Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Cosmetic – antiperspirant – dentifrice
Reexamination Certificate
2001-02-14
2003-05-27
Krass, Frederick (Department: 1614)
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Cosmetic, antiperspirant, dentifrice
C424S063000, C424S064000, C424S065000, C424S068000, C424SDIG005, C514S944000, C514S951000
Reexamination Certificate
active
06569438
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to a cosmetic and dermatological preparation in the form of a stick for applying a composition dimensionally stable at ambient temperature and spreadable at body temperature to the skin, this composition comprising two or more gel phases of different composition.
BACKGROUND OF THE INVENTION
Two-phase stick preparations based on alcoholic soap gels have been known for some time, cf. for example DE-AS 1 122 221. Preparations such as these make is possible to introduce individual constituents which are incompatible with other components into one phase of the stick and thus to prevent unwanted interactions with the components of the second phase. The storage stability of the stick preparations can also be increased by introducing the more readily volatile or oxidation-sensitive components into the core or into one of the inner phases of the stick.
However, problems arise out of the fact that the contact between the two phases can lead to interactions between the phases, more particularly to the bleeding of individual components into the other phase. In order to prevent this, DE-A-2 752 420 proposes a two-phase antiperspirant stick which comprises a core of an oil solidified with waxes and an outer phase or jacket of a polyol soap gel.
These known stick preparations are unsatisfactory both in their sensorial properties and in their performance properties. Above all, they do not solve the problem of effectively preventing individual components of two-phase soap gel sticks from bleeding from one phase into the other phase.
Another problem to be solved was to develop multiphase stick preparations with a particularly attractive, aesthetically satisfactory appearance and improved sensorial properties.
BRIEF DESCRIPTION OF THE INVENTION
According to the invention, this problem has been solved by dispersing a porous powder of spherical polymer particles in one of the gel phases. Microspheres such as these can also be charged with sensitive active ingredients, readily volatile perfumes or dyes so that these components are stabilized.
Accordingly, the present invention relates to a stick preparation of a composition which is dimensionally stable up to 40° C., can be spread onto the skin and melts at temperatures above 40° C. and which consists of two or more separate gel phases of different composition which contain monohydric or polyhydric alcohols, gelling agents, perfumes, cosmetic or dermatological principles and optionally water and galenic auxiliaries, a porous powder of spherical polymer particles being dispersed in one of the gel phases in a quantity of 0.1 to 10% by weight, based on that phase.
In addition, the stick preparation according to the invention can be made aesthetically very attractive through differences in the transparency, coloring or pigmenting of the phases. The spherical polymer particles improve skin feel where corresponding sticks are used on the skin by increasing the lubricating effect and reducing tackiness. Finally, it has been found that perfumes and cosmetic principles can be at least partly absorbed in the porous polymer particles and released to the skin again under control, i.e. over a prolonged period. This slow-release effect can be enhanced by initially charging the porous polymer particles during their production with the perfumes and active principles and introducing them thus charged into the gel phase.
In the context of the present invention, the expression “gel phase” is understood to be a composition which comprises a liquid phase that has been solidified by a gelling agent. The liquid phase may consist of water, monohydric and polyhydric alcohols containing 2 to 8 carbon atoms and mixtures thereof. Suitable agents for gelling these liquid phases are surfactants which, dissolved in the liquid phase, form a network structure and thus solidify the liquid phase to form the gel. Gelling agents such as these are, for example, the metal salts of fatty acids, preferably those containing 12 to 22 carbon atoms, fatty acid amides, fatty acid alkanol-amides, dibenzal sorbitol and certain polymers, for example alcohol-soluble polyamides and polyacrylamides, or mixtures of these gelling agents. Preferred gelling agents are the alkali metal, alkaline earth metal, aluminium and amine soaps of C
12-22
fatty acids, for example sodium stearate, sodium palmitate, magnesium stearate or aluminium stearate.
Preferred polyhydric alcohols are polyols containing 2 to 8 carbon atoms and 2 to 6 hydroxyl groups, for example ethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, 1,2-butylene glycol, 1,3-butylene glycol, 1,4-butylene glycol, 2-methyl propane-1,3-diol, glycerol, erythritol, penta-erythritol, trimethylol propane, sorbitol, methyl glucoside, cyclohexane triol or inositol. Suitable monohydric alcohols are, for example, ethanol, n-propanol and isopropanol. Preferred components of the liquid phase are ethanol, 1,2-propylene glycol, butane-1,3-diol, glycerol, sorbitol and mixtures thereof, optionally even in admixture with water.
The gel phases additionally contain perfumes or cosmetic or dermatological principles.
Suitable perfumes or perfume oils include individual perfume compounds, for example synthetic products of the ester, ether, aldehyde, ketone, alcohol and hydrocarbon type. Perfume compounds of the ester type are, for example, benzyl acetate, phenoxyethyl isobutyrate, p-tert.butyl cyclohexyl acetate, linalyl acetate, dimethyl benzyl carbinyl acetate, phenyl ethyl acetate, linalyl benzoate, benzyl formate, ethyl methyl phenyl glycinate, allyl cyclohexyl propionate, styrallyl propionate and benzyl salicylate. The ethers include, for example, benzyl ethyl ether; the aldehydes include, for example, the linear alkanals containing 8 to 18 carbon atoms, citral, citronellal, citronellyloxyacetaldehyde, cyclamen aldehyde, hydroxycitronellal, lilial and bourgeonal; the ketones include, for example, the ionones, &agr;-isomethyl ionone and methyl cedryl ketone; the alcohols include anethol, citronellol, eugenol, geraniol, linalool, phenyl ethyl alcohol and terpineol and the hydrocarbons include, above all, the terpenes and balsams. However, mixtures of various perfumes which together produce an attractive perfume note are preferably used.
Perfume oils such as these may also contain natural fragrance mixtures obtainable from vegetable or animal sources, for example pine, citrus, jasmine, lily, rose or ylang-ylang oil. Other suitable perfume oils are essential oils of relatively low volatility which are generally used as aroma components, for example sage oil, camomile oil, clove oil, melissa oil, mint oil, cinnamon leaf oil, lime blossom oil, juniper berry oil, vetiver oil, olibanum oil, galbanum oil and labdanum oil,
Suitable cosmetic principles are, above all; substances which have a favorable effect on the aesthetic properties of the skin, more particularly on its smoothness and suppleness, on skin moisture, on perspiration and body odor and on the coloring or browning of the skin and on its protection against the harmful effects of the environment, more particularly sunlight.
Preferred cosmetic principles for the stick preparations according to the invention are, above all, deodorizing and perspiration-inhibiting substances. These are understood above all to be antimicrobial substances which have an inhibiting effect on perspiration-decomposing microorganisms or enzyme-inhibiting substances which inhibit the perspiration-decomposing esterase enzyme. Suitable antimicrobial agents are, for example, 2,4,4′-trichloro-2-2′-hydroxydiphenyl ether (Triclosan®), chlorhexidine gluconate, phenoxyethanol, pentane-1,5-diol, hexane-1,6-diol, antimicrobial essential oils and farnesol. Suitable lipase inhibitors are, for example, triethyl citrate and triacetin. Perspiration-inhibiting astringent substances compatible with the gel phase may also be present iii the stick preparations. Suitable antiperspirant agents are, for example, sodium aluminium chlorohydroxylactate, which is marketed under the name of Chloracel®
Banowski Bernhard
Bordat Pascal
Pöppl Marion
Scholz Wolfhard
Harper Stephen D.
Henkel Kommanditgesellschaft auf Aktien
Hill Gregory M.
Krass Frederick
Ortiz Daniel
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