FIELD

The present disclosure relates to a cleaning composition.

DEFINITION As used in the present disclosure, the following term is generally intended to have the meaning as set forth below, except to the extent that the context in which they are used indicate otherwise.

Amphoteric surfactant refers to a surfactant simultaneously carrying the anionic and cationic hydrophilic group with its structure containing simultaneously hermaphroditic ions which are able to form cation or anion according to the (such as pH changes) ambient conditions.

Anionic Surfactant refers to the surfactants having at least one sulfate group (-OS03H or - OSCV), and/or a sulfonate group (-S03H or -S03), or else carboxylic or carboxylate surfactants having at least one carboxylic acid group (-COOH or -COO"). Amino acid-based surfactant refers to the surfactants wherein amino acids such as L- glutamic acid and other natural fatty acids, offer pH compatibility to human skin and good cleansing power, while being relatively safe and providing improved tactile and moisturization properties compared to other anionic surfactants.

BACKGROUND

The background information herein below relates to the present disclosure but is not necessarily prior art.

In most recent advancement in surfactant industry amino acid based surfactants provide ample mildness, good lathering properties with a good cleaning ability. Often these types of surfactants are the first choice of formulators. Although, these amino acid based surfactants are anionic in nature, they usually do not show thickening property in the presence of salt or in the presence of amphoteric surfactants. The simplest way to make such compositions is to add a thickener or polymers on top of a non-viscous product. However, for these types of anionic surfactants, the choice of thickeners are very less and are undesirable in many respects, such as processing issues, long term product stability issues as well as other considerations related to cost. For thickening, the most commonly, used ingredients are ethanolamide, biopolymers, or associative thickeners which make the formulation costly and change the sensory profile. It is thus desirable to formulate a cleaning composition with amino acid based surfactant which is viscous, but does not necessarily contain a thickener and is cost effective.

It’s a well-known art which comprises an anionic surfactant together with an amphoteric surfactant in the presence or absence of an electrolyte. However, this fails to thicken amino acid based anionic surfactant.

Therefore, a need is felt to provide a cleaning composition that mitigates the drawbacks mentioned hereinabove mentioned.

OBJECTS Some of the objects of the present disclosure, which at least one embodiment herein satisfies, are as follows:

An object of the present disclosure is to provide a cleaning composition.

Another object of the present disclosure is to provide a process for the preparation of a cleaning composition. Still another object of the present disclosure is to provide a cleaning composition without compromising the efficacy and safety, has self thickening property, high foaming tendency, has good organoleptic properties, and yet is cost effective.

Yet another object of the present disclosure is to provide a self-thickening cleaning composition that allows higher loading of amino acid based surfactant. Other objects and advantages of the present disclosure will be more apparent from the following description, which is not intended to limit the scope of the present disclosure. SUMMARY

The present disclosure provides a cleaning composition. The composition comprises a homogeneous mixture of at least one amino acid based surfactant, at least one anionic surfactant, at least one amphoteric surfactant, optionally at least one pH modifier and water. The cleaning composition has a viscosity in the range of 1000-25000 cps at a pH in the range of 5 - 8. In an embodiment, the cleaning composition comprises a homogeneous mixture of at least one amino acid based surfactant in an amount in the range of 2 wt% - 25 wt%, an anionic surfactant in an amount in the range of 1 wt% - 10 wt%, an amphoteric surfactant in an amount in the range of 1 wt% - 10 wt%, optionally at least one pH modifier, and water in an amount in the range of 55 wt% - 96 wt%.. Typically, the cleaning composition has a viscosity in the range of 5000-11000 cps at a pH in the range of 5 - 8.

The present disclosure further provides a process for preparing a cleaning composition. The process comprises intimately mixing an amino acid based surfactant in amount ranging from 2 wt% to 25 wt%, an anionic surfactant in an amount ranging from 1 wt% to 10 wt%, an amphoteric surfactant in an amount ranging from 1 wt% to 10 wt%, water and optionally adding at least one pH modifier until the pH of the composition is in the rage of 5-8.

DETAILED DESCRIPTION

Embodiments are provided so as to thoroughly and fully convey the scope of the present disclosure to the person skilled in the art. Numerous details are set forth, relating to specific components, and methods, to provide a complete understanding of embodiments of the present disclosure. It will be apparent to the person skilled in the art that the details provided in the embodiments should not be construed to limit the scope of the present disclosure. In some embodiments, well-known processes, well-known apparatus structures, and well-known techniques are not described in detail.

The terminology used, in the present disclosure, is only for the purpose of explaining a particular embodiment and such terminology shall not be considered to limit the scope of the present disclosure. As used in the present disclosure, the forms "a,” "an," and "the" may be intended to include the plural forms as well, unless the context clearly suggests otherwise. The terms "comprises," "comprising,"“including,” and“having,” are open ended transitional phrases and therefore specify the presence of stated features, integers, steps, operations, elements, modules, units and/or components, but do not forbid the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. The particular order of steps disclosed in the method and process of the present disclosure is not to be construed as necessarily requiring their performance as described or illustrated. It is also to be understood that additional or alternative steps may be employed.

Cleaning compositions with self-thickening properties are well known in the art, and have found various applications, for instance, in the context of personal care, hard surface, or laundry cleaning compositions. Typically, the cleaning composition is used as keratin care composition such as shampoo, body wash, hand wash, face wash, and the like.

Conventional cleaning composition contains harsh chemicals such as a combination ethylene oxide and SLS which binds to the keratin which leads to stripping of lipids from the keratinous material. Due to this, the individual faces the problem of dry and rough skin. Moreover, the conventional cleaning composition does not wash off completely and there is a feeling of residue left on the skin. The simplest way to make such compositions is to have a combination of anionic surfactant together with an amphoteric surfactant in the presence or absence of an electrolyte. However, its thickening capability doesn’t work in the presence of amino acid based surfactant and that too in a pH range, which is skin friendly, as well as other considerations like a dose dependent thickening of amino acid surfactant. It is thus desirable to formulate a cleaning composition which is viscous, but does not necessarily contain a thickener or salt.

The drawback of the prior art is attenuated and a skin friendly product is obtained according to the present disclosure by using a mild cleaning composition for keratin wash without compromising on cleaning efficacy with a combination of ammonium alkyl sulphate with amphoteric surfactant to thicken the cleaning composition.

Surprisingly, it has been found that the combination of a specific anionic and an amphoteric surfactant at certain ratio and at specific pH can thicken even hard to thicken amino acid surfactants.

The present disclosure provides the cleaning composition that overcomes the drawback mentioned herein above and provides the composition which has clean feel, quick wash off and prevents the stripping of the lipids from the keratinous material.

The present disclosure further provides a process for preparation of the cleaning composition. In an aspect, the composition comprises a homogeneous mixture of at least one amino acid based surfactant, at least one anionic surfactant, at least one amphoteric surfactant, optionally at least one pH modifier and water. The cleaning composition has a viscosity in the range of 1000-25000 cps at a pH in the range of 5.0-8.0 In an embodiment, the composition comprises a homogeneous mixture of an amino acid based surfactant in an amount in the range of 2 wt% - 25 wt%, an anionic surfactant in an amount in the range of 1 wt% - 10 wt%, an amphoteric surfactant in an amount in the range of 1 wt% - 10 wt%, optionally at least one pH modifier and qs water.

Typically, the cleaning composition has a viscosity in the range of 5000-11000 cps at a pH in the range of 5.0-8.0.

In another embodiment, the composition comprises a homogeneous mixture of an amino acid based surfactant in an amount in the range of 2 wt% - 18 wt%, an anionic surfactant in an amount in the range of 1 wt% - 7 wt%, an amphoteric surfactant in an amount in the range of 1 wt% - 6 wt%, optionally at least one pH modifier and qs water. In the present disclosure, the amino acid-based surfactant systems refers to those surfactants derived from amino acids L-glutamic acid and other natural fatty acids, offer pH compatibility to human skin and good cleansing power, while being relatively safe and providing improved tactile and moisturization properties compared to other anionic surfactants. Some of the common examples of it are mentioned below.

In accordance with the present disclosure, the amino acid based surfactant is selected from group comprising of sodium cocoyl glycinate (SCG), sodium cocoyl glutamate (SCGL) or Sodium Lauroyl Sarcosinate (NaLS) and a combination thereof. In one embodiment, the amino acid based surfactant is sodium cocoyl glycinate (SCG). In another embodiment, the amino acid based surfactant is sodium cocoyl glutamate (SCGL). In yet another embodiment the amino acid based surfactant is Sodium Lauroyl Sarcosinate (NaLS).

In accordance with the present disclosure, the anionic surfactant is ammonium lauryl sulphate (ALS).

The amphoteric surfactants that are used in the present disclosure is optionally quaternized secondary or tertiary aliphatic amine derivatives, in which the aliphatic group is a linear or branched chain comprising from 8 to 22 carbon atoms. The amine derivatives containing at least one anionic group, for instance a carboxylate, sulfonate, sulfate, phosphate, or phosphonate group. Particularly, the amphoteric surfactant is alkyl betaines, sulfobetaines, (C8-C20) alkylsulfobetaines, (C8-C20) alkylamido, alkyl betaines, such as

cocamidopropyibetaine and (C8-C20) alkylamido, alkylsulfobetaines, and mixtures thereof.

In accordance with the present disclosure, the amphoteric surfactant is cocoamido propyl betaine (CAPB).

In accordance with the present disclosure, the pH adjusting agents are the class of organic acids. The organic acid is selected from alpha hydroxy and beta hydroxy acids. Typically, the organic acid is selected from citric acid and tartaric acid. In an embodiment of the present disclosure, 30% citric acid solution is used to adjust the pH to a physiological acceptable range of 5-8.

In another aspect, the present disclosure provides a process for preparation of the cleaning composition. The process comprises, intimately mixing an amino acid based surfactant in amount ranging from 2 wt% to 25 wt%, an anionic surfactant in an amount ranging from 1 wt% to 10 wt%, an amphoteric surfactant in an amount ranging from 1 wt% to 10 wt%, and water and optionally adding a pH modifier until the pH of the composition is in the range of 5-8.

In an embodiment, the process comprises intimately mixing an amino acid based surfactant in an amount in the range of 2 wt% - 18 wt%, an anionic surfactant in an amount in the range of 1 wt% - 7 wt%, an amphoteric surfactant in an amount in the range of 1 wt% - 6 wt%, water and optionally adding a pH modifier until the pH of the composition is in the range of 5-8. In one embodiment of the present disclosure, ammonium alkyl sulfate is blended with amphoteric surfactant to thicken an amino acid based surfactant system.

Typically, the ammonium alkyl sulphate can be used to thicken the amino acid based surfactant as much as 25% on 100% active detergent on weight basis. The combination typically gives an optimum viscosity in the range of 5000-11000 cps at pH in the range of from 5-8 which is suitable for most personal care products.

The above combination of the present disclosure, wherein ammonium alkyl sulfate is blended with amphoteric surfactant, is also responsive to salt thickening. The combination of ammonium alkyl sulfate and amphoteric surfactant works on micellar structure. In accordance with the present disclosure, the cleansing composition is applied on the keratin material, eventually with water, followed by rinsing with water to eliminate foam, grime, and dirt. The composition is applied directly on wet keratin materials, or alternatively mixed with water and then applied on keratin materials.

For the purposes of the present invention, the expression "physiologically acceptable medium" means a medium that is suitable for application of a composition according to the invention on keratinous material, such as skin, hair etc.

A physiologically acceptable medium is preferably a cosmetically or deontologically acceptable medium, that is to say a medium which is devoid of unpleasant odor or appearance and which is entirely compatible with the topical administration route. Such a medium is in particular considered as physiologically acceptable when it does not cause the user any unacceptable stinging, tautness or redness.

The cleaning composition of the present disclosure provide without compromising the efficacy and safety, has self thickening property, high foaming tendency, has good organoleptic properties and is cost effective. Moreover, the cleaning composition of the present disclosure allows higher loading of amino acid based surfactant.

The foregoing description of the embodiments has been provided for purposes of illustration and not intended to limit the scope of the present disclosure. Individual components of a particular embodiment are generally not limited to that particular embodiment, but are interchangeable. Such variations are not to be regarded as a departure from the present disclosure, and all such modifications are considered to be within the scope of the present disclosure.

The present disclosure is further described in light of the following experiments which are set forth for illustration purpose only and not to be construed for limiting the scope of the disclosure. The following experiments can be scaled up to industrial/commercial scale and the results obtained can be extrapolated to industrial scale.

EXPERIMENTAL DETAILS

Experiment 1: General Process for preparation of cleaning composition (samples A-G)

An amphoteric surfactant (Cocoamido Propyl Betaine), an anionic surfactant (Ammonium Lauryl Sulphate), an amino acid based surfactant (Sodium cocoyl glycinate), and water was mixed and blended to obtain the cleaning composition.

The concentration/strength of solution of surfactants is given as trade name in the table. The solution of the surfactants was taken as wt/wt of the ingredient solution wherein the actual wt/wt of ingredient was calculated by the following formula: Wherein wt

— of ingredient

wt

= Strength/concentratlon of the ingredient solution

X %wt/wt of the ingredient solution use d

Samples of cleaning composition were prepared by blending the compounds in accordance with the table 1-7.

Table 1 - Sample A

Table 2 - Sample B

Table 3 - Sample C

Table 4 - Sample D

Table 5 - Sample E

Table 6 - Sample F

Table 7 - Sample G

Experiment 2: Analysis of the viscosity of the cleaning compositions of the present disclosure.

Viscosity measurement The viscosity measurements were performed at 25 °C and atmospheric pressure using a Brookfeild RV - DV-II+Pro apparatus.

The samples were brought at the temperature of 25 °C ± 2 °C. The viscosity is measured using Spindle RV 02 for very low viscosity samples and RV 05 for the rest of the experiments attachment to Brookfeild RV - DV-II+Pro at a rotation speed of 60 /20 RPM (for very low and viscosity and others respectively) after rotation of the measuring instrument for 30 Seconds.

Table 8 - Effect of ALS concentration on Viscosity at various pH of some of the samples were as follow:

From the above experiments, it is concluded that at pH 6.0 -6.5 optimum viscosity was obtained with ALS and CAPB at a ratio of 1.63: 1 (18% and 11%). When the pH is higher than 8 as shown for sample C, viscosity comes down to 280 cps.

In samples E, F, and G the dose dependent effect of Cocoamido Propyl betaine can be seen in table 9:

Table 9:

COMPARATIVE EXAMPLES:

Experiment 3: Effects of varying amounts of surfactants on viscosity of the cleaning composition.

Table 10 - Samples of Cocoamidopropyl betaine (CAPB) and Sodium Cocoyl glycinate (SCG) association

Conclusion: CAPB alone is not effective to build up the viscosity for Amino acid based surfactant

Table 11 - Samples of Ammonium Lauryl Sulphate (ALS) and Sodium Cocoyl glycinate (SCG) association

Conclusion: ALS alone is not effective to build up viscosity of amino acid based surfactant

Table 12 - Samples of Sodium Lauryl Sulphate (SLS), Cocoamido propyl betaine (CAPB) and Sodium Cocoyl Glycinate (SCG) association

SLS is commercially available as Galaxy 780 by Galaxy Surfactants as 28% active content liquid.

Conclusion: SLS and CAPB are not able to increase the viscosity of Amino acid based surfactant (SCG). Table 13 - Samples of Ammonium Lauryl Sulphate (ALS), Cocoamido propyl betaine and Sodium Cocoyl Glutamate (SCGL) association

Sodium Cocoyl glutamate is commercially available as Galsoft SCGL by Galaxy Surfactant as 30% Active content liquid. Conclusion: The combination of Ammonium Lauryl sulphate and Cocoamido propyl betaine can effectively build up the viscosities of other amino acid-based surfactant for which non limiting examples provided above

Table 14 - Samples of Ammonium Lauryl Sulphate (ALS), Cocoamido propyl betaine and Sodium Cocoyl Glycinate (SCG) association at 18% Active detergent

Conclusion: The combination of Ammonium Lauryl sulphate and Cocoamido propyl betaine can effectively build up the viscosities of amino acid-based surfactant at high loading of amino acid based surfactant as well. Table 15 - Samples of Ammonium Lauryl Sulphate (ALS), Cocoamido propyl betaine (CAPB) and Sodium Lauroyl Sarcosinate (NaLS)

Sodium Lauroyl Sarcosinate is available as Galsoft NaLS 30% solution by Galaxy

Surfactants. Conclusion: The combination of Ammonium Lauryl sulphate and Cocoamido propyl betaine can effectively build up the viscosities of other amino acid-based surfactant.

Table 16 - Samples of Ammonium Lauryl Sulphate (ALS) at different concentration, Cocoamido propyl betaine (CAPB) and Sodium Cocoyl Glycinate (SCG) association

It is understood from Tables 1-16 that the cleaning composition of the present disclosure is capable of giving an optimum viscosity of 1000-25000 cps at a pH ranging from 4.0-8.0. Also, the cleaning composition comprising the amino acid based surfactant having a concentration outside the range of 2 wt% - 25 wt%, the anionic surfactant having a concentration outside the range of 1 wt% - 10 wt%; and the amphoteric surfactant having a concentration outside the range of 1 wt% - 10 wt%, at a pH outside the range of 5.0 - 8.0, will not give the desired results of optimum viscosity of 1000-25000 cps.

The cleaning composition has a self-thickening property, a high foaming tendency, a good cleaning properties with high mildness, and is cost effective.

Evaluation of overall performance of the cleansing composition of the present disclosure on Human Skin.

(A) Criteria for choosing volunteer:

The volunteers with a minimum age of 21 or more and an upper age limit of 75 years were selected for the evaluation of the cleaning composition on skin. The volunteers with any skin diseases or cut on body were excluded from the study. 14 volunteers (7 male and 7 female) were selected for the study.

(B) Data collection:

Internal panel test with 14 respondents were carried out in a double blind study, where the cleaning composition was placed against a market benchmark composition were carried out using numeric codes from 1-10.

(C) Application of the cleaning composition on the volunteers:

Respondents were asked to use the cleaning composition of the present disclosure and the benchmark composition as a face wash for comparison. Thereafter rank the product on the following parameters; · Appearance

• Spreadability

• Ease of lathering

• Rinsability

• Skin feel just after rinsing · Skin feel post Drying

The formulation trial of the cleaning composition was labeled as“Sample A” and“Sample

B”, wherein the “Sample A” is market benchmark and “Sample B” is the cleaning composition of the present disclosure. The male volunteers were numbered as Ml, M2, M3, M4, M5, M6, M7, and M8. The female volunteers were numbered as Fl, F2, F3, F4, F5, F6, F7, and F8.

Table 17: Application of Sample A on the volunteers

Table 18: Application of Sample B on the volunteers

Conclusion: 9 out of 14 respondents liked the new invented formulation over the benchmark.

Further, respondents were asked to use the cleaning composition of the present disclosure as a face wash and a benchmark composition as soap for comparison. Thereafter rank the product on the following parameters;

• Ease of lathering

• Rinsability

Skin feel just after rinsing Skin feel post Drying

Conclusion: 11 out of 14 respondents liked the new invented formulation over the benchmark soap. The soap leads to stripping of the lipids from the skin, whereas the cleaning composition of the present disclosure prevent the stripping of the lipids from the skin. The cleaning composition of the present disclosure provide without compromising the efficacy and safety, has self thickening property, high foaming tendency, has organoleptic properties and is cost effective. Moreover, the cleaning composition of the present disclosure allows higher loading of amino acid based surfactant.

TECHNICAL ADVANCEMENTS The present disclosure described herein above has several technical advantages including, but not limited to, the realization of the cleaning composition which:

• has self-thickening property;

• has high foaming tendency;

• allows for higher loading of amino acid based surfactants; · has good cleaning with high mildness and organileptic properties; and

• is cost effective.

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

The use of the expression“at least” or“at least one” suggests the use of one or more elements or ingredients or quantities, as the use may be in the embodiment of the disclosure to achieve one or more of the desired objects or results.

Any discussion of documents, acts, materials, devices, articles or the like that has been included in this specification is solely for the purpose of providing a context for the disclosure. It is not to be taken as an admission that any or all of these matters form a part of the prior art base or were common general knowledge in the field relevant to the disclosure, as it existed anywhere before the priority date of this application.

The numerical values mentioned for the various physical parameters, dimensions or quantities are only approximations and it is envisaged that the values higher/lower than the numerical values assigned to the parameters, dimensions or quantities fall within the scope of the disclosure, unless there is a statement in the specification specific to the contrary. While considerable emphasis has been placed herein on the components and component parts of the preferred embodiments, it will be appreciated that many embodiments can be made and that many changes can be made in the preferred embodiments without departing from the principles of the disclosure. These and other changes in the preferred embodiment as well as other embodiments of the disclosure will be apparent to those skilled in the art from the disclosure herein, whereby it is to be distinctly understood that the foregoing descriptive matter is to be interpreted merely as illustrative of the disclosure and not as a limitation.