FIELD OF THE INVENTION

The present invention relates to advancement in stable conditioning silicone emulsion formulation of silicone ingredients in specified particle size and internal oil viscosity and shampoo composition/ like compositions involving such stable conditioning pre-emulsified silicone formulation wherein said shampoo composition is adapted to deliver superior conditioning benefits, compatibility, softness and shine to the hair, and more particularly, relates to a mechanically stable shampoo composition with said improved conditioning attributes.

BACKGROUND OF THE INVENTION

The use of silicones as conditioning agents in cosmetic composition is widely documented in patent literature. 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. 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. However the conditioning delivered by the compositions using these silicones are not always acceptable to the consumers as the conditioning performance may be insufficient for many people particularly in regions such as Japan, South East Asia, India and China where consumers desire high level of conditioning.

To overcome these problems prior art literature suggests employing a combination of non-functionalized silicone and amino functionalized silicone in shampoo formulations.

Reference is drawn to US patent 5,195,209 and European patent EP0811371 that teaches a detergent and conditioning hair composition characterized such that it

includes a washing base and a system comprising a conditioner at least a cationic polymer and a mixture of at atleast a silicone aminated and at least an insoluble silicone of low or equal viscosity to 100 Pa.s different of the aforesaid silicone aminated and wherein the washing base includes one or more surface active agents selected from anionic ones, amphoteric, nonionic, cationic and their mixtures. The said conditioning shampoo is disclosed with cleansing surfactant and a combination of dimethicone and trimethylsilylamodimethicone wherein said dimethicone fluid is added directly to the shampoo composition as neat silicone oil of unspecified particle size.

WO 99/ 44565 and WO 99/44567 disclose shampoo compositions containing a combination of amino functionalized silicone and an insoluble non-amino functionalized insoluble silicone and at least one surfactant chosen from anionic, amphoteric, zwitterionic, nonionic, or mixtures thereof. In WO 99/ 44565 the emulsified non-amino functionalised silicone has an average silicon particle size in the shampoo composition of less than 2 microns. IN WO 99/ 44567 the non-amino functionalized silicone has a viscosity of atleast 5,00,000 est. In both documents the two silicone components are incorporated into the shampoo composition as separate emulsions.

US 6610280 discloses the use of an intimate blend comprising a combination of a first silicone having a viscosity of atleast 1,00,000 m.sup.2/sec and a second silicone which is functionalized can be used in hair treatment composition to provide excellent conditioning benefits further including at least one cleansing surfactant selected from anionic, amphoteric, zwitterionic surfactants and mixtures thereof and a cationic deposition polymer. The said intimate emulsion is a mechanical emulsion where in the first silicone is dimethicone and the second silicone is amino functionalized silicone. This intimate emulsion does not include non-silicone organic fluids.

Further in US patent no. 5935561 a conditioning shampoo composition is disclosed wherein the composition contains an anionic detersive surfactant component and an organic cationic conditioning polymer and a water insoluble synthetic ester and an organic water insoluble conditioning oil selected from hydrocarbon oil, fatty esters other than the synthetic esters and combination thereof. The organic conditioning oil is preferably a poly olefin wherein the composition is said to provide improved hair conditioning performance.

Indian patent application No. 1103/KOL/2007 discloses a 2-in-l cleansing and conditioning preparation comprising atleast one silicone fluid and atleast one non-silicone organic fluid where said atleast one silicone fluid and atleast one non-silicone organic fluid are contained within a single droplet. This cited art covers the usage of dimethiconol or dimethicone and a non-silicone organic fluid as intimate mixture with in a single droplet. The use of neat amino silicone oil is optional wherein the composition comprises the composition renders excellent conditioning property along with high stability, reduced build up etc.

However, the conditioning delivered involving such available formulations 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 and stable shampoo compositions to impart superior benefits to hair by way of delivering higher level of conditioning such as improved shine and softness alongwith superior compatibility.

OBJECTS OF THE INVENTION

Therefore the basic object of the present invention is to provide for a stable conditioning silicone emulsion formulation of silicone ingredients for application in cosmetic compositions preferably shampoo compositions that would be adapted to deliver superior conditioning benefits to the hair.

Another object of the present invention is to provide for the said shampoo composition involving stable conditioning silicone emulsion formulation of silicone ingredients in specified particle size and internal oil viscosity adapted to deliver superior conditioning benefits, compatibility, softness and shine to the hair.

Yet another object of the present invention is to provide for the said shampoo composition involving stable conditioning silicone emulsion formulation of silicone ingredients in specified particle size and internal oil viscosity that would be mechanically stable with said improved conditioning attributes to provide for superior overall feel to hair.

Further object of the present invention is directed to stable conditioning silicone emulsion formulation of silicone ingredients in specified particle size and internal oil viscosities adapted for use in shampoo/like compositions with superior conditioning benefits, compatibility, softness and shine to the hair, and more particularly, favouring generating a mechanically stable composition with said improved conditioning attributes.

SUMMARY OF THE INVENTION

Thus according to the basic aspects of the present invention there is provided a stable conditioning silicone emulsion formulation comprising

(a) particles of non-aminofunctionalised silicone of internal oil viscosity of atleast 60,000 with an average particle size of less than 40 micron,
(b) particles of amino-functionalised silicone having an amine number of atleast 0.005 and the internal oil viscosity of atleast 60,000 with an average particle size of less than 2 micron,
(c) an organic water insoluble hydrocarbon oil, and
(d) atleast one suspending agent.

In a preferred aspect of the present invention there is provided the said stable conditioning silicone emulsion formulation wherein the weight ratio of non-aminofunctionalised silicone to aminofunctionalised silicone is 9:1 to 1:9.

In another preferred aspect of the present invention there is provided the said stable conditioning silicone emulsion formulation wherein the non-aminofunctionalised silicone comprise those having internal oil viscosity of atleast 60,000 with an average particle size of less than 40 micron and said non-aminofunctionalised silicone can include at least one or more of polydimethylsiloxanes which have the PCPC designation as dimethicone and polydimethylsiloxanes having hydroxyl end

groups,which have the PCPC description as dimethiconol; wherein the aminofunctionalised silicone comprise those having internal oil viscosity of atleast 60,000 with the average particle size of less than 2 micron and said aminofunctionalised silicone can include at least one or more of silicones selected from polysiloxanes having the CTFA designation "amodimethicone" and the general formula OH-[Si(CH3)2-0-]x-Si(OH)(CH2CH2CH2-NH-CH2CH2NH2)-0-]y-H in which x and y are numbers depending on the molecular weight of the polymer, generally such that the molecular weight is between about 60,000 to 1 million wherein the organic water insoluble hydrocarbon oil is preferably selected from isohexadecane and/or its analogues; and wherein the suspending agent is selected from the group of at least one or more of crystalline suspending agents including glycerol stearate, acrylic acid polymers and acrylates copolymer.

In yet another preferred aspect of the present invention there is provided the said stable conditioning silicone emulsion formulation suitable for application in cosmetic compositions preferably shampoo compositions.

In another aspect of the present invention there is provided a process for manufacturing the stable conditioning silicone emulsion comprising the steps of

a) providing selectively the silicones comprising (i) pre-emulsified particles of non-aminofunctionalised silicone of internal oil viscosity of atleast 60,000 with the average particle size of less than 40 micron, and (ii) pre-emulsified particles of amino-functionalised silicone involving an amine number of atleast 0.005 and internal oil viscosity of atleast 60,000 with an average particle size of less than 2 micron; and involving a selective weight ratio of non-aminofunctionalised silicone to aminofunctionalised silicone in the range of 9:1 to 1:9;
(b) mixing at least one suspending agent; and
(c) adding an organic water insoluble hydrocarbon oil to the above mixture to obtain the said pre-emulsified formulation of silicone ingredients therefrom.

In yet another aspect of the present invention there is provided a shampoo composition with superior conditioning attributes comprising

(i) cationic polymer;

(ii) surfactant selected from anionic, amphoteric and non-ionic surfactants and/or mixtures thereof;

(iii) stable conditioning pre-emulsified silicone formulation comprising of (a) pre-emulsified particles of non-aminofunctionalised silicone of internal oil viscosity of atleast 60,000 with an average particle size of less than 40 micron, (b) pre-emulsified particles of amino-functionalised silicone involving an amine number of atleast 0.005 and the internal oil viscosity of atleast 60,000 with an average particle size of less than 2 micron and wherein the non-aminofunctionalised silicone and aminofunctionalised silicone are present in the selective weight ratio ranging of from 9:1 to 1:9, (c) an organic water insoluble hydrocarbon oil and (d) atleast one suspending agent.

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

(i) providing at least one cationic polymer,

(ii) providing surfactant selected from at least one or more of anionic, amphoteric and non-ionic,

(iii) providing stable conditioning pre-emulsified silicone formulation comprising (a) pre-emulsified particles of non-aminofunctionalised silicone of internal oil viscosity of atleast 60,000 with the average particle size of less than 40 micron, and (b) pre-emulsified particles of amino-functionalised silicone involving an amine number of atleast 0.005 and internal oil viscosity of atleast 60,000 with an average particle size of less than 2 micron; and involving a selective weight ratio of non-aminofunctionalised silicone to aminofunctionalised silicone in the range of 9:1 to 1:9, (c) an organic water insoluble hydrocarbon oil and (d) atleast one suspending agent; and obtaining the shampoo composition therefrom.

It is thus the selective finding of the present invention that the conditioning performance of a stable conditioning silicone emulsion formulation in a surfactant included in the shampoo composition can be significantly boosted by inclusion of said silicone emulsion formulation comprising emulsified particles of amino functionalized silicone, an insoluble non-amino functionalized silicone when present in combination with a hydrocarbon oil preferably isohexadecane and or its analogues in the shampoo composition.

Importantly, it is yet another finding of the present invention wherein the presence of the specified particle size with increased particle stability of the silicones included in the said stable conditioning silicone emulsion formulation further constituting the shampoo composition is warranted by the presence of a suspending agent present in the said formulation.

DETAILED DESCRIPTION OF THE INVENTION

As described hereinbefore the present invention provides for a stable conditioning silicone emulsion formulation comprising silicone ingredients in specified particle size and internal oil viscosity in combination with water insoluble hydrocarbon oil and suspending agent for application/ use in silicone based formulations such as shampoo compositions.

According to another aspect of the invention there is provided an improved shampoo composition comprising the said stable conditioning silicone emulsion formulation of emulsified silicone ingredients in specified particle size and internal oil viscosity in combination with water insoluble hydrocarbon oil and suspending agent adapted to deliver superior conditioning benefits, compatibility, softness and shine to the hair, and more particularly, relates to a mechanically stable composition with said improved conditioning attributes.

In one aspect of the present invention the shampoo composition comprises a cationic polymer, surfactant selected from anionic, amphoteric and non-ionic surfactants and/or mixtures thereof, stable conditioning pre-emulsified silicone formulation of silicone ingredients comprising (i) pre-emulsified particles of non-aminofunctionalised silicone of internal oil viscosity of atleast 60,000 wherein the average particle size is less than 40 micron and (ii) pre-emulsified particles of amino-functionalised silicone having an amine number of atleast 0.005 and the internal oil viscosity of atleast 60,000 wherein the average particle size is less than 2 micron wherein the weight ratio of non-aminofunctionalised silicone to aminofunctionalised silicone is 9:1 to 1:9 and (iii) an organic water insoluble hydrocarbon oil preferably isohexadecane and/or its analogues and (iv) atleast one suspending agent.

In another aspect of the present invention there is provided a process for manufacturing the stable conditioning silicone emulsion comprising the steps of providing selectively the silicone ingredients comprising

(i) pre-emulsified particles of non-aminofunctionalised silicone of internal oil viscosity of atleast 60,000 with an average particle size of less than 40 micron;

(ii) pre-emulsified particles of amino-functionalised silicone having an amine number of atleast 0.005 and the internal oil viscosity of atleast 60,000 with an average particle size of less than 2 micron and wherein the weight ratio of non-aminofunctionalised silicone to aminofunctionalised silicone is 9:1 to 1:9; and

(iii) at least one suspending agent; and

(iv) an organic water insoluble hydrocarbon oil preferably isohexadecane and/or its analogues to obtain the said pre-emulsified formulation of silicone ingredients therefrom.

According to a further aspect of the invention there is provided a process for manufacturing a shampoo composition comprising the steps of (i) providing at least one cationic polymer, (ii) providing surfactant selected from anionic, amphoteric and non-ionic surfactants and/or mixtures thereof, (iii) providing stable conditioning pre-emulsified silicone formulation obtained selectively of (a) pre-emulsified particles of non-aminofunctionalised silicone of internal oil viscosity of atleast 60,000 where in the average particle size is less than 40 micron and (b) pre-emulsified particles of amino-functionalised silicone having an amine number of atleast 0.005 and the internal oil viscosity of atleast 60,000 wherein the average particle size is less than 2 micron wherein the weight ratio of non-aminofunctionalised silicone to aminofunctionalised silicone is 9:1 to 1:9 and (c) an organic water insoluble hydrocarbon oil preferably isohexa decane and/or its analogues and (d) atleast one suspending agent; and obtaining the said shampoo composition therefrom.

The shampoo composition obtained as above is adapted to deliver superior conditioning benefits, compatibility, softness and shine to the hair thereby significantly boosting conditioning performance of pre-emulsified silicone in a surfactant in the said composition.

The invention is illustrated hereunder in greater detail in relation to the following non-limiting exemplary illustrations as per the following examples:

Example 1: Control shampoo composition

1) amino functionalised silicone included is DC 949 from Dowcorning Ltd, an emulsion (35% Active ingredient) of amodimethicone in cationic surfactant (cetrimonium chloride) and non-ionic surfactant (Trideceth-12) having an amine
number of 0.125 and the internal oil viscosity of 2000 est and particle size of 250 nm
2) Non-aminofunctionalised silicone included is DC 1310 BB from Dowcorning Ltd, an emulsion (60% active ingredient) with internal oil viscosity of 60,000 est where in the average particle size is 10 micron
(3) Aqua SF-1 is a cross linked acrylate copolymer from Lubrizol
(4) Jaguar C13S is Guar hydroxypropyltriammoniumchloride from Rhodia
(5) Kathon CG is a preservative available from Rohm & Haas

1) amino functionalised silicone included is an emulsion having an amine number of 0.018 and the internal oil viscosity of 0.2 million est with the average particle size of 0.35 micron
2) Non-aminofunctionalised silicone included is an emulsion with internal oil viscosity of 0.5 million cst with the particle size of 30 micron
(3) Aqua SF-1 is a cross linked acrylate copolymer from Lubrizol
(4) Jaguar C13S is Guar hydroxypropyltriammoniumchloride from Rhodia
(5) Kathon CG is a preservative available from Rohm& Haas

Performance evaluation of Formulations under Examples 1 and 2 above:

Performance and comparisons of the composition of the present invention illustrated in Example 2 against composition of example 1 which is Control 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 illustrated in Example 2 and Example 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-illustrated in Example 2, was preferred on 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 described in Example 1.

Hence, it is evident from the above compositions illustrated under control example 1 including the pre-emulsified silicone particles not in accordance with the present invention in combination with the hydrocarbon oil and example 2 including the composition according to the present invention involving the emulsified formulation of silicone particles with desired particle size and internal oil viscosity in combination with isohexadecane as an essential ingredient in the shampoo composition thus significantly boosts the performance of the composition in delivering superior conditioning benefits to the hair.

It is thus possible by way of the technical advancement made by way of the present invention to provide for a stable conditioning silicone emulsion comprising silicone ingredients of amino and non-amino functionalized silicones in selective particle size and internal oil viscosities in combination with water insoluble hydrocarbon oil and suspending agent and a shampoo composition involving the same with superior conditioning benefits, which on one hand is adapted to deliver superior conditioning benefits, compatibility, softness and shine to the hair, and on the other hand is a mechanically stable composition imparting said improved conditioning attributes.

We Claim:

1. A stable conditioning silicone emulsion formulation comprising

(a) particles of non-aminofunctionalised silicone of internal oil viscosity of atleast 60,000 with an average particle size of less than 40 micron,
(b) particles of amino-functionalised silicone having an amine number of atleast 0.005 and the internal oil viscosity of atleast 60,000 with an average particle size of less than 2 micron,
(c) an organic water insoluble hydrocarbon oil, and
(d) atleast one suspending agent.

2. A stable conditioning silicone emulsion formulation as claimed in claim 1 wherein the weight ratio of non-aminofunctionalised silicone to aminofunctionalised silicone is 9:1 to 1:9.

3. A stable conditioning silicone emulsion formulation as claimed in anyone of claims 1 or 2 wherein the non-aminofunctionalised silicone comprise those having internal oil viscosity of atleast 60,000 with an average particle size of less than 40 micron and said non-aminofunctionalised silicone can include at least one or more of polydimethylsiloxanes which have the PCPC designation as dimethicone and polydimethylsiloxanes having hydroxyl end groups,which have the PCPC description as dimethiconol ; wherein the aminofunctionalised silicone comprise those having internal oil viscosity of atleast 60,000 with the average particle size of less than 2 micron and said aminofunctionalised silicone can include at least one or more of silicones selected from polysiloxanes having the CTFA designation "amodimethicone" and the general formula OH-[Si(CH3)2-0-]x-Si(OH)(CH2CH2CH2-NH-CH2CH2NH2)-0-]y-H in which x and y are numbers depending on the molecular weight of the polymer, generally such that the molecular weight is between about 60,000 to 1 million wherein the organic water insoluble hydrocarbon oil is preferably selected from isohexadecane and/or its analogues; and wherein the suspending agent is selected from the group of at least one or more of crystalline suspending agents including glycerol stearate, acrylic acid polymers and acrylates copolymer.

4. A stable conditioning silicone emulsion formulation as claimed in any of the preceding claims suitable for application in cosmetic compositions preferably shampoo compositions.

5. A process for manufacturing the stable conditioning silicone emulsion as claimed in anyone of claims 1-4 comprising the steps of

a) providing selectively the silicones comprising (i) pre-emulsified particles of non-aminofunctionalised silicone of internal oil viscosity of atleast 60,000 with the average particle size of less than 40 micron, and (ii) pre-emulsified particles of amino-functionalised silicone involving an amine number of atleast 0.005 and internal oil viscosity of atleast 60,000 with an average particle size of less than 2 micron; and involving a selective weight ratio of non-aminofunctionalised silicone to aminofunctionalised silicone in the range of 9:1 to 1:9;
(b) mixing at least one suspending agent; and
(c) adding an organic water insoluble hydrocarbon oil to the above mixture to obtain the said pre-emulsified formulation of silicone ingredients therefrom.

6. A shampoo composition with superior conditioning attributes comprising
(i) cationic polymer;

(ii) surfactant selected from anionic, amphoteric and non-ionic surfactants and/or mixtures thereof;

(iii) stable conditioning pre-emulsified silicone formulation comprising of (a) pre-emulsified particles of non-aminofunctionalised silicone of internal oil viscosity of atleast 60,000 with an average particle size of less than 40 micron, (b) pre-emulsified particles of amino-functionalised silicone involving an amine number of atleast 0.005 and the internal oil viscosity of atleast 60,000 with an average particle size of less than 2 micron and wherein the non-aminofunctionalised silicone and aminofunctionalised silicone are present in the selective weight ratio ranging of from 9:1 to 1:9, (c) an organic water insoluble hydrocarbon oil and (d) atleast one suspending agent.

7. A process for manufacturing the shampoo composition as claimed in claim 6
comprising the steps of
(i) providing at least one cationic polymer,
(ii) providing surfactant selected from at least one or more of anionic, amphoteric and non-ionic,
(iii) providing stable conditioning pre-emulsified silicone formulation comprising (a) pre-emulsified particles of non-aminofunctionalised silicone of internal oil viscosity of atleast 60,000 with the average particle size of less than 40 micron, and (b) pre-emulsified particles of amino-functionalised silicone involving an amine number of atleast 0.005 and internal oil viscosity of atleast 60,000 with an average particle size of less than 2 micron; and involving a selective weight ratio of non-aminofunctionalised silicone to aminofunctionalised silicone in the range of 9:1 to 1:9, (c) an organic water insoluble hydrocarbon oil and (d) atleast one suspending agent; and obtaining the shampoo composition therefrom.

8. A stable conditioning silicone emulsion formulation, a shampoo composition obtained thereof and a process for preparing the same as hereindescribed and illustrated in relation to the accompanying examples.