DESC:TECHNICAL FIELD
The present disclosure relates to a hair oil formulation comprising: a) a hair oil; b) a polymer of 12-hydroxy octadecanoic acid. The hair oil formulation of the present disclosure having improved hair sensory effect due to a synergistic effect of polymer of 12-hydroxy octadecanoic acid and hair oil.

BACKGROUND
Hair oiling is one of the routine regimes for various benefits. The numerous hair oil formulations in market provides benefits like nourishing, strengthening, shining likewise. However, the challenge is to provide more sensorial acceptable hair oil, keeping the least ingredients in the formulation.
A hair oil formulation typically comprises source of oil which can be vegetable or mineral oil, perfume, preservatives, coloring agents, thickeners, etc. which are reported in the prior art as follows:

US 2010/0203003 A1 discloses the use of ester oils, aromatic alcohols, plant oils and silicone oil for improving the hair strength. The use of conventional ester oils such as diethoxy ethyl succinate is not satisfactory from the viewpoint of improvement of hair strength. In addition, there is a problem of deteriorated storage stability. Aromatic alcohols such as benzyl alcohol have been used as a penetration-enhancing agent for oil agents. When aromatic alcohols are used as a penetration-enhancing agent, there is a problem of odour and safety. Plant oils when used alone as an ingredient of hair cosmetic materials, have uncomfortable stickiness that accompanies upon its application to hair. Silicone oil is also used to impart a refreshing finish to the hair.

JP 2008-174496 discloses a hair cosmetic material formulated with dimethyl polysiloxane and a hydrocarbon oil to improve the effects of care for damaged hair.

US4224212A discloses a dispersing agent comprising the reaction product of a poly(lower alkylene)imine with a polyester having a free carboxylic acid group, in which there are at least two polyester chains attached to each poly(lower alkylene)imine chain, the number average molecular weight of the polyester being in the range of 5600 to 560 and the molecular weight of the poly(lower alkylene)imine being such that it has a viscosity measured at 25 ºC as a 25% solution in water in the range of 9.3 to 2780 centipoises. US4224212A discloses synthesis of polyester 12-hydroxy stearic acid.

Further, synthesis of polyester 12-hydroxy stearic acid was also disclosed in example 1 of EP2818237 by using 12-hydroxy-octadecanoic acid (12-hydroxystearic acid) and xylene as mentioned in scheme 1. It is observed from the prior arts that the Polyhydroxy stearic acid is majorly used as surfactant and dispersant and for water based applications.

However, researchers of the present disclosure, while formulating hair oil formulation, unexpectedly found better hair sensory, using polymer of 12-hydroxyoctadecanoic acid in a hair oil formulation. None of the prior-art discloses use of polymer of 12-hydroxy octadecanoic acid in a hair oil for improving the sensorial benefit.
SUMMARY
The present disclosure relates to a hair oil formulation comprising: a) a hair oil; and b) a polymer of 12-hydroxy octadecanoic acid.

These and other features, aspects, and advantages of the present subject matter will become better understood with reference to the following description. This summary is provided to introduce a selection of concepts in a simplified form. This summary is not intended to identify key features or essential features of the subject matter, nor is it intended to be used to limit the scope of the subject matter.

BRIEF DESCRIPTION OF ACCOMPANYING DRAWINGS

The above and other features, aspects, and advantages of the subject matter will be better understood with regard to the following description, and accompanying drawings where:

Figure 1 provides Post wash conditioning rating (sensory) from trained panelist.

DESCRIPTION OF THE INVENTION
The present disclosure provides a hair oil formulation comprising: a) a hair oil; and b) a polymer of 12-hydroxy octadecanoic acid.

An estolide is a long chain esters, formed from the condensation of two fatty acids. The polymer of 12-hydroxy octadecanoic acid is estolide derived from hydrogenated castor oil. The polymer of 12-hydroxy octadecanoic acid has a degree of polymerization in the range of 2-10.
In an embodiment of the present disclosure the polymer of 12-hydroxy octadecanoic acid to hair oil ratio is in the range of 0.005 to 0.5. The polymer of 12-hydroxy octadecanoic acid is present in the range of 0.01 to 10 % w/w, preferably in the range of 0.4 to 10 % w/w.
The hair oil is selected from the group consisting of vegetable oil, mineral oil and silicone oil or mixtures thereof. The vegetable oil is selected from the group consisting of coconut oil, sunflower oil, mustard oil, sesame oil, rice bran oil, canola oil and castor oil or combinations thereof. The mineral oil is liquid paraffin. The silicon oil is selected from the group consisting of cyclomethiocone or oil dissolving silicone polymer. All ingredients are commercially available, and are easy to procure.
The formulation also contains an excipient which is selected from the group consisting of vegetable oil, colour, antioxidant, fragrance and herbal extract oil or combinations thereof. The formulation may contain antioxidant which is selected from the group consisting of tocopherol or vitamin E, propyl gallate, octyl gallate and oryzanol or combinations thereof. The antioxidant is present in the range of 0.001 to 2 % w/w.
The formulation has viscosity in the range of 10 to 50 cst at 37 ºC, preferably in the range of 15 to 35 cst at 37 ºC measured by using ostwald’s viscometer.
According to another embodiment, the composition can be evaluated for sensorial panel ratings for hair conditioning and skin texture.

Examples
The following examples are given by way of illustration of the present disclosure and should not be construed to limit the scope of present disclosure. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are intended to provide further explanation of the subject matter.

Example 1
Formulation details:
The following examples illustrate the versatility of the present disclosure. The unit of each value below is unless otherwise specified. To assess the hair sensory effect of the formulations of the present disclosure, following exemplary formulations are prepared:

Ingredients F1 F2 F3 F4 F5 F6 F7
Sunflower oil 20 20 20 20 20 20 0
Refined Mustard Oil 0 0 0 0 0 0 15
Refined Rice Bran Oil 0 0 0 0 0 0 20
Polymer of 12-hydroxy octadecanoic acid (estolide of castor oil) 0 0.1 0.4 1.0 5.0 10 0.4
Mineral oil 79 78.9 78.6 78 74 69 78.6
Other Excipients
(Perfume, Antioxidant etc.) 1 1 1 1 1 1 1
Property
Viscosity in cst 18.5 19.1 19.9 20.8 24.4 30.7 -
Ratio (Polymer of 12-hydroxy octadecanoic acid: Oil) 0 0.005 0.02 0.05 0.25 0.5 0.011
Example 2
Hair Sensory Analysis:
Black hair tresses are taken having 20-22 cm length and 10 g weight each. Wash hair tresses with 15% SLES solution (10% w/w of Hair swatch), followed by cold drying. Make five sets of swatches for six product treatment (F1, F2, F3, F4, F5, and F6). Apply test product on dry hair swatches evenly (10% w/w of Hair swatch). Keep it for 6 hr. under ambient condition. Wash all swatches with 15% SLES solution (10% w/w of Hair swatch) followed by cold drying. Repeat cycles from step 1 to 6 for 5 times. Take post wash conditioning rating (sensory) from trained panelist (Fig. 1). Formulation F1 does not contain polymer of 12-hydroxy octadecanoic acid, which is used as a control, has post wash conditioning value of 2.6 as shown in Fig. 1 whereas formulation F2-F6 contain 0.1, 0.4, 1.0, 5.0 and 10 % polymer of 12-hydroxy octadecanoic acid having post wash conditioning value of 2.9, 3.1, 3.3, 3.9 and 4.5 respectively. Thus, it is observed from the Fig. 1 that post wash conditioning value increases as the concentration of polymer of 12-hydroxy octadecanoic acid increases in the formulation. The desired sensory is in the range of 2.9 to 4.5.

Example 3
Deposition study protocol
F3 formulation has been used for deposition study using HPLC. First estolide was extracted from Hair samples [(treated with formulation containing Estolide, without Estolide and Control Hair sample (without any product treatment)]. Extraction was done in ethyl acetate, soaked for 10 minutes followed by sonication for 15-20 min. After the sonication hair was removed and evaporate the solvent for dryness, reconstitute with ethyl acetate and acetone (3:1 ratio) and fill in vial. This solution was finally subject into HPLC study (Mobile phase: Solvent A – acetonitrile, Solvent B- acetone). Peak area of Pure Estolide sample and Extracts (of Hair sample treated with product) was compared and deposition was quantified. According to detailed analysis, 6.3% of estolide is deposited on hair strands. Therefore, it is confirmed that the polymer of 12-hydroxy octadecanoic acid in hair oil formulation provides very good sensory, since it deposits on hair strands.

Although the subject matter has been described in considerable detail with reference to certain preferred embodiments thereof, other embodiments are possible. As such, the spirit and scope of the subject matter should not be limited to the description of the preferred embodiment contained therein. ,CLAIMS:We claim:
1. A hair oil formulation comprising:
a) a hair oil; and
b) a polymer of 12-hydroxy octadecanoic acid;

2. The formulation as claimed in claim 1, wherein the polymer of 12-hydroxy octadecanoic acid to hair oil ratio is in the range of 0.005 to 0.5.
3. The formulation as claimed in claim 1, wherein the polymer of 12-hydroxy octadecanoic acid is estolide derived from hydrogenated castor oil.
4. The formulation as claimed in claim 1, wherein the polymer of 12-hydroxy octadecanoic acid has a degree of polymerization in the range of 2-10.
5. The formulation as claimed in claim 1, wherein the polymer of 12-hydroxy octadecanoic acid is present in the range of 0.01 to 10 % w/w.
6. The formulation as claimed in claim 1, wherein the polymer of 12-hydroxy octadecanoic acid is present in the range of 0.4 to 10 % w/w.
7. The formulation as claimed in claim 1, wherein the hair oil is selected from the group consisting of vegetable oil, mineral oil and silicone oil or mixtures thereof.
8. The formulation as claimed in claim 7, wherein the vegetable oil is selected from the group consisting of coconut oil, sunflower oil, mustard oil, sesame oil, rice bran oil, canola oil and castor oil or combinations thereof.
9. The formulation as claimed in claim 7, wherein the mineral oil is liquid paraffin.
10. The formulation as claimed in claim 7, wherein the silicon oil is selected from the group consisting of cyclomethiocone or oil dissolving silicone polymer.
11. The formulation as claimed in claim 1, wherein the formulation also contains an excipient which is selected from the group consisting of vegetable oil, colour, antioxidant, fragrance and herbal extract oil or combinations thereof.
12. The formulation as claimed in claim 1, wherein the formulation has viscosity in the range of 10 to 50 cst.