JPH08269499A - Solid soap and production thereof - Google Patents

Abstract

PURPOSE: To remarkably reduce crazing in use by producing a solid soap based on a fatty acid soap in such a manner that it shows substantially no endothermic peak in a specified temperature range. CONSTITUTION: The specified temperature range is 40-65 deg.C. A soap composition consisting of 80-93wt.% fatty acid soap (A) which is formed from fatty acids comprising a mixture of 53-70wt.% fatty acid of less than 18C, 0-14wt.% 18C or higher saturated fatty acid and 16-45wt.% 18C or higher unsaturated fatty acid and 7-15wt.% water is kneaded and extruded in the form of a soap bar at a temperature of 46-58 deg.C, preferably 50-55 deg.C. To be concrete, the composition is kneaded at 30-45 deg.C for 1-30min by using a two-stage pelletizer, a triple roll mill, etc., and then extruded in the form of a soap bar through a vacuum two- stage prodder from a mouthpiece of 40mm in diameter. The bar can be formed into a solid soap of a desired shape by a usual method such as stamping, although not limited to this method.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solid soap which is widely used for bathing, washing the face, etc., and in which cracking during use is remarkably improved, and a method for producing the same.

[0002]

2. Description of the Related Art Up to now, various solid soaps have been marketed, and various improved soap compositions and manufacturing methods have been proposed. For example, Japanese Examined Patent Publication (Kokoku) No. 6-31429 discloses a cleaning composition in which a part of the soap is in a delta phase state. When this composition is used, the softening of the soap can be suppressed, but cracks occur when the soap is used. There is a problem of cracking. In addition, Japanese Patent Publication No. 6-50260 discloses a synthetic cosmetic solid soap having improved smear (stickiness).
Japanese Unexamined Patent Publication (Kokai) No. 6-57298 discloses a soap composition containing a palm oil fatty acid salt and a coconut oil fatty acid salt, but both of them have a problem that cracking occurs when soap is used. Cracking during the use of soap is considered to be the fatal drawback of soap, and it is used especially in places with poor drainage such as washbasins, and in low temperature and low humidity environments such as in winter. Then cracks are more likely to occur. Once cracked, not only was it unfavorable in appearance, but stains adhered to the cracked portion, resulting in unsanitary problems.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a solid soap in which cracking during use is remarkably improved. Another object of the present invention is to provide an efficient method for producing a bar soap in which cracking is remarkably improved.

[0004]

According to the present invention, neat soap is dried to obtain chips (soap composition) having a fatty acid soap and a water content within a specific range, and then kneaded under a specific temperature condition. It was made based on the finding that the above problems can be achieved by extruding a soap bar as a soap bar. That is, the present invention provides a solid soap based on fatty acid soap, which does not substantially show an endothermic peak in the range of 40 to 65 ° C. The present invention also provides that the fatty acid constituting the fatty acid soap has the composition of a) to c) below of 80 to 93% by weight and a water content of 7 to 15%.
There is provided a method for producing the above-mentioned solid soap, which comprises kneading a weight% of a soap composition and extruding it as a soap bar having a temperature of 46 to 58 ° C. a) 53-70% by weight of fatty acids having less than 18 carbon atoms, b) 0-14% by weight of saturated fatty acids having 18 or more carbon atoms,
And c) 16-45% by weight of unsaturated fatty acid having 18 or more carbon atoms.

In the present invention, the soap having substantially no endothermic peak in the temperature range of 40 to 65 ° C. is the result of thermal analysis of solid soap using a differential scanning calorimeter (hereinafter abbreviated as DSC). , Shows no endothermic peak in the temperature range of 40 to 65 ° C, or the endothermic peak calorific value (area) is
It means soap that is less than 0.1 cal / g. For example, the endothermic peak calorie of soap can be easily determined by the method described below. That is, a sample cell is prepared by placing 1.0 to 5.0 mg of solid soap in a solid aluminum cell (container), covering it with a lid and crimping it with a crimper. On the other hand, a standard cell is obtained by crimping an empty cell in the same manner or by crimping by adding an appropriate amount of alumina so that the heat capacity becomes equal to that of the sample. The sample cell and the standard cell are subjected to a temperature rise measurement of 10 ° C. per minute by DSC. The obtained thermal analysis pattern is analyzed and the calorific value of the phase transition peak in the range of 40 to 65 ° C is calculated.

The soap composition targeted by the present invention can be obtained by various methods by a conventional method. For example, neat soap is dried in a spray drying tower to obtain a soap composition having a water content of 7 to 15% by weight (hereinafter abbreviated as%), preferably 7 to 13%. Examples of the raw material fats and oils for producing the fatty acid soap which is the base of neat soap, the fatty acid thereof and the lower alkyl ester of the fatty acid include various ones used for ordinary toilet soaps. Examples thereof include various fats and oils such as beef tallow, hydrogenated beef tallow, coconut fat, palm oil, olive oil and the like, and one or a mixture of two or more kinds of the fatty acids.
In addition, methyl ester and ethyl ester of the fatty acid may also be used. Using these, a fatty acid soap is manufactured by a conventional method. Here, as the alkaline agent for converting the fatty acid into soap, hydroxides of alkali metals such as sodium hydroxide and potassium hydroxide are preferable.

The fatty acid soaps thus produced, for example, beef fatty acid sodium soap, coconut oil fatty acid sodium soap, castor oil hydrogenated fatty acid sodium soap, and other various animal and vegetable fatty acids conventionally known as soap substrates. The sodium soap or the like, or a mixture of two or more kinds thereof, or those obtained by adding a small amount of a modifier thereto is used as a base material of neat soap. In the present invention, a clarifying agent such as sucrose, glycerin, sorbitol, propylene glycol or other polyols can be added to the fatty acid soap base material. If necessary, titanium oxide,
Various additives such as chelating agents such as edetate, moisturizers, anti-inflammatory agents such as glycyrrhizic acid derivatives and allantoin, antioxidants such as BHT, vitamins, dyes, and fragrances can be added.

In the present invention, the water content in the neat soap thus prepared, for example, the neat soap at 85 to 95 ° C., is dried so that the fatty acids constituting the fatty acid soap are a) to
A soap composition having 80-93%, preferably 85-93% and a moisture content of 7-15%, preferably 7-13%, ie a soap chip, having the composition of c) is obtained. a) fatty acid having less than 18 carbon atoms 53 to 70%, preferably 55 to 64%, b) saturated fatty acid having 18 or more carbon atoms 0 to 14%, preferably 0 to 7%, and c) having 18 carbon atoms. The above unsaturated fatty acids 16-45%,
Preferably 30 to 45%. In the present invention, the above-mentioned various additives may be added to the soap chips having the composition of a) to c) and mixed with a mixer or the like without adding them to neat soap.
In the present invention, the soap composition thus prepared is kneaded and extruded as a soap bar having a temperature of 46 to 58 ° C, preferably 50 to 55 ° C. Specifically, using a two-stage pelletizer, three-roll mill, etc.,
The mixture is kneaded for 30 minutes and then extruded as a soap bar from a die having a diameter of 40 mm using a vacuum two-stage plotter or the like. This soap bar can be made into a solid soap having a desired shape by a usual method such as stamping. The solid soap of the present invention in which cracking is remarkably improved can be produced by a method other than the above unless substantially showing an endothermic peak in the range of 40 to 65 ° C. The soap is not limited to that produced by the above production method.

[0009]

According to the present invention, it is possible to provide a solid soap in which cracking during use is remarkably improved. Next, the present invention will be described in more detail with reference to Examples, but the present invention is not limited thereto. In addition, the figure of the compounding quantity in an Example is weight%.

[0010]

【Example】

Example 1 Titanium oxide and a fragrance were added to a soap chip composed of sodium fatty acid, free fatty acid (palmitic acid) and water, and mixed with a mixer. The ratio of each component in the mixture is
Fatty acid sodium 76-85%, free fatty acid 4%,
Water content 10-19%, titanium oxide 0.2% and fragrance 0.8
%. Table 1 shows the composition of fatty acids constituting fatty acid sodium, the amount thereof, and the amount of water. Then, the mixture was taken out of the mixer and fed to a vacuum two-stage plodder to 50
The mixture was kneaded in the range of ˜52 ° C. and extruded from a die having a diameter of 40 mm to obtain a soap bar. The cracking property and endothermic peak calorie of the obtained soap bar were evaluated by the following methods.

Crack test A cylindrical soap bar was cut into a length of about 10 cm (diameter 40
mm), hang it with a string and soak it in warm water at 30 ℃ for 1 hour.
After pulling up and drying for 2 hours, it is further immersed in warm water at 30 ° C. for 1 hour, and the degree of cracking that occurs 1 day after pulling up is visually determined according to the following criteria. Judgment criteria ◎ ・ ・ ・ No cracks are observed at all 〇 ・ ・ ・ Shallow cracks occur only in the cross section △ ・ ・ ・ Deep cracks occur in the cross section × ・ ・ ・ Deep cracks occur in both the cross section and the side surface Endotherm A sample cell was prepared by placing solid soap with a peak calorific value of 1.5 mg in a solid aluminum cell (container), covering it with a lid and crimping it with a crimper. On the other hand, an empty cell similarly crimped was used as a standard cell. The sample cell and the standard cell were subjected to a temperature rise measurement of 10 ° C./min by DSC, the obtained thermal analysis pattern was analyzed, and the calorific value of the phase transition peak in the range of 40 to 65 ° C. was calculated. Table 1 shows the obtained results.

[0012]

[Table 1] Table-1 Comparative Example 1 2 3 4 1 2 3 4 Moisture 10 10 10 10 10 10 16 19 Breakdown of saturated fatty acids C ₈ 1 1 1 1 1 1 1 1 C ₁₀ 1 1 1 1 1 1 1 1 C ₁₂ 21 20 21 27 16 16 21 21 C ₁₄ 7 11 7 6 7 7 7 7 C ₁₆ 29 26 29 24 29 29 29 29 C ₁₈ 5 0 10 0 15 15 0 10 10 C ₂₂ 0 5 0 0 10 0 15 0 0 Breakdown of unsaturated fatty acids C ₁₈ F ₁ 30 30 25 25 25 25 25 25 C ₁₈ F ₂ 6 6 6 6 6 6 6 6 6 DSC heat of transition (cal / g) 0 0 0.05 0.07 0.18 0.39 0.20 0.45 Crack test ◎ ◎ ◎ 〇 △ × △ × In the table, C ₁₈ F ₁ represents an unsaturated fatty acid having 18 carbon atoms and having 1 unsaturated bond in the molecule, and C ₁₈ F ₂ is unsaturated having 18 carbon atoms having 2 unsaturated bonds in the molecule. Represents a fatty acid.

Example 2 To a soap chip consisting of sodium fatty acid, free fatty acid (lauric acid) and water, titanium oxide and a fragrance were added,
Mix with a mixer. The ratio of each component in the mixture is as follows: fatty acid sodium balance, free fatty acid 7%, water content 13
%, Titanium oxide 0.1% and fragrance 0.8%. The fatty acid composition and the amount of the fatty acid sodium used are as follows. Breakdown of saturated fatty acids C ₈ 1%, C ₁₀ 1%, C ₁₂ 10%, C ₁₄ 5
%, C ₁₆ 29% and C ₁₈ 12% Breakdown of unsaturated fatty acids C ₁₆ F ₁ 5%, C ₁₈ F ₁ 35% and C ₁₈ F ₂ 2
% Then, the mixture was taken out from the mixer, and the kneading was performed by adjusting the cooling water temperature so that the temperature of the composition was 45 ° C. by using a roll type three roll mill, and further, using a vacuum two-stage plodder, the worm rotation speed was changed. A 30 rpm 1, 2 stage screen was extruded from a die having a diameter of 40 mm under the conditions of 40 mesh and Hachinosuro diameter of 6 mm to obtain a soap bar at 54 ° C.

Example 3 The same composition as in Example 2 was mixed in a mixer in the same manner as in Example 2, taken out of the mixer, and then using a vacuum two-stage plodder, a worm rotation speed of 30 rpm and a one-stage screen of 4
0 mesh, 2-stage screen is extruded from a die with a diameter of 40 mm under the conditions of 30 mesh, 1-stage and 2-stage Hachinos diameter of 8 mm, and 46 ° C.
Got a soap bar. Example 4 The same composition as in Example 2 was mixed in a mixer in the same manner as in Example 2, and a two-stage pelletizer was used, and the worm rotation speed was 35.
rpm 1, 2 screen 40mesh, Hachinosu 8
Kneading was performed under the condition of mm. Furthermore, using a vacuum two-stage plodder,
Warm rotation speed 30 rpm, 1 or 2 stage screen 20me
sh and Hachinos were extruded from a die having a diameter of 40 mm under the condition of 6 mm to obtain a soap bar at 51 ° C.

Example 5 The same composition as in Example 2 was mixed in a mixer in the same manner as in Example 2, and a vacuum two-stage plodder was used, and the worm rotation speed was 35.
rpm, 1-stage screen 60 mesh, 2-stage screen 8
0 mesh, 1-step Hachinos caliber 4mm, 2-step Hachinos caliber 3mm
Extruded from a die having a diameter of 40 mm under the above conditions to obtain a soap bar at 50 ° C. Comparative Example 5 The same composition as in Example 2 was mixed with a mixer in the same manner as in Example 2, and the mixture was kneaded by using a roll type three-roll mill while adjusting the cooling water temperature so that the temperature of the composition was 43 ° C. , Furthermore, using a vacuum two-stage plodder, the worm rotation speed is 25 rpm,
A one- or two-stage screen was extruded from a die having a diameter of 40 mm under the conditions of 40 mesh and a Hachinos diameter of 8 mm to obtain a soap bar at 45 ° C.

Comparative Example 6 The same composition as in Example 2 was mixed with a mixer in the same manner as in Example 2, a two-stage pelletizer was used, and a worm was used.
Kneading was carried out under the condition of Hachinos diameter 12 mm. Further, using a vacuum two-stage plodder, the worm rotation speed is 25 rpm, the one- and two-stage screen, 40 mesh, and the diameter of Hachinosu is 6 mm.
It was extruded through a 0 mm die to obtain a soap bar at 40 ° C. The cracking properties of the soap bars obtained in Examples 2 to 5 and Comparative Examples 2 and 3 were measured in the same manner as in Example 1. The results are summarized in Table-2.

[0017]

[Table 2] Table-2 Example Comparative Example 2 3 4 5 5 6 Soap temperature during manufacturing (℃) 54 46 51 50 45 40 DSC transition heat (cal / g) 0 0.04 0 0.03 0.27 0.40 Crack test ◎ ◎ ◎ 〇 △ ×

Front page continuation (72) Inventor Miyako Kumagai 1-3-7 Hongo, Sumida-ku, Tokyo Lion Co., Ltd. (72) Inventor Naoji Umezawa 1-3-3, Sumida-ku, Tokyo Lion Stock In the company

Claims (2)

[Claims] 1. A solid soap based on a fatty acid soap, which does not substantially show an endothermic peak in the range of 40 to 65 ° C. 2. The fatty acid constituting the fatty acid soap is a) below.
To 80% by weight of fatty acid soap having a composition of c) to 7% by weight and a soap composition having a water content of 7 to 15% by weight are kneaded and extruded as a soap bar at a temperature of 46 to 58 ° C. Item 2. A method for producing a solid soap according to item 1. a) 53-70% by weight of fatty acids having less than 18 carbon atoms, b) 0-14% by weight of saturated fatty acids having 18 or more carbon atoms,
And c) 16-45% by weight of unsaturated fatty acid having 18 or more carbon atoms.