Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Reexamination Certificate
2000-06-12
2003-09-30
Douyon, Lorna M. (Department: 1751)
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
C510S122000, C510S128000, C510S406000, C424S047000, C424S070100, C424S070120
Reexamination Certificate
active
06627585
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to mousse-forming shampoo compositions. More particularly, the invention relates to mousse-forming shampoo compositions which include dispersed particles of a conditioning agent such as a silicone or oily material and which impart good conditioning benefits to hair and/or skin.
BACKGROUND AND PRIOR ART
Mousses are a particularly convenient and pleasant-to-use product form for hair treatment formulations. The product is generally applied to the user's hand, where it forms a creamy foam which can be easily worked through the hair.
Such mousses have found widespread use in the context of hair styling products. The conventional hair styling mousse generally utilises a water soluble hair styling polymer, water, possibly a conditioning agent, an emulsifier, aesthetic agents and an aerosol propellant. The mousse is typically applied to hair dampened with water, spread through the hair and allowed to dry, giving a temporary set which can be removed by water or by shampooing.
It would be desirable to provide a rinse-off surfactant-based cleansing shampoo in a mousse product form. Consumers appreciate the ease of dispensing and application of a mousse, and the way it can be worked through the hair without getting into the eyes. The latter would be particularly advantageous in the context of formulations based primarily on cleansing surfactants which can sometimes be harsh and irritating to the eyes. However, prior art systems of this type have not achieved much success, largely because the level of conditioning they deliver is insufficient for many people.
The problem stems mainly from the fact that the shampoo in the dispenser must dispense easily. This requirement is generally incompatible with shampoos which incorporate a significant amount of water-insoluble conditioning agents.
For example, silicones are highly desirable water-insoluble conditioning agents for incorporation into shampoos, as is well documented in the literature. However, the problem arises that the usual viscosity level required of the shampoo base in order to prevent the silicone from separating in the formulation is generally too high for effective dispensing of the shampoo from an aerosol formulation. This is manifest as a dispensing problem—the product will tend to dispense slowly and unevenly.
WO95/05158 describes an anionic surfactant based aerosol shampoo formulation. The exemplified formulations do not contain any silicones or other water-insoluble conditioning agents.
We have now found that rinse-off surfactant-based cleansing shampoo compositions can be formulated which deliver excellent conditioning performance from a mousse product form. Surprisingly, compositions of the invention are simple to formulate and can be dispensed easily from an aerosol can simply by agitation of the can where necessary.
SUMMARY OF THE INVENTION
The present invention provides a mousse-forming cleansing shampoo composition having improved conditioning performance comprising:
(a) a foamable concentrate comprising:
(i) at least one surfactant;
(ii) dispersed particles of water-insoluble conditioning agent having a particle size of one micron or greater;
(iii) an aqueous carrier; and
(b) an aerosol propellant.
DETAILED DESCRIPTION AND PREFERRED EMBODIMENTS
Foamable Concentrate
The mousse-forming cleansing shampoo composition of the invention comprises a foamable concentrate and an aerosol propellant. The term “concentrate” will be used to refer to the liquid component of the shampoo composition other than a mousse-forming cleansing shampoo composition having improved conditioning performance comprising:
(A) a foamable concentrate comprising:
(i) at least one surfactant;
(ii) dispersed particles of a water-insoluble conditioning agent having a particle size of 1 micron or greater;
(iii) an aqueous carrier; and
(B) an aerosol propellant. The term “mousse”, as used herein, is the same as foam, and refers to the dispensed product unless otherwise specified.
In general, for optimum dispensability of the product, we have found that the viscosity of the foamable concentrate should not exceed 3000 cps.
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 degrees 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. 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 include long chain (e.g. C8-C22) acyl 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 therein 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.
Conditioning Agent
The foamable concentrate comprises dispersed particles of a water-insoluble conditioning agent having a particle size of 1 micron or greater.
By “water insoluble” is meant is that the conditioning agent is not soluble in water (distilled or equivalent) at a concentration of 0.1 wt %, at 25° C. and pH 7.
Particle size may be measured by means of a laser light scattering technique, using a 2600D Particle Sizer from Malvern Instruments.
As used herein, the term “conditioning agent” includes any material which is used to give a particular conditioning benefit to hair and/or skin. For example, in shampoo compositions for use on the skin, materials such as moisturisers, essential oils, sun-protective or after-sun treatment materials, occlusive oils and the like may be used. In shampoo compositions for use on the hair, suitable materials are those which deliver one or more benefits relating to shine, softness, combability, wet-handling, anti-static properties, protection against damage, body, volume, stylability and manageability.
Preferred conditioning agents for use in compositions of the invention are selected from silicones, high molecular weight hydrocarbon materials, hair conditioning oily or fatty materials and mixtures thereof.
Silicones
Suitable silicones may be one or more polyalkyl siloxanes, one or more polyalkylaryl siloxanes, or mixtures thereof. The silicone is insoluble in the aqueous matrix of the foamable concentrate and so is present as dispersed particles.
The viscosity of the silicone itself preferably ranges from 10,000 cps to 5 million cps.
Suitable polyalkyl siloxanes include polydimethyl siloxanes which have the CTFA designation dimethicone, having a viscosity of up to 100,000 centistokes at 25 degrees C.
These siloxanes are available commercially from the General Electric Company as the Viscasil series and from Dow Corning as the DC 200 series. The viscosity can be measured by means of a glass capillary viscometer as set out further in Dow Corning Corporate Test Method CTM004 Jul. 20, 1970.
Also suitable is polydiethyl siloxane.
Also suitable are silicone gums, such as those described in U.S. Pat. No. 4,
Aronson Michael P.
Douyon Lorna M.
Unilever Home & Personal Care USA , division of Conopco, Inc.
LandOfFree
Mousse-forming shampoo compositions does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Mousse-forming shampoo compositions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Mousse-forming shampoo compositions will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3007210