KR100235692B1 - Transparent personal cleansing bar - Google Patents

Abstract

The present invention relates to a transparent injection molded personal cleansing bar exhibiting the desired hardness properties.

These transparent bars are gentle, less sticky and exhibit good foaming properties.

The transparent bar of the present invention comprises soap 18 bar to 35 bar, wherein the soap comprises at least 50% insoluble sodium soap; 14 bar to 32 bar water, 5 bar to 37 bar foam forming synthetic surfactant, wherein the soap bubble forming synthetic surfactant has a critical micelle concentration equilibrium surface tension of 10 to 50 dynes / cm as measured at 25 ° C. and 18 parts to 37 parts of water-soluble organic solvent.

Description

[Name of invention]

Transparent Human Cleaning Bar

[Technical Field]

The present invention relates to transparent and translucent pour molded personal cleansing bars. These bars are mild, low smearing and exhibit good foaming characteristics. These bars also have the desired hardness properties.

[Background]

Transparent human cleansing bars are well known in the art and appeal to many consumers. Unfortunately, a manufacturing problem for transparent human cleansing bars is that the bars are too coarse or undesirably soft as in the case of bars containing high levels of soap. For example, US Pat. No. 5,041,234 to Inston et al., Issued August 20, 1991, discloses a transparent bar (high soap content bar) containing at least 40 parts of soap.

As with other “high soap content” transparents, what is disclosed by Inston et al. Has good foaming, less sticking and good bar hardness. However, these high soap content clear bars are rather rough on the skin. Another drawback of this bar is that its manufacturing process generally requires the use of undesirable solvents such as volatile short chain monohydric alcohols, or the need for special grinding to achieve transparency.

Transparent bars with less soap content are also known in the art. The less transparent soap bar contains less than 40 parts of soap. Chambers and Inston, U.S. Patent No. 5,002,685, issued March 26, 1991, discloses 25 to 34% soap, 5 to 15% monohydric alcohol, 15 to 30% sugar and / or cyclic polyols, And transparent bars made from 15 to 30% of water. However, soap mixtures such as chambers consist of 18 to 26% soluble soap and 8 to 16% insoluble soap. Thus, transparent bars such as chambers are mostly made of soluble soap. Unfortunately, human cleansing bars containing less than 50% insoluble soap (eg, 50% or more soluble soap) may be unacceptably brittle.

However, Chambers does not really teach the use of high content of insoluble soap. In particular, Chambers et al. Reported that what was disclosed in Examples 37 and 38, containing 30 to 20% by weight of insoluble soap and 10% by weight or less of soap, had inferior use properties by small amounts of soluble soap. (Columns 8, 11, 1-3) The processing of bars such as chambers also requires the use of unwanted volatile monohydric alcohol solvents.

Gordon, U.S. Patent No. 4,165,293, issued August 21, 1979, also discloses a human cleansing bar wherein the soap component comprises less than 50% insoluble soap.

Particularly, the hungry is mainly… Disclosed is a monohydric alcohol-free process for producing a transparent soap bar made from tallow soap soap.

It should be noted here that “tallow soap” typically consists of about 51% by weight of soluble soap and can therefore be characterized as roughly soluble soap.

Furthermore, it is preferred that the clear soap bar disclosed by Godon comprises a blend of 80-90% tallow soap and 10-20% coconut soap.

The soap component of the transparent bar will comprise 55% to 59% soluble soap.

United States Patent No. 5,264,144 to Moroney et al., Issued November 23, 1993, and US Pat. No. 5,340,492 to Kacher et al., Issued August 23, 1994, describe fatty acid soaps (both flexible and insoluble soaps). And water and synthetic surfactants (ie, anionic, zwitterionic and nonionic). However, the human body cleaning bar taught by Moroni et al. Is not transparent and the human body cleaning bar taught by Kasher et al. Is not always transparent. Indeed, even in any reference, transparent cleaning bars have no teaching on manufacturing.

It has now been found by the present invention that the human cleansing bar containing 18 to 35 parts of a soap comprising at least 50% insoluble soap exhibits transparent and satisfactory hardness characteristics. These human cleansing bars are also gentle to the skin, less sticky and exhibit excellent foaming characteristics. Furthermore, the production of these transparent bars does not require the use of monohydric alcohols.

[Summary of invention]

The present invention relates to a transparent injection molded human cleansing bar exhibiting the desired hardness characteristics. These transparent bars are gentle, less sticky and exhibit good foaming characteristics.

The transparent bar of the present invention comprises 18 to 35 parts of a soap comprising at least 50% of insoluble sodium soap; 14 parts to 32 parts of water; 5 to 37 parts of foam forming synthetic surfactant having a critical micelle concentration equilibrium surface tension of 10 to 50 dynes / cm as measured at 25 ° C .; And 18 parts to 37 parts of water-soluble organic solvent, and the amount of water and water-soluble organic solvent combined is 40 parts or more.

Detailed description of the invention

The present invention relates to a transparent injection molded human cleansing bar exhibiting the desired hardness properties. These transparent bars are gentle, less sticky and exhibit good foaming characteristics.

The transparent bar of the present invention comprises (A) 18 to 35 parts of a soap comprising at least 50% insoluble sodium soap; (B) 5 to 37 parts of a foam forming synthetic surfactant having a critical micelle concentration equilibrium surface tension of 10 to 50 dynes / cm as measured at 25 ° C .; (C) 14 to 32 parts of water; And (D) 18 parts to 37 parts of water-soluble organic solvent.

In the present invention, this bar is considered transparent if a 14 point type can be read through a 1/4 inch thick bar.

If a 14 point type cannot be read through a 1/4 inch thick bar, the bar is not transparent. See Kodon U.S. Patent 4,165,293, incorporated herein by reference on August 21, 1979, incorporated herein by reference.

As used herein, the term “insoluble soap” refers to a fatty acid sodium soap that is less soluble than sodium myristate.

The transparent bars of the present invention are preferably prepared without the use of monohydric alcohols. As a result, the transparent bar of the present invention is very stable in weight.

Alcohol free bars can also be made more economically.

Some volatile monohydric alcohols (eg ethanol, propanol, butanol) can be used. However, a preferred aspect of the present invention is essentially free of monohydric alcohols. Care must be taken when using monohydric alcohol solvents due to the potential explosion characteristics.

The amounts, parts, percentages, and ratios indicated in the present invention are by weight unless otherwise indicated. “Soap mixture” is expressed in the present invention as “wt% of soap”. On the other hand, the moiety used in the present invention is used as the weight part of the finished bar. All numerical limits, ranges, ratios, etc., are approximate unless otherwise noted.

The individual components of the transparent human cleansing bar of the present invention and the specific manner in which these components are preferably combined are described in detail below.

[soap]

The transparent bar comprises about 18 parts to about 35 parts of soap, preferably about 20 parts to about 32 parts, more preferably about 24 parts to about 32 parts. Surprisingly, no clear bar is produced at a soap content above about 35 parts, and an unacceptably soft bar at a soap content below about 18 parts.

The soap mixture of the present invention comprises at least 50% of insoluble sodium soap, preferably 50% to about 87%, more preferably about 53% to about 72%. Transparent bars in which the soap component contains less than 50% insoluble soap may be undesirably soft.

As described above, the term “insoluble soap” is defined as fatty acid sodium soap that is less soluble than sodium myristate. In particular, the term “insoluble soap” refers to a monovalent salt of saturated fatty monocarboxylic acid having a carbon chain length of 16 to 24, preferably 18 to 24. These monovalent salts will usually be sodium salts, but some cations such as K, Mg or alkanolammonium ions can be used. Preferred insoluble fatty acid soaps are selected from the group consisting of sodium palmitate and sodium stearate and mixtures thereof. Other insoluble soaps, in particular higher fatty acid insoluble soaps, may also be used.

The rest of the soap mixture is soluble soap. The term “soluble” soap refers to monovalent salts of saturated fatty monocarboxylic acids having a carbon chain length of 8 to 14 and further monovalent salts of oleic acid and polyunsaturated fatty monocarboxylic acids having a carbon chain length of 8 to 22. Sodium myristate is defined herein as "soluble" soap.

Preferred soluble soaps are selected from the crowd consisting of myristic acid, oleic and lauric acid soaps and mixtures thereof.

Fatty acid soaps used in the transparent bars of the present invention are prepared using fatty acid mono, di or triglycerides or oils consisting of pure chains or in suitable amounts and ratios of conventional fatty acid and oil mixtures, such as coconut, palm oil stearin, tallow And triple compressed stearic acid.

The term “coconut” in connection with a soap or fatty acid mixture herein refers to C ₈ 8%; C ₁₀ 7%; C ₁₂ 48%; C ₁₄ 17.5%; C ₁₆ 9%; C ₁₈ 2%; Refers to a material having an approximate carbon chain length distribution of 6% oleic acid and 2.5% linoleic acid. Thus, coconut soap comprises about 11% insoluble soap and 89% soluble soap.

The term “babassu” in connection with a soap or fatty acid mixture herein refers to C ₈ 6%; C ₁₀ 3%, C ₁₂ 46%; C ₁₄ 20%; C ₁₆ 7%; And a material having an approximate carbon chain length distribution of 18% C _{18: 1} oleic acid. Thus, Babasu Soap contains about 7% insoluble soap and 93% soluble soap.

The term “triple pressed stearic acid” as defined herein refers to an approximate carbon chain length of 5% myristic acid (C ₁₄ ), 50% palmitic acid (C ₁₆ ) and 45% stearic acid (C ₁₈ ) Refers to a fatty acid with a distribution. Thus triple compressed stearic acid soap comprises about 95% insoluble soap and 5% soluble soap.

The term “cured tallow” has an approximate carbon chain length distribution of 3% myristic acid (C ₁₄ ), 50% palmitic acid (C ₁₆ ) and 45% stearic acid (C ₁₈ ) and 2% oleic acid Refers to fatty substances. The cured tallow soap thus comprises about 95% insoluble soap and 5% soluble soap.

In contrast, the term phthalalupurin refers to soaps with approximate carbon chain length distributions of C ₁₄ 4%, C ₁₆ 29%, C ₁₈ 20%, palmitooleic acid 2%, oleic acid 42% and linoleic acid 3%. Defined as a mixture, it is defined as having a standardized midrange value as can be seen from Table 6.34 of Bailey's Industrial Oil and Fat Products, Volume 1, Wiley Intersciences. Thus, the tallow soap comprises about 49% insoluble soap and 51% soluble soap.

The amount of free fatty acids incorporated into the finished bar of the present invention is typically in the range of 0.5 parts to 3 parts, more typically 1 to 2 parts. However, free fatty acids are not essential.

It is preferable to introduce the free fatty acid component into the soap mixture of the present invention by adding fatty acids to the soap mixture after saponification of the soap mixture has taken place. The free fatty acid component can also be introduced as a premix of soap and free fatty acids, for example as an acid reaction mixture of soap and free fatty acids produced by neutralization in the soap preparation process.

Fatty acid soaps of the present invention include sodium soap. However, non-sodium soaps such as potassium, magnesium and / or triethanolalmonium (TEA) soaps may also be acceptable in small amounts.

Such non-sodium soap, if used, is preferably used in an amount of 0 to 10 parts by weight, preferably 0 to 5 parts by weight of the bar soap.

[water]

The water content in the bar ranges from about 14 parts to about 32 parts, preferably from about 18 parts to about 27 parts, more preferably from about 22 parts to about 26 parts. Higher water contents within the above preferred ranges are more desirable for ease of processing, mildness of bars and other benefits.

The water content in the human cleansing bar of the present application is important for obtaining a transparent bar having desirable hardness characteristics. When water is less than about 14 parts by weight of the bar, the bar may not be transparent. When the amount of water present in the bar exceeds about 32 parts by weight of the bar, the bar may be unacceptably soft.

[Surfactants]

The amount of foam forming synthetic surfactant in the bar ranges from about 5 parts to about 37 parts by weight, preferably from about 10 parts to about 28 parts by weight, more preferably from about 12 parts to about 22 parts by weight of the finished bar. to be. Synthetic surfactants are needed to improve the properties of the bars. Some of the above properties include bubble formation / bubble generation properties, bar purity, bar rinsing feeling and sticking / hardness properties.

The bar composition comprises a foam forming synthetic surfactant selected from the group consisting of anionic surfactants, nonionic surfactants, zwitterionic surfactants, zwitterionic surfactants, and mixtures thereof. Foam forming surfactants are described herein as synthetic surfactants or mixtures of surfactants having an equilibrium surface tension of 10 to 50 dynes / cm, more preferably 20 to 45 dynes / cm as measured at CMC (critical micelle concentration) at 25 ° C. Is defined in. Some surfactant mixtures have a lower surface tension than some of their parts. As a result, it is possible to use both a low foaming surfactant, a high surfactant, a high water-soluble surfactant and a low water-soluble surfactant in the bar composition of the present invention. Particular preference is given to synthetic detergent surfactants and / or foam-enhancing synthetic detergent surfactants known as good dispersants for soap cores formed in hard water.

Preferred choices for foam forming synthetic surfactants include mixtures of anionic surfactants and zwitterionic / cationic surfactants. Addition of zwitterionic / cationic surfactants is allowed to increase the purity and foaming properties.

However, their addition also leads to poor structure formation properties in the bar, so the amount of zwitterionic surfactant should be kept below 10 parts. Preferred zwitterionic / zwitterionic surfactants are selected from alkyl ampo mono and di-acetates, alkyl betaines, alkyl sulfines, alkyl amidopropyl betaines, alkyl amidopropyl hydroxides, and mixtures thereof. Wherein the surfactants contain C ₈ to C ₂₂ alkyl chains and mixtures thereof.

Examples of suitable synthetic surfactants for use herein include Zimmerer, U.S. Patent No. 3,351,558, issued Nov. 7, 1967, 6 column 70 lines to 7 column 74 lines; Godon, U.S. Patent No. 4,165,293, issued Aug. 21, 1979; Chambers and Inston, U.S. Patent No. 5,002,685, issued March 26, 1991; US Pat. No. 5,041,234, issued August 20, 1991, which is incorporated herein by reference in its entirety.

The surfactants include alkyl sulfates, anionic acyl sacosinates, methyl acyl taurates, N-acyl glutamate, acyl isethionates, alkyl sulfosulfinates, alkyl phosphate esters, ethoxylated alkyl phosphate esters, trideces sulfates, Protein condensates, mixtures of ethoxylated alkyl sulfates and alkyl amine oxides, betaines, steines and mixtures thereof.

Some preferred surfactants are alkyl ether sulfates having 1 to 12 ethoxy groups, especially ammonium and sodium lauryl ether sulfate.

Particularly interesting synthetic sulfate detergents are the solid alkali metal salts of the sulfuric esters of normal primary aliphatic alcohols having 10 to 22 carbon atoms. Thus, the sodium and potassium salts of alkyl sulfates obtained from mixed higher alcohols derived by reducing tallow or by reducing coconut oil, palm oil, palm kernel oil, palm oil stearin, Babasu nuclear oil or other oils of the coconut group are described herein. Available at

Other aliphatic sulfate esters may be suitably used.

Certain hygroscopic synthetic surfactants commonly used in liquids and very difficult to incorporate into conventional cleaning bars can be used well in the bars of the present invention. Thus, essentially all synthetic surfactants known to be useful in cleaning products are useful in the compositions of the present invention. The cleaning product patent literature fully discloses synthetic surfactants.

Optionally design preferred synthetic surfactant systems for bar appearance, stability, foam formation, washability and purity.

Preferred foam forming synthetic surfactants are acyl isethionate, acyl sacosinate, alkylglycerylether sulfonate, methylacyl taurate, paraffin sulfonate, linear alkyl benzene sulfonate, N-acyl glutamate, alkyl sulfosuccinate Nate, alpha sulfo fatty acid ester, alkyl ether carboxylate, alkyl phosphate ester, ethoxylated alkyl phosphate ester, alpha oleic acid sulfonate, alkyl ether sulfates having 1 to 12 ethoxy groups and mixtures thereof, wherein the surfactant Is an alkyl chain of C ₈ to C ₂₂ ). More preferred are anionic surfactants containing an alkyl chain of C ₈ to C ₁₈ and the counterion selected from the group consisting of Na, K, NH ₄ , N (CH ₂ CH ₂ OH) ₃ .

Some specific examples of preferred surfactants are used in the examples herein. Good Purity, Enhancing Foam Formation Some examples of synthetic detergent surfactants are sodium lauroyl sacosinate, alkyl glyceryl ether sulfonates, sulfonated fatty acid esters and sulfonated fatty acids.

Note that the purity of the active agent can be measured by the skin barrier breaking test used to assess the potential for irritation of the surfactant. The milder the surfactant in this test, the less the skin barrier is destroyed. Skin barrier breakdown is determined by the relative amount of radiolabelled water ( ³ HH ₂ 0) flowing from the test solution through the skin dermis into the physiological buffer water contained in the diffusion chamber. This test is described in TJ Franz, J. Invest. Dermatol., 1975, 64, pp. 190-195 and Small et al., US Pat. No. 4,673,525, issued June 16, 1987. These references disclose a mild alkyl glyceryl ether sulfonate (AGS) surfactant base synbar comprising a "standard" alkyl glyceryl ether sulfonate mixture and define criteria for simple surfactants. . Barrier breaking tests are used to select mild surfactants. Some preferred mild synthetic surfactants are disclosed in Small et al., Cited above.

[menstruum]

The transparent bar of the present invention comprises from about 18 parts to about 37 parts, preferably from about 20 parts to about 32 parts, more preferably from about 20 parts to about 28 parts of a water soluble organic solvent. The water soluble organic solvent is preferably selected from the group consisting of urea, water soluble organic polyols and mixtures thereof. Urea may be used in an amount of 0 to 8 parts, preferably 2 to 7 parts or 3 to 6 parts, but preferably the total amount of polyol and urea does not exceed about 37 parts. Preferred water-soluble organic polyols are propylene glycol, dipropylene glycol, butylene glycol, glycerin and ethylene glycol, 1,7-heptane-diol, mono and polyethylene and propylene glycols having a molecular weight of 8,000 or less and their mono-C _1-4 alkyl Ether, sorbitol, glycerol, mono-, di- and triethanolamine, 2-amino-1-butanol, non-reducing sugars such as sucrose and mixtures thereof.

In use, preferred non-reducing sugars are used in amounts of about 1 to about 10 parts by weight, preferably about 2 to about 7 parts by weight of the bar. Unless specifically stated otherwise, the term “sucrose” as used herein refers to sucrose, derivatives thereof and similar non-reducing sugars and similar polyols that are substantially stable at soap processing temperatures of up to about 210 ° F. Trialose, raffinose and stachyose; And sorbitol, lactitol and maltitol.

A water soluble organic solvent is a necessary component of the present invention necessary for the transparency of the bar. Moreover, the specific amount and type of water soluble organic solvent used is important for optimizing the transparency of the human cleansing bar.

[Combination of Ingredients]

In order to obtain a transparent bar, the human cleansing bar of the present invention must contain a certain combination amount of soap and a water soluble organic solvent. In particular, in addition to the minimum amount of both water and solvent recited above to achieve transparency, a minimum combined amount of 40 parts by weight of the bar, preferably 45 parts by weight of water-soluble organic solvent and water, is essential.

In order to obtain a transparent bar, it is desirable to combine the water-soluble organic solvent, water and soap in the bar at a specific ratio. In particular, it is preferable to combine water and the water-soluble organic solvent in a ratio of about 2: 1 to 1: 2, most preferably about 1: 1 in order to maintain transparency. It is preferred to combine the soap and the water-soluble solvent in a ratio of about 0.8: 1 to about 2: 1, more preferably about 0.8: 1 to 1.5: 1. The ratio of insoluble soap to soluble soap is preferably in the range of about 1.2: 1 to about 2.4: 1, more preferably about 1.7: 1 to about 2.3: 1.

[additive]

The bar soap composition of the present invention may contain other additives commonly included in cosmetic bars such as perfumes, other fillers, fungicides or antibacterial agents, dyes and the like.

Some preferred embodiments of the present invention contain one or more parts of another bar component selected from moisturizers, colorants, fillers, polymeric skin feel and purity aids, perfumes, preservatives and mixtures thereof.

Compatible salts and salt hydrates can be used as fillers. Some preferred salts are sodium chloride, sodium sulfate, disodium hydrogen phosphate, sodium pyrophosphate, sodium tetraborate.

In general, compatible salts and salt hydrates include the sodium, potassium, magnesium, calcium, aluminum, lithium and ammonium salts of inorganic and lower (less than six carbon atoms) carboxylic acids or other organic acids and the corresponding hydrates and their Mixtures can also be applied.

Inorganic salts include chloride, bromide, sulfate, metasilicate, orthophosphate, pyrophosphate, polyphosphate, metaborate, tetraborate and carbonate. Organic salts include acetate, formate, methyl sulfate and citrate.

Water soluble amine salts may also be used. Preference is given to monoethanolamine, diethanolamine and triethanolamine (TEA) chloride salts. Aluminosilicates and other clays are useful in the present invention. Some preferred clays are disclosed in US Pat. Nos. 4,605,509 and 4,274,975, which are incorporated herein by reference.

Other types of clays include zeolites, kaolinite, montmorillonite, attapulgite, illite, bentonite and halosite. Another preferred clay is kaolin.

[Pour-Molded Process

The transparent cleaning bar of the present invention is prepared by injection molding without alcohol. The present invention provides a composition comprising (A) 18 to 35 parts of a soap comprising at least 50% insoluble sodium soap; 14 to 32 parts water; 5 to 37 parts synthetic surfactant; And preparing a melt mixture of 18 to 37 parts of a water soluble organic solvent; And (B) moving the unit amount of the molten mixture to a bar forming mold and cooling the molded unit under a mild condition (no mixing or shearing) and cooling the transparent human cleansing bar.

Preferred alcohol-free processes include the following steps:

1. mixing a nearly insoluble fatty substance selected from the group consisting of triglycerides and fatty acids with a water-soluble organic substance selected from the group consisting of said polyols and mixtures thereof.

2. Adding the zwitterionic surfactant (s), water and weak salt (s), for example sodium chloride, with mixing.

3. Raising the temperature of the mixture of step 2 to 70-100 ° C. to provide a molten mixture.

4. Add sufficient caustic soda solution to saponify the fatty material and provide a low level of free caustic soda after saponification / neutralization to the mixture of step 3. In some cases cooling is done to prevent boiling, but the molten mixture is maintained.

5. Add some free fatty acid (at least sufficient to neutralize all free caustic soda), and optionally other synthetic surfactants to the mixture of step 4.

6. Adjust the mixing temperature up to 85 ° C.

7. Add other optional ingredients while mixing and maintain the temperature of 68-85 ° C.

8. Pouring the melt mixture into a bar mold or tube.

9. Conditioning the mixture in the bar mold or tube to promote crystallization / solidification.

Cool at product temperature below 68 ° C under ambient conditions. Preference is given to an average cooling rate of 0.1 to 7.0 ° C / min.

10. If using a tube, thinly cut the soap filling into bar-size fillings.

11. Molding the molded bar and packaging the molded bar.

A preferred process is the framed bar process. Other processes such as injection molding can also be used.

EXAMPLE

The following method is used to make the illustrated injection molded bars. This method includes the following steps:

1. A molten mixture batch is prepared in stages as described below.

2. Inject the molten mixed product into the bar mold or tube.

3. Cool the bar under ambient conditions that promote crystallization and solidification.

4. If injected into a tube, cut the soap filling into thin bar-sized fillings.

5. Press and pack the bar.

[Batch formula method]

1. Triglycerides (eg cured tallow) and / fatty acids (eg lauric acid) are mixed in a water soluble polyol (eg propylene glycol) and Crutcher.

2. Add zwitterionic surfactants (eg coco betaine), water and salts (eg sodium chloride) to the crusher.

3. Raise the batch temperature to 70 ° C to 100 ° C.

4. Add enough caustic soda solution (eg 30% sodium hydroxide) so that a small amount of free caustic soda remains after saponification / neutralization. If necessary, cool the batch to prevent boiling.

5. If necessary, add free fatty acids to the batch.

6. Add other synthetic surfactants (eg sodium laureth-3 sulfate) to the batch as needed.

7. Adjust the batch temperature up to 85 ° C.

8. Add other optional ingredients (eg, sugars, fragrances) to the batch and maintain the batch temperature at 68 ° C to 85 ° C.

The temperature in the process may change slightly. For example, the temperature may vary within the range of 5 ° C. It is important to ensure that the viscosity of the molten mixture is not too high (eg, the process is typically carried out at temperatures below 68 ° C.) and to avoid stirring while cooling the mixture.

The following examples illustrate the practice of the invention and do not limit the invention. Unless stated otherwise, all percentages, parts, and ratios are by weight. The free fatty acids used in the examples are used in the same proportions as fatty acid soaps. Unless stated otherwise, soaps are prepared in situ. The amount of soap is expressed in weight percent of bar as well as weight percent of total soap.

Examples 1,2 and 3 shown below are transparent human cleansing bars of the present invention.

These transparent human cleansing bars exhibit at least the lowest acceptable hardness and, in most cases, excellent hardness (eg, Examples 2 and 3). Hardness is measured using the conical penetrometer method disclosed in US Pat. No. 5,340,492, issued August 23, 1994 to Kacher et al., Incorporated herein by reference. Penetration values below 5 mm indicate very hard bars. Penetration values of 5 to 10 mm represent moderately rigid bars.

Penetration values of 10 to 12 mm represent the least acceptable slight softening.

Penetration values above 12 mm represent a very soft bar that is not acceptable.

In terms of hardness, a penetration value of 10 mm or less is most preferred.

Comparative Examples A, B, C, D and E are human washing bars that do not fall within the scope of the claims of the present invention. Comparative Examples B, C and E are not transparent bars. Comparative Examples A and D are unacceptably soft.

In Examples 1 to 3 and Comparative Examples A to E, “Other Guitar” consists of 1.5 parts of sodium chloride, 1 part of free fatty acid, 1 part of fragrance and 0.1 part of preservative. Polyols are blends of propylene glycol, dipropylene glycol, glycerin and sucrose. Synthetic surfactant is sodium lauryl ethoxy (3) sulphate.

TABLE 1

TABLE 2

Example 4

TABLE 3

This is very desirable of the present invention. The bar has excellent transparency and foaming properties. Soaps were made from a combination of triglycerides.

Example 5

TABLE 4

This is another highly desirable aspect of the present invention. The bar has excellent transparency, hardness, and foaming properties. The bar is also very mild.

Example 6

TABLE 5

The bar has excellent transparency, foaming properties and mild properties.

Example 7

TABLE 6

This is another preferred aspect of the present invention. As shown in “Total Amount”, the bar contains 57% of insoluble soap and 43% of soluble soap. The bar shows good transparency, has excellent purity and foaming properties and good bar structure. The bar was prepared using triglycerides as structure formers. The foaming synthetic surfactant system of the bar has an equilibrium surface tension of about 29 dynes / cm.

Example 8

TABLE 7

This is another preferred aspect of the present invention. The bar contains 39% soluble soap and 61% insoluble soap. The bars also exhibit excellent bar performance properties, in particular bar hardness. Note that the bar contains 8% glycerin.

Example 9

TABLE 8

This example has a higher amount of soap and a smaller amount of water.

The bar was made of a mixture of triglycerides (coconut oil) and fatty acids (tri-compressed stear fatty acids).

Example 10

TABLE 9

This example is an example of a bar having good bar performance properties but having a lower synthetic surfactant content.

Example 11

TABLE 10

This example is an example of manufacturing only fatty acid. This bar has excellent performance characteristics. The bar does not contain sugar.

Example 12

TABLE 11

This example is an example of only 25% soap, but has excellent transparency and good performance properties.

Claims (16)

(A) 18 to 35 parts sodium soap; (B) a critical micelle concentration equilibrium surface tension of 10 to 50 dynes / cm as measured at 25 ° C., containing an alkyl chain of C ₈ to C ₂₂ , acyl isethionate, acyl sacosinate, alkylglyceryl Ether sulfonates, methylacyl taurates, paraffin sulfonates, linear alkyl benzene sulfonates, N-acyl glutamate, alkyl sulfosuccinates, alpha sulfo fatty acid esters, alkyl ether carboxylates, alkyl phosphate esters, ethoxylated alkyl phosphate esters, 5 to 37 parts foam forming synthetic surfactant selected from the group consisting of alpha olefin sulfonates, alkyl ether sulfates having 1 to 12 ethoxy groups, and mixtures thereof; (C) 14 to 32 parts of water; And (D) 18-37 parts of a water-soluble organic solvent selected from the group consisting of a water-soluble organic polyol and a mixture of water-soluble organic polyols and urea, wherein at least 50% of the sodium soap has 16 to 24 carbon chain lengths of carbon atoms. An insoluble soap which is a monovalent salt of a saturated fatty monocarboxylic acid having a transparent injection molded human cleansing soap bar, wherein the amount of water and a water-soluble organic solvent in the bar is about 40 parts or more. The clear injection-molded inte cleaning soap bar of claim 1, wherein 50% to about 87% by weight of the sodium soap is an insoluble soap, and the amount of soap is 24 parts to 32 parts. The transparent injection molded human cleansing soap bar of claim 2, wherein the amount of the water-soluble organic solvent is 20 parts to 28 parts. 4. The transparent injection molded inte cleaning soap bar of claim 3, wherein the amount of water is between 18 and 27 parts of the bar. The transparent injection molded human cleansing soap bar of claim 4, wherein the ratio of water to water soluble organic solvent in the bar ranges from about 1.8: 1 to about 1: 2. The transparent injection molded human cleansing soap bar of claim 5, wherein the ratio of soap to water soluble organic solvent in the bar ranges from about 0.8: 1 to about 2: 1. The transparent injection molded human cleansing soap bar of claim 6, wherein the ratio of insoluble soap to soluble soap in the soap mixture ranges from about 1.2: 1 to about 2.4: 1. 8. The transparent injection molded human cleansing soap bar of claim 7, wherein the amount of the foamable synthetic surfactant is from 12 parts by weight to 22 parts by weight of the soap. The method of claim 8, wherein the water-soluble organic polyol is selected from the group consisting of propylene glycol, dipropylene glycol, butylene glycol, ethylene glycol, 1,7-heptane-diol, polyethylene glycol with a molecular weight up to 8,000, and polypropylene glycol, sorbitol, glycerol, di- And triethanolamine, non-reducing sugars, and mixtures thereof. The clean injection molded human cleansing soap bar of claim 9, wherein the insoluble soap is selected from the group consisting of sodium palmitate and sodium stearate and higher fatty acids and mixtures thereof. (A) 18 to 35 parts natrum soap; (B) a critical micelle concentration equilibrium surface tension of 10 to 50 dynes / cm as measured at 25 ° C., containing an alkyl chain of C ₈ to C ₂₂ , acyl isethionate, acyl sacosinate, alkylglyceryl Ether sulfonates, methylacyl taurates, paraffin sulfonates, linear alkyl benzene sulfonates, N-acyl glutamate, alkyl sulfosuccinates, alpha sulfo fatty acid esters, alkyl ether carboxylates, alkyl phosphate esters, ethoxylated alkyl phosphate esters, 5 to 37 parts foam forming synthetic surfactant selected from the group consisting of alpha olefin sulfonates, alkyl ether sulfates having 1 to 12 ethoxy groups, and mixtures thereof; (C) 18 to 37 parts of a water-soluble organic solvent which is a mixture of a water-soluble organic polyol and urea; And (D) 14 to 32 parts of water, wherein at least 50% of said sodium soap is an insoluble soap that is a monovalent salt of saturated fatty monocarboxylic acid having from 16 to 24 carbon atoms in carbon atoms, and about water soluble organic solvent. A transparent injection molded human cleansing soap bar having from 2 to about 7 parts urea and having a combined amount of water and a water-soluble organic solvent in the bar at least about 40 parts. The transparent injection molded human cleansing soap bar of claim 11, wherein 50% to about 87% by weight of the sodium soap is an insoluble soap and the amount of soap is 24 parts to 32 parts. The method of claim 12, wherein the water-soluble organic solvent is propylene glycol, dipropylene glycol, butylene glycol, ethylene glycol, 1,7-heptane-diol, polyethylene glycol and polypropylene glycol having a molecular weight of 8,000 or less, sorbitol, glycerol, di- And a polyol selected from the group consisting of triethanolamine, non-reducing sugars, and mixtures thereof. The transparent injection molded human cleansing soap bar of claim 13, wherein the ratio of water to water soluble organic solvent in the bar ranges from about 1.8: 1 to about 1: 2. The transparent injection molded human cleansing soap bar of claim 14, wherein the ratio of soap to water soluble organic solvent in the bar ranges from about 0.8: 1 to about 2: 1. The transparent injection molded human cleansing soap bar of claim 15, wherein the ratio of insoluble soap to soluble soap in the soap mixture ranges from about 1.2: 1 to about 2.4: 1.