A rinse-off formulation providing hydration to the skin

Abstract

A rinse-off formulations comprising: a free fatty acid blend in an amount of 0.1 to 3.0% w / w; and one or more surfactants. The free fatty acid blend exhibits iodine value ranging between 110 and 135 / 100g. The rinse-off formulation also comprises glycerine, preferably, in an amount ranging from 3 to 12% w / w. The rinse-off formulation affords enhanced hydration to skin, without compromising with characteristics such as lather profile and wash off characteristics.

Description

A RINSE-OFF FORMULATION PROVIDING HYDRATION TO THE SKINFIELD OF THE INVENTION

[0001] The present disclosure relates generally to the field of cleanser formulations. Particularly, the present disclosure relates to a rinse-off formulation providing enhanced hydration to the skin without compromising other characteristics of the formulation.BACKGROUND OF THE INVENTION

[0002] Background description includes information that may be useful in understanding the present invention. It is not an admission that any information provided herein is prior art or relevant to the presently claimed invention, or that any publication specifically or implicitly referenced is prior art.

[0003] Cleansers are products that one uses in their daily life to remove the normal accumulation of dirt and oils, remains of pollution, and the like. They are advantageous as can be applied directly to surfaces so that a relatively high concentration of cleanser is delivered directly to the application area. However, such cleansers suffer from several drawbacks, most importantly, depleting the skin oils causing dehydration of the skin.

[0004] To improve the hydration effect of the products, several types of emollients are known in the art, addition whereof ameliorates the loss in moisturization and sensorial feel. However, addition of these emollients (ingredients) impacts product characteristics such as lather profile, reduced wash-off characteristics, and the like.

[0005] Therefore, it is desirable to develop a new and improved formulation that exhibits the hydration effect, without compromising the other requisite characteristics such as lather profile, reduced wash-off characteristics, and the like of the formulations. The present invention satisfies the existing needs, as well as others, and generally overcomes the deficiencies found in the prior art.OBJECTS

[0006] The primary object of the present invention is to provide a rinse-off formulation that may overcome one or more limitations associated with conventional cleansing formulations.

[0007] It is an object of the present disclosure to provide a rinse-off formulation that provides desired hydration to the body / skin.

[0008] It is an object of the present disclosure to provide a rinse-off formulation that is stable.

[0009] It is an object of the present disclosure to provide a rinse-off formulation that is easy to prepare and economical.SUMMARY

[0010] The present disclosure relates generally to the field of cleanser formulations. Particularly, the present disclosure relates to a rinse-off formulation providing enhanced hydration to the skin without compromising other characteristics of the formulation. The addition of a free fatty acid blend along with surfactants show a synergistic interaction resulting in significant enhancements hydration, surface finish, and lather quality of the formulation. This formulation thus eliminates need for additional ingredients that could negatively impact other properties of the product.

[0011] An aspect of the present disclosure provides a rinse-off formulation comprising: a free fatty acid blend in an amount of 0.2 to 3.0% w / w; preferably in an amount of 1 to 3.0% w / w, wherein said free fatty acid blend may exhibit iodine value ranging between 110 and 135 / 100g; and one or more surfactants in an amount ranging from 20 to 45% w / w.

[0012] In some embodiments, the rinse-off formulation also comprises glycerine. In some embodiments, the glycerine is present in an amount ranging from 1 to 12% w / w.

[0013] An aspect of the present disclosure provides a solid rinse-off formulation comprising: a free fatty acid blend in an amount of 0.2 to 3.0% w / w; preferably in an amount of 1 to 3.0% w / w, wherein said free fatty acid blend may exhibit iodine value ranging between 110 and 135 / 100g; and one or more surfactants in an amount ranging from 20 to 45% w / w.

[0014] In some embodiments, the free fatty acid blend exhibits iodine values ranging between 120 and 130 / 100g. In some embodiments, the free fatty acid blend comprises fatty acids selected from stearic acid, myristic acid, palmitic acid, linoleic acid, linolenic acid, oleic acid, and mixtures thereof. In some embodiments, the free fatty acid blend comprises at least two unsaturated fatty acid(s) having alkyl chain length between C14 and C22 in an amount of more than 60% w / w, and preferably between 75-90% w / w of the free fatty acid blend. In some embodiments, the free fatty acid blend comprises: palmitic acid in an amount ranging from 5-15 % w / w; stearic acid in an amount ranging from 3-10 % w / w; oleic acid in an amount ranging from 20-40 % w / w; linoleic acid in an amount ranging from 30-60 % w / w; and a-Linolenic acid in an amount ranging from 1-10 % w / w.

[0015] In some embodiments, the one or more surfactants comprises at least one anionic surfactant. In some embodiments, the at least one anionic surfactant is selected from alkyl sulfate, alkyl ether sulfate, alpha olefin sulphonate, salts of fatty acids, monoalkyl phosphate, amino acid based surfactant, acyl isethionate and combinations thereof. In some embodiments, the ratio of the fatty acid blend to the at least one anionic surfactant ranges from 0.004 to 0.15; preferably ranging fromO.004 to 0.4

[0016] Another aspect of the present disclosure provides a liquid rinse-off formulation comprising: a free fatty acid blend in an amount of 0.2 to 3.0% w / w; preferably in an amount of 1 to 3.0% w / w, said free fatty acid blend exhibiting iodine value ranging between 110 and 135 / 100g; and one or more surfactants in an amount ranging from 5 to 20 % w / w.

[0017] In some embodiments, the free fatty acid blend exhibits iodine values ranging between 120 and 130 / 100g. In some embodiments, the free fatty acid blend comprises fatty acids selected from stearic acid, myristic acid, palmitic acid, linoleic acid, linolenic acid, oleic acid and combinations thereof. In some embodiments, the free fatty acid blend comprises at least two unsaturated fatty acid(s) having alkyl chain length between C14 and C22 in an amount of more than 60% w / w, and preferably between 75-90% w / w of the free fatty acid blend. In some embodiments, the free fatty acid blend comprises: palmitic acid in an amount ranging from 5-15 % w / w; stearic acid in an amount ranging from 3-10 % w / w; oleic acid in an amount ranging from 20-40 % w / w; linoleic acid in an amount ranging from 30-60 % w / w; and a-Linolenic acid in an amount ranging from 1-10 % w / w.

[0018] In some embodiments, the one or more surfactants comprises at least one anionic surfactant. In some embodiments, the at least one anionic surfactant is selected from alkyl sulfate, alkyl ether sulfate, alpha olefin sulphonate, salts of fatty acids, monoalkyl phosphate, amino acid based surfactant, acyl isethionate and combinations thereof. In some embodiments, the at least one anionic surfactant is selected from sodium lauryl ether sulfate 1EO (SLES 1EO) and sodium lauryl sulfate (SLS). In some embodiments, the ratio of the fatty acid blend to the at least one anionic surfactant ranges from 0.025 to 0.4.

[0019] Other aspects, advantages, and salient features of the invention will become apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the exemplary embodiments of the invention.DETAILED DESCRIPTION OF THE INVENTION

[0020] The embodiments herein and the various features and advantageous details thereof are explained more comprehensively with reference to the non-limiting embodiments that aredetailed in the following description. Descriptions of well-known components and processing techniques are omitted to not unnecessarily obscure the embodiments herein. The examples used herein are intended merely to facilitate an understanding of the ways in which the embodiments herein may be practiced and to further enable those of skills in the art to practice the embodiments herein. Accordingly, the examples should not be construed as limiting the scope of the embodiments herein.

[0021] Unless otherwise specified, all terms used in disclosing the invention, including technical and scientific terms, have the meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. By means of further guidance, term definitions may be included to better appreciate the teaching of the present invention.

[0022] As used in the description herein, the meaning of “a,” “an,” and “the” includes plural reference unless the context clearly dictates otherwise. Also, as used in the description herein, the meaning of “in” includes “in” and “on” unless the context clearly dictates otherwise.

[0023] As used herein, the terms “comprise”, “comprises”, “comprising”, “include”, “includes”, and “including” are meant to be non-limiting, i.e., other steps and other ingredients which do not affect the end of result can be added. The above terms encompass the terms “consisting of’ and “consisting essentially of’.

[0024] As used herein, the terms “composition”, “blend”, or “mixture” are all intended to be used interchangeably.

[0025] The terms “weight percent”, “percent by weight”, “% by weight”, “%w / w” and variations thereof, as used herein, refer to the concentration of a substance as the weight of that substance divided by the total weight of the formulation and multiplied by 100. It is understood that, as used here, “percent”, “%”, and the like are intended to be synonymous with “weight percent”, “%w / w”, etc.

[0026] The term “iodine value”, as used herein, refers to the measurement of the unsaturation of fats and oils by any standard method such as, and preferably by, Wijs method known in the state of the art. It is expressed as the number of grams of iodine absorbed per 100 gram of the test sample.

[0027] The hydration of the skin is measured by a commercially available device, Comeometer®. The device measures the hydration level of the stratum comeum, the outermost layer of the skin. It works simply by placing the device probe on the skin, sending a weak electrical current through the skin, and measuring the capacitance (as dielectric constant), which indicates the skin’s hydration level. Specifically, it measures the dielectric constant of the stratum Comeum layer of the skin which changes with water content. Thechange in the dielectric value is converted into units of hydration. The expression “% improvement in hydration” as used herein, throughout the present disclosure, denotes the improvement in hydration of skin, which was measured by: measuring the hydration value of skin on forearm of a user before washing with the formulation, said value denoted as “X”; measuring the hydration value on skin of forearm of a user after washing with the formulation, said value denoted by “Y”; % improvement in hydration = (Y - X) / X * 100.

[0028] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood to one of ordinary skill in the art to which this disclosure belongs. Although methods and materials similar or equivalent to those described herein can be used in the practice or testing of the disclosure, the preferred methods, and materials are now described.

[0029] The present disclosure is not to be limited in scope by the specific embodiments described herein, which are intended for the purposes of exemplification only. Functionally equivalent products, formulations, compositions, and methods are clearly within the scope of the disclosure, as described herein

[0030] The recitation of ranges of values herein is merely intended to serve as a shorthand method of referring individually to each separate value falling within the range. Unless otherwise indicated herein, each individual value is incorporated into the specification as if it were individually recited herein.

[0031] The headings and abstract of the invention provided herein are for convenience only and do not interpret the scope or meaning of the embodiments.

[0032] The following discussion provides many example embodiments of the inventive subject matter. Although each embodiment represents a single combination of inventive elements, the inventive subject matter is considered to include all possible combinations of the disclosed elements. Thus, if one embodiment comprises elements A, B, and C, and a second embodiment comprises elements B and D, then the inventive subject matter is also considered to include other remaining combinations of A, B, C, or D, even if not explicitly disclosed.

[0033] The present disclosure relates generally to the field of cleanser formulations. Particularly, the present disclosure relates to a rinse-off formulation providing enhanced hydration to the skin without compromising other characteristics of the formulation.

[0034] The present disclosure is on the premise of a surprising observation by inventors of the instant application that free fatty acid blend comprising unsaturated free fatty acid(s) exhibits functional reciprocity with surfactants affording rinse-off formulations withenhanced hydration to skin, without deteriorating desired product characteristics such as lather profile and wash off characteristics. Particularly, it was surprising to note that incorporation of a small amount of free fatty acid blend (e.g. in an amount of 1 to 3.0% w / w) having an iodine value of 110 to 135 / 100g in rinse-off formulations affords dramatic improvement in hydration of skin owing to functional reciprocity between the free fatty acid blend and the surfactant. In preferred embodiments, the free fatty acid blend comprises fatty acids having an alkyl chain length ranging between C14 and C’22.

[0035] Accordingly, an aspect of the present disclosure provides a solid rinse-off formulation comprising: a free fatty acid blend in an amount of 1 to 3.0% w / w, said free fatty acid blend exhibiting iodine value ranging between 110 and 135 / 100g; and one or more surfactants in an amount ranging from 20 to 45% w / w.

[0036] In some embodiments, the rinse-off formulation also comprises glycerine. In some embodiments, the glycerine is present in an amount ranging from 1 to 12% w / w.

[0037] In some embodiments, the free fatty acid blend exhibits iodine values ranging between 120 and 130 / 100g. In some embodiments, the free fatty acid blend comprises fatty acids selected from stearic acid, myristic acid, palmitic acid, linoleic acid, linolenic acid, oleic acid, and combinations thereof. In some embodiments, the free fatty acid blend comprises at least two unsaturated fatty acid(s) having alkyl chain length between C14 and C22 in an amount of more than 60% w / w, and preferably between 75-90% w / w of the free fatty acid blend. In some embodiments, the free fatty acid blend comprises: palmitic acid in an amount ranging from 5-15 % w / w; stearic acid in an amount ranging from 3-10 % w / w; oleic acid in an amount ranging from 20-40 % w / w; linoleic acid in an amount ranging from 30-60 % w / w; and a-Linolenic acid in an amount ranging from 1-10 % w / w.

[0038] In some embodiments, the one or more surfactants comprises at least one anionic surfactant. In some embodiments, the at least one anionic surfactant is selected from alkyl sulfate, alkyl ether sulfate, alpha olefin sulphonate, salts of fatty acids, monoalkyl phosphate, amino acid based surfactant, acyl isethionate and combinations thereof. In some embodiments, the at least one anionic surfactant is selected from sodium lauryl ether sulfate 1EO (SLES 1EO) and sodium lauryl sulfate (SLS). In some embodiments, the ratio of the fatty acid blend to the at least one anionic surfactant ranges from 0.004 to 0.15, more particularly, between 0.022 and 0.1.

[0039] Another aspect of the present disclosure provides a liquid rinse-off formulation comprising: a free fatty acid blend in an amount of 0. 1 to 3.0% w / w, said free fatty acid blendexhibiting iodine value ranging between 110 and 135 / 100g; and one or more surfactants in an amount ranging from 5 to 20% w / w.

[0040] In some embodiments, the free fatty acid blend exhibits iodine values ranging between 120 and 130 / 100g. In some embodiments, the free fatty acid blend comprises fatty acids selected from stearic acid, palmitic acid, myristic acid, linoleic acid, linolenic acid, oleic acid, and combinations thereof. In some embodiments, the free fatty acid blend comprises at least two unsaturated fatty acid(s) having alkyl chain length between C14 and C22 in an amount of more than 60% w / w, and preferably between 75-90% w / w of the free fatty acid blend. In some embodiments, the free fatty acid blend comprises: palmitic acid in an amount ranging from 5-15 % w / w; stearic acid in an amount ranging from 3-10 % w / w; oleic acid in an amount ranging from 20-40 % w / w; linoleic acid in an amount ranging from 30-60 % w / w; and a-Linolenic acid in an amount ranging from 1-10 % w / w.

[0041] In some embodiments, the one or more surfactants comprises at least one anionic surfactant. In some embodiments, the at least one anionic surfactant is selected from alkyl sulfate, alkyl ether sulfate, alpha olefin sulphonate, salts of fatty acids, monoalkyl phosphate, amino acid based surfactant, acyl isethionate and combinations thereof. In some embodiments, the at least one anionic surfactant is selected from sodium lauryl ether sulfate 1EO (SLES 1EO) and sodium lauryl sulfate (SLS). In some embodiments, the ratio of the fatty acid blend to the at least one anionic surfactant ranges from 0.025 to 0.4.

[0042] The formulation according to embodiments herein comprises at least one humectant. Humectants, which are capable of providing moisturization and conditioning properties to the mild cleansing composition, are suitable for use in the present invention. The humectant may be present in an amount of from about 0 percent to about 10 percent, preferably from about 0.5 percent to about 5 percent, and more preferably from about 0.5 percent to about 3 percent, based on the overall weight of the composition.In some embodiments, the humectants are selected from water soluble liquid polyols selected from the group comprising glycerine, propylene glycol, hexylene glycol, butylene glycol, dipropylene glycol, sorbitol, sucrose and mixtures thereof.

[0043] In various embodiments, the present disclosure further provides a rinse-off formulation that improves skin hydration without compromising essential features of said formulation such as lather quality and wash-off performance. This technical solution involves the synergistic combination of a free fatty acid blend — specifically with an iodine value between 110 to 135 / 100g — along with glycerine preferably in amounts greater than 1% wt. / wt. The high unsaturation in the free fatty acid blend may facilitate lipid deposition on theskin, forming a protective barrier, while glycerine may attract and retain moisture within the skin. This unexpectedly and surprisingly enhances both hydration and properties like surface smoothness and lather richness. The optimized balance of the fatty acid blend and surfactants in the formulation ensures superior hydration benefits without negatively affecting the lather profile or ease of rinsing, thus addressing the shortcomings of conventional cleansers and delivering a more effective, skin-friendly product.

[0044] The formulation according to embodiments herein comprises an amphoteric surfactant.

[0045] The term “amphoteric surfactant” as used herein refers to surfactants comprising molecules whose ionization state may change depending on the solution pH, resulting in a dual charge at the hydrophilic end that cancel out creating a net charge of zero, referred to as zwitterionic.

[0046] In some embodiments, the amphoteric surfactant is selected from betaine surfactants, sultaine surfactants, or combinations thereof, preferably selected from betaine surfactants. In some embodiments, the amphoteric surfactant is cocamidopropyl betaine.

[0047] In some embodiments, the liquid cleansing formulation further comprises at least one non-ionic surfactant in an amount ranging from 0.5 to 6% w / w.

[0048] In some embodiments, the at least one non-ionic surfactant is selected from glucose amides, lauryl glucoside, alkyl polyglucosides, sucrose cocoate, sucrose laurate, alkanolamides, ethoxylated alcohols, glyceryl monohydroxystearate, pareth-7, pareth-9, pareth-12, PEG-40-hydrogenated castor oil, Polysorbate 20, Polysorbate 80, Laureth-12, Deceth-12, Cetearth-20, Ceteareth-12, Laureth-23, Pareth-20, Polyglyceryl-4 caprate, PEG- 40 stearate, Caprylyl / capryl glucoside isosteareth-2, trideceth-3, hydroxystearic acid, propylene glycol stearate, PEG-2 stearate, sorbitan monostearate, glyceryl laurate, laureth-2, cocamide monoethanolamine, lauramide monoethanolamine, decyl glucoside, condensation products of long chain alcohols with sugar or starch polymers (for example, decyl polyglucoside and lauryl polyglucoside), amides (for example, cocoamide diethanolamine and cocoamide monoethanolamine), alkylene oxide derived surfactants (for example, ceteth- 6, ceteareth-6, steareth-6, PEG- 12 stearate, and PEG200 glyceryl tallowate), maltooligosyl glucoside / hydrogenated starch hydrolysate, and the combinations thereof.

[0049] In some embodiments, the liquid cleansing formulation further comprises at least one electrolyte in an amount ranging from 0.01 to 3% w / w.

[0050] The formulation according to embodiments herein comprises at least one electrolyte.

[0051] In some embodiments, the at least one electrolyte is selected from sodium chloride, potassium chloride, calcium chloride, magnesium chloride, zinc chloride, ferric chloride, aluminium chloride, sodium citrate, calcium citrate, sodium sulfate, magnesium sulfate, and the combinations thereof.

[0052] The formulation according to embodiments herein comprises a solvent. In some embodiments, the formulation comprises a solvent, preferably water, present in quantity sufficient in the formulation.

[0053] In some embodiments, one or more additives may be added to the cleansing formulation depending on the application and use of the formulation. Additives, according to embodiments herein include substances suitable for use in cleansing formulations. The additives are chosen in a way that they do not pose risk to human skin and are usually added in the lowest level, such that the advantageous properties of the formulation are not affected by the intended addition of the additives. In some embodiments, the additives may be added to the cleansing formulation for obtaining end user products such as, facewash, handwash, bodywash and the like. In some embodiments, the additive is selected from a neutralizer, a chelating agent, a fragrance component, an active agent, a preservative, a colorant, or combinations thereof.

[0054] The term “neutralizer” as used herein refers to substances used to restore the balance of hydrogen or hydroxyl ions in a solution, equalizing their ionic strength. In some embodiments, the neutralizer is selected from sodium hydroxide, potassium hydroxide, triethanolamine, or combinations thereof; and the neutralizer is present in quantity sufficient to achieve the desired pH (of about 7) in the formulation.

[0055] The term “chelating agent” as used herein refers to substances that bind with metal ions or metallic compounds that might engage in chemical reactions causing contamination and interfering with the functionality of the formulation. In some embodiments, the chelating agent is selected from ethylenediaminetetraacetic acid (EDTA), tetra sodium glutamate diacetate, or combinations thereof. In some embodiments, the chelating agent is in a weight range of 0.05 to 0.1% (w / w) with respect to total weight of the formulation. In some embodiments, the chelating agent is in a weight range of 0.06 to 0.1% (w / w) with respect to total weight of the formulation. In some embodiments, the chelating agent is in a weight range of 0.06 to 0.09% (w / w) with respect to total weight of the formulation.

[0056] In some embodiments, the chelating agent is selected from ethylenediaminetetraacetic acid (EDTA), tetra sodium glutamate diacetate, or combinations thereof, and the chelatingagent is in a weight range of 0.05 to 0.1% (w / w) with respect to total weight of the formulation.

[0057] The term “fragrance component” as used herein refers to substances that masks any undesirable odour by imparting a pleasant aroma to the product. It may include essential oils obtained from plants, animals, microbes or any natural sources (natural fragrances), or aromatic chemicals prepared in laboratories by using a combination of organic compounds (synthetic fragrances). In some embodiments, the fragrance component is selected from natural fragrances, synthetic fragrances, or combinations thereof. In some embodiments, the fragrance component is in a weight range of 0. 1 to 2 % (w / w) with respect to total weight of the formulation. In some embodiments, the fragrance component is in a weight range of 0. 1 to 1 % (w / w) with respect to total weight of the formulation. In some embodiments, the fragrance component is in a weight range of 0.4 to 0.8% (w / w) with respect to total weight of the formulation.

[0058] The term “active agent” as used herein refers to substances, which help to improve the overall personal care / cosmetic benefits of the formulation, for example salicylic acid.

[0059] In some embodiments, the active agent is selected from antiacne agent, detan agent, pore minimizing agent, skin lightening / brightening agent, pollution control agent, moisturizing agent, emulsifiers, oil control agent, refreshing agent, photo-protectant agent or combinations thereof. In some embodiments, the active agent is in a weight range of 0.001 to 0.7% (w / w) with respect to total weight of the formulation. In some embodiments, the active agent is in a weight range of 0.005 to 0.6% (w / w) with respect to total weight of the formulation. In some embodiments, the active agent is in a weight range of 0.01 to 0.5% (w / w) with respect to total weight of the formulation.

[0060] In some embodiments, the active agent is selected from antiacne agent, detan agent, pore minimizing agent, skin lightening / brightening agent, pollution control agent, moisturizing agent, oil control agent, refreshing agent, photo-protectant agent or combinations thereof; and the active agent is in a weight range of 0.001 to 0.7% (w / w) with respect to total weight of the formulation.

[0061] The term “preservative” as used herein refers to natural or synthetic substances that are added to formulation to protect from any contamination and intended to increase the shelf life of the formulation. In some embodiments, the preservative is selected from phenoxyethanol, paraben, hydantoin, ethylhexyl glycerin, benzoate, isopropyl-m-cresol, methylisothiazolinone, methylchloroisothiazolinone, or combinations thereof; and the preservative is in a weight range of 0.5 to 0.9% (w / w) with respect to total weight of theformulation. In some embodiments, the preservative is in a weight range of 0.6 to 0.8% (w / w) with respect to total weight of the formulation.

[0062] The term “colorant” as used herein refers to a substance which is added to impart desirable colour to a formulation. In some embodiments, the colorant is selected from natural colorant, synthetic colorant, dyes, or combinations thereof. In some embodiments, the colorant is in a weight range of 0.0001 to 0.1% (w / w) with respect to total weight of the formulation. In some embodiments, the colorant is in a weight range of 0.0005 to 0.05% (w / w) with respect to total weight of the formulation. In some embodiments, the colorant is in a weight range of 0.001 to 0.01% (w / w) with respect to total weight of the formulation.

[0063] In some embodiments, the colorant is selected from natural colorant, synthetic colorant, dyes or combinations thereof; and the colorant is in a weight range of 0.0001 to 0.1% (w / w) with respect to total weight of the formulation.

[0064] The foregoing description of the specific embodiments will so fully reveal the general nature of the embodiments herein that others can, by applying current knowledge, readily modify and / or adapt for various applications such specific embodiments without departing from the generic concept, and, therefore, such adaptations and modifications should and are intended to be comprehended within the meaning and range of equivalents of the disclosed embodiments. It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation. Therefore, while the embodiments herein have been described in terms of preferred embodiments, those skilled in the art will recognize that the embodiments herein can be practiced with modification within the scope of the embodiments as described herein.

[0065] The present invention is further explained in the form of following examples. However, it is to be understood that the following examples are merely illustrative and are not to be taken as limitations upon the scope of the invention.EXAMPLES

[0066] The disclosure will now be illustrated with working examples, which are intended to illustrate the working of disclosure and not intended to take restrictively to imply any limitations on the scope of the present disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood to one of ordinary skill in the art to which this disclosure belongs. Although methods and materials similar or equivalent to those described herein can be used in the practice of the disclosed methods and formulations, the exemplary methods, devices, and materials are describedherein. It is to be understood that this disclosure is not limited to particular methods, and experimental conditions described, as such methods and conditions may vary.

[0067] A free fatty acid blend, composition whereof is disclosed in Table 1 below was used for realizing the exemplary formulations provided hereinbelow.Table 1: Free Fatty Acid Blend

[0068] RINSE-OFF SOAP BAR FORMULATION AND EFFECT OF FREEFATTY ACID BLENDTable 2: Rinse-off soap bar formulation and effect of free fatty acid blend*Values are measured on a scale of 1 to 10: 10 represents the best result whereas 1 represents the worst result.As can be seen in Table 2 above, Formulation 2 (present disclosure) comprising the free fatty acid blend of iodine value 125 / 100g exhibits improved hydration, surface finish, and lather quality when compared with Formulation 1 (comparative formulation) devoid of a free fatty acid bend. Accordingly, it could be concluded that the free fatty acid blend, particularly, having an iodine value falling within the range specified above (i.e. 110 to 135 / 100g and preferably, between 120 to 130 / 100g) exhibits functional reciprocity (synergism) with the surfactants affording rinse-off formulations having improved hydration, surface finish, and lather quality, precluding the necessity of utilization of ingredients that are detrimental to some properties of the formulations.

[0069] RINSE-OFF FACE AND BODY LIQUID FORMULATION AND EFFECT OF FREE FATTY ACID BLEND Table 3: A rinse-off face and body liquid formulation and effect of free fatty acid blendAs can be seen in Table 3 above, Formulation 3 (present disclosure) comprising the free fatty acid blend of iodine value of about 125 / 100g exhibits an improved hydration effect when compared with Formulation 4 (comparative formulation) devoid of the free fatty acid blend. Accordingly, it could be concluded that the free fatty acid blend, particularly, having an iodine value, falling within the range specified above (i.e. 110 to 135 / 100g and preferably, between 120 to 130 / 100g), exhibits functional reciprocity (synergism) with the surfactants affording rinse-off formulations having improved hydration, precluding the necessity of utilization of ingredients that are detrimental to some properties of the formulations.

[0070] EFFECT OF FREE FATTY ACID BLENDS HAVING DIFFERENTIODINE VALUES ON THE RINSE-OFF FORMULATIONTable 4: Effect of free fatty acid blends having different iodine values on hydration effect of the rinse-off formulations*Values are measured on a scale of 1 to 10: 10 represents the best result whereas 1 represents the worst resultComposition for the free fatty acid blend having iodine value of 15 / 100 gm used for realizing the formulation 5 is provided below:

[0071] A RINSE-OFF HANDWASH FORMULATIONTable 5: A rinse-off handwash formulation

[0072] A RINSE-OFF BODY CLEANSING FORMULATIONTable 6: A rinse-off body cleansing formulation

[0073] A RINSE-OFF HAIR CLEANSING FORMULATIONTable 7: A rinse-off Hair cleansing formulation

[0074] SYNERGISM BETWEEN FREE FATTY ACID BLEND AND GLYCERINEIt was also surprising to note that incorporation of free fatty acid blend having iodine value between 110 to 135 / 100g and preferably, between 120 to 130 / 100g, and glycerine in an amount of more than 3% wt. / wt. in the cleansing formulation affords dramatic improvement in the hydration, owing to functional reciprocity (synergism) there between.Table 8: Effect of free fatty acid blends having iodine values between 110 to 135 / 100g*- On a scale of 1 to 10 - 10 is best, 1 is worst as tested on a panel n=10

[0075] As evident from Table 8 above, the combination of the free fatty acid blend, in particular, the free fatty acid blend with an iodine value between 110 to 135 / 100g along with glycerine, preferably in an amount greater than 1% wt. / wt. produces a synergistic effect that potentially enhances skin hydration in present formulations. The observed surprising technical effect is evidenced by the increased percentage of hydration without adversely affecting lather quality. It may further be noted that lather quality and hydration are often inversely related due to components producing lather but can strip natural oils from the skin, leading to dryness and moisturising agents like glycerine can sometimes suppress foam formation by altering the surfactant structure. However, the free fatty acid blend along with glycerine does not suppress lather and likely enhance the surfactant structure by stabilizing foam as well as provides lipid replenishment for better hydration.

[0076] While the foregoing describes various embodiments of the disclosure, other and further embodiments of the disclosure may be devised without departing from the basic scope thereof. The scope of the invention is determined by the claims that follow. The invention is not limited to the described embodiments, versions or examples, which are included to enable a person having ordinary skill in the art to make and use the invention when combined with information and knowledge available to the person having ordinary skill in the art.

Claims

We Claim :

1. A rinse-off formulation comprising a free fatty acid blend in an amount of 1 to 3.0% w / w; and one or more surfactants in an amount ranging from 20 to 45% w / w.

2. The rinse-off formulation as claimed in claim 1, wherein formulation comprises glycerine, and wherein glycerine is in an amount ranging from 1 to 12% w / w.

3. The rinse-off formulation as claimed in claim 1, wherein the free fatty acid blend exhibits an iodine value ranging from 110 to 135 / 100g.

4. The rinse-off formulation as claimed in claim 1, wherein the free fatty acid blend exhibits an iodine value ranging from 120 to 130 / 100g.

5. The rinse-off formulation as claimed in claim 1, wherein the free fatty acid blend comprises fatty acids selected from stearic acid, myristic acid, palmitic acid, linoleic acid, linolenic acid, oleic acid, and combinations thereof.

6. The rinse-off formulation as claimed in claim 1, wherein the free fatty acid blend comprises at least two unsaturated fatty acids having alkyl chain lengths between C14 and C22 in an amount of more than 60% w / w, and preferably between 75-90% w / w.

7. The rinse-off formulation as claimed in claim 5, wherein the free fatty acid blend comprises: palmitic acid in an amount ranging from 5-15% w / w, stearic acid in an amount ranging from 3-10% w / w, oleic acid in an amount ranging from 20-40% w / w, linoleic acid in an amount ranging from 30-60% w / w, and a-linolenic acid in an amount ranging from 1-10% w / w.

8. The rinse-off formulation as claimed in any one of claims 1 to 7, wherein the one or more surfactants comprises at least one anionic surfactant.

9. The rinse-off formulation of claim 8, wherein the at least one anionic surfactant is selected from alkyl sulfate, alkyl ether sulfate, alpha olefin sulphonate, salts of fatty acids, monoalkyl phosphate, amino acid-based surfactant, acyl isethionate, and combinations thereof.

10. The rinse-off formulation of claim 8, wherein the at least one anionic surfactant is selected from sodium lauryl ether sulfate 1EO (SLES 1EO) and sodium lauryl sulfate (SLS).

11. The rinse-off formulation of any one of claims 1 to 10, wherein the ratio of the fatty acid blend to the at least one anionic surfactant ranges from 0.004 to 0.15, more particularly between 0.022 and 0.1.

2. The rinse-off formulation as claimed in any one of the preceding claims, wherein the formulation provides enhanced hydration to the skin without compromising lather profile and wash-off characteristics.

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