FIELD OF THE INVENTION

The present invention is targeted towards improved deposition of a conditioning agent such as of microemulsified conditioning silicone oil, and in particular, relates to conditioning cosmetic compositions such as shampoos involving the same adapted to deliver superior conditioning benefits by enhancing the conditioning performance of said silicones in surfactant based shampoo compositions. Advantageously, the invention is directed to such conditioning shampoo compositions adapted to deliver superior conditioning benefits, compatibility, softness and shine to the hair.

BACKGROUND OF THE INVENTION

The use of silicones in hair shampoo compositions for improving conditioning is very well known. Generally the silicones are dispersed /suspended in the composition which is then applied to the hair to deposit silicones. The prior art literature suggests that steps have to be taken to prevent creaming of the emulsified droplets of the silicones present in the composition during storage. To prevent such a situation, in the prior art, certain materials such as certain gums and/ or crystalline materials like ethylene glycol di stearate are incorporated in the composition. The use of such materials renders the resulting composition cloudy or opaque. Another disadvantage is that such materials lead to dulling of the hair as well as lowering of other conditioning attributes of the composition.

Prior art also teaches incorporating silicones as micro-emulsion. In such a process high viscosity emulsion is used. It is known that such a composition does not give sufficient conditioning benefit for people. To overcome this problem it has been suggested to use microemulsions of silicone wherein the silicone is very slightly cross linked in the emulsion form and in addition, use of specific type of cationic guar gum derivative has also been recommended.

One known method of improving deposition of a conditioning agent such as micro emulsified conditioning oil of particle size less than 2 micron from the composition involves the use of cationic deposition polymers. These polymers may be synthetic or natural polymers that have been modified with cationic substituents.

EP0432951 (Unilever) discloses a shampoo composition containing surfactant together with a cationic derivative of guargum and an insoluble non-volatile silicone present as emulsified particles having average particle size below 2 micron and the silicone is incorporated in emulsified form.

EP 0529883 (Unilever) discloses a conditioning shampoo composition for hair or skin contains a stable microemulsion of conditioning oil e.g. silicone with a particle size of less than or equal to 0.15 micron in combination with a deposition copolymer of a cationic derivative of guar gum or a cationic cellulose ether derivative.

WO95/09599 (Unilever) discloses a hair conditioning shampoo compromising of anionic surfactant, water, emulsion copolymerized dimethiconol nonionic conditioning copolymer having the formula OH-Si(CH2)-0-[Si(CH2)-0-]nSi(CH2)-OH where n is greater than 2,700 and cationic depositing copolymer having a charge density between 0.1 and 4 meq/g and comprising hydroxyalkyl cellulose ethers and cationic guar derivatives.

However, the conditioning delivered involving such available formulations are not always acceptable to the consumers as the conditioning performance may be insufficient for many people who desire high level of conditioning.

Therefore it is clearly apparent that in spite of the presence of such wide varieties of shampoo compositions, there still remains a continuing need in the art to provide for new, improved shampoo compositions for the purpose of imparting superior benefits to hair by enhancing the conditioning performance of surfactants in said shampoo composition containing silicones to deliver higher levels of conditioning such as improved shine and softness alongwith superior compatibility.

OBJECTS OF THE INVENTION

It is therefore the basic object of the present invention to provide for a conditioning cosmetic compositions such as shampoos that would be adapted to deliver superior conditioning benefits by suitably enhancing the conditioning performance of insoluble nonvolatile conditioning agents in surfactant based shampoo compositions.

Another object of the present invention is to provide for the said cosmetic composition preferably shampoo compositions adapted to deliver superior conditioning benefits, compatibility, softness and shine to the hair.

Further object of the present invention is directed to provide for shampoo/like compositions with superior conditioning benefits, compatibility, softness and shine to the hair.

SUMMARY OF INVENTION

Thus according to the basic aspect of the present invention there is provided a shampoo composition with superior conditioning attributes comprising ingredients in addition to water (i) insoluble non-volatile conditioning agents (ii) at least one cationic acrylamide copolymer; and (iii) at least one cationic amidoamine and (iv) atleast one surfactant selected from anionic, nonionic, zwitterionic or amphoteric surfactants or mixtures thereof.

According to another preferred aspect of the present invention there is provided said shampoo composition wherein the ratio of cationic acrylamide copolymer and cationic amidoamine varies from 1:1 to 1:5.

According to yet another preferred aspect of the present invention there is provided said shampoo composition with superior conditioning attributes wherein said ingredient (i) involving insoluble non-volatile conditioning agents includes silicones, hydrocarbon oils.

Preferably, said silicones of the shampoo composition involve insoluble non-volatile silicones comprising pre-emulsified particles of said insoluble non-volatile silicones of particle size of less than 1 micron and viscosity of at least 3 lacs cps.

More preferably, said insoluble non-volatile silicones are selected from at least one or more of polydimethylsiloxane such as dimethicone, dimethiconol or mixtures thereof.

According to yet another preferred aspect of the present invention there is provided said shampoo composition wherein said cationic acrylamide copolymer are selected from the copolymers of methacrylamidopropyltrimonium chloride and/or acrylamidopropyltrimonium chloride with acrylamide providing polymethyacrylamido propyltrimonium chloride and acrylamidopropyltrimoniumchloride /acrylamide copolymer.

According to another preferred aspect of the present invention there is provided said shampoo composition wherein said cationic amidoamines are selected from behenamidoethyldimethylamine, behenamidoethyldiethylamine, behenamidoethyldimethylamine, arachidamidopropyldimethylamine, Arachidamidoethyldiethylamine or mixtures thereof.

According to another aspect of the present invention there is provided a process for manufacturing said shampoo composition comprising the steps of

(a) providing in addition to water said ingredients (i) insoluble non-volatile conditioning agents comprising insoluble non-volatile silicones comprising pre-emulsified particles of said insoluble non-volatile silicones of particle size of less than 1 micron and viscosity of at least 3 lacs cps (ii) at least one cationic acrylamide copolymer (iii) and at least one cationic amidoamine wherein the ratio of cationic acrylamide copolymer to cationic amidoamine is in the range of 1:1 to 1:5 (iv) at least one surfactant selected from anionic, amphoteric, non-ionic, zwitterionic; and (b) obtaining the shampoo composition therefrom.

Surprisingly, it was found by way of the present invention that the conditioning performance of insoluble non-volatile conditioning agents comprising emulsified particles of non-volatile silicones only when synergistically combined with a cationic acrylamide copolymer and cationic amidoamine significantly boosted the conditioning benefits of the surfactant based shampoo composition of the present invention. In accordance with an aspect of the present invention, insoluble non-volatile conditioning agents comprising emulsified particles of non¬volatile silicones only when synergistically combined with cationic acrylamide copolymer and cationic amidoamine and incorporated in the surfactant based shampoo composition, unexpectedly improves the conditioning performance of said emulsified silicones by way of improving its deposition characteristics in said surfactant based shampoo composition even in the absence of any cationic guar & cationic cellulose derivative usually included as conventional depositing polymers in the shampoo compositions constituting the state of the art.

DETAILED DESCRIPTION OF THE INVENTION

As discussed hereinbefore the present invention thus provides for an improved conditioning cosmetic composition such as shampoo composition involving insoluble non-volatile conditioning agents including emulsified particles of insoluble non-volatile silicones, hydrocarbon oil present in synergistic combination with cationic acrylamide copolymer and cationic amidoamine in addition to surfactants and water, wherein the conditioning performance of said insoluble non-volatile conditioning agents in surfactant based shampoos are improved significantly thereby delivering superior conditioning benefits.

Accordingly the invention provides for an improved conditioning shampoo composition involving insoluble non-volatile silicones comprising emulsified particles of said insoluble non-volatile silicones with particle size of less than 1 micron and viscosity of at least 3 lacs cps present in combination with a synergistic mixture of cationic acrylamide copolymer and cationic amidoamine in addition to said surfactants and water.

According to another aspect of the present invention there is thus provided a shampoo composition with superior conditioning attributes comprising ingredients in addition to water (i) insoluble non-volatile conditioning agents (ii) at least one cationic acrylamide copolymer; and (iii) at least one cationic amidoamine; (iv) atleast one surfactant selected from anionic, nonionic, zwitterionic or amphoteric surfactants or mixtures thereof.

According to another preferred aspect of the present invention there is provided said conditioning shampoo composition wherein said ingredient (i) involving insoluble non¬volatile conditioning agent comprises insoluble non-volatile silicones comprising emulsified particles of said insoluble non-volatile silicones of particle size less than 1 micron and viscosity of at least 3 lacs cps ; and a process for manufacturing the same.

The invention is described hereunder in greater details in relation to the non-limiting exemplary comparative illustrations.


(1) Non-volatile polydimethyl siloxane included was an emulsion of dimethiconol of internal oil viscosity atleast 3 lacs cps and particle size of less than 1 micron which is available commercially from Dow corning, Wacker etc.;

(2) Cationic guar included was Guar Hydroxypropyltrimonium chloride from Rhodia;

(3) Cationic acrylamide included was selected from cationic acrylamide copolymer.

Performance evaluation of Formulations under Known composition and Composition of invention (3) above:

Performance and comparisons of the composition of the present invention illustrated in Composition of invention (3) against known shampoo composition was done using paired comparison salon tests for foam, cleansing, softness of washed hair while wet, softness of hair after drying, ease of combing of dried hair and making hair manageable. The evaluations were performed by a trained, licensed cosmetologist.

Following use of the compositions, the consumers were asked to assess their hair for the above said attributes. The findings are illustrated hereunder:

Composition of the present invention (3) and known composition were assessed by a panel of volunteers in salon by half head method which is known to the person skilled in the art.
Following use, the consumers were asked to assess on their own hair on foam, cleansing, softness of washed hair while wet, Softness of hair after drying, ease of combing of dried hair and making hair manageable. Composition of the present invention (3), was rated significantly better in terms of softness of washed hair while wet, softness of hair after drying, ease of detangling and combing of dried hair and making hair manageable and shine compared to the known composition.

Performance evaluation of Formulations under composition of invention and Composition (1) above:

Performance and comparisons of the composition of the present invention (3) against shampoo composition (1) was done using paired comparison salon tests for foam, cleansing, softness of washed hair while wet, softness of hair after drying, ease of combing of dried hair and making hair manageable. The evaluations were performed by a trained, licensed cosmetologist.

Following use of the compositions, the consumers were asked to assess their hair for the above said attributes. The findings are illustrated hereunder:

Composition of the present invention (3) and composition (1) were assessed by a panel of volunteers in salon by half head method which is known to the person skilled in the art.
Following use, the consumers were asked to assess on their own hair on foam, cleansing, softness of washed hair while wet, Softness of hair after drying, ease of combing of dried hair and making hair manageable. Composition of the present invention (3), was rated significantly better in terms of softness of washed hair while wet, softness of hair after drying, ease of detangling and combing of dried hair and making hair manageable and shine compared to the composition (1).

Performance evaluation of Formulations under composition of invention and Composition (2) above:

Performance and comparisons of the composition of the present invention (3) against shampoo composition (2) was done using paired comparison salon tests for foam, cleansing, softness of washed hair while wet, softness of hair after drying, ease of combing of dried hair and making hair manageable. The evaluations were performed by a trained, licensed cosmetologist.

Following use of the compositions, the consumers were asked to assess their hair for the above said attributes. The findings are illustrated hereunder:

Composition of the present invention (3) and composition (2) were assessed by a panel of volunteers in salon by half head method which is known to the person skilled in the art.
Following use, the consumers were asked to assess on their own hair on foam, cleansing, softness of washed hair while wet, Softness of hair after drying, ease of combing of dried hair and making hair manageable. Composition of the present invention (3), was rated significantly better in terms of softness of washed hair while wet, softness of hair after drying, ease of detangling and combing of dried hair and making hair manageable and shine compared to the composition (1).

Hence, it is evident from the above compositions illustrated under known composition involving cationic guar and control compositions 1 and 2 including surfactants, insoluble non-volatile conditioning agents such as insoluble non-volatile silicone in combination with either cationic acrylamide copolymer or cationic amidoamine respectively under Table 1, that only when a synergistic combination of both the cationic acrylamide copolymer and cationic amidoamine are present together with said insoluble non-volatile silicones as insoluble non-volatile conditioning agent in the surfactant based shampoo composition as per composition 3 of the present invention, the conditioning performance of said silicones gets significantly boosted to thereby deliver superior conditioning benefits.

It is thus possible by way of the advancement made in the present invention to provide for said conditioning composition such as shampoo compositions comprising insoluble non¬volatile conditioning agents involving insoluble non-volatile silicones comprising pre-emulsified particles of said insoluble non-volatile silicones in synergistic combination with cationic acrylamide copolymer and cationic amidoamine that is found to surprisingly boost the conditioning performance of surfactant based shampoo compositions involving said insoluble non-volatile conditioning agents. It is surprisingly found by way of the technical advancement of the present invention that said insoluble non-volatile conditioning agents including said pre-emulsified silicones synergizes with the cationic acrylamide copolymer and cationic amidoamine in a mix of surfactants included in the shampoo composition to unexpectedly enhance the conditioning performance of said silicones to thereby deliver superior conditioning benefits, compatibility, softness and shine to the hair.

We Claim:

1. A shampoo composition with superior conditioning attributes comprising ingredients in addition to water (i) insoluble non-volatile conditioning agents (ii) at least one cationic acrylamide copolymer; (iii) at least one cationic amidoamine and (iv) atleast one surfactant selected from anionic, nonionic, zwitterionic or amphoteric surfactants or mixtures thereof.

2. A shampoo composition as claimed in claim 1 wherein the ratio of cationic acrylamide copolymer and cationic amidoamine varies from 1:1 to 1:5.

3. A shampoo composition with superior conditioning attributes as claimed in claim 1 wherein said ingredient (i) involving insoluble non-volatile conditioning agent includes silicones, hydrocarbon oils.

4. A shampoo composition with superior conditioning attributes as claimed in claim 3 wherein said silicones involve insoluble non-volatile silicones comprising pre-emulsified particles of said insoluble non-volatile silicones of particle size of less than 1 micron and viscosity of at least 3 lacs cps.

5. A shampoo composition as claimed in claim 4 wherein said insoluble non-volatile silicones are selected from at least one or more of polydimethylsiloxane such as dimethicone, dimethiconol or mixtures thereof.

6. A shampoo composition as claimed in any of the preceding claims wherein said cationic acrylamide copolymer are selected from the copolymers of methacrylamidopropyltrimonium chloride and / or acrylamidopropyltrimoniumchloride with acrylamide providing polymethyacrylamidopropyltrimonium chloride and acrylamidopropyltrimoniumchloride/acrylamide copolymer.

7. A shampoo composition as claimed in any of the preceding claims wherein said cationic amidoamines are selected from behenamidopropyldimethylamine, behenamidoethyldimethylamine, behenamidoethyldiethylamine, behenamidoethyldimethylamine, arachidamidopropyldimethylamine, Arachidamidoethyldiethylamine or mixtures thereof.

8. A process for manufacturing the shampoo composition as claimed in claims 1 to 7 comprising the steps of

(a) providing in addition to water said ingredients (i) insoluble non-volatile conditioning agents comprising insoluble non-volatile silicones comprising pre-emulsified particles of said insoluble non-volatile silicones of particle size of less than 1 micron and viscosity of at least 3 lacs cps (ii) at least one cationic acrylamide copolymer (iii) and at least one cationic amidoamine wherein the ratio of cationic acrylamide copolymer to cationic amidoamine is in the range of 1:1 to 1:5 (iv) at least one surfactant selected from anionic, amphoteric, non-ionic, zwitterionic; and (b) obtaining the shampoo composition therefrom.