Drug – bio-affecting and body treating compositions – Effervescent or pressurized fluid containing – Organic pressurized fluid
Reexamination Certificate
1997-11-24
2002-07-23
Page, Thurman K. (Department: 1615)
Drug, bio-affecting and body treating compositions
Effervescent or pressurized fluid containing
Organic pressurized fluid
C424S070100, C424S070110, C424S070120, C424S070150, C424S070160, C424S070200
Reexamination Certificate
active
06423297
ABSTRACT:
The present invention relates to novel aerosol devices intended to fix the hair.
The hair products, for shaping and/or holding the hairstyle which are the most widely available on the cosmetics market are spray compositions comprising a solution, usually an alcoholic or aqueous solution, and one or more materials, generally polymer resins, whose function it is to form welds between the individual strands of hair, these materials also being known as fixing materials, mixed with various cosmetic adjuvants. These solutions are generally packaged either in a suitable aerosol container placed under pressure with the aid of a propellant or in a pump-dispenser bottle.
Many aerosol systems intended to fix the hair are known; these systems containing, on the one hand, a liquid phase (or fluid) and, on the other hand, a propellant. The liquid phase contains the fixing materials and a suitable solvent. The function of the propellant is to provide a pressure which allows the liquid phase to be sprayed and to be applied to the hair in the form of a cloud of dispersed droplets. It is after the liquid phase has been applied to the hair that it dries, allowing the formation of welds which are necessary for fixing the hair, by means of the fixing materials.
It is desired that the welds be rigid enough to ensure that the hair is held in place. However, it is also desired that they be fragile enough for the user to be able to destroy them by combing or brushing the hair, without damaging the scalp or the hair.
The fixing materials are generally fixing polymers, that is to say film-forming polymers that are soluble or dispersible in water and/or in alcohol, such as vinyl acetate/crotonic acid copolymers and anionic or amphoteric acrylic resins. These materials make it possible readily to obtain the fixing effect but, on the other hand, after brushing or combing, under the usual conditions of lacquering, the hair looks stiff and has a coarse or even sticky feel and is often difficult to disentangle.
These drawbacks are linked to several parameters, among which mention may be made of the nature of the fixing polymer(s), or alternatively the nature of the welds. To overcome these drawbacks, it is desirable to act on these two parameters without, however, diminishing the desired fixing effect. To improve the cosmetic properties of fixing materials, it has been proposed to combine different polymers, for example in the documents, WO 94/12148, WO 96/06592 and U.S. Pat. No. 5,158,762, the disclosures of which are specifically incorporated by reference herein.
The inventors have found that by appropriately selecting, on the one hand, the fixing polymers and, on the other hand, the diffusion parameters for the compositions, it is possible to act on the quality of the welds while at the same time retaining good fixing and/or hair shaping qualities, and thus to provide excellent cosmetic properties such as softness, disentangling and feel.
The aerosol device according to the invention comprises a container containing an aerosol composition comprising, on the one hand, a liquid phase (or fluid) containing at least one fixing material in a suitable solvent and, on the other hand, a propellant, and a means for distributing the aerosol composition, the fixing material having a glass transition temperature (Tg) of greater than or equal to 30° C., the fixing material comprising at least one anionic grafted silicone polymer having a polysiloxane skeleton grafted with at least one anionic hydrocarbon radical, and the device being suitable for obtaining a wetting power of greater than or equal to 30 mg/s.
The distribution means generally comprises a distribution valve controlled by a distribution head, itself comprising a nozzle through which the aerosol composition is vaporized.
The terms “Tg” and “wetting power” as understood according to the present invention are defined below.
According to the present invention, the expression glass transition temperature (Tg) is understood to refer to the Tg of the fixing material in the dry extract, the dry extract comprising all of the non-volatile materials in the fluid, or solids.
According to the present invention, the wetting power corresponds to the amount of product received by a sheet of plastic placed 35 cm away from the nozzle of the aerosol device over a given unit of time. The product then comprises the solids plus some of the solvent which has not evaporated over the trajectory plus, possibly, some of the non-evaporated propellant. This wetting power is expressed in mg/s and is measured according to the invention by the following method:
a sheet of plastic 21 cm×23 cm in size is suspended vertically on a precision balance ({fraction (1/1000)}), the sheet being connected to the balance via the upper edge (generally by means of a balance hook inserted into a perforation placed at the center of the width and 1 cm from the upper edge of the sheet), and is kept vertical by applying a weight centered on the lower edge (generally by means of a clip fixed to and centered on the lower edge);
a block is placed behind the lower edge of the sheet in order to keep the sheet vertical during impacting of the product;
the aerosol device is placed vertically such that the composition diffusion nozzle is arranged at the center and 35 cm away from the vertical sheet, to allow vaporization of the product perpendicular to the sheet;
the composition is vaporized for 5 seconds; and
the amount of product received on the vertical sheet is measured once the vaporization is complete.
For greater precision, a suitable device comprising a support means for the aerosol device and means for allowing three-dimensional adjustment of the position of the nozzle relative to the vertical sheet may be used. This device may also be equipped with a pneumatic spray-control (firing and duration) device, so as to control the duration of the vaporization precisely. The whole assembly may be controlled by computer.
To avoid any environmental interference, the trajectory of the product between the nozzle and the sheet will advantageously be protected horizontally and vertically by the walls of a tunnel of suitable size.
Lastly, the product is advantageously vaporized under a controlled atmosphere, preferably at a temperature of 20° C. and at a relative humidity of 30%.
Preferably, the fixing material has a Tg of greater than or equal to 60° C.
Advantageously, the fixing material comprises the anionic grafted silicone polymer, alone or in combination with common cosmetic additives, for example plasticizers or neutralizing agents.
According to the present invention, and in accordance with general acceptance within the cosmetics art, the term silicone polymer is understood to denote any organosilicon polymer or oligomer with a linear or cyclic, branched or crosslinked structure, of variable molecular weight, obtained by polymerization and/or polycondensation of suitably functionalized silanes, and comprising a repetition of main units in which the silicon atoms are connected together by oxygen atoms (siloxane bond ≡Si—O—Si≡), optionally substituted hydrocarbon radicals being linked directly via a carbon atom onto the silicon atoms. The most common hydrocarbon radicals are alkyl radicals, especially C
1
-C
10
alkyl radicals and, in particular, methyl, fluoroalkyl radicals, aryl radicals and in particular phenyl, and alkenyl radicals and in particular vinyl; other types of radicals which may be linked, either directly or via an anionic hydrocarbon radical intermediate, to the siloxane chain are especially hydrogen, halogens and in particular chlorine, bromine or fluorine, thiols, alkoxy radicals, polyoxyalkylene radicals (or polyethers) and in particular polyoxyethylene and/or polyoxypropylene, hydroxyl or hydroxyalkyl radicals, substituted or unsubstituted amine groups, amide groups, acyloxy or acyloxyalkyl radicals, hydroxyalkylamino or aminoalkyl radicals, quaternary ammonium groups, amphoteric or betaine groups, anionic groups such as carboxylates, thioglycolates, sulphosuccinates, thiosulp
Dupuis Christine
Samain Henri
Channavajjala Lakshmi
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
L'Oreal
Page Thurman K.
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