CZ31797A3 - Transparent personal cleansing stick - Google Patents

Abstract

This invention relates to transparent pour molded personal cleansing bars which exhibit desirable hardness characteristics. These transparent bars are mild, low smearing and exhibit good lathering characteristics. The transparent bars of the present invention comprise: from 18 parts to 35 parts soap, wherein said soap comprises at least 50 % insoluble sodium soap; from 14 parts to 32 parts water; from 5 parts to 37 parts lathering synthetic surfactant; wherein said lathering synthetic surfactant has a critical micelle concentration equilibrium surface tension between 10 and 50 dynes/cm, as measured at 25 DEG C; and from 18 parts to 37 parts of a water soluble organic solvent.

Description

The invention relates to transparent and translucent casting molded personal cleansing bars. These sticks are fine, low-smelling and have good foaming properties. These bars also have desirable hardness properties.

BACKGROUND OF THE INVENTION

Transparent personal cleansing sticks are well known in the art and many customers require them. Unfortunately, there is a problem in developing their compositions that the bars are either too rough (e.g., if they contain high soap concentrations) or the bars may be too soft. For example, in U.S. Pat. No. 5,041,234 issued to Inston et al. August 20, 1991 discloses a transparent bar containing more than 40 parts soap (high soap bar).

Like other high soap bars, they exhibit the bars described by Inston et al. good foaming, low lubricity and good hardness. However, these bars with a high soap content are rough enough for the skin. Another disadvantage of these bars is that their manufacture generally requires the use of an undesirable solvent, e.g., short chain volatile monohydric alcohols, or requires special grinding for transparency.

Transparent bars containing lower concentrations of soap are also known in the art. Transparent bars with a lower soap content contain less than 40 parts soap. U.S. Pat. U.S. Patent 5,002,685 issued March 26, 1991 to Chambers and Inston discloses a transparent bar prepared with 25-34% soap, 5-15% monohydric alcohol, 15-30% sugar and / or cyclic polyol, and 15-30% water. Chambers et al. but contains 18 to 26% soluble soaps and 8 to 16% insoluble soap. Chambers et al. it is therefore mainly made of soluble soap. Unfortunately, personal cleansing bars containing less than 50% insoluble soap (e.g., more than 50% soluble soap) are unacceptably soft.

But Chambers warns against using high concentrations of insoluble soaps. In particular, chambers et al. disclose that the bars (Examples 37 and 38) containing between 30 and 20 wt. % of insoluble soaps and 10 wt. or less soluble soaps have poorer user properties due to low concentration of soluble soaps. (Column 8, rows 1 to 3). The preparation of this bar by Chambers et al. it also requires the use of an undesirable volatile monohydric alcohol solvent.

U.S. Pat. U.S. Patent 4,165,293 issued to Gordon on Aug. 21, 1979 also discloses personal cleansing sticks wherein the soap component is less than 50% insoluble soap. In particular, Gordon describes a non-monohydric alcohol method for preparing a transparent soap bar prepared primarily from tallow soap. It is stated herein that tallow soap typically contains 51 wt. soluble soap and can therefore be considered to be predominantly soluble soap. In addition, preferably the transparent soap bars described by Gordon consist of a mixture of 80-90% tallow soap and 10-20% coconut soap. The soap component of this transparent bar thus contains from 55% to 59% soluble soap.

U.S. Pat. U.S. Patent 5,264,144 issued to Moroney et al.

November 23, 1993; No. 5,340,492 issued to Kacher et al. August 23, 1994 disclose personal cleansing sticks consisting of fatty acid soap (including soluble and insoluble soaps), water, and synthetic surfactants (i.e.

anionic, amphoteric, and bars of Moroney et al. Kacher cleaning sticks nonionic). Personal cleaners are however not transparent and personal et al. are not always transparent.

Moreover, neither of these documents describes the preparation of a transparent cleaning stick.

It has now been discovered that personal cleansing bars containing 18 to 35 parts of soap, wherein the soap is at least 50% insoluble soap, are transparent and exhibit the desired hardness properties. These personal cleansing sticks are also gentle to the touch, low smear and exhibit good foaming properties. Furthermore, the preparation of these transparent bars does not require the use of monohydric alcohols.

SUMMARY OF THE INVENTION

The present invention relates to casting molded personal cleaning sticks having desirable hardness properties. These transparent sticks are fine, low-smear and have good foaming properties. The transparent bars of the present invention comprise: 18 to 35 parts of soap, the soap being at least 50% insoluble sodium soap; 14 to 32 parts water; 5 to 37 parts of a foaming synthetic surfactant; wherein the synthetic surfactant has an equilibrium surface tension at a critical micelle concentration of 10 to 50 dynes / cm at 25'C; and 18 to 37 parts water-soluble organic solvent, wherein the combined water and organic solvent contents are at least 40 parts.

DETAILED DESCRIPTION OF THE INVENTION

The present invention relates to casting molded personal cleaning sticks having desirable hardness properties. These transparent sticks are gently, low-smear and have good foaming properties.

The transparent bars of the invention comprise: (A) 18 to 35 parts of soap, the soap being at least 50% insoluble sodium soap; (B) 5 to 37 parts of a foaming synthetic surfactant; wherein the synthetic surfactant has an equilibrium surface tension at a critical micelle concentration of 10 to 50 dynes / cm at 25 ° C; (C) 14 to 32 parts water; and (D) 18 to 37 parts water-soluble organic solvent.

For the purposes of this invention, a bar is considered to be transparent if the four-point letter can be read through a bar of 0.635 cm thickness. The bar is not transparent if the 14-point letter cannot be read through a 0.635 cm thick bar. See Gordon, U.S. Pat. No. 4,165,293, issued Aug. 21, 1979, which is incorporated herein by reference.

As used herein, insoluble soap means 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. The transparent bars according to the invention are therefore very stable in terms of weight. The preparation of alcohol-free bars is also more economical. Some monohydric volatile alcohols (eg ethanol, propanol, butanol) may be used. However, the preferred bars of the present invention are substantially free of alcohol. Caution should be exercised when using monohydric alcohol based solvents because of their potentially explosive nature.

The concentrations, parts, percentages and ratios herein are by weight unless otherwise indicated. It will be appreciated that the soap compositions herein are referred to as wt% (wt%) soap. On the contrary, the parts are used here as parts by weight of the final rod. All numerical limits, ranges, ratios, etc. are approximate values unless otherwise indicated.

The individual components of the transparent personal cleansing sticks of the present invention and the desired methods of combining these components will be described in more detail as follows.

Soap: The transparent bars comprise about 18 to 35 parts, preferably about 20 to 32 parts, and even more preferably about 24 to 32 parts soap. Surprisingly, if the soap content is greater than about 35 parts, there is no transparent bar, and if the soap content is less than about 18 parts, the bar is unacceptably soft.

The soap composition of the present invention comprises at least 50% insoluble sodium soap, preferably 50 to about 87% insoluble sodium soap, even more preferably about 53 to 72% insoluble sodium soap. The transparent bar, if the soap component contains less than 50% insoluble soap, may be unacceptably soft.

The term insoluble soap is defined herein as follows: a fatty acid sodium soap which is less soluble than sodium myristate. In particular, the term insoluble soap refers to monovalent salts of saturated fatty monocarboxylic acids having a chain length of from 16 to 24 carbon atoms, preferably from 18 to 24 carbon atoms. These monovalent salts are normally sodium salts, although some other cations such as K, Mg or alkanolammonium ions may be used. The preferred insoluble fatty acid soap is selected from the group consisting of sodium palmitate, sodium stearate, and mixtures thereof. Other insoluble soaps may also be used, in particular insoluble soaps based on higher fatty acids.

The remainder of the soap composition is soluble soap. The term soluble soap refers to monovalent salts of saturated fatty monocarboxylic acids having a chain length of from 8 to 14 carbon atoms, and further to monovalent salts of oleic acid and unsaturated fatty monocarboxylic acids having a chain length of from 8 to 22 carbon atoms. We define sodium myristate as a soluble soap. Preferred soluble soaps are selected from the group consisting of myristic acid, oleic acid and lauric acid and mixtures thereof.

The fatty acid soap used in the transparent bars of the present invention may be prepared either on the basis of pure fatty acids, their mono-, di- or triglycerides or oils, or based on certain concentrations or concentration ratios of conventional fatty acids and oil mixtures such as e.g. coconut oil, palm oil stearin, tallow and triple pressed stearic acid.

The term coconut oil is meant herein (in connection with soap or fatty acid mixtures) materials having an approximate carbon chain length distribution: 8% _Q C, 7% _C10, 48% _C12, 17.5% _C14, 9% _C16 , 2% _C18 , 6% chain from oleic acid and 2.5% chain from linoleic acid. Coconut soap therefore contains approximately 11% insoluble soap and 89% soluble soap.

Babassu oil as used herein means (in conjunction with soap or fatty acid mixtures) substances with the following approximate carbon chain length: 6% C ₈ , 3% C ₁₀ , 46% C ₁₂ , 20% C ₁₄ , 7% 18% ^c i8 i chains from oleic acid. Babassu soap therefore contains approximately 7% insoluble soap and 93% soluble soap.

By means three fatty acids myristic acid _(C-4), stearic acid (C _18). therefore contains approximately soluble soaps.

Reinforced tallow fatty acids with chain stearic acid are here with chains of the following length: 5% 50% palmitic acid (C ₁₆ ) and 45% Three-pressed stearic acid 95% insoluble soap and 5% are substances derived from o following length: 3% myristic acid ( _C14 ), 50% palmitic acid ( _C16 ) and 45% stearic acid ( _C18 ) and 2% oleic acid. The solidified tallow therefore contains approximately 95% insoluble soap and 5% soluble soap.

For comparison, tallow is defined (normalized mean values from Table 6.34 of Baily's Industrial Oil and Pat Products, Vol. 1, Wiley Intersciences) as a mixture of soaps with the following approximate carbon chain length: 4% C ₁₄ , 29%

20% _C18 , 2% of the palmitoleic acid chain, 42% of the oleic acid chain, and 3% of the linoleic acid chain. Tallow soap therefore contains approximately 49% insoluble soap and 51% soluble soap.

The amount of free fatty acids in the resulting bars of the present invention is typically in the range of 0.5 parts to 3 parts, more typically 1 part to 2 parts. However, fatty acids are not required.

The free fatty acid component is preferably introduced into the soap compositions of the present invention by adding the fatty acid to the soap compositions after saponifying the soap composition. The free fatty acid component may also be introduced as a ready-to-use mixture of soap and free fatty acid, e.g., as an acid-reactive mixture of soap and free fatty acid prepared by incomplete neutralization in soap making.

The fatty acid soap of the present invention is sodium soap. However, low levels of non-sodium soaps, such as potassium, magnesium and / or triethanolammonium (TEA) are also acceptable. These non-sodium soaps, when used, are preferably used in concentrations of from 0 to 10 parts, more preferably from 0 to 5 parts (based on the weight of the soap bar).

Water: The water concentration in the rod is in the range of about 14 parts to about 32 parts, preferably from about 18 parts to about 27 parts, even more preferably from about 22 parts to about 26 parts. Higher water concentrations (within these ranges) are preferred for ease of processing, bar fineness, and other benefits.

A certain concentration of water in personal cleansing sticks is essential in order to obtain a transparent rod that exhibits the desired hardness properties. If the water concentration is less than about 14 parts (based on the weight of the bar), the bar may not be transparent. If the water concentration in the bar exceeds about 32 parts (based on the weight of the bar), the bar may be unacceptably soft.

Surfactant: The concentration of the foaming synthetic surfactant in the bar ranges from about 5 parts to about 37 parts, preferably from about 10 parts to about 28 parts, more preferably from about 12 parts to about 22 parts (based on the weight of the final bar). The addition of a synthetic surfactant is necessary to improve the properties of the bar. These properties include foaming / soaping properties, softness of the bar, rinsing sensation when using the bar, and properties related to stickiness and hardness of the bar.

The bar composition comprises a foaming synthetic surfactant selected from the group consisting of anionic surfactants, nonionic surfactants, zwitterionic surfactants, amphoteric surfactants, and mixtures thereof. A foaming surfactant is defined herein as a synthetic surfactant or surfactant mixture having an equilibrium surface tension between IG and 50 dynes / cm, more preferably between 20 and 45 dynes / cm, as measured at CMC (critical micelle concentration) at 25 ° C. Some surfactant mixtures have a lower surface tension than some of their components. Therefore, both low-foaming and high-foaming as well as high-soluble and low-soluble surfactants can be used in the bar compositions of the present invention. Particularly desirable are foam-enhancing synthetic detergent surfactants and / or synthetic detergent surfactants (which are known to be good dispersing agents for hard water soaps).

Preferred synthetic foaming surfactants include a mixture of anionic and zwitterionic / amphoteric surfactants. The addition of a zwitterionic / amphoteric surfactant will improve the fineness and foaming properties. However, the addition of this surfactant may also impair the structure of the rod and therefore the concentration of the amphoteric surfactant should not exceed 10 parts. Preferred zwitterionic / amphoteric surfactants include alkyl ampho mono and diacetates, alkyl betaines, alkyl sulfates, alkyl amidopropyl betaines, alkyl amidopropyl hydroxyssultaxins and mixtures thereof, said surfactants having alkyl chains of C ₈ to C ₂₂ length ^and mixtures thereof.

Examples of synthetic surfactants useful herein are described in U.S. Pat. No. 3,351,558 issued to Zimmerer on Nov. 7, 1967 (col.6, line 70 to col. line 74), which is incorporated herein by reference, in U.S. Patent 4,165,293 issued to Gordon on Aug. 21, 1979; No. 5,002,685 issued to Chambers and Inston on March 26

1991, U.S. Pat. No. 5,041,234, Aug. 20, 1991, these patents being incorporated herein by reference. They include the alkyls released here are sulfates,

Instonem et al. Incorporated as a whole anionic acyl sarcosinates, methyl acyl taurates, N-acyl glutamates and acyl isethionates, alkyl sulfosuccinates, alkyl phosphate esters, ethoxylated alkyl phosphates esters trideceth sulfates, protein condensates, mixtures of ethoxylated alkyl sulfates and alkyl amine oxides, betaine. Some of the preferred surfactants are alkyl ether sulfates with 1 to 12 ethoxy groups, especially lauryl ether ammonium and sodium sulfates.

Synthetic sulphate-based detergents which are of particular importance are the alkali metal salts of sulfuric acid esters and normal primary aliphatic alcohols having 10 to 22 carbon atoms. Sodium and potassium salts of alkyl sulfuric acids obtained from a mixture of higher alcohols from tallow reduction or from coconut oil, palm oil, palm kernel oil, palm oil stearin, babassu kernel oil and other coconut oil oils can be used herein.

Other aliphatic sulfuric acid esters may also be used.

Certain hygroscopic synthetic surfactants that are normally used in liquids and which are very difficult to incorporate into normal cleaning bars are very compatible in the synthetic surfactant bars, therefore, suitable for the present invention. All known to be suitable for cleaning products are the compositions of the present invention. The patent literature of synthetic selectively relating to cleaning products describes a number of tenids. Preferred synthetic surfactant systems are designed in terms of stick appearance, stability, foamability, cleaning performance and fineness.

A preferred foaming synthetic surfactant is selected from the group consisting of: acyl isethionates, acyl sarcosinates, alkylglyceryl ether sulfonates, methyl acyl taurates, paraffin sulfonates, linear alkylbenzene sulfonates, N-acyl glutamates, alkyl sulfosuccinates, alpha sulfo fatty acid esters, alkyl ether esters phosphates, ethoxylated alkyl phosphate esters, alpha olefin sulfonates, alkyl ether sulfates (having 1 to 12 ethoxy groups) and mixtures thereof, said surfactants having alkyl chains of 8 to 22 carbon atoms. Preferred are anionic surfactants, said surfactants having alkyl chains of 8 to 18 carbon atoms and wherein the counterion is selected from the group consisting of: Na, K, NH ₄ , N (CH ₂ CH ₂ OH) ₃ .

Some specific preferred surfactants are used in the examples. Examples of fine, foam-promoting synthetic detergent surfactants are, for example, sodium lauroyl sarcosinate, alkyl glyceryl ether sulfonate, sulfonated fatty esters, and sulfonated fatty acids.

It should be noted that the fineness of the surfactant can be measured by the skin barrier destruction test, which test is used to determine the irritation potential of the surfactant. In this test, the finer or milder the surfactant, the less the skin barrier is damaged. Skin barrier destruction is measured by the relative amount of radiolabelled water (3H-H ₂ O) that passes from the skin epidermis test solution to saline in the diffusate chamber. The test is described

T.J.Franz in the magazine

J. Invest. Dermatol., 1975, 64, p.

190-195 and in U.S

No. 4,673,525 issued to Smáll et al.

On June 16, 1987, the disclosures of which are incorporated herein by reference. These references describe a synbar based on a mild surfactant alkyl glyceryl ether sulfonate (AGS) containing a standard mixture with an alkyl glyceryl ether sulfonate and the criteria define a mild surfactant ”. Barrier destruction testing is used to select mild surfactants. Some preferred mild synthetic surfactants are described in said patent issued to Small et al.

Solvent: The transparent bars of the present invention comprise from about 18 parts to about 37 parts, preferably from about 20 parts to about 32 parts, even 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, a water-soluble organic polyol, and mixtures thereof. Urea may be used at a concentration of from 0 to 8 parts, preferably from 2 to 7 parts, or from 3 to 6 parts, but the total concentration of polyol and urea should preferably not exceed about 37 parts. Preferred water soluble organic polyols are selected from the group consisting of: propylene glycol, dipropylene glycol, butylene glycol, glycerine and ethylene glycol, 1,7-heptane-diol, mono and polyethylene and propylene glycols of up to 8,000 molecular weight, mono-C ₁ _ ₄ alkyl ethers, sorbitol, glycerol, mono-, di- and trithanolamine, 2-amino-1-butanol, non-reducing sugars such as sucrose, and mixtures thereof.

If used, the concentration of the preferred non-reducing sugar is from about 1 part to about 10 parts, preferably from about 2 parts to about 7 parts (based on the weight of the bar). Unless otherwise indicated, the term sucrose herein refers to sucrose, its derivatives, and similar non-reducing sugars and similar polyols that are substantially stable at a soap treatment temperature of up to about 99 ° C (21 ° F), such as trialose, raffinose, and stachyose. and sorbitol, lactitol and maltitol.

A water-soluble organic solvent is an essential component of the present invention and is required for the transparency of the rod. In addition, the concentration and type of water-soluble organic solvent used are very important to optimize the transparency of the personal cleansing bar.

Ingredient Combinations: In order to obtain a transparent bar, the personal cleansing bars of the present invention must contain certain combined concentrations of soap and water-soluble organic solvent. In particular, it is important that (in addition to the stated minimum solvent and water concentrations) a combined concentration of water-soluble organic solvent and water of 40 parts, preferably 45 parts (based on the weight of the bar) is maintained.

In order to obtain a transparent bar, it is also desirable that the water-soluble organic solvent, water and soap be mixed in certain proportions in the bar. The water and the water-soluble organic solvent are preferably (for the sake of transparency) mixed in a ratio of about 2: 1 to 1: 2, most preferably 1: 1. The soap and the water-soluble organic solvent are preferably mixed in a ratio of about 0.8: 1 to 2: 1, most preferably in a ratio of 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 from about 1.7: 1 to about 2.3: 1.

Additives: The soap composition of the bar of the present invention may include other ingredients commonly used in toilet bars, such as perfumes, other fillers, disinfectants and microbial agents, dyes, and the like.

Some preferred bars of the present invention comprise at least 1 part of another ingredient selected from the following group: humectants, colorants, fillers, polymeric feel and softness aids, perfumes, preservatives and mixtures thereof.

Compatible salts and their hydrates can be used as fillers. Preferred salts include sodium chloride, sodium sulfate, sodium hydrogen phosphate, sodium pyrophosphate, sodium tetraborate.

Useful compatible salts and their hydrates generally include the sodium, potassium, magnesium, calcium, aluminum, lithium and ammonium salts of inorganic acids and small carboxylic or other organic acids (having 6 or less carbon atoms), the corresponding hydrates, and mixtures thereof. Inorganic salts include chlorides, bromides, sulfates, metasilicates, orthophosphates, pyrophosphates, polyphosphates, metaborates, tetraborates and carbonates. Organic salts include acetates, formates, methyl sulfates and citrates.

Water-soluble amine salts may also be used. Monoethanolamine, diethanolamine and triethanolamine (TEA) chlorides are preferred.

Aluminosilicates and other clays are useful in the present invention. Some preferred clays are described in U.S. Pat. Nos. 4,605,509 and 4,274,975, which are incorporated herein by reference.

Other types of clays include zeolite, kaolinite, montmorillonite, attapulgite, ilite, bentonite and haloysit. Another preferred clay is kaolin.

Casting Process: The transparent personal cleansing bars of the present invention are prepared by alcohol-free casting. Casting consists of: (A) preparing a molten mixture of 18 to 35 parts soap (which is at least 50% insoluble sodium soap), 14 to 32 parts water, 5 to 37 parts synthetic surfactant, and 18 to 37 parts water soluble and (B) converting the unit amount of molten mixture into a rod form and cooling the formed unit at rest (without mixing or without shearing) to produce a fine, low-melting, transparent personal cleansing bar.

The preferred alcohol-free process consists of the following steps:

1. Mixing a predominantly insoluble fatty substance which comprises the group consisting of: tryglycerides and fatty acids and a water-soluble organic substance selected from the group consisting of the aforementioned polyols and mixtures thereof;

2. Addition of an amphoteric surfactant or surfactants, water and some salt or salts (eg sodium chloride) with stirring;

3. Increasing the temperature of the mixture from step 2 to 70-100 ° C to melt the mixture;

4. Add sufficient alkaline solution to the mixture of step 3 to saponify the fatty substance and remain in the mixture after saponification or saponification. neutralizing a low concentration of unreacted alkaline; cooling the mixture to avoid boiling but maintaining the mixture in the molten state;

5. Adding a small amount of fatty acid (at least enough to neutralize any free alkaline) and, optionally, adding another synthetic surfactant to the mixture of step 4;

6. Temperature of the mixture to max. 85 ° C;

7. Adding additional (optional) ingredients while stirring, maintaining the temperature at 68-85 ° C;

8. Pouring the molten mixture into rod molds or tubes

9. Adjusting the conditions of the mixture in molds so as to easily crystallize or solidify the mixture. Cooling must occur under rest conditions at a product temperature of less than 68 ° G. Average cooling rates of from 0.1 to 7.0 ° C per minute are preferred;

10. When using tubes, the soap pins are cut into rod-sized pins;

11. Punching the sticks and providing the finished sticks with packaging.

A tapped rod method is preferred. Other methods such as injection molding may be used.

Examples

The following method can be used as an example of the preparation of cast bars. The method consists of the following steps:

1. Preparation of the molten mixture by the following steps.

2. Pouring the molten mixture into rod molds or tubes

3. Cooling of the bars in crystallization occurred 4. When using pipes i of rod size; 5. Punching and opaque · rest conditions or solidification of the mixture. the soap pins are cut friction of the rods by the cover. Make it easy into the pins Discontinuous process 1. Mixing triglycerides (eg hardened tallow) and / or

fatty acids (eg lauric acid) with a water-soluble polyol (eg propylene glycol) in a mixer.

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

3. Increase the batch temperature to 70-100C.

4. Add sufficient alkaline solution (eg 30% sodium hydroxide) to the mixture to remain in the mixture after saponification or saponification. neutralization low concentration of unreacted alkaline substance. Cool the mixture if necessary to avoid boiling.

5. Add free fatty acid to the mixture, if necessary.

6. Add, if necessary, an additional systemic surfactant (eg, sodium laureth-3 sulfate) to the mixture.

7. Temperature of mixture to max.85´C.

8. Add other (optional) ingredients (eg sugar, perfumes), maintaining the temperature at 68-85 ° C.

The temperature of the process may fluctuate somewhat, for example it may fluctuate within the range of 5'C. It is essential that the viscosity of the molten mixture does not increase too much (which is typical for temperatures below 68 ° C) and that there is no agitation during cooling of the mixture.

The following examples illustrate the practice of the invention and are not limiting. All percentages, parts and ratios are by weight unless otherwise indicated. The free fatty acids used in the examples are used in the same proportions as the fatty acid soaps. The soaps are prepared in situ unless otherwise stated. Soap concentrations are given as weight percent (% by weight) of complete soap and also as weight percent (parts by weight) of the bar.

Examples 1, 2 and 3 below relate to transparent cleaning bars of the present invention. These transparent personal cleansing sticks exhibit at least a limiting acceptable hardness and usually (e.g. in Examples 2 and 3) good hardness. Hardness is measured by a tapered penetrometer as described by Kacher et al. in U.S. Pat. No. 5,340,492, issued Aug. 23, 1994, which is incorporated herein by reference. A penetration value of 10 to 12 mm indicates a soft stick, which is only marginally acceptable. A penetration value greater than 12 mm indicates a very soft stick that is unacceptable. A penetration value of 10 mm or less indicates the best bar in terms of hardness.

Comparative Examples A, B, C, D and E relate to personal cleansing bars that do not fall within the scope of the present invention. Examples B, C and E do not concern transparent bars. The bars of Comparative Examples A and D are unacceptably soft.

In Examples 1-3 and Comparative Examples A to E, the other ingredients consist of 1.5 parts sodium chloride, 1 part free fatty acid, 1 part perfume and 0.1 part preservative. The polyol is a mixture of propylene glycol, dipropylene glycol, glycerin and sucrose. The synthetic surfactant is sodium laurylethoxy (3) sulfate.

Example Cf. AND Example 1 Example 2 Cf. (B) Soap (parts) 15 Dec 18 32 40 Water (parts) 32 32 32 3 2 Polyol (parts) 20 May 20 May 23 20 May Synthetic surfactant (parts) 29.4 26.4 9.4 5.4 Other components 3.6 3.6 3.6 3.6 Soap / polyol ratio 0.83 1.0 1.52 2.2 Transparency Yes Yes Yes No Hardness very rather rather very

soft soft hard hard

Example Cf. C Cf. D Cf. E Example 3 Soaps (parts) 18 18 35 35 Water (parts) 15 Dec 35 32 32 Polyol (parts) 20 May 20 May 23 20 May Synthetic surfactant (parts) 39.4 11.4 12.4 7.4 Other components 3.6 3.6 3.6 3.6 Water and polyol content 37.5 65 47 52 Water / polyol ratio 0.67 1.17 2.13 1.6 Transparency No Yes No Yes Hardness rather very rather rather soft soft hard hard

Example 4

In a bar

Component Weight parts Rozp. Nerozp. Barbasú soap 10.5 9.8 0.7 Reinforced tallow soap 19.5 0.9 18.6 Three-pressed fatty acid 0.5 Propyleng1yko 1 11.0 Dipropylenglýko1 5.5 Glycerine 6.0 Sodium laurylethoxy (3) sulphate 12.0 Sodium laurylsufate 3.0 Koko betain 2,0 NaCl 1.5 Sugar 2,0 Water 24.3 Other 2.2

Total

100, o

10.7 19.3 (35.7%) (64.3%)

This example represents a highly preferred bar according to the present invention. The soap is prepared from a combination of triglycerides.

Example 5

Component

In a bar

Mass Parts Nerozp.

Coconut soap

Reinforced tallow soap

Three-pressed fatty acid Propylene glycol D i propylene glycol Glycerin

Sodium lauryl ethoxy (3) Sodium sulphate Alkylglyceryl ether sulphonate Lauroyl sulphosuccinate disodium Lauryl sodium sarcosinate Koko betaine

Cocoamidopropyl hydroxysulatin

NaCl

Sugar

Water

Sodium citrate

Other

7.8

18.2

1.0

12.0 6.0 6.0

10.0

2,0

1.0

2,0

3.0

2,0

1.5

2.5

22.8

0.5

1.7

6.9

0.9

0.9

17.3

Total

100.0

7.8 (30%)

18.2 (70%)

This example represents another highly preferred bar of the present invention. The bar exhibits excellent transparency, hardness and foaming. The stick is also very clear.

Example 6

Component Mass parts Rozp. Nerozp. Barbasú soap 11.2 10.5 0.7 Reinforced tallow soap 20.8 1.0 19.8 Three-pressed fatty acid 0.5 Pr opy leng bast1 13.0 Di propyl englyko1 6.5 Glycerine 6.0 Sodium laurylethoxy (3) sulphate 9.0 Koko betain 2,0 NaCl 1.5 Sugar 2,0 Sodium citrate 1.0 Water 24.3 Other 2.2 Total 100.0 11.5 20.5 (35.9%) (04.1%)

This bar exhibits excellent transparency, foaming and is very fine.

Example 7

In a bar

Component Weight parts Rozp, Nerozp Coconut soap 12.60 11.21 1.39 Reinforced tallow soap 15.40 0.77 14.63 Three-pressed fatty acid 2.00 Propylene glycol 16.81 Glycerine 3.19 Sodium laurylethoxy (3) sulphate 12.00 Koko betain 2.00 NaCl 1.50 k ₂ Sat ₄ 1.00

Sugar 4.50 Water 26.96 Perfume 1.80 Preservatives 0.21 Different 0.03 Total 100.00

(57%) (57%)

This example represents another preferred rod of the present invention. As the Total line shows, this bar contains 57% insoluble soap and 43% soluble soap. This bar exhibits good transparency, excellent foaming, is very fine and has a good texture. The constituent of the structure is triglycerides. The foaming system of this synthetic surfactant bar exhibits an equilibrium surface tension of about 29 dynes / cm.

Example 8

Component

In Rod Weight Parts

Nerozp.

Coconut soap

Reinforced tallow soap

Three-pressed fatty acid

Propyl eng 1 yko 1

Glycerine

Sodium lauryl ethoxylate (3) Sodium lauryl sulphate Koko betaine NaCl k ₂ so ₄

Sugar

Water

Perfume

Preservatives

Different

Total

11.20 16.80

2.00

11.97

8.00 9.00 3.00 2.00

1.50 1,00

4.50 26,96

1.80 0.21 0.03

100.00

9.97

0.84

1.23 15.96

10.81 (39%)

17.19 (61%)

This is another preferred bar according to the invention. It contains 39% soluble soap and 61% insoluble soap. This bar also exhibits excellent properties, in particular hardness. Note that it contains 8% glycerin.

Example 9

In a bar

Component Weight parts Rozp. Nerozp. Coconut soap 15.53 13.82 1.71 Three-pressed soap 16.99 0.85 16.14 Propylene glycol 25.24 Glycerine 2.09 Sodium laurylethoxy (3) sulphate 11.65 Koko betain 0.97 NaCl 1.08 TEA 4.85 Sugar 4.85 Water 16.00 Perfume 0.97 Preservatives 0.21 Different 0.03 Total 100.00 14.67 17.85 (45%) (55%)

This example contains a higher concentration of soap and less water. The bar is prepared from a mixture of triglycerides (coconut oil) and fatty acids (three-pressed stearic fatty acid).

Example 10

In a bar

Component Weight parts Rozp. Nerozp. Coconut soap 13.44 11.96 1.48 Reinforced tallow soap 14.56 0.73 13.83 Propylene glycol 20,00

Glycerine

Sodium laurylethoxy (3) sulphate

Koko betain

NaCl

K ₂ SO ₄

Sugar

Water

Perfume

Preservatives

Different

Total

3.21 8.00 1.00 1.50 1.00 7.25

27.8 1.00 0.21 0.03

100.00 12.69 15.31 (45%) (55%)

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

Example 11

In a bar

Component

Weight parts

Rozp. Nerozp.

Laur soap

Three-pressed soap Propylene glycol

Sodium laurylethoxy (3) sulphate

Koko betain

TEA

NaCl

Urea

Water

Perfume

Preservatives

Different

11 , 00 11 , 00 0.00 16 , 50 0 , 82 15.68 22nd , 00 10 , 00 2 , 00 5 , 00 1 , 00 5 , 00

26.2

1.00

0.21

0.06

Total

100.00 11.82 15.68 (43%) (57%)

This is an example of a bar prepared only from fatty acids. The bar has excellent properties. The bar does not contain sugar.

Example 12

In a bar

Component Weight parts Rozp. Nerozp. Coconut soap 10.00 9.00 1.00 Three-pressed soap 15.00 0.75 14.25 Three-pressed fatty acid 1.00 Propylene glycol 20,00 Glycerine 5.00 Sodium laurylethoxy (3) sulphate 10.00 Koko betain 1.00 NaCl 1.00 Na ₂ SO ₄ 2.00 TEA 2.00 Sugar 5.00 Water 26.76 Perfume 1, oo Preservatives 0.21 Different 0.03 Total 100.00 9.75 15.25 (39%) (61%)

This example of a bar prepared with only 25% soap, however, the bar shows excellent transparency and good properties.

Claims (10)

PATENTOVÉ A transparent cast personal composition comprising t (A) 18 to 35 parts of sodium soap, wherein at least 50% of the sodium soap is insoluble soap; (B) 5 to 37 parts foaming synthetic surfactant having an equilibrium surface tension at a critical micelle concentration of 10 to 50 dynes / cm at 25 ° C; (G) 14 to 32 parts water; and (D) 18 to 37 parts water-soluble organic solvent, wherein the combined water and organic solvent content of the rod is at least 40 parts. Transparent according to claim 1, a water-soluble cast personal cleansing soap bar according to claim 1, characterized in that the organic solvent is selected from the group consisting of water-soluble organic polyols and mixtures of water-soluble organic polyols and urea. A transparent cast personal cleansing soap bar according to claim 3, wherein the foaming synthetic surfactant is selected from the group consisting of: acyl isethionates, acyl sarcosinates, alkylglyceryl ether sulfonates, methylacyltaurates, paraffin sulfonates, linear alkylbenzene sulfonates, N- acyl glutamates, alkyl sulfosuccinates, alpha sulfo fatty acid esters, alkyl ether carboxylates, alkyl phosphate esters, ethoxylated alkyl phosphate esters, alpha olefin sulfonates, alkyl ether sulfates (having 1 to 12 ethoxy groups) and mixtures thereof, said surfactants having alkyl chains C 8-C uhlíku a and mixtures thereof. The transparent cast personal cleansing soap bar of claim 4, wherein the insoluble soap is selected from the group consisting of sodium palmitate and sodium stearate and higher fatty acids, and mixtures thereof. 5. A transparent cast personal cleansing soap bar comprising: (A) 18 to 35 parts of sodium soap, wherein at least 50% of the sodium soap is insoluble soap; (B) 5 to 37 parts of a foaming synthetic surfactant having an equilibrium surface tension at a critical concentration of 10 to 50 dynes / cm at 25 ° C; (C) 18 to 37 parts water-soluble organic solvent, wherein 2 to 7 parts water-soluble organic solvent is urea; and (D) 14 to 32 parts water, wherein the combined water and water-soluble organic solvent content of the rod is at least 40 parts. 6. A transparent cast personal cleansing soap bar according to claim 2 or 5 wherein 50 to 87% by weight of sodium soap is insoluble soap, wherein the soap content is between 24 and 32 parts. A transparent cast personal cleansing soap bar according to claim 6, wherein the water-soluble organic solvent is a polyol selected from the group consisting of: propylene glycol, dipropylene glycol, butylene glycol, glycerin and ethylene glycol, 1,7-heptanediol, polyethylene and polyethylene. propylene glycols up to a molecular weight of 8000, their mono C _1-4 alkyl ethers, sorbitol, glycerol, mono-, di- and trithanolamine, 2-amino-1-butanol, non-reducing sugars and mixtures thereof. A transparent cast personal cleansing soap bar according to claim 7, wherein the ratio of water to water-soluble organic solvent in the bar is 2: 1 to 1: 2. 9. A transparent cast personal cleansing soap bar according to claim 8 wherein the ratio of soap to water-soluble organic solvent in the bar is 0.8: 1 to 2: 1. The transparent cast personal cleansing soap bar of claim 9, wherein the ratio of insoluble soap to soluble soap in the soap composition is 1.2: 1 to 2.4: 1. 11. A transparent cast personal cleansing soap bar according to claim 10, wherein the bar is alcohol free.