Compositions: coating or plastic – Materials or ingredients – Pigment – filler – or aggregate compositions – e.g. – stone,...
Reexamination Certificate
2001-02-08
2002-07-09
Marcantoni, Paul (Department: 1755)
Compositions: coating or plastic
Materials or ingredients
Pigment, filler, or aggregate compositions, e.g., stone,...
C428S403000, C424S078030, C514S844000
Reexamination Certificate
active
06416573
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a novel composite pigment, which comprises an aluminum hydroxide-clay mineral composite particle; in which said aluminum hydroxide of a specific structure adheres to the particle surface of said clay mineral. Furthermore, this invention relates to a composite pigment, that remarkably hides the troubled morphology of the skin, such as wrinkles, pore openings, hard texture of the skin, and at the same time, remarkably hides the troubled color tone of the skin, such as blemishes, freckles, and acne traces and the like, and compared to conventional products, has a smoother finish on the skin and has less color drabness, and is much more transparent and therefore makes the skin look brighter, when used for the cosmetics, and also relates to cosmetics, which contain the same.
2. Description of the Related Art
Until now, there were many types of make-up formulations that contained high concentrations of titanium dioxide, which had high covering power, because of its opaqueness, in order to hide the troubled color tone of the skin, such as blemishes, freckles, and acne traces on the skin. These types of make-ups have some effect on hiding the troubled color tone of the skin, but usually have a completely reversed effect on hiding the troubled morphology of the skin. Generally, it is thought that by hiding the troubled color tone of the skin, the troubled morphology of the skin is also hidden. However, there are overwhelmingly many cases, where when only covering power is used, the troubled morphology is not only unhidden, but actually makes the troubled morphology stand out. From such facts, research has begun on ways to hide the troubled skin morphology, aside from using high covering power.
In the Japanese Patent Kokai Publication JP-A-61-69708, extender pigments for cosmetics, such as talc, kaolin, mica, sericite and the like surface treated with acrylic resin has been proposed, but when the acrylic resin surface treatment on the extender pigment increased beyond 5%, the feeling worsened, and a discomfort (pain) occurred on the skin, which made its use, at levels that show some effect, very difficult. When used in large quantities in dry powder formulations, troubled skin morphology is hidden to some extent, however, this composite pigment has a defect of blurring the contour of the face, because the powder scatters diffused light from its surface, making the face look larger. Also, composites of this type have a defect of making blemishes stand out. In addition, when it gets wet by sebum and perspiration secreted by the skin, it becomes completely transparent, thereby negating the hiding effect of the troubled skin morphology.
In the Japanese Patent Kokai Publication JP-A-7-2619, mica powder, which has excellent feel and pressability (formability), and can substitute for sericite with small luster suitable for cosmetics, is proposed. However, the reflection pattern of light of this mica powder is greatly different from that of the skin surface, and therefore does not create any skin-like texture, producing a makeup that does not simulate the skin. In addition, a reflection pattern is produced, which is similar to a specular reflection, creating an unnatural gloss, and makes wrinkles stand out.
In the Japanese Patent Kokai Publication JP-A-59-36160, talc, which has the talc surface covered with metal hydroxide, has been proposed. It is shown in this document that, the talc particle has improved hydrophobicity on its surface, and has good dispersive properties as an extender pigment, and when different types of water-soluble metal compounds are used, colored talc pigment with colored pigment properties, such as black, red, yellow, blue, orange, etc., with good dispersive properties may be processed. However, the following have not completely been shown: The hiding effect of troubled morphology of the skin, and hiding effect of the troubled color tone, smooth feeling and small color drabness, high transparency, and an effect of making the skin look brighter. And, by viewing the practical example of this document, the results of the hiding effect of the troubled morphology of the skin and troubled skin tone, show data that is not acceptable in terms of our purpose of this invention.
In the Japanese Patent Kokai Publication JP-A-61-56258, talc and sintered talc that is uniformly and perfectly covered on all surfaces of the talc particle, by a metal hydroxide and/or a composition which consists only of a metal oxide, can be processed to any desired color, and has excellent pigment properties, such as dispersiveness, is proposed. However, the following have not completely been shown: The hiding effect of troubled morphology of the skin and troubled color tone, and also smooth feeling and small color drabness, high transparency, and an effect of making the skin look brighter. And, by viewing the practical example of this document, the results of the hiding effect of the troubled morphology of the skin and troubled skin tone, show data that is not acceptable in terms of our purpose of this invention as was shown above.
In addition, in Japanese Patent Kokai Publication JP-A-9-20609, a surface treated powder (the composite pigment) with the covered structure of the inorganic metal hydroxide, which covers the surface of a clay mineral contained in cosmetics, given by the following (A), (B), (C) or (D), is proposed.
(A) A complex, which has a honeycomb structure, on top of a film of inorganic metal hydroxide that covers the surface of a clay mineral, formed with ultrafine particles (average particle size of 50~250 Å).
(B) A complex, which has a film of inorganic metal hydroxide that covers the surface of a clay mineral, formed with ultrafine particles (average particle size of 50~250 Å).
(C) A complex, which has a film of inorganic metal hydroxide that covers the surface of a clay mineral, formed with ultrafine particles (average particle size of 50~250 Å), and a honeycomb structure, intermingled within a film surface.
(D) A complex, which has particles of average particle size 0.08~0.8 &mgr;m, embedded within the film of inorganic metal hydroxide of ultrafine particles with an average particle size of 50~250 Å, that covers the surface of the clay mineral.
When this composite pigment, has its honeycomb structure on its external layer, the said structure makes the pigment have good adhesion to the skin, because of its ability to entangle with the corrugated surface of the skin, but the honeycomb structure will inversely destroy the good feeling, which is generally required, of cosmetics. Also, a complex, which has its external layer similarly covered with ultrafine particles, will have a heavy drag and bad extension on the skin, generally associated with ultrafine particles themselves, and when used in quantities of over 5 weight % in cosmetics, will drastically put a burden on the skin, and thereby make it difficult to use in cosmetics in sufficient large concentrations.
Over the past several years, sericite with good qualities have become exhausted, and there seems to be a strong demand for a material that can substitute for sericite. There has been some material development on holding the luster of mica, by applying friction to the surface of mica and making the surface corrugated, but this in turn makes the mica have a heavy drag on the skin, and the stability of the degree of luster, is very wide and its control becomes very difficult. In addition, when the mica surface is wetted by sebum and perspiration that is secreted by the skin over time, the grayish-brown color that is representative of mica becomes emphasized, and the desired makeup effect cannot be obtained. Also, when the sebum and perspiration that the skin secretes in excess covers and overlays the said ultrafine corrugated surface, the gloss becomes emphasized, and defects such as wrinkles stand out.
Makeups generally require different cosmetic effective luster, in order to correspond to various changes in texture. F
Horino Masaakira
Nishizawa Miwa
Armstrong Westerman & Hattori, LLP
Marcantoni Paul
Miyoshi Kasei, Inc.
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