Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Cosmetic – antiperspirant – dentifrice
Reexamination Certificate
1999-07-09
2003-08-05
Page, Thurman K. (Department: 1615)
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Cosmetic, antiperspirant, dentifrice
C424S078020, C424S078030, C424S489000
Reexamination Certificate
active
06602513
ABSTRACT:
FIELD OF THE INVENTION
This invention relates in general to a pack cosmetic, and more particularly to a pack cosmetic containing dextrin as the main film agent which gives high levels of tension, adhesion, and a stretched feeling during use after drying; it not only gives a good feeling during use as a pack agent but also is easy to remove without straining the skin and leaves a moist feeling after removal.
BACKGROUND OF THE INVENTION
Conventionally, pack cosmetics can be largely divided into those which contain a large amount of humectants and oil for the purpose of moisture retention and activation of the skin and those which are given higher tension and adhesion during use for the purpose of cleansing.
Both types use, as the film agent, polyvinyl alcohol, vinyl acetate emulsion, xanthan gum, carboxyvinyl polymer, polyvinyl pyrolidone, and synthetic cellulose type polymer compounds.
However, the pack cosmetic which is given high tension and adhesion for the purpose of cleansing forms a film hardly soluble in water after drying and therefore strains the skin significantly when being peeled off and is not easy to remove, making it unsuitable for application on the whole face.
Also, the pack cosmetic which aims at moisture retention and activation does not form a strong film and therefore it does not give adequate tension and adhesion. There has not been any pack cosmetic which simultaneously gives moisture retention and activation effects as well as adequate tension and adhesion.
In view of the aforementioned situation, the inventors conducted earnest research to obtain a pack cosmetic which gives high tension, adhesion, and a stretched feeling during use and does not strain the skin when being peeled off, and discovered that a pack cosmetic which solves the aforementioned problem, i.e. gives adequate tension, adhesion, and a stretched feeling to the skin and is easy to peel off after use, giving a superior moist feeling, can be obtained by blending in dextrin as the main film agent in the pack base agent, thus completing the present invention.
The object of the present invention is to provide a new pack cosmetic which gives high tension, adhesion, and a stretched feeling during use, is easy to remove without straining the skin, and can give a superior moist feeling.
DISCLOSURE OF THE INVENTION
That is, the present invention provides a pack cosmetic which characteristically contains dextrin.
Also, the present invention provides the aforementioned pack cosmetic which additionally contains a polymer compound.
Furthermore, the present invention provides the aforementioned pack cosmetic wherein the aforementioned polymer compound is one or more substances selected from a group consisting of polyvinyl acetate, polyethyl acrylate, polyvinyl pyrolidone, polyvinylmethyl ether, alkanolamine polyacrylate, and vinyl pyrolidone-vinyl acetate copolymer.
Also, the present invention provides the aforementioned pack cosmetic which additionally contains an alcohol.
Furthermore, the present invention provides the aforementioned pack cosmetic which additionally contains a powder.
Also, the present invention provides the aforementioned pack cosmetic which additionally contains oil and a surfactant.
Furthermore, the present invention provides the aforementioned pack cosmetic wherein said pack cosmetic is a peel-off, wipe-off, or rinse-off type pack cosmetic.
THE BEST MODES OF THE EMBODIMENTS
The configuration of the present invention is described in detail below.
The dextrin for use in the present invention refers to the intermediate products of the process of hydrolyzing starch to maltose. They are represented by the general formula (C
6
H
10
O
5
)n.xH
2
O and obtained by treating starch with enzymes, acid, heat, etc.
There are various types of dextrin depending on the method of hydrolysis. Examples include soluble starch, thin-glue starch, amylodextrin, white dextrin, yellow dextrin, erythrodextrin, and achrodextrin. Any one or more of them can be selected for use. For example, a water soluble mixture with various molecular weights can be used which is prepared by obtaining crude dextrin through a heating treatment, hydrolysis with acid, or hydrolysis with diastase of starch, dissolving it in water, followed by purification by means of precipitation using alcohol. Commercial products can be used.
The blend ratio of the dextrin in the pack cosmetic is preferably 0.5-25 wt %, more preferably 3.0-20 wt %, the most preferably 10-15 wt %, of the total pack cosmetic. If it is less than 0.5 wt % then adequate tension, adhesion, and a stretched feeling on the skin may not be achieved. If it is more than 25 wt % then there may be stability problems in that gelation occurs over time, discoloration occurs at high temperatures, etc.
It is preferable that the pack cosmetic of the present invention contain a polymer compound in addition to the aforementioned essential ingredients. Combined use with the polymer compound allows even higher tension, adhesion, and stretched feeling on the skin and increases the viscosity of the pack cosmetic to facilitate the application. This also has the effect of removing keratotic plugs.
The polymer compound used in the present invention is one of those which can be blended into the pack cosmetic in the form of an emulsion polymer or water soluble polymer. For the emulsion polymer, preferable are polyvinyl acetate and polyethyl acrylate. For the water soluble polymer, preferable are polyvinyl alcohol, polyvinyl pyrolidone, polyvinylmethyl ether, alkanolamine polyacrylate, vinyl pyrolidone-vinyl acetate copolymer, gum arabic, gelatin, methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, sodium carboxymethyl cellulose, sodium arginate, alkyl methacrylate-dimethylaminoethyl methacrylate copolymer, polymethacryloyloxytrimethyl ammonium, and poly-2-acrylamide-2-methylpropanesulfonic acid. Particularly preferable examples in terms of both usability, such as giving a stretched feeling, and removal of keratotic plugs include polyvinyl acetate, polyethyl acrylate, polyvinyl pyrolidone, polyvinylmethyl ether, alkanolamine polyacrylate, and vinyl pyrolidone-vinyl acetate copolymer.
One or more of these polymer compounds can be selected for blending in. The blend ratio is preferably 0.1-10 wt % of the total pack cosmetic.
In addition to the aforementioned essential ingredients, it is preferable to blend an alcohol into the pack cosmetic of the present invention. Combined use with an alcohol allows even higher tension, adhesion, and stretched feeling on the skin and has the effect of accelerating the drying process after application of the pack cosmetic.
The alcohol used in the present invention is a lower alcohol, preferably ethanol or isopropanol. The blend ratio is preferably 1-30 wt % of the total pack cosmetic.
In addition to the aforementioned essential ingredients, it is preferable to blend a powder into the pack cosmetic of the present invention. Combined use with a powder allows even higher tension, adhesion, and stretched feeling on the skin and has the effect of accelerating the drying process after application of the pack cosmetic.
For use as the powder in the present invention, the mica type, the talc type, resin powder (including those which are spherical), silica, etc. are preferably used. One or more of these can be selected for blending in. The blend ratio is preferably 0.1-20 wt %.
In the present invention, oils and surfactants can be blended in addition to the aforementioned ingredients to further improve usability. The addition of an oil and a surfactant significantly improves the spreading during application on the skin, improves the moist feeling after use, and provides a pack cosmetic with a very smooth feeling.
The oil used in the present invention is not limited in particular, and any oil which is used in cosmetics can be used. Examples include natural animal/plant oils/fats such as macademia nut oil, evening primrose oil, olive oil, mink oil, jojoba oil, lanolin, and squalene; hydrocarbons such as liquid petrolatum, squalane, and petrolatum; higher alcohol
Ishiwatari Masaaki
Mochizuki Miyoko
Nishida Miharu
Bennett Rachel M.
Shiseido Co. Ltd.
Townsend & Banta
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