TECHNICAL FIELD
[001] The subject matter described herein in general relates to the field of
personal care products, and in particular, relates to the field of soap compositions.
BACKGROUND OF INVENTION
[002] In today’s world, we are surrounded by microorganisms. A number of them are capable of causing serious ailments and diseases. The exposure to such pathogens in today’s world is unavoidable, since air, water and soil-based pathogens are well-known. In such a scenario, it can be imagined that the immune system has to be working overtime in order to keep the invading pathogens at bay. As a mechanism of defense, mankind has developed personal care products to assist natural defenses of the human body.
[003] Solid or liquid formulations typically comprising alkali salts of long chain fatty acids are known are soaps. The ability of soaps to remove dirt or grease owing to their amphiphilic nature is well established. Additionally, in terms of personal hygiene, soaps act as the first line of defense. The alkali salts are known to disrupt the cell membrane of microorganisms, thus performing a disinfectant-like function. It is hence not surprising that Indian soap industry was valued to be around USD 1.03 million at the end of year 2000.
[004] A number of soap compositions can be found in the market. A particularly preferred trait among consumers is the opaque soap bars that have soft-feel and good lather. These soap bars allow easy incorporation of colorants and hence can be found to be visually appealing. Since, the overall sensorial appeal of a soap bar composition is also reliant on its ‘touch’ or ‘feel’, providing a soap bar with high moisture content is a desirable characteristic. However, high moisture content in soap bars can lead to undesirable affects such as sweating, which can also be countered by the usage of inorganic fillers. The inclusion of inorganic fillers, such as talc and clay, allow long term retention of moisture content in soap bars. The incorporation of inorganic fillers also provides the preferred opacity, while reducing cost of the soap bar. However, the incorporation of such inorganic fillers beyond a certain percentage is seen to be detrimental in soap bar processing. Since these components have high density, the principle drawback pertains to the

undesirably high density of the resulting soap bar. High density soap bars are known to suffer from easy cracking. Hence, there is need for a cost-effective soap bar that is able to incorporate high level of inorganic fillers, while maintaining the soap bar density within an acceptable range.
SUMMARY OF THE INVENTION
[005] In an aspect of the present invention, there is provided an opaque soap bar comprising: organic content comprising i) at least one sodium salt of fatty acid; ii) at least one humectant; and iii) at least one surfactant; at least one inorganic filler; and water, wherein the at least one inorganic filler to the organic content weight ratio is in the range of 1:5 to 1:8.
[006] In another aspect of the present invention, there is provided a process for preparing an opaque soap bar comprising: organic content comprising i) at least one sodium salt of fatty acid; ii) at least one humectant; and iii) at least one surfactant; at least one inorganic filler; and water, wherein the at least one inorganic filler to the organic content weight ratio is in the range of 1:5 to 1:8, said process comprising: a) obtaining at least one sodium salt of fatty acid; b) obtaining at least one humectant; c) obtaining at least one surfactant; d) obtaining at least one inorganic filler; e) contacting at least one sodium salt of fatty acid, at least one humectant, at least one surfactant and at least one inorganic filler with water to obtain a soap mass; and f) processing the soap mass to obtain the opaque soap bar. [007] These and other features, aspects, and advantages of the present subject matter will be better understood with reference to the following description and appended claims. 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 claimed subject matter, nor is it intended to be used to limit the scope of the claimed subject matter.
DETAILED DESCRIPTION OF THE INVENTION
[008] Those skilled in the art will be aware that the present disclosure is subject to
variations and modifications other than those specifically described. It is to be

understood that the present disclosure includes all such variations and
modifications. The disclosure also includes all such steps, features, compositions,
and compounds referred to or indicated in this specification, individually or
collectively, and any and all combinations of any or more of such steps or features.
Definitions
[009] For convenience, before further description of the present disclosure,
certain terms employed in the specification, and examples are delineated here.
These definitions should be read in the light of the remainder of the disclosure and
understood as by a person of skill in the art. The terms used herein have the
meanings recognized and known to those of skill in the art, however, for
convenience and completeness, particular terms and their meanings are set forth
below.
[0010] The articles “a”, “an” and “the” are used to refer to one or to more than one
(i.e., to at least one) of the grammatical object of the article.
[0011] The terms “comprise” and “comprising” are used in the inclusive, open
sense, meaning that additional elements may be included. It is not intended to be
construed as “consists of only”.
[0012] Throughout this specification, unless the context requires otherwise the
word “comprise”, and variations such as “comprises” and “comprising”, will be
understood to imply the inclusion of a stated element or step or group of element or
steps but not the exclusion of any other element or step or group of element or
steps.
[0013] The term “including” is used to mean “including but not limited to”.
“Including” and “including but not limited to” are used interchangeably.
[0014] Inorganic fillers refer to low-cost components of soap formulation that play
a role in providing structural rigidity to the soap bar and may alternatively be
known as ‘fillers’ or ‘structurants’. The term ‘Inorganic filler’ in the present
disclosure is used to denote commonly known inorganic fillers such as talc, sodium
carbonate, bentonite clay, kaolin clay, sodium chloride, and combinations thereof.
The inorganic fillers form the fat-insoluble component of the soap bar and provide
opacity to said soap bar.

[0015] Soap content refers to the weight percentage of alkali salt of fatty acids in the total composition. In the present disclosure, fatty acids with carbon chain length ranging from C8 to C20 have been considered in the process of soap preparation. In an embodiment of the present disclosure the fatty acid is selected from the group consisting of oleic acid, lauric acid, stearic acid, mystric acid, palmitic acid, and combinations thereof.
[0016] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. Although any 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. All publications mentioned herein are incorporated herein by reference.
[0017] 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, compositions, and methods are clearly within the scope of the disclosure, as described herein.
[0018] As mentioned previously, there is need for a cost-effective soap bar with high sensorial appeal. The present document discloses a unique composition comprising high percentage of inorganic fillers, while allowing the soap bar to retain an acceptable density. The soap bar so formed is crack free, displays less mush and retains moisture for a longer duration.
[0019] In an embodiment of the present disclosure, there is provided an opaque soap bar comprising: organic content comprising i) at least one sodium salt of fatty acid; ii) at least one humectant; and iii) at least one surfactant; at least one inorganic filler; and water, wherein the at least one inorganic filler to the organic content weight ratio is in the range of 1:5 to 1:8.
[0020] In an embodiment of the present disclosure, there is provided an opaque soap bar comprising: organic content comprising i) at least one sodium salt of fatty acid; ii) at least one humectant; and iii) at least one surfactant; at least one inorganic filler; and water, wherein the at least one inorganic filler to the organic content weight ratio is in the range of 1:5.5 to 1:7.5.

[0021] In an embodiment of the present disclosure, there is provided an opaque
soap bar as described herein, wherein the at least one sodium salt of fatty acid has a
weight percentage in the range of 54 - 75 % with respect to the opaque soap bar
and is selected from the group consisting of sodium salts of palmitic acid, lauric
acid, myristic acid, stearic acid, oleic acid, and combinations thereof.
[0022] In an embodiment of the present disclosure, there is provided an opaque
soap bar as described herein, wherein the at least one sodium salt of fatty acid has a
weight percentage in the range of 55 - 73 % with respect to the opaque soap bar
and is selected from the group consisting of sodium salts of palmitic acid, lauric
acid, myristic acid, stearic acid, oleic acid, and combinations thereof.
[0023] In an embodiment of the present disclosure, there is provided an opaque
soap bar as described herein, wherein the at least one sodium salt of fatty acid has a
weight percentage in the range of 55 - 65 % with respect to the opaque soap bar
and is selected from the group consisting of sodium salts of palmitic acid, lauric
acid, myristic acid, stearic acid, oleic acid, and combinations thereof.
[0024] In an embodiment of the present disclosure, there is provided an opaque
soap bar as described herein, wherein the at least one sodium salt of fatty acid is a
combination of sodium salts of palmitic acid, lauric acid, myristic acid, stearic acid,
and oleic acid.
[0025] In an embodiment of the present disclosure, there is provided an opaque
soap bar as described herein, wherein the organic content optionally comprises at
least one thickening agent having a weight percentage in the range of 0.01 - 0.5 %
with respect to the opaque soap bar and is selected from the group consisting of
poly(ethylene) oxide polymers, silicates, trisodium citrate, sodium citrate, cellulose
and its derivatives, starch, and combinations thereof.
[0026] In an embodiment of the present disclosure, there is provided an opaque
soap bar as described herein, wherein the organic content optionally comprises at
least one thickening agent having a weight percentage in the range of 0.02 - 0.3 %
with respect to the opaque soap bar and is poly(ethylene) oxide polymer.
[0027] In an embodiment of the present disclosure, there is provided an opaque
soap bar as described herein, wherein the organic content optionally comprises at

least one thickening agent having a weight percentage in the range of 0.02 - 0.1 %
with respect to the opaque soap bar and is poly(ethylene) oxide polymer.
[0028] In an embodiment of the present disclosure, there is provided an opaque
soap bar as described herein, wherein the at least one humectant has a weight
percentage in the range of 2.0 – 5.0 % with respect to the opaque soap bar and is
selected from the group consisting of light liquid paraffin, glycerine, sorbitol,
propylene glycol, polyethylene glycol-8 (PEG-8), mineral oil, and combinations
thereof.
[0029] In an embodiment of the present disclosure, there is provided an opaque
soap bar as described herein, wherein the at least one humectant has a weight
percentage in the range of 2.5 – 4.5 % with respect to the opaque soap bar and is a
combination of light liquid paraffin, and glycerine.
[0030] In an embodiment of the present disclosure, there is provided an opaque
soap bar as described herein, wherein the at least one surfactant has a weight
percentage in the range of 4 - 12 % with respect to the opaque soap bar and is
selected from the group consisting of sodium lauryl ether sulfate, alpha olefin
sulfonate, decyl glucoside, sodium lauryl sarcocinate, cocoyl amino propyl beatain
(CAPB), and combinations thereof.
[0031] In an embodiment of the present disclosure, there is provided an opaque
soap bar as described herein, wherein the at least one surfactant has a weight
percentage in the range of 6 – 12 % with respect to the opaque soap bar and is
selected from the group consisting of sodium lauryl ether sulfate, alpha olefin
sulfonate, decyl glucoside, sodium lauryl sarcocinate, cocoyl amino propyl beatain
(CAPB), and combinations thereof.
[0032] In an embodiment of the present disclosure, there is provided an opaque
soap bar as described herein, wherein the at least one surfactant has a weight
percentage in the range of 6 – 12 % with respect to the opaque soap bar and is
alpha olefin sulfonate. In another embodiment of the present disclosure the at least
one surfactant is sodium lauryl ether sulfate. In another embodiment of the present
disclosure the at least one surfactant is a combination of sodium lauryl ether sulfate
and alpha olefin sulfonate.

[0033] In an embodiment of the present disclosure, there is provided an opaque soap bar as described herein, wherein the at least one inorganic filler is selected from the group consisting of talc, sodium carbonate, bentonite clay, kaolin clay, sodium chloride, titanium dioxide, and combinations thereof.
[0034] In an embodiment of the present disclosure, there is provided an opaque soap bar as described herein, wherein the at least one inorganic filler is selected from the group consisting of talc, kaolin clay, sodium carbonate, sodium chloride, titanium dioxide, and combinations thereof.
[0035] In an embodiment of the present disclosure, there is provided an opaque soap bar comprising: organic content comprising i) at least one sodium salt of fatty acid having a weight percentage in the range of 54 - 75 % with respect to the opaque soap bar and is selected from the group consisting of sodium salts of palmitic acid, lauric acid, myristic acid, stearic acid, oleic acid and combinations thereof; ii) at least one humectant having a weight percentage in the range of 2.0 – 5.0 % with respect to the opaque soap bar and is selected from the group consisting of light liquid paraffin, glycerine, sorbitol, propylene glycol, polyethylene glycol-8 (PEG-8), mineral oil, and combinations thereof; and iii) at least one surfactant having a weight percentage in the range of 4 - 12 % with respect to the opaque soap bar and is selected from the group consisting of sodium lauryl ether sulfate, alpha olefin sulfonate, decyl glucoside, sodium lauryl sarcocinate, cocoyl amino propyl beatain (CAPB), and combinations thereof; at least one inorganic filler is selected from the group consisting of talc, sodium carbonate, bentonite clay, kaolin clay, sodium chloride, titanium dioxide, and combinations thereof; and water, wherein the at least one inorganic filler to the organic content weight ratio is in the range of 1:5 to 1:8.
[0036] In an embodiment of the present disclosure, there is provided an opaque soap bar comprising: organic content comprising i) at least one sodium salt of fatty acid having a weight percentage in the range of 54 - 75 % with respect to the opaque soap bar and is selected from the group consisting of sodium salts of palmitic acid, lauric acid, myristic acid, stearic acid, oleic acid and combinations thereof; ii) at least one humectant having a weight percentage in the range of 2.0 –

5.0 % with respect to the opaque soap bar and is selected from the group consisting of light liquid paraffin, glycerine, sorbitol, propylene glycol, polyethylene glycol-8 (PEG-8), mineral oil, and combinations thereof; iii) at least one surfactant having a weight percentage in the range of 4 - 12 % with respect to the opaque soap bar and is selected from the group consisting of sodium lauryl ether sulfate, alpha olefin sulfonate, decyl glucoside, sodium lauryl sarcocinate, cocoyl amino propyl beatain (CAPB), and combinations thereof; and iv) at least one thickening agent having a weight percentage in the range of 0.01 - 0.5 % with respect to the opaque soap bar and is selected from the group consisting of poly(ethylene) oxide polymers, silicates, trisodium citrate, sodium citrate, cellulose and its derivatives, starch, and combinations thereof; at least one inorganic filler is selected from the group consisting of talc, sodium carbonate, bentonite clay, kaolin clay, sodium chloride, titanium dioxide, and combinations thereof; and water, wherein the at least one inorganic filler to the organic content weight ratio is in the range of 1:5 to 1:8. [0037] In an embodiment of the present disclosure, there is provided an opaque soap bar as described herein, wherein the opaque soap bar has a density in the range of 1.02 - 1.1 g/cc. In another embodiment of the present disclosure the opaque soap bar has a maximum density of 1.1 g/cc.
[0038] In an embodiment of the present disclosure, there is provided an opaque soap bar comprising: organic content comprising i) at least one sodium salt of fatty acid; ii) at least one humectant; and iii) at least one surfactant; at least one inorganic filler; and water, wherein the at least one inorganic filler to the organic content weight ratio is in the range of 1:5 to 1:8 and wherein the opaque soap bar has a density in the range of 1.02 - 1.1 g/cc. The opaque soap as described herein has an acceptable density in spite of the high at least one inorganic filler to the organic content weight ratio.
[0039] In an embodiment of the present disclosure, there is provided an opaque soap bar comprising: a) organic content having weight percentage in the range of 60 – 80 % with respect to the opaque soap bar; b) at least one inorganic filler having weight percentage in the range of 10 – 15 % with respect to the opaque soap

bar; and c) water having weight percentage in the range of 18 – 22 % with respect to the opaque soap bar.
[0040] In an embodiment of the present disclosure, there is provided an opaque soap bar comprising: a) organic content having weight percentage in the range of 62 – 78 % with respect to the opaque soap bar; b) at least one inorganic filler having weight percentage in the range of 11 – 14 % with respect to the opaque soap bar; and c) water having weight percentage in the range of 18.5 – 21.5 % with respect to the opaque soap bar.
[0041] In an embodiment of the present disclosure, there is provided an opaque soap bar comprising: a) organic content having weight percentage in the range of 62 – 75 % with respect to the opaque soap bar; b) at least one inorganic filler having weight percentage in the range of 11 – 13.5 % with respect to the opaque soap bar; and c) water having weight percentage in the range of 18.5 – 21.0 % with respect to the opaque soap bar.
[0042] In an embodiment of the present disclosure, there is provided an opaque
soap bar as described herein, wherein the opaque soap bar further comprises at
least one cosmetically acceptable excipient selected from the group consisting of
chelating agent, preservative, fragrance, colorant, and combinations thereof.
[0043] In an embodiment of the present disclosure, there is provided an opaque
soap bar comprising: organic content comprising i) at least one sodium salt of fatty
acid; ii) at least one humectant; and iii) at least one surfactant; at least one
inorganic filler; water; and chelating agent having a weight percentage in the range
of 0.001 – 0.1 % with respect to the composition, and the chelating agent is
selected from the group consisting of sodium citrate,
ethylenediaminetetraacetic acid (EDTA), 1-hydroxyethane 1,1-diphosphonic acid (EHDP), citric acid, boric acid, and combinations thereof, wherein the at least one inorganic filler to the organic content weight ratio is in the range of 1:5 to 1:8. In another embodiment of the present disclosure the chelating agent is sodium citrate. [0044] In an embodiment of the present disclosure, there is provided an opaque soap bar comprising: organic content comprising i) at least one sodium salt of fatty acid; ii) at least one humectant; and iii) at least one surfactant; at least one

inorganic filler; water; and preservative has a weight percentage in the range of 0.001 – 1.0 % with respect to the composition, chelating agent having a weight percentage in the range of 0.001 – 0.1 % with respect to the composition, and the chelating agent is selected from the group consisting of sodium citrate, ethylenediaminetetraacetic acid (EDTA), 1-hydroxyethane 1,1-diphosphonic acid (EHDP), citric acid, boric acid, and combinations thereof; and the preservative is selected from the group consisting of sodium metabisulfite, butylated hydroxy toluene (BHT), imidazolidine-2,4-dione (hydantoin), phenoxy ethanol, trisodium citrate, sodium citrate and combinations thereof, wherein the at least one inorganic filler to the organic content weight ratio is in the range of 1:5 to 1:8. In another embodiment of the present disclosure the preservative is butylated hydroxy toluene (BHT).
[0045] In an embodiment of the present disclosure, there is provided an opaque soap bar comprising: organic content comprising i) at least one sodium salt of fatty acid; ii) at least one humectant; and iii) at least one surfactant; at least one inorganic filler; water; and preservative has a weight percentage in the range of 0.001 – 1.0 % with respect to the composition, chelating agent having a weight percentage in the range of 0.001 – 0.1 % with respect to the composition, and the chelating agent is selected from the group consisting of sodium citrate, ethylenediaminetetraacetic acid (EDTA), 1-hydroxyethane 1,1-diphosphonic acid (EHDP), citric acid, boric acid, and combinations thereof; the preservative is selected from the group consisting of sodium metabisulfite, butylated hydroxy toluene (BHT), imidazolidine-2,4-dione (hydantoin), phenoxy ethanol, and combinations thereof; and fragrance has a weight percentage in the range of 1.0 – 1.5 % with respect to the composition, and the fragrance is selected from commonly available IFRA certified fragrances, wherein the at least one inorganic filler to the organic content weight ratio is in the range of 1:5 to 1:8.
[0046] In an embodiment of the present disclosure, there is provided an opaque soap bar comprising: organic content comprising i) at least one sodium salt of fatty acid; ii) at least one humectant; and iii) at least one surfactant; at least one inorganic filler; water; and preservative has a weight percentage in the range of

0.001 – 1.0 % with respect to the composition, chelating agent having a weight percentage in the range of 0.001 – 0.1 % with respect to the composition, and the chelating agent is selected from the group consisting of sodium citrate, ethylenediaminetetraacetic acid (EDTA), 1-hydroxyethane 1,1-diphosphonic acid (EHDP), citric acid, boric acid, and combinations thereof; the preservative is selected from the group consisting of sodium metabisulfite, butylated hydroxy toluene (BHT), imidazolidine-2,4-dione (hydantoin), phenoxy ethanol, trisodium citrate, sodium citrates, and combinations thereof; fragrance has a weight percentage in the range of 1.0 – 1.5 % with respect to the composition, and the fragrance is selected from commonly available IFRA certified fragrances; and colorant has a weight percentage in the range of 0.00001 – 0.5 % with respect to the composition, and the colorant is selected from commonly available BIS approved colorants, wherein the at least one inorganic filler to the organic content weight ratio is in the range of 1:5 to 1:8.
[0047] In an embodiment of the present disclosure, there is provided a process for preparing an opaque soap bar comprising: organic content comprising i) at least one sodium salt of fatty acid; ii) at least one humectant; and iii) at least one surfactant; at least one inorganic filler; and water, wherein the at least one inorganic filler to the organic content weight ratio is in the range of 1:5 to 1:8, said process comprising: a) obtaining at least one sodium salt of fatty acid; b) obtaining at least one humectant; c) obtaining at least one surfactant; d) obtaining at least one inorganic filler; e) contacting at least one sodium salt of fatty acid, at least one humectant, at least one surfactant and at least one inorganic filler with water to obtain a soap mass; and f) processing the soap mass to obtain the opaque soap bar. [0048] In an embodiment of the present disclosure, there is provided a process for preparing an opaque soap bar comprising: organic content comprising i) at least one sodium salt of fatty acid; ii) at least one humectant; iii) at least one surfactant; and iv) at least one thickening agent; at least one inorganic filler; water; preservative; and chelating agent, wherein the at least one inorganic filler to the organic content weight ratio is in the range of 1:5 to 1:8, said process comprising: a) contacting at least one sodium salt of fatty acid, at least one humectant, at least

one surfactant, at least one inorganic filler, at least one thickening agent, preservative and chelating agent with water to obtain a soap mass; and b) processing the soap mass to obtain the opaque soap bar.
[0049] In an embodiment of the present disclosure, there is provided a process for preparing an opaque soap bar as described herein, wherein a) contacting at least one sodium salt of fatty acid, at least one humectant, at least one surfactant, at least one inorganic filler, at least one thickening agent, preservative and chelating agent with water is carried out at a temperature in the range of 25 – 45 ℃ at stirring in the range of 40 – 60 rpm for a period in the range of 10 – 25 min to obtain a soap mass; and b) processing the soap mass comprises extruding, stamping, cutting, and combinations thereof to obtain the opaque soap bar.
[0050] In an embodiment of the present disclosure, there is provided a process for preparing an opaque soap bar as described herein, wherein a) contacting at least one sodium salt of fatty acid, at least one humectant, at least one surfactant, at least one inorganic filler, at least one thickening agent, preservative and chelating agent with water is carried out at a temperature in the range of 26 – 43 ℃ at stirring in the range of 42 – 58 rpm for a period in the range of 12 – 23 min to obtain a soap mass; and b) processing the soap mass comprises extruding, stamping, cutting, and combinations thereof to obtain the opaque soap bar.
[0051] In an embodiment of the present disclosure, there is provided a process for preparing an opaque soap bar as described herein, wherein a) contacting at least one sodium salt of fatty acid, at least one humectant, at least one surfactant, at least one inorganic filler, at least one thickening agent, preservative and chelating agent with water is carried out at a temperature in the range of 28 – 40 ℃ at stirring in the range of 45 – 55 rpm for a period in the range of 15 – 20 min to obtain a soap mass; and b) processing the soap mass comprises extruding, stamping, cutting, and combinations thereof to obtain the opaque soap bar.
[0052] In an embodiment of the present disclosure, there is provided a process for preparing an opaque soap bar comprising: organic content comprising i) at least one sodium salt of fatty acid; ii) at least one humectant; iii) at least one surfactant; and iv) at least one thickening agent; at least one inorganic filler; water;

preservative; and chelating agent, wherein the at least one inorganic filler to the organic content weight ratio is in the range of 1:5 to 1:8, said process comprising: a) contacting at least one sodium salt of fatty acid, at least one humectant, at least one surfactant, at least one inorganic filler, at least one thickening agent, preservative and chelating agent with water is carried out at a temperature in the range of 25 – 45 ℃ at stirring in the range of 40 – 60 rpm for a period in the range of 10 – 25 min to obtain a soap mass; and b) processing the soap mass comprises extruding, stamping, cutting, and combinations thereof to obtain the opaque soap bar.
[0053] Although the subject matter has been described in considerable detail with reference to certain examples and implementations thereof, other implementations are possible.
EXAMPLES
[0054] The disclosure will now be illustrated with working examples, which is 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 compositions, the exemplary methods, devices and materials are described herein. It is to be understood that this disclosure is not limited to particular methods, and experimental conditions described, as such methods and conditions may apply. [0055] The examples section discloses a table mentioning the working range of all the essential components used in the preparation of the soap bar as described in the disclosure. The working range table (Table 1) is succeeded by another set of tables (Table 2 and Table 3) mentioning the working and non-working examples of the soap bar composition. The working examples comprise compositions lying within the disclosed working weight ratio of at least one inorganic filler to the organic content, i.e., at least 1:5, whereas, the non-working examples refer to compositions having weight ratio of at least one inorganic filler to the organic content below 1:5.

The examples further provide a convenient process for obtaining the opaque soap bar (Example 3).
Example 1
Working range various components
[0056] An opaque soap bar as described in the present disclosure comprises
sodium salt of fatty acids, inorganic fillers, surfactants, chelating agent,
preservatives, water and thickening agents. The working range of the
aforementioned essential components is described in Table 1.

[0057] The Table 1 above lists some of the essential ingredients in working weight percentages. In addition to the above-mentioned ingredients the opaque soap bar may contain fragrances and colorants as described herein above. It is noteworthy that the opaque soap bar is found to work when the organic content has a weight percentage in the range of 60 – 80 % with respect to the opaque soap bar and the inorganic filler content is in the range of 10 -15 % with respect to the opaque soap bar.
Example 2
Working and Non-working examples
[0058] The Table 2 depicts working examples A-D having all the ingredients within the working range as described in Example 1. Furthermore, Table 3 depicts three non-working examples – E, F, and G, comprising varying amounts of inorganic fillers compared to the working range (Table 1). The examples have been assessed based on the parameters of:
1. Processing ability of the soap;
2. Cracks observed;
3. Mush; and
4. Moisture retention ability.

Working examples
[0059] The working examples A-D were prepared using all the essential ingredients within the working range (as described in Table 1). The essential feature of the examples listed in Table 2 was found to be the high weight ratio of inorganic filler to the organic content (at least 1:5). It can be appreciated from the table (Table 2) that none of the examples display any cracks and also were found to reveal a low mush content as compared to non-working examples (Table 3 below). The high filler content ensured that the examples displayed negligible moisture loss over a period of 24 months. Furthermore, the Examples A-D were found to be

thereof; ** weight ratio of the inorganic filler to the organic content Non-working examples
[0060] The non-working examples have been presented in Table 3 above as E-G. The mush index was also found to be higher and ability to retain moisture was found to be diminished when compared to the working examples (Table 2). Also, none of the examples were found to be compatible with conventional soap

processing techniques. All the mentioned examples were tested with inorganic filler to the organic content with weight ratio lower than 1:5 or higher than 1:8. [0061] The non-working example E was found to be have a weight ratio of the inorganic filler to the organic content below the desired lower limit of 1:5. Though the overall density of the soap bar was found to be acceptable (~ 1.1), the lower filler content (inorganic filler to organic content - 1:3.18) can be seen to negatively affect all necessary parameters including the moisture retention ability. [0062] On comparison of Example E and the Table 2, it appears that a high inorganic filler content is desirable. Accordingly, weight ratios higher than 1:8 for the inorganic filler to the organic content were tested in Examples F and G. The opaque soap bar was found to be unacceptable on account of all parameters including high mush factor and cracking. In particular, the increased inorganic filler content lead to an undesirably high density in the opaque soap bars. [0063] Overall, it is distinctly displayed that all the essential elements need to be within the working range for production of a soap bar which is desirable with respect to all parameters. Thorough experimentation was carried out to ascertain the narrow working ratio between the inorganic filler and the organic content for obtaining the opaque soap bar. Even slight deviation from this working ratio was not acceptable for formulating the opaque soap bar using the ingredients as disclosed in the present disclosure. The results of Table 2 indicate that the examples adhering to the weight ratio between inorganic fillers and organic content allowed soap bars to be obtained with low density (~1.1) despite usage of high amounts of inorganic fillers.
Example 3
Process for preparing an opaque soap bar
[0064] The process for preparing the soap bar as disclosed in the present disclosure provides an easy and cost-effective route for obtaining the opaque soap bar. The process was used to conveniently prepare the listed Examples A-G (Tables 2 and

[0065] The process comprised the steps of: a) at least one sodium salt of fatty acid, at least one humectant, at least one surfactant, at least one inorganic filler, at least one thickening agent, preservative and chelating agent was mixed with water. The mixture was maintained at a temperature in the range of 25 – 45 ℃ at stirring in the range of 40 – 60 rpm for a period in the range of 10 – 25 min to obtain a soap mass; and b) the soap mass was processed using conventional techniques of extruding, stamping, cutting, etc to obtain the opaque soap bar.
Advantages of the present disclosure:
[0066] The present disclosure reveals a low-density opaque soap bar and process for preparing the opaque soap bar. The soap bar thus prepared is crack-free, contains high moisture retention capacity over a long shelf period and displays less mush. It was also found to be compatible with conventional soap making technique involving the steps of extrusion, cutting, and stamping. The unique ratio between organic content and the inorganic filler helps incorporate a high inorganic filler content, thus making the opaque soap bar acceptable in terms of both density and cost-effectiveness.

I/We Claim:
1. An opaque soap bar comprising:
a) organic content comprising i) at least one sodium salt of fatty acid; ii) at least one humectant; and iii) at least one surfactant;
b) at least one inorganic filler; and
c) water,
wherein the at least one inorganic filler to the organic content weight ratio is in the range of 1:5 to 1:8.
2. The opaque soap bar as claimed in claim 1, wherein the at least one sodium salt of fatty acid has a weight percentage in the range of 54 - 75 % with respect to the opaque soap bar and is selected from the group consisting of sodium salts of palmitic acid, lauric acid, myristic acid, stearic acid, oleic acid and combinations thereof.
3. The opaque soap bar as claimed in claim 2, wherein the at least one sodium salt of fatty acid is a combination of sodium salts of palmitic acid, lauric acid, myristic acid, stearic acid and oleic acid.
4. The opaque soap bar as claimed in claim 1, wherein the organic content optionally comprises at least one thickening agent having a weight percentage in the range of 0.01 - 0.5 % with respect to the opaque soap bar and is selected from the group consisting of poly(ethylene) oxide polymers, silicates, trisodium citrate, sodium citrate, cellulose and its derivatives, starch, and combinations thereof.
5. The opaque soap bar as claimed in claim 1, wherein the at least one humectant has a weight percentage in the range of 2.0 – 5.0 % with respect to the opaque soap bar and is selected from the group consisting of light liquid paraffin, glycerine, sorbitol, propylene glycol, polyethylene glycol-8 (PEG-8), mineral oil, and combinations thereof.
6. The opaque soap bar as claimed in claim 1, wherein the at least one surfactant has a weight percentage in the range of 4 - 12 % with respect to the opaque soap bar and is selected from the group consisting of sodium lauryl ether sulfate, alpha olefin sulfonate, decyl glucoside, sodium lauryl

sarcocinate, cocoyl amino propyl beatain (CAPB), and combinations thereof.
7. The opaque soap bar as claimed in claim 1, wherein the at least one inorganic filler is selected from the group consisting of talc, sodium carbonate, bentonite clay, kaolin clay, sodium chloride, titanium dioxide, and combinations thereof.
8. The opaque soap bar as claimed in any of the claims 1-7, wherein the opaque soap bar has a density in the range of 1.02 - 1.1 g/cc.
9. The opaque soap bar as claimed in any of the claims 1-8 comprising:

a) organic content having weight percentage in the range of 60 – 80 % with respect to the opaque soap bar;
b) at least one inorganic filler having weight percentage in the range of 10 – 15 % with respect to the opaque soap bar; and
c) water having weight percentage in the range of 18 – 22 % with respect to the opaque soap bar.
10. The opaque soap bar as claimed in any of the claims 1 or 9, wherein the
opaque soap bar further comprises at least one cosmetically acceptable
excipient selected from the group consisting of chelating agent,
preservative, fragrance, colorant, and combinations thereof.
11. The opaque soap bar as claimed in claim 8, wherein the chelating agent has
a weight percentage in the range of 0.001 – 0.1 % with respect to the
composition, and the chelating agent is selected from the group consisting
of sodium citrate, ethylenediaminetetraacetic acid (EDTA), 1-
hydroxyethane 1,1-diphosphonic acid (EHDP), citric acid, boric acid, and
combinations thereof; and preservative has a weight percentage in the range
of 0.001 – 1.0 % with respect to the composition, and the preservative is
selected from the group consisting of sodium metabisulfite, butylated
hydroxy toluene (BHT), imidazolidine-2,4-dione (hydantoin), phenoxy
ethanol, trisodium citrate, sodium citrate and combinations thereof.
12. A process for preparing an opaque soap bar as claimed in claim 1, said
process comprising:

a) obtaining at least one sodium salt of fatty acid;
b) obtaining at least one humectant;
c) obtaining at least one surfactant;
d) obtaining at least one inorganic filler;
e) contacting at least one sodium salt of fatty acid, at least one humectant, at least one surfactant and at least one inorganic filler with water to obtain a soap mass; and
f) processing the soap mass to obtain the opaque soap bar.
13. A process for preparing an opaque soap bar as claimed in any of the claims
1-11, said process comprising:
a) contacting at least one sodium salt of fatty acid, at least one humectant, at least one surfactant, at least one inorganic filler, at least one thickening agent, preservative and chelating agent with water to obtain a soap mass; and
b) processing the soap mass to obtain the opaque soap bar.
14. The process for preparing an opaque soap bar as claimed in claim 13,
wherein
a) contacting at least one sodium salt of fatty acid, at least one humectant, at least one surfactant, at least one inorganic filler, at least one thickening agent, preservative and chelating agent with water is carried out at a temperature in the range of 25 – 45 ℃ at stirring in the range of 40 – 60 rpm for a period in the range of 10 – 25 min to obtain a soap mass; and
b) processing the soap mass comprises extruding, stamping, cutting, and combinations thereof to obtain the opaque soap bar.