Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Reexamination Certificate
1999-07-01
2001-10-02
Gupta, Yogendra N. (Department: 1751)
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
C510S119000, C510S130000, C510S137000, C510S242000, C510S319000, C510S382000, C510S417000
Reexamination Certificate
active
06297204
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a cosmetic and/or dermatological composition comprising an aqueous phase and a separate oily phase, where the composition also contains poly(hexamethylene biguanide) hydrochloride as a preserving agent. The present invention also relates to the use of this composition for cleansing and/or removing make-up from the skin, mucous membranes and/or the eyes, and, in particular, for removing make-up from sensitive eyes.
2. Description of the Background
It is known practice to use compositions which are in the form of two separate phases and which become emulsified by shaking and demix on standing, for removing make-up from the eyes. Such a composition is described, for example, in EP-A-370,856.
These two-phase compositions generally contain preserving agents, in particular quaternary ammonium chlorides such as benzalkonium chloride. However, these compounds occasionally entail tolerance problems, in particular for individuals with sensitive eyes. As a result, it is an important goal to replace these preserving agents with other agents which are better tolerated.
In addition, the preserving agents usually used in compositions in the form of a single phase are often relatively incompatible with the two-phase pharmaceutical form, since these traditional preserving agents lead to physicochemical instabilities giving rise to the formation of a veil or a precipitate in the aqueous phase, or else they greatly disturb the water/oil interface leading to an off-putting appearance of the two-phase composition.
There is thus a need for a two-phase composition which stores well, and does not have the drawbacks of known compositions, i.e., a composition which has both a pleasant appearance and good stability.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a composition having enhanced stability, where the composition has two phases: an aqueous phase and a separate oily phase.
It is another object of the present invention to provide methods of cleansing and/or removing make-up from the skin, mucous membranes and/or the eyes using the composition described above.
The present inventors have unexpectedly discovered that poly(hexamethylene biguanide) hydrochloride (CTFA name: polyaminopropyl biguanide) gives stable two-phase compositions with good properties of both physicochemical and microbial storage, while at the same time allowing good make-up removal under highly satisfactory conditions of comfort and freshness. There was no indication to suppose that this preserving agent could be used successfully in two-phase compositions.
Accordingly, the objects of the present invention, and others, may be accomplished with a two-phase cosmetic and/or dermatological composition comprising of an aqueous phase and a separate oily phase, where the composition also comprises poly(hexamethylene biguanide) hydrochloride.
The objects of the invention may also be accomplished with a method of preserving a cosmetic composition comprising an aqueous phase and a separate oily phase, comprising incorporating an effective amount of poly(hexamethylene biguanide) hydrochloride into the composition.
The objects of the invention may also be accomplished with a method of cleansing and/or removing make-up from the skin, mucous membranes and/or the eyes, comprising applying the composition to the skin, mucous membranes and/or the eyes.
A more complete appreciation of the invention and many of the attendant advantages thereof will be readily obtained as the same becomes better understood by reference to the following detailed description when considered.
DETAILED DESCRIPTION OF THE INVENTION
Poly(hexamethylene biguanide) hydrochloride is present in the inventive composition in an amount which is sufficient to act as a preserving agent in the composition. Thus, this compound is present in an amount ranging, for example, from 0.01 to 0.5% of the total weight of the composition, and preferably from 0.01 to 0.05% of the total weight of the composition. These ranges include all specific values and subranges therebetween, including 0.02, 0.1, 0.2, 0.3 and 0.4% by weight.
The composition according to the invention comprises at least one aqueous phase (i.e., contains water) and a separate oily phase.
The aqueous phase in the composition of the invention may comprise sterile demineralized water and/or a floral water such as rosewater, cornflower water, camomile water or lime water, or a thermal water or natural mineral water such as, for example: eau de Vittel, waters from the Vichy basin, eau d'Uriage, eau de la Roche Posay, eau de la Bourboule, eau d'Enghien-les-Bains, eau de Saint Gervais-les-Bains, eau de Néris-les-Bains, eau d'Allevar-les-Bains, eau de Digne, eau de Maiziéres, eau de Neyrac-les-Bains, eau de Lons-le-Saunier, Eaux Bonnes, eau de Rochefort, eau de Saint Christau, eau des Fumades, eau de Tercis-les-bains and eau d'Avene. Mixtures of these waters may be used.
The oily phase in the composition according to the invention comprises at least one oil. The oil may be chosen from mineral, plant or synthetic oils or alternatively silicone oils, and mixtures thereof.
Examples of mineral oils which can constitute the oily phase include for example liquid petroleum jelly and higher aliphatic hydrocarbons such as, for example, isohexadecane or isododecane; among the plant oils, jojoba oil and safflower oil; among the silicone oils, which may be volatile, cyclomethicones such as cyclopentadimethylsiloxane, and among the synthetic oils, alkyl palmitates in which the alkyl group contains from 2 to 10 carbon atoms, such as isopropyl palmitate or octyl palmitate, and alkyl adipates in which the alkyl group contains from 2 to 10 carbon atoms, such as bis(2-ethylhexyl) adipate, or any other aliphatic ester containing from 12 to 20 carbon atoms, and mixtures thereof.
According to one specific embodiment of the invention, the oily phase contains at least one oil chosen from alkyl palmitates, isohexadecane, isododecane, volatile silicone oils (cyclomethicones), and mixtures thereof.
When the composition contains an alkyl palmitate, the latter is preferably present in a proportion of at least 5% and, preferably, in a proportion ranging from 8 to 30% of the total weight of the composition. These ranges include all specific values and subranges therebetween, including 6, 10, 12, 15, 20 and 25% by weight.
When the composition contains a volatile silicone oil, the proportion of this oil may range, for example, from 5 to 50% of the total weight of the composition. These ranges include all specific values and subranges therebetween, including 8, 10, 15, 20, 25, 30 and 40% by weight.
According to one preferred embodiment of the invention, the oily phase contains at least isohexadecane or isododecane, or a mixture of these two oils, in a proportion ranging from 5 to 50% and, preferably, 10 to 40% of the total weight of the composition. These ranges include all specific values and subranges therebetween, including 15, 20, 25, 30 and 40% by weight.
The two-phase composition of the invention may be free of surfactant. However, the composition may also comprise at least one surfactant in one or other of the phases.
The surfactant is preferably of the anionic, nonionic or amphoteric type. The surfactant is preferably nonionic. The surfactant is preferably present in the aqueous phase. It is preferably present in a proportion ranging from 0.01 to 10% (of active material) by weight relative to the total weight of the composition, and even more preferably from 0.025 to 3% of the total weight of the composition. These ranges include all specific values and subranges therebetween, including 0.05, 0.075, 0.1, 0.2, 0.5, 1.2, 5 and 8% by weight.
Among the nonionic surfactants, those which are particularly preferred include:
polyoxyethylenated fatty esters of sorbitol, such as the product sold under the name Tween 20® by Atlas.
polyoxyethylenated fatty alcohols, such as the product sold under the name Remcopal 21912 AL® by Gerl
Marion Catherine
Picard Elisabeth
Boyer Charles
Gupta Yogendra N.
L'Oreal
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
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