A SOAP BAR

Abstract

The present invention relates to a soap bar comprising soap, at least one perfume oil, at least one polymer, optionally water, and optionally further known cosmetic ingredients other than the soap, the perfume oil, the polymer and the water, wherein the at least one polymer is a water-soluble polymer, wherein the polymer has a water solubility of at least 0.01 g of polymer in 100 g of water at 20 C. at one or more than one pH value in the range between (4) and (9), and wherein the at least one polymer is selected from the group consisting of a polymer in which more than 20 wt % of the repeating units of the polymer are repeating units derived from at least one ethylenically unsaturated, polymerizable monomer having at least one acid group, and a polymer comprising repeating units derived from N-vinylpyrrolidone, wherein the proportion of these repeating units in the polymer is at least 50 wt %.

Claims

1. A soap bar comprising soap, at least one perfume oil, at least one polymer, optionally water, and optionally further known cosmetic ingredients other than the soap, the perfume oil, the polymer and the water, wherein the at least one polymer is a water-soluble polymer having a water solubility of at least 0.01 g of polymer in 100 g of water at 20 C. at one or more than one pH value in the range between 4 and 9, and wherein the at least one polymer is selected from the group consisting of a polymer in which more than 20 w % of the repeating units of the polymer are repeating units derived from at least one ethylenically unsaturated, polymerizable monomer having at least one acid group, wherein these repeating units are present as free acids or as salts, wherein when they are present as salts the salts are preferably alkali metal salts, especially sodium salts, and a polymer comprising repeating units derived from N-vinylpyrrolidone, wherein the proportion of these repeating units in the polymer is at least 50 w %.

2. The soap bar according to claim 1 wherein the soap is selected from the group consisting of the sodium salt of a fatty acid or fatty acid mixture, wherein the fatty acid is a linear aliphatic monocarboxylic acid having 6 to 24, and wherein 0 to 10 w % of said sodium salt is a potassium salt, a syndet or mixture of syndets, and a mixture of one or more syndets and the sodium salt of a fatty acid or fatty acid mixture, wherein the fatty acid is a linear aliphatic monocarboxylic acid having 6 to 24, and wherein 0 to 10 w %, preferably 0 to 5 w % of said sodium salt is a potassium salt.

3. The soap bar according to claim 2 wherein the soap is a syndet or mixture of syndets, and wherein the syndets are selected from the group consisting of a sodium salt of an acylisethionate, a sodium salt of an acyl glutamate, a sodium salt of an alkyl sulfoacetate, a sodium salt of a fatty alcohol sulfate, and a sodium salt of a fatty alcohol sulfosuccinate.

4. The soap bar according to claim 1 wherein the at least one perfume oil is a scent selected from the group consisting of an essential oil of vegetable origin, an essential oil of animal origin, and a synthetic scent.

5. The soap bar according to claim 1 wherein the at least one polymer is selected from the group consisting of a polymer in which more than 20 w % of the repeating units of the polymer are repeating units derived from acrylic acid and/or from methacrylic acid, wherein these repeating units are present as free acids or as salts, and a polymer comprising repeating units derived from N-vinylpyrrolidone, wherein the proportion of these repeating units in the polymer is at least 50 w %, and wherein the polymer optionally further comprises repeating units derived from methacrylamide and/or vinyl acetate and/or vinylimidazole and/or quaternized vinylimidazole, wherein the quaternization is a N-methylation.

6. The soap bar according to claim 1 wherein the at least one polymer is selected from the group consisting of a polymer comprising repeating units derived from 21 to 60 w % of methacrylic acid, 40-60 w % of ethyl acrylate, 0-20 w % of acrylic acid, 0-0.25 w % of a bi-, tri- or tetrafunctional monomer, 0 to 20 w % methacrylamide, and 0-10 w % of a 012 to 022 alkyl (EO).sub.0-100-methacrylate, a polymer comprising repeating units derived from 40-60 w % of ethyl acrylate, 40-60 w % of methacrylic acid, and 0 to 1 w % of allylpentaerythritol; a polymer comprising repeating units derived from 45-50 w % of ethyl acrylate, 37-43 w % of methacrylic acid, 5-15 w % of methacrylamide, 0.1 to 5 w % of C.sub.18 alkyl (EO)25-methacrylate, and 0.01 to 1 w % of allylpentaerythritol; and a polymer comprising repeating units derived from 50-60 w % of ethyl acrylate, 30-40 w % of methacrylic acid, 5-15 w % of acrylic acid, and 0.01 to 1% of allylpentaerythritol.

7. The soap bar according to claim 1 wherein the at least one polymer is selected from the group consisting of (quantitative particulars in w %) a polymer comprising repeating units derived from ethyl acrylate (44-54%), methacrylic acid (35-45%), methacrylamide (9-11%), C.sub.18 Alkyl (EO)25-methacrylate (0.25-0.75%) and pentaerythrityl triallyl ether (0-0.1%), a polymer comprising repeating units derived from ethyl acrylate (44-54%), methacrylic acid (35-45%), acrylic acid (5-15%) and pentaerythrityl triallyl ether (0.5-0.25%), a polymer comprising repeating units derived from ethyl acrylate (40-60%) and methacrylic acid (40-60%), N-vinylpyrrolidone homopolymer, and a polymer comprising repeating units derived from methacrylic acid (45-55%), ethyl acrylate (40-45%), C.sub.18 alkyl (EO)25-methacrylate (5-10%), 022 alkyl (EO)20-40-methacrylate (5-10%).

8. The soap bar according to claim 1 wherein the soap bar comprises 60-99.9 w % of soap, 0.01 to 10 w % of the at least one perfume oil, 0.1-10 w % of the at least one polymer, 0 to 40 w % of water, and 0 to 10 w % of further known cosmetic ingredients other than the soap, the perfume oil, the polymer, and the water.

9. The soap bar according to claim 1 wherein the soap bar comprises 65 to 90 w % of soap, 0.1 to 5 w % of the at least one perfume oil, 0.2 to 5 w % of the at least one polymer, 10 to 25 w % of water, and 0 to 5 w % of further known cosmetic ingredients other than the soap, the perfume oil, the polymer, and the water.

10. The soap bar according to claim 1 wherein the soap bar comprises 70 to 89 w % of soap, 0.3 to 2 w % of the at least one perfume oil, 0.5 to 2 w % of the at least one polymer, 10 to 25 w % of water, and 0 to 5 w % of further known cosmetic ingredients other than the soap, the perfume oil, the polymer, and the water.

11. A method of manufacturing the soap bar according to claim 1, comprising providing the soap, optionally comprising water, adding the polymer to the soap in the form of a dispersion or solution in water, and adding the perfume oil, optionally further water and optionally the optionally present further known cosmetic ingredients before or after the step of adding the polymer.

Description

EXAMPLES

[0033] % ages are wt % except when otherwise stated.

Water Content of Soap Bars Obtained

[0034] The examples which follow comprise the production of soap bars on the basis of soap noodles. The soap noodles comprise 12 wt % of water. Soap 1: blank value/reference sample without added polymer utilizes 8 wt % water in addition to the soap noodles and perfume oil. That is, the water content of the soap bar is: (120.91+8) wt %, i.e., about 20 wt %. The other examples comprise adding polymers in the form of aqueous dispersions to the soap bars. In order that the water content of the soap bar be about 20 wt % in all cases, additional water is added alongside each polymer dispersion.

Production of Bar Soap

[0035] An extruder (Sela Weber-Seelander screw press 33799/8000) was heated to 45 C. before use. The production of about 6 to 8 pieces of bar soap required altogether an amount of 1 kg of soap mass. To this end, the soap noodles were first coarsely ground and then forced through the extruder (large hole plate 5 mm). The ground product and the remaining input materials were then used to prepare a premix (see individual batches). This premix was thoroughly commixed in a bucket. The premix was introduced into the preheated extruder and forced five times through a large hole plate. This was followed by five passes using a small hole plate ( 2 mm). This was followed by a revamp to a strand press. The mass was processed at 50 C. into a strand and pressed into shape in a manual press.

[0036] Alternatively, a twin-screw extruder (e.g., Coperion ZSK 18 MEGlab) may also be used to produce the bar soaps.

TABLE-US-00001 TABLE 1 Polymer numbers and monomer composition Polymer Monomer composition of polymer (wt %) Polymer A ethyl acrylate (44-54%), methacrylic acid (35-45%), methacrylamide (9-11%), C18 alkyl (EO)25-methacrylate (0.25-0.75%), pentaerythrityl triallyl ether (PETAE) 0-0.1% Polymer B ethyl acrylate (44-54%), methacrylic acid (35-45%), acrylic acid (5-15%), PETAE (0.5-0.25%) Polymer C ethyl acrylate (40-60%) and methacrylic acid (40-60%) Polymer D A homopolymer of vinylpyrrolidone Polymer E methacrylic acid 45-55%, ethyl acrylate 40-45%, C18 alkyl (EO)25-methacrylate 5-10%, C22 alkyl (EO)20-40-methacrylate 5-10%

[0037] Soap noodles: Cremer SAP BV 601 (from Cremer Oleo), INCI: Sodium Palmate, Sodium Kernelate, the soap noodles comprised 12 wt % of water.

[0038] Parfume oil: Cotton Touch DC10420 (from Symrise)

Soap 1: Blank Value/Reference Sample without Added Polymer

TABLE-US-00002 Soap noodles % 91.0 Water % 8.0 Perfume oil % 1.0
Soap 2 with Polymer A (0.5% Polymer Content) Add Mixture to Soap as 29.1% Dispersion

TABLE-US-00003 Soap noodles % 90.5 Water % 6.8 Polymer A % 1.7 Perfume oil % 1.0
Soap 3 with Polymer A (2.0% Polymer Content) Add Mixture to Soap as 29.1% Polymer Dispersion

TABLE-US-00004 Soap noodles % 89.0 Water % 3.1 Polymer A % 6.9 Perfume oil % 1.0
Soap 4 with Polymer B (0.5% Polymer Content) Add Mixture to Soap as 30.0% Polymer Dispersion

TABLE-US-00005 Soap noodles % 90.5 Water % 6.8 Polymer B % 1.7 Perfume oil % 1.0
Soap 5 with Polymer B (2.0% Polymer Content) Add Mixture to Soap as 30.0% Polymer Dispersion

TABLE-US-00006 Soap noodles % 89.0 Water % 3.3 Polymer B % 6.7 Perfume oil % 1.0
Soap 6 with Polymer C (0.5% Polymer Content) Add Mixture to Soap as 30.0% Polymer Dispersion

TABLE-US-00007 Soap noodles % 90.5 Water % 6.8 Polymer C % 1.7 Perfume oil % 1.0
Soap 7 with Polymer C (2.0% Polymer Content) Add Mixture to Soap as 30.0% Polymer Dispersion

TABLE-US-00008 Soap noodles % 89.0 Water % 3.3 Polymer C % 6.7 Perfume oil % 1.0
Soap 8 with Polymer D (0.5% Polymer Content) Add Mixture to Soap as 20.0% Polymer Solution in Water

TABLE-US-00009 Soap noodles % 90.5 Water % 6.0 Polymer D % 2.5 Perfume oil % 1.0
Soap 9 with Polymer D (2.0% Polymer Content) Add Mixture to Soap as 20.0% Polymer Solution in Water

TABLE-US-00010 Soap noodles % 89.0 Polymer D % 10.0 Perfume oil % 1.0
Soap 10 with Polymer E (0.5% Polymer Content) Add Mixture to Soap as 30.0% Polymer Dispersion in Water

TABLE-US-00011 Soap noodles % 90.5 Water % 6.8 Polymer E % 1.7 Perfume oil % 1.0
Soap 11 with Polymer E (2.0% Polymer Content) Add Mixture to Soap as 30.0% Polymer Dispersion in Water

TABLE-US-00012 Soap noodles % 89.0 Water % 3.3 Polymer E % 6.7 Perfume oil % 1.0
Description of Smell Tests The smell of the soap was in each case assessed relative to the blank value without polymer. The smell was described as + when the soap with polymer has a stronger smell than the soap without polymer (blank value). The smell was described as ++ when the soap with polymer had a much stronger smell than the soap without polymer (blank value). The odor was described as - when the soap with polymer had a worse smell than the soap without polymer (blank value).
Smell Directly after Soap Production

[0039] The assessment panel numbered four people. They assessed the smell of the soap one day after the soap had been produced. The tables contain the raw data of the panelists' assessment.

TABLE-US-00013 TABLE 2 Assessment of smell of soaps with polymers relative to blank value directly after soap production polymer concentration Polymer 0.50% 2.00% Polymer A 4x + 4x ++ Polymer B 4x + 4x ++ Polymer C 4x + 4x ++ Polymer D 1x ++, 2x +, 1x 2x ++, 1x +, 1x Polymer E 2x ++, 2x 1x ++, 1x +, 2x
Smell after Storage of Soaps at 21 C. (4 Weeks)

[0040] The assessment panel numbered five people. They assessed the smell of the soap four weeks after the soap had been produced. The tables contain the raw data of the panelists' assessment.

TABLE-US-00014 TABLE 3 Assessment of smell of soaps with polymers relative to blank value after 4 weeks' storage at 21 C. polymer concentration Polymer 0.50% 2.00% Polymer A 4x +, 1x 3x ++, 2x + Polymer B 5x + 4x ++, 1x + Polymer C 3x ++, 2x + 2x ++, 2x +, 1x Polymer D 4x +, 1x 3x ++, 2x + Polymer E 1x ++, 3x +, 1x 4x ++, 1x +
Smell after Storage of Soaps at 40 C. (4 Weeks)

[0041] The assessment panel numbered five people. They assessed the smell of the soap four weeks after the soap had been produced. The tables contain the raw data of the panelists' assessment.

TABLE-US-00015 TABLE 4 Assessment of smell of soaps with polymers relative to blank value after 4 weeks' storage at 40 C. polymer concentration Polymer 0.50% 2.00% Polymer A 5x+ 5x ++ Polymer B 5x+ 4x ++, 1x + Polymer C 2x ++,3x + 3x ++, 2x + Polymer D 2x ++, 3x + 2x ++, 3x + Polymer E 1x ++, 4x 4x ++, 1x +

Evaluation and Summary of Smell Tests

[0042] The assessments of the smell of the bar soaps by 4 or 5 people (see Tables 2 to 4) are clear in verifying that the inventive polymers do improve the smell of soaps. There were but few outliers in the assessment. The smell was unambiguously improved by the added polymers. This is true not only directly after soap production (see Table 2) but also after storage for a period of 4 weeks after storage at 21 C. (see Table 3) and after storage at 40 C. (see Table 4).

Evaluation and Summary of Soap Processability, Consistency and Appearance Improved by Means of the Inventive Polymers

[0043] The production of the bar soaps 1 to 11 demonstrates clearly that adding the polymers improves the processability and consistency by making the bar soap mass much more uniform and shapeable. Compared to Soap 1 without polymers the polymer-containing soaps were less crumbly, much more homogeneous and smoother resulting in an enhanced and optimized extruding and pressing behavior without gaining stickiness. The manufactured bar soap appearances increased evidently from a coarse, streaky surface (Soap 1) to sleek and glossy surfaces (Soaps 2 to 11). This persists for the storage period of 4 week at 21 C. and 40 C.