Drug – bio-affecting and body treating compositions – Effervescent or pressurized fluid containing – Organic pressurized fluid
Reexamination Certificate
2000-04-26
2002-05-28
Bawa, Raj (Department: 1616)
Drug, bio-affecting and body treating compositions
Effervescent or pressurized fluid containing
Organic pressurized fluid
C424S045000, C424S070100, C424S070120, C424S070130, C424S070170
Reexamination Certificate
active
06395258
ABSTRACT:
This invention relates to mousse forming hair treatment compositions. More particularly, the invention relates to mousse forming hair treatment compositions, which may preferably be shampoos, which have improved foaming ability in the hair, and which may also deliver styling and setting properties from the delivery of anionic styling polymers.
It is known to try to provide mild surfactant based cleansing compositions for use on the hair and/or skin. It is also well known that, of the various surfactant types, that anionic surfactants are generally speaking the most harsh category of surfactants, even though they are desirable from a consumer point of view, because of the relatively high degree of lathering that they produce, with the consequent desirable sensory attributes.
Further it is known to provide so-called “three in one” hair care compositions, which are capable of cleaning, conditioning and styling the hair. Other associated benefits of such compositions may include curl retention, bodifying, stiffness and setting properties, with all such properties being supposedly deliverable from a single composition. An example of such a teaching is to be found in WO97/38673 (Stepan Company). In this application, the various benefits described above are said to be delivered from the hair care composition comprising 1 to 80% of a nonionic, semi polar nonionic, or amphoteric surfactant, or mixtures thereof, from 0.1 to 10% of a second surfactant which is a cationic surfactant, a fatty amine salt or mixtures thereof, and 0.001 to 10% by weight of an anionic polymer.
However, a problem with cosmetic compositions which are generally free of anionic surfactants (that is, they are based for example on nonionic, amphoteric and/or cationic surfactants) is that they have a tendency not to foam adequately, or may have poor sensory properties associated with foaming, such as a tendency for any foam that does generate to generate slowly, to spread slowly or to dissipate quickly. In the same way that foaming of a cosmetic composition, such as for example of a shampoo composition, is recognised as being a desirable attribute in a cosmetic product, generally leading to favourable consumer perceptions, so a product which does not foam, or does not foam adequately or with a suitable foam quality generally has perceived consumer negatives.
WO98/08149, the content of which is incorporated herein by reference, is representative of the art which describes mousse hair compositions, but it is silent on compositions which do not contain anionic surfactants, and indeed contains no teaching of a surfactant composition which is specifically free of anionic surfactant.
It is thus an object of the invention to provide a cosmetic composition which contains one or more surfactants, yet is substantially free of any anionic surfactants, and yet provides improved levels of foaming.
We have surprisingly found that in a hair treatment composition which is a shampooing composition, be it of the conventional or “2-in-1” type, that it is possible to improve the foaming capabilities and characteristics of an aqueous surfactant composition which is substantially free of anionic surfactants, by providing the surfactant composition in the form of a mousse forming concentrate, which can be combined with a propellant gas to provide a mousse forming composition. Thus, we have found that the foaming properties of an aqueous surfactant-containing composition which does not contain any substantial levels of anionic surfactant may be improved by the provision of such a composition in the form of a mousse.
Thus, according to a first aspect of the invention, there is provided a mousse forming hair treatment composition, which is preferably shampoo composition (optionally of the “2-in-1” type) and comprising a foamable concentrate comprising at least one surfactant, an aqueous carrier, and which is substantially free of anionic surfactants, and an aerosol propellant.
The invention also provides a topical mousse forming hair treatment product comprising the foamable concentrate and aerosol propellant described above, packaged in a can with hardware capable of generating a mousse on dispensing of the foamable concentrate.
Compositions according to the invention have been found to have particular benefits and advantages when the composition is one which contains an anionic styling polymer. In such circumstances, the composition according to the invention may provide not only improved foaming properties, but may also provide for good distribution of the anionic styling polymer within the hair. As such, improved styling using a composition containing an anionic styling polymer may be achieved.
In particular when the composition contains an anionic styling polymer, the composition according to the invention may be regarded as a so-called three-in-one composition, providing washing, conditioning and styling benefits.
Preferably, compositions according to the invention are also prepared such that they are free of a thickening agent. Such compositions, which typically form a foamable concentrate with a viscosity of less than 3000 centipoise (cps), have been found to have improved distribution in the hair when dispersed as a mousse composition from a propellant driven mousse container.
Preferably, compositions according to the invention comprise 85 to 98%, and more preferably 90 to 97% by weight of the aqueous foamable concentrate, with the balance being aerosol propellant.
The mousse-forming cleansing hair treatment composition of the invention comprises a foamable concentrate and an aerosol propellant. The term “concentrate” is used to refer to the liquid component of the hair treatment composition other than the propellant. The term “mousse”, as used herein, is the same as foam, and refers to the dispensed product, unless otherwise specified. The composition is packaged in appropriate hardware and in an appropriate manner so as to provide a topical product which dispenses a foamed mousse, the hardware and necessary techniques for this being well known to the skilled person.
The viscosity of the foamable concentrate suitably ranges from 1 to 3000, preferably from 10 to 2000, ideally from 100 to 1000 cps.
Viscosity is measured in the conventional manner using a rotary viscometer (Brookfield Viscometer, LVT type, Rotor No.3, 12 rpm after 30 sec. at 25° C.).
In order to achieve such suitable viscosities as described above for the foamable concentrate, it is particularly preferred that the foamable concentrate be substantially free of crystalline suspending agents and polymeric thickening agents. By “substantially free” it is generally meant that the level of such agents be about 0.5% or less, preferably about 0.1% or less, ideally no more than about 0.05% by weight of the foamable concentrate. Crystalline suspending agents which are preferably excluded or present in very low levels include long chain (e.g. C8-C22) alkyl derivative materials and long chain amine oxides, such as ethylene glycol long chain esters, alkanolamides of long chain fatty acids, long chain esters of long chain fatty acids, glyceryl long chain esters, long chain esters of long chain alkanolamides, and long chain alkyl dimethyl amine oxides. Common suspending agents of this type are ethylene glycol esters of C14-C22 fatty acids (e.g. ethylene glycol distearate), C16-C22 fatty acid alkanolamides (e.g. stearic monoethanolamide, stearic monoisopropanolamide), C16-C22 alkyl dimethyl amine oxides and N,N-dihydrocarbyl (C12-C22) amidobenzoic acid and salts thereof.
It may in some cases also be preferable, in order to achieve suitable viscosities as described above for the foamable concentrate, to incorporate a rheology modifier such as a thinner. Suitable thinners include polyethylene glycol (PEG), polypropylene glycol (PPG), sodium xylene sulphonate, sodium toluene sulphonate and urea. Preferred thinners are PEG 400 and PPG 400.
The foamable hair treatment composition comprises one or more surfactants, to provide a cleansing benefit, but is absent any substantial quantities of
Bawa Raj
Boxer Matthew
Unilever Home & Personal Care USA a division of Conopco, Inc.
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