium-dioxide-coated mica with particle diameters of 20 &mgr;m or larger contained in a proportion not more than 10% by volume, a carboxyvinyl polymer and an amphoteric macromolecule are used in combination.
DETAILED DESCRIPTION OF THE INVENTION
The hair cosmetic according to the first embodiment of the present invention contains titanium-dioxide-coated mica. The reason why the titanium-dioxide-coated mica is used is as follows:
The titanium-dioxide-coated mica commonly refers to those comprising a laminar natural mica (white mica, black mica or gold mica) of from about several &mgr;m to about hundreds of &mgr;m in maximum size and from about 0.05 to about 1 &mgr;m in thickness or a synthetic mica of from about 0.1 &mgr;m to about 50 &mgr;m in maximum size and from about 0.05 to about 50 &mgr;m in thickness, the laminar surfaces of which are coated with titanium dioxide to have titanium dioxide layers. Such titanium-dioxide-coated mica itself has a white appearance, and forms an interference color of yellow, red, blue or green depending on the thickness of titanium dioxide layers. Thus, the mixing of the titanium-dioxide-coated mica in hair cosmetics, when the hair cosmetics are applied to black hair, brings about very vivid color formation by contrast with black background of the hair to which the titanium-dioxide-coated mica has adhered.
Incidentally, the particle diameter referred to on the titanium-dioxide-coated mica is expressed variously by maximum size measured with a microscope or average value determined by a light-scattering method. The particle diameter of titanium-dioxide-coated mica in the present invention is meant by a value obtained by the Coulter method. According to the Coulter method, particle size distribution can be measured easily using, e.g., Coulter Multicizer 020487 (manufactured by Coulter Electronics Co; with an aperture of 100 &mgr;m diameter). To make calibration, a monodisperse silica latex may be used. In this measurement, in order to make measurement without causing the aggregation of titanium-dioxide-coated mica particles, the measurement must be made after the particles is diluted with a surface-active agent solution (e.g., an aqueous 0.03% polyoxyet
Asami Michiko
Hirano Aya
Itou Takashi
Itou Yoshiaki
Kouzu Emiko
Berman Alysia
Dudash Diana
Kao Corporation
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
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