Drug – bio-affecting and body treating compositions – Live skin colorant containing
Reexamination Certificate
2000-06-20
2002-08-06
Dees, Jose′ G. (Department: 1616)
Drug, bio-affecting and body treating compositions
Live skin colorant containing
C424S401000
Reexamination Certificate
active
06428774
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a nonaqueous liquid cosmetic, specifically to a nonaqueous hydrophobic liquid make-up cosmetic having a viscosity of 100,000 mPa·s or less at 25° C., usually called a liquid cosmetic, wherein sundry bacteria are inhibited from propagating when an aqueous contaminant such as sweat and saliva is involved.
2. Description of the Related Art
In using a make-up liquid cosmetic such as liquid rouge and liquid eye shadow filled in a container for a liquid coating cosmetic equipped with an applicator of a brush or sponge type, sweat and saliva stick to fibers of a brush part in the applicator in a certain case. Usually, a preservative and a fungicide are contained in these liquid cosmetics to inhibit sundry bacteria mixed therein from propagating. However, if this liquid cosmetic is a nonaqueous hydrophobic liquid cosmetic, droplets of sweat and saliva mixed therein are not miscible with the liquid content and are involved as they are in liquid vehicles in a certain case.
The involved droplets cause putrefaction by microorganisms as time passes, and as a result, such a problem that a putrefactive odor is generated from the tip of a brush has been brought about in many cases. If a liquid cosmetic is a nonaqueous hydrophobic cosmetic, Parabens are effective as a substantially usable preservative from the viewpoints of safety to a human body, irritation to the skin and the mucosa and easiness (stability in a dispersion system) in blending with the vehicle. However, Parabens are lipophilic, and therefore when it is blended with a nonaqueous hydrophobic cosmetic, it is dissolved into the vehicle, so that it is not distributed into droplets comprising water as a main component which is secondarily involved later. Accordingly, a preservative system comprising primarily only Parabens has not been able to prevent a foul odor at a brush part caused by the droplets which was involved during use and degenerated with the passage of time.
A cosmetic filled in a container for a liquid coating cosmetic equipped with an applicator of a brush or sponge type has to be liquid, and the liquid is liable to introduce droplets of sweat and saliva. Further, the water introduced thereinto is not evaporated and is liable to bring about putrefaction by microorganisms.
An object of the present invention is to provide a nonaqueous hydrophobic liquid make-up cosmetic having a viscosity of 100,000 mPa·s at 25° C., usually called a liquid cosmetic, wherein the cosmetic inhibits putrefaction by microorganisms even if droplets of sweat and saliva are introduced and is free of a bittersweet taste felt unpleasant by a user. Further, an object of the present invention is to provide a nonaqueous hydrophobic liquid make-up cosmetic which can maintain a stable dispersing state without causing separation of the cosmetic after storage over a long period of time, particularly even in a dispersion system using an inorganic pigment having a large specific gravity.
SUMMARY OF THE INVENTION
Various investigations continued by the present inventors in order to achieve the subjects described above have resulted in finding that microbial putrefaction can be inhibited to a large extent by using two kinds of solvents in a liquid cosmetic and distributing (dissolving) most of a preservative in a water-soluble solvent so that the preservative is dispersed homogeneously in a principal non-water soluble solvent, and thus the present invention has been completed.
That is, the present invention relates to a nonaqueous liquid cosmetic comprising a non-water soluble principal solvent A, a water soluble auxiliary solvent B, a preservative C and a coloring component D as essential components, wherein the principal solvent A is not substantially miscible with the auxiliary solvent B, and the auxiliary solvent B is dispersed in the principal solvent A; and the preservative C is distributed (dissolved) in the dispersed auxiliary solvent B.
In the invention described above, the distribution factors (solubility) of the preservative C into the principal solvent. A and the auxiliary solvent B reside preferably in a relation of A≦B in order to distribute the preservative C to the auxiliary solvent B.
In the present invention, it is preferred in terms of the efficacy of preventing putrefaction and a foul odor caused by secondary contamination and a stability with the passage of time that a blending ratio of the auxiliary solvent B/the preservative C is 1.5 to 35 in terms of a weight ratio and that a blending amount of the auxiliary solvent B falls in a range of 0.5 to 10 wt % based on the liquid cosmetic.
Further, it is preferred in the invention described above that fine droplets of the solvent B dissolving the preservative C, a coloring component and other make-up components are homogeneously dispersed in the principal solvent A and that water is not substantially contained therein.
According to the present invention, even if droplets of sweat and saliva are introduced into the cosmetic, the water (sweat and saliva) is involved in the water-soluble auxiliary solvent B, which is homogeneously dispersed, and hence the preservative present in the solvent B displays a preservative effect on the water. This inhibits microbial putrefaction caused by the water (sweat and saliva) mixed therein. Further, a stable dispersion system can be maintained even in storage over a long period of time without causing separation of the cosmetic, and in particular, even a dispersion system in which an inorganic pigment having a large specific gravity is used has a high dispersion stability.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The constitution and an embodiment of the present invention shall be explained below in detail.
The present invention relates to a nonaqueous hydrophobic liquid cosmetic having a viscosity of 100,000 mPa·s at 25° C., called a make-up liquid cosmetic such as liquid rouge and liquid eye shadow.
The liquid cosmetic of the present invention may be blended so that it contains various components, however it contains a non-water soluble principal solvent A, a water soluble auxiliary solvent B, a preservative C and a coloring component D as the essential components, which shall be explained below.
First of all, the principal solvent A is a non-water soluble solvent which does not substantially exert an adverse effect on a human body and is selected from silicone oils which have so far been used for cosmetics. For example, diorganopolysiloxanes and cyclic siloxanes having a viscosity of a low viscosity extending to a high viscosity can be used. In particular, most preferred is at least one selected from octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, tetramethyltetraphenylcyclotetrasiloxane and the like, which are the cyclic siloxanes. This principal solvent A is used in a range of 5 to 80 wt %, preferably 10 to 50 wt % in the liquid cosmetic.
Next, the auxiliary solvent B is selected from polyhydric alcohol base compounds which are basically water-soluble and are not miscible (mutually dissolved) with the principal solvent A described above and which do not exert an adverse effect on a human body.
It is preferably at least one glycol selected from, for example, propylene glycol, 1,3-butylene glycol, dipropylene glycol and the like.
This auxiliary solvent B is used in a range of 11 wt % or less, preferably 0.5 to 10 wt % and more preferably 2 to 10 wt % in the liquid cosmetic. If it is too small, practical effects such as prevention of putrefaction and a foul odor are reduced, and if it is too large, it is not preferred in terms of taste evaluation and stability with the passage of time. A blending ratio of the principal solvent A/the auxiliary solvent B falls preferably in a range of 3 to 20 in terms of a weight ratio.
Paraben which has so far been used for cosmetics is preferred as the preservative C.
Preferred is at least one selected from, for example, methyl para-hydroxybenzoate, ethyl para-hydroxybenzoate, propyl para-hydroxybenzoate, butyl p
Darby & Darby
Dees Jose′ G.
George Konata M.
Mitsubishi Pencil Kabushiki Kaisha
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