Drug – bio-affecting and body treating compositions – Effervescent or pressurized fluid containing – Organic pressurized fluid
Reexamination Certificate
2001-07-05
2003-07-08
Venkat, Jyothsan (Department: 1615)
Drug, bio-affecting and body treating compositions
Effervescent or pressurized fluid containing
Organic pressurized fluid
C424S045000, C424S070120, C424S070130, C424S070140, C424S070150, C424S070160, C424S070210, C424S070270, C424S070280
Reexamination Certificate
active
06589509
ABSTRACT:
BACKGROUND OF THE INVENTION
The subject matter of the present invention is a product for hair treatment comprising a transparent pressurized container, an effective ingredient containing composition consisting of two clear, liquid phases clearly distinct from each other and a device for forming foam from the composition. The effective-ingredient-containing composition is dispensed from the pressurized container as foam and distributed on the hair. It can be used either as a leave-in-product and remains on the hair or it can be used as a rinse-out product and after a certain acting time it can be removed from the hair.
Hair care compositions, which are dispensed from pressurized containers as foams, are known and are designated as aerosol foams, foam aerosols or as care foams. These products comprise a pressurized container, a foam-generating top or head, an aqueous liquid phase and a liquid propellant gas phase. These products usually require a nontransparent container, for example made from metal or nontransparent plastic, since inhomogeneous, non-cosmetic and unattractively appearing turbid or cloudy masses form streaks at the phase boundary between the liquid propellant gas phase and effective ingredient-containing phase because of the interaction of propellants, effective ingredients, auxiliary ingredients and solvents. Alternatively, or in addition, one or both phases become turbid because of the combination of particular ingredients. However transparent containers are desirable because then it is easy to detect the amount of the composition remaining in the container, i.e. the filling state, whether or not sufficient mixing of the phases has occurred after shaking and, in some cases, whether or not a color of the contents has formed. Generally the transparent products of this kind have greater attractiveness.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a pressurized transparent hair care product for forming a foam, which is characterized by a distinctive streak-free reversible phase separation between an aqueous effective ingredient-containing phase and a liquid propellant phase, which is observable from the outside after shaking, without impairing the conventional hair care properties of the known conventional foams, or at least without significantly impairing them.
It has been found now that this object is attained in a hair treatment product comprising
(A) a transparent pressure-resistant aerosol container,
(B) a device for forming foam from a composition in the container,
(C) an effective ingredient-containing composition in the container comprising two liquid phases (D) and (E), which composition forms a foam when being dispensed from the container (A) by means of the foam-forming device (B) and in which (c1) both liquid phases are transparent and (c2) both liquid phases are separated from each other by a sharp or distinct phase boundary,
wherein (D) one of the liquid phases is hydrophilic and contains water or a solvent system comprising water and a water-soluble organic solvent, wherein (d1) the hydrophilic phase contains at least one cationic or cationically-active hair care ingredient and (d2) the hydrophilic phase contains at least one inorganic salt or non-polymeric organic salt, in which the cation of the salt is a metal ion or an ammonium ion, and
(E) the second liquid phase is hydrophobic and (e1) contains at least one water-insoluble propellant gas present in liquid form under the pressure conditions existing in the aerosol container and (e2) the hydrophobic phase contains at least one water-insoluble hydrophobic substance dissolved in the liquid propellant gas (e1).
The salt (d2) and the hydrophobic substance (e2) of course each alone improve the sharpness of the phase separation, i.e. they both produce a more distinct phase separation. The desired particularly distinct phase separation is however achieved by a synergistic action when the salt (d2) is added to the hydrophilic phase and the hydrophobic substance (e2) is added to the hydrophobic phase (see the comparative tests in example 6).
The cationic or cationically-active hair care substance (d1) is contained in the composition contained in the product according to the invention preferably in an amount of from 0.05 to 10, especially preferably from 0.1 to 5, percent by weight. The salt (d2) is preferably contained in the composition in an amount of from 0.05 to 2, especially preferably from 0.1 to 1.0, percent by weight.
The oily or fatty substance (e2) is preferably present in the composition in an amount of from 0.5 to 10, especially preferably from 1 to 5 percent by weight. The percentages of or amounts of the various ingredients are based on the total amount of the composition present.
The product according to the invention is packaged in a suitable pressure-tight aerosol container and includes a device for forming foam from the composition contained in the container as an additional component. For example, a commercial aerosol foam-forming head can be used as the device for forming foam from the composition. The container is made from a transparent material, through which the consistency, the filling height and the color of the composition are observable. Also because the container is transparent the extent of the mixing or separation of the two liquid phases is observable. The transparent container can be made from glass or transparent pressure-resistant plastic material. The plastic material is preferable on the basis of cost and weight. Polyethylene terephthalate is especially preferred as the plastic material for the transparent container.
Both liquid phases are clear, within the sense of the present invention, when no turbidity or streaking is detected with the naked eye. The phases are distinctly separated from each other within the sense of the present invention when no boundary layer, but only a phase separation line less than 1 mm, preferably less than 0.1 mm, is observable with the naked eye between the phases.
Solvents for the Hydrophilic Phase
The hydrophilic phase contains water either as the sole solvent or in a mixture with alcohol. The alcohol ingredient can comprise especially lower univalent alcohols having one to four carbon atoms, which are commonly employed for cosmetic purposes, such as ethanol and isopropanol, or multivalent alcohols with two to six carbon atoms, such as ethylene glycol, glycerol, propylene glycol, butylene glycol or pentandiol. The water content amounts preferably to 55 to 98% by weight, especially preferably 60 to 95% by weight, and the alcohol content amounts to preferably from 0 to 40, especially preferably 1 to 20, percent by weight, based on the total amount of the composition.
The hydrophilic phase preferably has a pH in a range of from 2 to 7, especially preferably from 4 to 6.5. The pH can be adjusted in the acid range with cosmetically compatible organic or inorganic acids, such as formic acid, tartaric acid, malic acid, maleic acid, fumaric acid, pyrrolidone carboxylic acid, citric acid, lactic acid, sulfuric acid, acetic acid, hydrochloric acid, phosphoric acid, among others.
Cationic Hair Care Ingredients
The cationic or cationically-active ingredients (d1) are substances, which have substantivity for human hair based on cationic or cationizable groups, especially protonated amine groups or quaternary ammonium groups. The cationic or cationically-active hair care ingredients (d1) are preferably selected from the group consisting of cationic polymers, cationic surfactants, cationic silicon compounds, cationic derivatized proteins, cationic derivatized protein hydrolyzates and betaine with at least one cationic or cationically-active group.
Particularly good hair-care action is obtained when at least one cationic polymer is combined with at least one cationic surfactant. The best action was obtained, when, in addition, at least one cationic silicon compound is contained, especially one diquaternary terminated polydimethylsiloxane.
Suitable cationic surfactants contain quaternary ammonium groups. Suitable cationic
Keller Walter
Kischka Karl-Heinz
Venkat Jyothsan
Wella AG
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