FR2703926A1 - Stable microemulsion providing a dry contact spraying, process of preparation and device for use - Google Patents

Abstract

Stable oil-in-water microemulsion including an oily phase dispersed in an aqueous phase and at least one surfactant, in which the oily phase includes a perfuming composition which represents at least 30 % by weight of the oily phase; process of preparation; device and kit for use.

Description

The present invention relates to a stable microemulsion providing a

  dry contact spraying, its preparation process and a device for carrying out said process.5 Microemulsions are formulations having a certain number of advantages compared to emulsions

  simple; they are in fact transparent dispersions, of low viscosity, thermodynamically stable. Such characteristics make them particularly useful in the field of cosmetics.

  A micro-emulsion consists of liquid micro-droplets dispersed in a continuous phase

  also liquid The micro-droplets have at their periphery an alternation of surfactant and co-

  surfactant, and have a size between 100 and 500 A. A microemulsion is therefore a dispersion of a

  liquid in another liquid, consisting of four ingredients

  main teeth: an aqueous phase comprising water and optionally water-soluble compounds, an oily phase, non-ionic or amphoteric type surfactants, as well as co-surfactants stabilizing the emulsion, generally glycerol or polyglycerol esters , alcohol or

  polyalcohols, amines or organic acids.

  Microemulsions, like emulsions, are a dispersion of a liquid in another liquid Their contact on the skin is therefore that of a liquid; this contact

  is usually heavy and viscous.

  However, it would be desirable in the context of the cosmetic industry to give such dispersions of

  liquid in another liquid a dry, non-greasy touch.

  The Applicant has surprisingly discovered that spraying a micro-emulsion makes it possible to obtain a non-greasy sprayed micro-emulsion, giving a dry feel to the application. Such a sprayed micro-emulsion can

  be obtained from a particular stable microemulsion.

  This is why the present application relates to a stable oil-in-water microemulsion comprising an oily phase dispersed in an aqueous phase and at least one surfactant, characterized in that the oily phase comprises a perfuming composition which represents by weight at least 30 % of the oily phase. By "oily phase" we mean oils

  mineral or vegetable or perfuming agents.

  A perfume composition is a mixture of odorous substances with a pleasant odor of natural origin such as essential oils of lavender, lemon or rose and / or of synthetic origin such as aldehydes,

ketones, esters.

  They are used without dissolving in a solvent in an alkanol such as ethanol. The perfuming agent is a mixture of products of a liquid or viscous nature.

up to approximately 2000 m Pa S.

  The oily phase can for example comprise oils such as vegetable oils and preferably

macadamia oil.

  The aqueous phase can consist of water,

  especially distilled, and may further comprise substances

  these water-soluble minerals of mineral origin, such as sodium chloride, of vegetable origin, such as rose distilled water, or

  biological such as hyaluronic acid.

  The relative weight proportions of the oily phase to the aqueous phase can range from 5/95 to 40/60 and

  preferably from 5/95 to 20/80, and in particular from 5/95 to 10/90.

  The surfactant can represent by weight of 1%

  at 30% of the weight of all the constituents of the micro-

  emulsion, preferably from 5% to 15%.

  and especially from 9.5% to 10.5%.

  Among the surfactants, mention may be made, for example, of: hydrogenated ethoxylated castor oils, nonylphenols PEG, PPG-PEG alkyl ethers, preferably hydrogenated castor oils PEG from 20 to 40 and very particularly hydrogenated castor oil PEG 40 and PPG-26buteth-26. It is also preferably possible to add to the constituents of the present emulsion a co-surfactant, such as a glycerol or polyglycerol ester, an alcohol or polyalco-ol, an amine, an organic acid, preferably a polyalco-ol and preferably the dipropylene glycol. The co-surfactant can represent from 2% to 20% of the weight of all the constituents of this

  emulsion, preferably from 2% to 10% and very particular-

5 to 6%.

  The choice of surfactant (s) and possibly co-surfactants depending on the nature of the oily phase

  can be carried out according to conventional techniques for preparing stable microemulsions described in the literature.

  Among the constituents of the microemulsion one can also find various conventional additives in the field of cosmetics, such as moisturizing agents such as hyaluronic acid, softening agents such as allantoin, dyes such as those mentioned in the cosmetic directive 76 / 768 / EEC of July 27, 1976 and its modifications,

preservatives like parabens.

  These additives usually represent 2%

  at 10% of the weight of all the constituents of the micro-

  emulsion, preferably from 2% to 6% and very particular-

2% to 5%.

  The present application also relates to a process for the preparation of an emulsion described above, characterized in that the surfactant (s) and the oily phase are hot mixed at a temperature of 40 ° C. to 50 ° C. and if desired one or more co-surfactants, the aqueous phase is added with stirring, comprising, if desired, water-soluble additives in solution in part of said aqueous phase, using a stirrer of the bicone or turbo emulsifier type ,

  then, if desired, other additives (water-soluble and / or liposoluble) chosen from hydrating agents, softening

  healthy, or energizing. 5 Under preferential conditions for implementing the process described above, the surfactant or mixture of surfactants and, if desired, co-surfactants are brought separately to a temperature of 40 to 500 ° C.

  before mixing with the oily phase.

  the water-soluble additives are dissolved beforehand in a portion, preferably from 10 to 45% of the

  aqueous phase before their addition to the surfactant mixture (s) -

  oily phase, the mixture with stirring of the aqueous phase and the oily phase is carried out with medium stirring, preferably using a bicone type agitator, in particular at a speed of rotation of between 150 and 500 rpm , or

  a turbo emulsifier from 1000 to 2500 rpm.

  As we saw above, such emulsions,

  sprayed, have a dry, non-greasy feel.

  This is why the present application also relates to a process for the preparation of micro-emulsions with a dry and non-greasy feel, characterized in that a stable oil-in micro-emulsion is sprayed with a sprayer. water comprising an oily phase dispersed in an aqueous phase and at least one surfactant, characterized in that the oily phase comprises perfuming agents which represent by weight at least 30% and preferably at

minus 50 t of the oily phase.

  By “sprayer” is meant the spraying device, associated if desired with the container containing the microemulsion. The system used is preferably without propellant, and spraying is obtained by pressing on

  a plunger generally combined with the nozzle.

  The present application also relates to a device for implementing the method described above, characterized in that it comprises a bottle containing a microemulsion as defined above as well as a

  spraying system of said microemulsion.

  The present invention finally relates to a kit for implementing the method described above, characterized in that it comprises on the one hand a bottle containing the microemulsion as defined above, and on the other hand a bottle fitted with a spraying system capable of spraying

  said microemulsion. 10 A spraying system is advantageously used.

  sation with pump, in particular of type VP 7 of the Valois Company in preference to a propellant liquid system The diameter and the angle of spraying of the nozzle duct can be determined by a few simple tests depending on the

microemulsion used.

  The examples which follow illustrate the present invention without however limiting it: EXAMPLE 1 A stable micro-emulsion with a dry and non-greasy touch having the following composition by weight was prepared: Demineralized water 75.598% Sodium methyl parahydroxybenzoate preservatives 0.30% phenoxyethanol 0.50% mixture PPG 26-Buteth 26 and hydrogenated castor oil-PEG 40 9, 80% Dipropylene glycol 5.60% Moisturizers and softeners hyaluronic acid 0.02% allantoin 0.20% Fragrance composition (fruity floral note) 7.00% Mixture marketed by WACKHER under the

reference "SOLUBILISANT LRI".

  Stage A: the hydrogenated castor oil-PEG 40 is mixed and

  PPG 26-Buteth 26 with dipropylene glycol, and heat the mixture to 400 C in a water bath.

  Stage B: the oily perfuming composition is incorporated using a propeller stirrer into the product obtained in Stage A, and mixed for 10 minutes at a speed of rotation

about 150 rpm.

  Stage C: The preservatives are dissolved at 80 ° C. in

  about 30% of demineralized water and maintains the solution obtained at 80 ° C.

  Stage D: The solution of preservatives obtained in Stage C is transferred to the perfuming solution obtained in Stage B, mixing with moderate stirring using a bicone type agitator (at approximately 250 rpm) and incorporating the rest of demineralized water until the solution has cleared

always under agitation.

  The hydrating agents are then introduced and the

  softening agents until complete dissolution.

  Stage E: The stable microemulsion thus obtained is packaged in a sprayer comprising a

  VP 7 pump spraying from Valois.

  After conditioning, the sprayer is pressed

  sator to obtain a micro-emulsion with a cosmetic feel

non-greasy and dry on application.

Claims (5)

  1 Oil-in-water stable micro-emulsion comprising an oily phase dispersed in an aqueous phase and   at least one surfactant, characterized in that the oily phase5 comprises a perfuming composition which represents by weight at least 30% of the oily phase.   2 Microemulsion according to claim 1, characterized in that the perfume composition represents   by weight at least 50% of the oily phase.   3 A method of preparing a microemulsion as defined in one of claims 1 and 2, character-   risé in that one mixes hot at a temperature of 40 OC to 50 OC the surfactant (s) and the oily phase and if desired one or more co-surfactants, the aqueous phase comprising, if desired, is added with stirring , water-soluble additives in solution in part of said aqueous phase, using a bicene or turbo-emulsifier type stirrer, then if desired other water-soluble or liposoluble additives chosen from hydrating, softening or energizing agents. 4 Microemulsion according to any one of   claims 1 and 2 characterized in that it presents itself   in a sprayed form using a sprayer.   Method for preparing a microemulsion   according to claim 4, characterized in that one sprays-   make a microemulsion as defined in one of claims 1 and 2.   6 Device for implementing the method according to claim 5, characterized in that it comprises a bottle containing the microemulsion as defined in one   of claims 1 and 2, said bottle being provided with a   spraying system capable of spraying said micro- emulsion.   7 kit for implementing the method according to claim 5, characterized in that it comprises of   firstly a bottle containing the microemulsion as defined in one of claims 1 and 2, and secondly a bottle   provided with a spraying system capable of spraying said microemulsion.