Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Cosmetic – antiperspirant – dentifrice
Reexamination Certificate
1998-07-10
2002-02-26
Bawa, Raj (Department: 1619)
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Cosmetic, antiperspirant, dentifrice
C424S078020, C514S058000
Reexamination Certificate
active
06350459
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a solubilized cosmetic composition, more particularly it relates to a solubilized cosmetic composition which is superior in long term stability over time, is not accompanied by a sticky feeling in use, and is superior in clarity, without substantially containing a surfactant.
BACKGROUND ART
In the past, wide use has been made of cosmetic compositions which solubilize ingredients difficult to be dissolved in water, for example, perfumes, oil-soluble medicines, oils, and the like in the form of a cosmetic water, etc. It had been considered essential to formulate a surfactant into cosmetic compositions of a type solubilizing ingredients difficult to be dissolved in water so as to ensure stability over time of the cosmetics.
In recent years, however, greater safety has been expected even in cosmetic composition. From this viewpoint, the inclusion of surfactants in cosmetic compositions has been considered a problem in some cases. Therefore, it has been proposed to obtain a solubilized cosmetic composition, without substantially using a surfactant (for example, see JP-A-2-196709).
However, such a solubilized cosmetic substantially not containing a surfactant, is not sufficiently satisfactory in long term stability over time of the solubilized state. Further, in terms of usability, there had been a tendency for an accompanying sticky feeling of use.
DISCLOSURE OF INVENTION
Accordingly, an object of the present invention is to provide a solubilized cosmetic composition, which is superior in long term stability over time, and is not accompanied by a sticky feeling in use, substantially without using a surfactant.
In accordance with the present invention, there is provided a solubilized cosmetic composition containing an ingredient which is difficult to be dissolved in water, an alkyl-modified carboxyvinyl polymer and a hydroxyalkylated cyclodextrin so as to solubilize the ingredient difficult to be dissolved in water.
BEST MODE FOR CARRYING OUT THE INVENTION
The present inventors engaged in repeated studies to solve the above-mentioned problems and found that by formulating an alkyl-modified carboxyvinyl polymer and hydroxyalkylated cyclodextrin in a cosmetic composition containing an ingredient difficult to be dissolved in water, the solubilized state was stabilized over a long period of time and the feeling in use was improved and, further, found that by formulating in a specific ratio of the ingredients, it was possible to obtain a solubilized cosmetic composition having a particularly superior clarity, whereby the present invention has been completed.
Note that, in this specification, unless otherwise indicated, “an ingredient which is difficult to be dissolved in water” will be referred to as “an ingredient difficult to be dissolved in water”. Further, a “cosmetic composition obtained by solubilizing an ingredient insoluble in water” will be referred to as a “solubilized cosmetic composition”, but the specific form is not questioned. Further, in the present specification, “solubilized” means the ingredient difficult to be dissolved in water dissolves to at least the solubility in water and the turbidity of the aqueous solution is decreased. Further, in the present specification, “substantially not containing a surfactant” means not containing a surfactant as a means for solubilizing the cosmetic and is not intended to positively inhibit the formulating of a surfactant in the cosmetic composition for other purposes.
The solubilized cosmetic composition according to the present invention is a solubilized cosmetic composition in which an alkyl-modified carboxyvinyl polymer and hydroxyalkylated cyclodextrin are formulated as solubilizing agents.
As the alkyl-modified carboxyvinyl polymer formulated in the solubilized cosmetic composition of the present invention, mainly an acrylate-methacrylate alkyl copolymer can be mentioned. The alkyl-modified carboxyvinyl polymer may be produced using a standard method according to the specific molecular structure. As the modifying alkyl group, a C
10
to C
20
alkyl group may be mentioned.
Further, a commercially available alkyl-modified carboxyvinyl polymer may also be formulated in the solubilized cosmetic composition of the present invention.
As such a commercially available product, it is possible, for example, to formulate, as an acrylate-methacrylate alkyl copolymer, Carbopol 1342, Pemulen TR-1, Pemulen TR-2 (each made by BF Goodrich), etc. into the solubilized cosmetic composition of the present invention.
The amount of the alkyl-modified carboxyvinyl polymer formulated into the solubilized cosmetic composition of the present invention is preferably at least 0.0001% by weight and not more than 1.0% by weight, based upon the total weight of the cosmetic composition. If considering the balance of the solubilizing power and usability, it is particularly preferable to formulate it in a range of at least 0.001% by weight to not more than 0.5% by weight, based upon the total weight of the cosmetic.
If the amount of the alkyl-modified carboxyvinyl polymer is less than 0.0001% by weight, the desired solubilization is not sufficiently achieved. Contrary to this, when the amount is more than 1.0% by weight, there is a strong tendency for an accompanying sticky feeling in use, and therefore, are not preferable.
Note that, when using a non-alkyl-modified carboxyvinyl polymer such those normally used as a thickener, for example, Carbopol 941 (made by BF Goodrich), Hiviswako 105 (made by Wako Pure Chemical Industries Ltd etc., the solubilizing power is weak and it is not possible to produce the desired solubilized cosmetic composition.
Further, the hydroxyalkylated cyclodextrin formulated in the solubilized cosmetic composition of the present invention (hereinafter sometimes abbreviated as “HACD”)is a cyclodextrin known in the past as a cyclic oligosaccharide (hereinafter sometimes abbreviated as “CD”)at whose hydroxy group a hydroxyalkyl group is introduced. That is, as the cyclodextrin, cyclodextrins having &agr;-, &bgr;-, or &ggr;-structures depending on the different number of glucoses (hereinafter sometimes abbreviated as &agr;-CD, &bgr;-CD, and &ggr;-CD) are known and commercially available. The hydroxyalkylated cyclodextrin formulated in the solubilized cosmetic composition of the present invention is produced by hydroxyalkylating the hydroxy group of these cyclodextrins. Note that, among the cyclodextrins serving as the base of these hydroxyalkylated cyclodextrins, normally &bgr;-CD is used, but &agr;-CD or &ggr;-CD may also be used as a mother nucleus. Further, it is possible to use an amylolyte containing all of these &agr;-CD, &bgr;-CD, and &ggr;-CD as a mother nucleus.
The replacement of the hydroxy group of the cyclodextrin with a hydroxyalkyl group may be performed using an ordinary known means (for example, see JP-A-2-196709). Further, the mole substitution degree of the hydroxyalkyl group is preferably 1 to 14.
As the hydroxyalkyl group replacing the hydroxy group, for example, substituent group such as a hydroxymethyl group, hydroxyethyl group, hydroxypropyl group, may be illustrated.
By the substitution reaction, it is possible to obtain hydroxyalkylated cyclodextrins such as hydroxymethylcyclodextrin, hydroxyethylcyclodextrin, hydroxypropylcyclodextrin, hydroxybutylcyclodextrin, dihydroxypropylcyclodextrin.
Further, among these hydroxyalkylated cyclodextrins, considering the production cost and easy production and the usability and the solubility in water of the cosmetic composition obtained by formulating the same into the solubilized cosmetic composition of the present invention, it is preferable to formulate a hydroxyethylated &bgr;-CD or hydroxypropylated &bgr;-CD in the solubilized cosmetic composition of the present invention. However, the hydroxalkylated cyclodextrin which can be formulated into the solubilized cosmetic composition of the present invention is not limited to these hydroxyalkylated cyclodextrins.
Further, these hydroxyalkylated cyclodextrins may be formulated int
Ito Kenzo
Nishiyama Shoji
Suzuki Kazuaki
Tokue Wataru
Bawa Raj
Shiseido Company Ltd.
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