WO2005017087A1

WO2005017087A1 - Toilet soap composition

Info

Publication number: WO2005017087A1
Application number: PCT/KR2004/002063
Authority: WO
Inventors: Ki-An Hyeon; Peter Kim; Soon-Il Kim
Original assignee: Cj Corp.
Priority date: 2003-08-18
Filing date: 2004-08-18
Publication date: 2005-02-24
Also published as: JP2007502884A; KR20050019288A

Abstract

The present invention relates to a toilet soap comprising a bar soap base, humectants and surfactants, wherein the soap base includes distilled coco fatty acids or palm kernel fatty acids hardened by a hydrogenation process and free fatty acids; the humectants is oil and liquid emollient of polyhydric alcohol; and the surfactant is sodium cocoyl isethionate, disodium lauryl sulfosuccinate or mixtures thereof. The present invention provides a toilet soap composition of which the manufacturing productivity is prohibited from declining by increasing the bar hardness through the hydrogenation process and the free fatty acid addition process. Further an excellent lather generation and foaming stability of coconut oil or palm kernel oil, and the cleansing effect properties are maintained without bar cracking after drying when used. Therefore, this invention can provide the toilet soap composition of which the moisture continuous retainment is enhanced.

Description

Description TOILET SOAP COMPOSITION

Technical Field The present invention relates to a toilet soap composition comprising a toilet soap base, humectants and surfactants. More specifically, the invention relates to a toilet soap composition having excellent lather generation, foaming stability and cleansing effect of saponified component of distilled coco fatty acid or palm kernel fatty acid, while keeping the manufacturing productivity by increasing the bar hardness of the toilet soap througli a hydrogenation process and an selective fatty acid addition; and of which moisture retainment quality is enhanced without bar cracking by the addition of humectants and surfactants. Background Art Generally, a soap is produced by saponifying natural animal oils, vegetable oils such as tallow, palm oil, palm kernel oil or coconut oil, or its distilled fatty acid and fractional distillation fatty acid with sodium hydroxide or potassium hydroxide, etc.; adding and mixing fragrances and additives to the soap base in which the mixture ratio of the saponified component of tallow or palm oil and the saponified component of palm kernel oil or coconut oil is 60-90% : 10-40%; and then milling, extruding and stamping. As the ratio of the saponified component of palm kernel oil or coconut oil is increased, or as the soap composition contains higher proportion of lauric acid having 12 carbons, a bar soap lathers more easily while being softer to the skin. In Colgate-Palmolive Company's US Patent No. 4,767,560, the topped, distilled coconut oil was partially saponified to enhance lather generation, especially showing improved lathering properties in cold water. In addition, coconut oil or stearic acid was used as a superfat to give mildness to skin in hand cleansing. The low titer of a soap made from coconut oil causes difficulty in extrusion and stamping in producing soaps, resulting in the decline in the productivity. Thus, there was a problem that its hardness needed to be improved by lowering the moisture content of soap base or by using the stearic acid having high titer. To solve this problem, a long drying process of soap base and the utilization of a Roll Mill in order to increase the efficiency in mixing during production of the toilet soap were further required. When superfats are used in a soap, creamy lathering combined with high density is promoted, and smoothness and mildness to skin are increased. Also, when they are used selectively, the bar hardness is also increased. As a superfat, fats, oils and fatty acids such as a stearic acid can be used, as it had aheady been described in Soap and Detergents(P. 145-151) written by Thomssen and McCutcheon in 1949 and Soap Technology For The 1990's(P 217-218) written by Luis Spitz. In general toilet soap production, there was a problem that when a soap is produced by using only the soap base saponified by adding sodium hydroxide to palm kernel oil and coconut oil, the low hardness causes difficulty in manufacturing a soap bar which leads to inefficient productivity even if mechanical equipments and environments are improved or partially controlled during the production such as the vacuum state in extruding and the cooling condition in stamping. In addition, when a soap made by the above method was used repeatedly, the surface part of soap was often separated due to high solubility at low temperature, swelled and softened. The soap base saponified from saturated fatty acid having no double or triple bonds between carbons had almost no fatty acid having double bonds such as oleic acid or linolenic acid which provides flexibility in a soaps , thus the bar cracking could occurred during usage. Therefore, there had been a problem that the water solubility and the water retention capability had to be enhanced by replacing the counter ion (as an example, potassium ion, etc.) instead of sodium ion to protect over-evaporation in drying condition. Also, in production, the extruding vacuum control and the stamping condition had to be improved. Also, as a method to protect soap cracking, there was the method that adds polyhydric alcohols such as glycerin or oils such as triglycerides more than 3% to increase flexibility in soap , but the method had an adverse effect in that the lather properties was decreased and the soap was softened. Further, there was a problem that when the water content of soap base is approximately 13%, liquid additives could only be added to general soaps in range of less than 5%, including fragrance. Disclosure To solve the problems stated above, the object of the present invention is to provide a toilet soap composition wherein the moisturizing effect is increased without cracking of the soap, manufacturing productivity decline is avoided, while simultaneously m aintaining e xcellent 1 ather, foaming s tability and c leansing e ffect a s compared with the common soaps. The above and other object of the present invention and more can be all achieved by the invention described below. For achieving the above object, this invention provides a toilet soap composition comprising 75 to 92% by weight of the toilet soap base including a saponified component of distilled coco fatty acid or the palm kernel fatty acid that is hardened by a hydrogenation process and free fatty acids; 5 to 10%o by weight of humectants; and 1 to 20% by weight of mild surfactant. The said saponified component of distilled coco fatty acid or palm kernel fatty acid is comprised of 45 to 60% by weight of lauric acid, and less than 1 to 2% by weight of fatty acid having double bonds. Said free fatty acid can be selected from the group consisting of palm fatty acid, myristic acid, stearic acid and mixtures thereof. The said humectants can be oil and liquid emollient of polyhydric alcohol. The said surfactant can be selected from the group consisting of sodium cocoyl isethionate, disodium lauryl sulfosuccinate and mixtures thereof. The present invention will be discussed in detail below. The soap base c omposition of the present invention is characterized by h aving 75 to 92% by weight of coconut oil or palm kernel oil which is hardened by hydrogenation and saponification. The lauric acid of said distilled coco fatty acid and palm kernel fatty acid is contained in 45 to 60% by weight, and the fatty acids having double bonds such as oleic acid, linoleic acid and etc. are included less than 1 to 2% by weight. According to the present invention, a fatty acid hardened by hydrogenation to coconut oil and palm kernel oil i s used, wherein the fatty a cid having double bonds between carbons such as oleic acid, linoleic acid and etc. is converted to stearic acid of a single bond, in result, the titer of fatty acid is increased than when hydrogen is not added and the hardness is also increased. Even if carbon distribution of the fatty acid varies depending on the origin of coconut oil and palm kernel oil, the fatty acids having double bonds between carbons such as oleic acid, linoleic acid and etc. are converted to the stearic acids of a single bond in the range of 5 to 8% in coconut oil and 13 to 16% in palm kernel oil. i preparing the soap base, after neutralizing fatty acids, tallow or palm oil as superfat, or myristic acid or stearic acid as single fatty acid is used in the range of 5 to 15% by weight, to increase the bar hardness, promote creamy lathering combined with high density, and enhance the smoothness and mildness to the human skin. 5 to 10%) by weight of humectants and/or oils and liquid emollients of polyhydric a lcohols a nd 1 t o 20% b y w eight o f s odium c ocoyl i sethionate, d isodium lauryl sulfosuccinate and/or mixtures thereof as surfactants are mixed. Afterwards, the liquid additives are converted to a creaming phase for preparing the Conditioning Pre-

Mix. When comparing the productivity efficient of the process using the Conditioning Pre-Mix with that of direct addition in the same amount of humectants and/or oil and liquid emollients of polyhydric alcohols, the whole productivity efficient including extrusion and molding process is enhanced. Also, according to the present invention, sodium cocoyl isethionate or disodium lauryl sulfosuccinate is used as mild surfactants to lower irritation, and when mixed with fatty acid carboxylate soap such as sodium cocoate or sodium palm kernelate, the soap effectively eliminates oil pollution, and when mixed with liquid oil and polyhydric alcohol, it is easer to produce a uniform creaming phase. The humectants and oils and liquid emollients of polyhydric alcohol added as above in the range of 5 to 10% by weight, improve the skin feel in the point of strong deffating and tightening to be excellent in moisturizing and cleansing effect. As a result, a clear rinsing is possible. Best Mode The following Examples are given to illustrate the invention more specifically but are not considered to be limited by those specified below. Examples 1 to 8 and Comparative Examples 1 to 3 Soaps were manufactured with the compositions of the following table 1 , by using a conventional manufacturing process. Table 1

Number * is described in detail as follows. 1. Saponified component of hydrogenated palm kernel fatty acid or coco fatty acid 2. Saponified component of palm kernel fatty acid or coco fatty acid 3. Saponified component of palm fatty acid 4. Palm fatty acid 5. Myristic acid 6. Stearic acid 7. Oils and polyhydric alcohols (1:1)% 8. Disodium lauryl sulfosuccinate 9. Sodium cocoyl isethionate In manufacturing toilet soaps with the compositions of the table 1, the general optimal amount of fragrance, pigments and basic additives were added to Examples and Comparative Examples equally. Experimental Example 1 Comparative Experiment of Lather Generation The soap bars were prepared by a conventional manner from the above compositions of Examples and Comparative Examples. The foaming powers of the soap bars were compared by using Ross-Miles Foam Height Test. Distilled water was added to said soap bars to produce 0.25% solution(as anliydride soap). The solutions were maintained at 40 °C and collected into 250mL of volumetric flask. And then, the soap solution was dropped from 90cm height of a measuring cylinder maintained at 40 °C . Immediately after all the soap solution of 250mL volumetric flask was dropped, the foam height was measured to show the lather volume (mm). The above method was repeated 5 times for the same test composition and the average value of 3 experiments, excluding the maximum and the minimum values are shown in the following table 2. Table 2

As shown in the above table 2, although the soaps of Example 1 to 8 were manufactured by mixing a large volume of oils and polyhydric alcohols which generally inhibit foaming, to the saponified base of hardened coconut oil or palm kernel oil, the soap bars of this invention showed that the lather volume was superior to that of comparative Examples 1 to 3. Experimental Example 2 Comparative Experiment of Foaming Stability The soap bars were prepared by a conventional manner from the above compositions of Examples and Comparative Examples. The foaming stabilities of the soap bars were compared by using the Ross-Miles Foam Height Test. Distilled water was added to said soap bars to produce 0.25% solution (as anhydrous soap). The solutions were maintained at 40 ^°C and collected into 250mL of volumetric flask. And then, the soap solution was dropped from 90cm height of a measuring cylinder maintained at 40 ^°C . immediately after all the soap solution of 250mL volumetric flask was dropped, the foaming height was measured to show the initial volume(mm), and then after 3 minutes, the foaming height was measured to show the final volume(mm). The difference between the initial value and the final value was shown as a disappearing value. The above method was repeated 5 times for the same test composition, and the average value of 3 experiments, excluding the maximum and the minimum values are shown in following table 3. Table 3

As shown in the above table 3, although the soaps of Example 1 to 8 were manufactured by adding and mixing a large volume of oils and polyhydric alcohols to the saponified base of hydrogenated coconut oil or palm kernel oil, the soap bars of this invention showed low foam disappearance, representing that the foaming stability was superior to that of comparative Examples 1 to 3. Experimental Example 3 Comparative Experiment of Bar cracking The soap bars were prepared by a conventional manner from the above compositions of Examples and Comparative Examples. For comparing the bar cracking thereof, a pin was inserted in the top of the soap bars and it was fixed to a supporting rod. And then, it was completely dipped in tap water of 30 ^°C for 2 hours. After 2 hours, the swelling part was removed from the soaps and slightly washed with flowing cold water. The soap bar was dried at room temperature for one hour. After the same method was repeated 2 times, the soap bar was dried for 24 hours at thermostat of 30 ^°C. And then, the distance of the cracked gap on the soap surface was measured. 5 samples were tested, and then the average values of 3 samples, excluding the maximum and the minimum values are shown in following table 5 by the following table 4 valuation. Table 4

Table 5

As shown in the above table 5, the soaps of Example 1 to 8 were manufactured by mixing a large volume of oils and polyhydric alcohols to the saponified base of hardened coconut oil or palm kernel oil, to give a flexibility to the soap, as the result, the soap bars of this invention showed that the bar craking characteristic was improved to be almost non existent when compared with that of comparative Examples 1 to 3. Experimental Example 4 Cleansing effect experiment The soap bars were prepared by a conventional manner from the above compositions of Examples and Comparative Examples. By handing out questionnaire for the effective removal grease and dirt by these soap bars on 30 women between the ages of 20 to 35, the quality evaluation of the Simple Monadic Test was conducted to show the clenasing effect as 5 grade standard. Table 6

* 5 grade standard As shown in the above table 6, the soaps of Example 1 to 8 were manufactured by mixing a large volume of oils and polyhydric alcohols to the saponified base of hardened coconut oil or palm kernel oil, as the result, the soap bars of this invention showed that the cleansing effect was better than that of comparative Example 1 to 3 and the overall high scores of more than 4 points were obtained to show the possibility of a clear cleaning which meant cleanly removing the dirt and oil of hands and faces. Experimental Example 5 Skin moisturizing effect experiment The soap bars were prepared by a conventional manner from the above Compositions o f E xamples. F or m easuring t he moisture c ontent o f t he s kin, t he s kin was stabilized for more than at least 10 minutes in a room at constant temperature and humidity. The measuring area was marked on the forearm., the moisture content was measured by the Skin Surface Hygrometer (manufactured by YAYOI Co., Model No. Skincon-200) and the Corneometer (manufactured by CK Electronic GmbH, Model No. CM825). Afterwards, the soap bar was uniformly rubbed 20 times as wet state. Then, the area was rinsed for 20 seconds and dried. After 15 minutes in a room with constant temperature and constant humidity, the moisture content was measured. Each area was measured more than 5 times, the average value of 3 experiments. The moisture different content was calculated by measuring the moisture content before and after the portions were treated with the soap bar. Table 7

**; moisture content change

As shown in the above table 7, the soaps of Example 1 to 8 which is manufactured by mixing a large volume of oils and polyhydric alcohols to the saponified base of hydrogenated coconut oil or palm kernel oil, showed a rapid recovery of skin moisture after cleaning and the excellent skin care effect, when compared with the comparative Example 1 to 3. Industrial Applicability As described above, the toilet soap compositions according to the present invention are very useful inventions that maintain excellent lather generation, foaming stability and cleansing effect by using coconut oil or palm kernel oil; keep the productivity by increasing the hardness through the hydrogenation to the fatty acid and the selective free fatty acid addition; and give no cracking and enhance the continous retainment of moisturizing effect. Although the present invention was illustrated according to specific

Eexamples, various modifications and equivalents within the spirit and broad scope of this invention will be readily understood by one of ordinary skill in the art by reference.

Accordingly, the invention is intended to embrace all such modifications, equivalents and variations as fall within the spirit and broad scope of the appended claims.

Claims

What is claimed is: 1. A toilet soap composition comprising: 75 to 92% by weight of a soap base including a saponified component of distilled coco fatty acid or palm kernel fatty acid which are hardened by a hydrogenation process, and a free fatty acid; 5 to 10%) by weight of humectants; and 1 to 20% by weight of surfactant. 2. The toilet soap composition according to claim 1, wherein said saponified component of distilled coco fatty acid or palm kernel fatty consists of 45 to 60% by weight of lauric acid having 12 carbons, and less than 1 to 2% by weight of fatty acid having double bonds. 3. The toilet soap composition according to claim 1, wherein said free fatty acid is selected from the group consisting of palm fatty acid, myristic acid, stearic acid and mixtures thereof. 4. The toilet soap composition according to clam 1, wherein said humectants are oil and liquid emollient of polyhydric alcohols. 5. The toilet soap composition according to claim 1, wherein said surfactant is selected from the group consisting of sodium cocoyl isethionate, disodium lauryl sulfosuccinate and mixtures thereof.