JP2003129092A - Transparent solid soap composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a composition suitable for transparent solid soap in which formation of powder-coated surface of the soap is suppressed when it is stored at a low temperature, and suitability for shaping the soap can be improved. SOLUTION: This transparent solid soap composition contains a saturated fatty acid soap, maltitol and a polypropylene glycol. Preferably, the content of maltitol is 2 to 10 wt.%, that of the polypropylene glycol is 0.5 to 10 wt.%, that of the saturated fatty acid soap is 25 to 45 wt.%, and the saturated fatty acid soap is a mixture of a 14-18C straight chain saturated fatty acid with a 14-18C branched chain saturated fatty acid.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel composition of a transparent solid soap, and more specifically, it suppresses dusting of the surface of the solid soap when stored at low temperature, and has good moldability. It relates to a novel composition of improved transparent solid soap.

[0002]

2. Description of the Related Art Conventionally, transparent soaps are used as solid soaps.
As a high-quality product, it has come to be marketed as face wash soap, medicated soap and the like. The transparent solid soap has a saturated fatty acid soap as a main component, but the aged solid soap is too hard, and therefore, there is a problem that crevices occur when it is shaped by a mold. In addition, after shaping, the solid soap is kept at a low temperature (about -5
When stored at about 15 ° C.), there is also a problem that dusting occurs due to crystal precipitation of saturated fatty acid soap or the like on the surface of the solid soap.

[0003]

SUMMARY OF THE INVENTION The present invention is intended to solve the above problems, and an object thereof is to suppress the dusting of the surface of the solid soap when stored at low temperature,
It is an object of the present invention to provide a composition suitable for a transparent solid soap capable of improving the moldability.

[0004]

[Means for Solving the Problems] As a result of diligent studies on the above problems, as a result of blending maltitol and polypropylene glycol with saturated fatty acid soap, the solid soap surface generated dust when stored at low temperature. To be suppressed,
In addition, they found that the moldability was improved, and completed the invention.

That is, the present invention is as follows. (1) A transparent solid soap composition comprising a saturated fatty acid soap, maltitol and polypropylene glycol. (2) The content of maltitol is 2 to 10% by weight,
The transparent solid soap composition according to (1) above. (3) The content of polypropylene glycol is 0.5 to 1
The transparent solid soap composition according to (1) above, which is 0% by weight. (4) The transparent solid soap composition according to (1) above, wherein the saturated fatty acid soap is a mixed fatty acid soap of a linear saturated fatty acid having 14 to 18 carbon atoms and a branched saturated fatty acid having 14 to 18 carbon atoms. (5) The transparent solid soap composition according to (1) above, wherein the saturated fatty acid soap is a mixed salt of saturated fatty acids containing sodium and potassium. (6) The sodium / potassium ratio is 95/5 by molar ratio.
The transparent solid soap composition according to (5) above, which is 55/45. (7) The transparent solid soap composition according to (1) above, wherein the saturated fatty acid soap content is 25 to 45% by weight.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The transparent solid soap composition of the present invention comprises
Contains saturated fatty acid soaps, maltitol and polypropylene glycol.

In the saturated fatty acid soap used in the present invention, the saturated fatty acid is a linear or branched saturated fatty acid having preferably 14 to 18 carbon atoms. When the carbon number is 13 or less, the skin irritation of the transparent solid soap becomes large, and conversely, when the carbon number is 19 or more, the transparency of the solid soap becomes poor, which is not preferable.

Specific examples of the saturated fatty acid having 14 to 18 carbon atoms include linear saturated fatty acids such as myristic acid, palmitic acid and stearic acid; and branched saturated fatty acids such as isostearic acid, isopalmitic acid and isomyristic acid. Can be mentioned. These may be used alone or in combination of two or more, but from the viewpoint of transparency, it is preferable to use the above linear saturated fatty acid and the above branched saturated fatty acid in a mixture. In this case, the linear saturated fatty acid / branched saturated fatty acid ratio is
70/30 to 95/5 (weight ratio) is preferable.

The saturated fatty acid soap includes saturated fatty acid
Examples thereof include sodium salt, potassium salt, and ethanolamine salt, and these may be used alone or in combination of two or more. Among these, sodium salts and potassium salts are preferable in that the skin irritation of the transparent solid soap is low, and particularly,
It is preferably a mixed salt containing sodium salt and potassium salt. In this case, the sodium / potassium ratio is 95/5 to 55/45, especially 90/10 to 60, in molar ratio.
It is preferably / 40. The molar ratio of sodium is 9
More than 5% (molar ratio of potassium is less than 5%)
And, the transparency and foaming property at low temperature of the solid soap are inferior, and conversely, when the molar ratio of sodium is less than 55% (the molar ratio of potassium exceeds 45%), the soap composition is solidified. It is not preferable because it is inferior in properties.

In the present invention, the content of the saturated fatty acid soap in the composition is preferably 25 to 45% by weight, more preferably 38 to 43% by weight. If the content is less than 25% by weight, the solidification property of the soap composition is poor, and conversely, if it exceeds 45% by weight, the transparency of the solid soap is poor, which is not preferable.

The transparent solid soap composition of the present invention contains maltitol and polypropylene glycol together with the saturated fatty acid soap. As a result, the crystallinity of the saturated fatty acid soap in the composition is lowered, and therefore, the powdering of the solid soap surface due to the precipitation of crystals of the saturated fatty acid soap during storage at low temperature can be suppressed. Further, the hardness of the solid soap is moderately reduced by the plasticizing action of maltitol and polypropylene glycol, and therefore, even if the mold is shaped by a mold, no cracks will occur. Such an effect is exhibited by blending both maltitol and polypropylene glycol, and is not exhibited by blending maltitol alone or polypropylene glycol alone.

In the present invention, the content of maltitol in the composition is preferably 2 to 10% by weight, more preferably 4 to 7% by weight. If the content is less than 2% by weight, there may be a large amount of dusting on the surface of the solid soap during storage at low temperatures, or the hardness of the solid soap may not be sufficiently reduced. If it exceeds 10% by weight, the solidification property of the soap composition may be deteriorated, which is not preferable.

In the present invention, the content of polypropylene glycol in the composition is preferably 0.5 to 10% by weight, more preferably 2 to 6% by weight. The content is 0.5% by weight
If it is less than 10% by weight, dusting of the surface of the solid soap may occur during storage at a low temperature, or the hardness of the solid soap may not be sufficiently reduced. On the contrary, if it exceeds 10% by weight, It is not preferable because the transparency and foamability of the solid soap may be reduced. In the present invention, it is preferable to use polypropylene glycol having a molecular weight of 300 to 2000.

The transparent solid soap composition of the present invention comprises, in addition to saturated fatty acid soap, maltitol and polypropylene glycol, glycerin, polyglycerin (diglycerin, triglycerin, in order to effectively obtain the transparency of the solid soap. It may contain polyhydric alcohols such as tetraglycerin, hexaglycerin, etc.), propylene glycol, sorbitol, ethylene glycol and the like. In particular, with polyglycerin, not only better transparency but also solidification can be obtained. The content of the above polyhydric alcohol in the composition,
5 to 30% by weight is preferable. When the content exceeds 30% by weight, the solidification property of the soap composition is deteriorated, which is not preferable.

The transparent solid soap composition of the present invention may further contain known components within the range not departing from the object of the present invention. Known components include, for example, anionic surfactants, cationic surfactants, amphoteric surfactants, nonionic surfactants; bactericides; moisturizers (pyrrolidone carboxylic acid, sodium pyrrolidone carboxylate, hyaluronic acid, Polyoxyethylene alkyl glucoside ether, etc.); Oil; Fragrance; Dye; Chelating agent; UV absorber; Antioxidant; Natural extracts such as crude drugs (lecithin, saponin, aloe, psyllium, chamomile etc.); Nonionic, cationic or Anionic water-soluble polymers; usability improvers such as lactate esters; foaming improvers such as polyoxyethylene alkyl sulfate ester salts.

Conventional methods are used for producing the transparent solid soap. That is, saturated fatty acid soap, maltitol and polypropylene glycol, and other ingredients such as polyhydric alcohol are mixed to obtain a soap glue by a usual frame kneading method, and using this, a normal molding step, an aging step, A transparent solid soap is obtained by performing the shaping step. When a saturated fatty acid soap is prepared from a saturated fatty acid during the manufacturing process, it is carried out in the process of obtaining the above-mentioned soap glue.

[0017]

EXAMPLES The present invention will now be described in more detail with reference to examples, but the present invention is not limited to these examples.

Examples 1 to 13 and Comparative Examples 1 to 2 Saturated fatty acids were used in the proportions shown in Table 1. Ethanol (15% by weight) was added to this mixed saturated fatty acid, and the mixture was mixed with 50
Mix at ~ 70 ° C and 48% sodium hydroxide 6.81
Saturated fatty acid soap was obtained by neutralizing with a mixed aqueous solution of 4.1% by weight of potassium hydroxide and 4.1% by weight of potassium hydroxide (sodium / potassium ratio is 70/30 in molar ratio). 6 of this fatty acid soap
While maintaining the temperature at 5 to 80 ° C, add maltitol to this at 0 to 9.
6% by weight, polypropylene glycol (molecular weight 100
0) 0-9.6% by weight, sorbitol 0-9.6% by weight, sugar 10% by weight, glycerin 4% by weight, diglycerin 2.8% by weight and the balance of ion-exchanged water were added to form a soap glue. . Then, after adjusting the free alkali in the soap glue, the soap was poured into a pipe having a diameter of 70 mm to be cooled and solidified. After solidification, it was taken out from the pipe, cut into a thickness of 25 mm, and aged and dried at 25-30 ° C. for 45 days to obtain a transparent solid soap.

[0019]

[Table 1]

The component compositions of the transparent solid soap thus obtained are shown in Tables 2 and 3. Further, with respect to these transparent solid soaps, the transparency, the foaming property, the time-dependent powdering and the moldability were evaluated by the following methods. The results are shown in Tables 2 and 3.

[0021]

[Table 2]

[0022]

[Table 3]

<Evaluation Method> 1. Transparency The visible light transmittance of a transparent solid soap sample with a thickness of 1 mm was measured, and a transmittance of 40% or more was considered to be extremely good. ◎, 30% or more and less than 40% was evaluated as good. ○, 20% or more and 30%. Less than was slightly inferior, and when less than 20% or crystals were generated, it was judged as x.

2. A 1% aqueous solution of a foaming transparent solid soap is calcium carbonate 70ppm.
Of artificial hard water, and the mixture was stirred at 40 ° C. for a certain period of time with a mixer having a predetermined number of revolutions, and the amount of foam generated was measured. When the measured foaming amount was 2200 ml or more, it was judged as extremely good, when 2000 ml or more and less than 2200 ml, it was evaluated as good, and when it was 1800 ml or more and less than 2000 ml, it was slightly inferior and when it was less than 1800 ml, it was inferior.

3. Clear solid soap that has been powdered with time and pillow packaged (material: polypropylene) is used at -5 ° C (12 hours) and 15 ° C (12 hours).
Left for 1 month in a constant temperature bath set to cycle, then visually observing the powdering state of the transparent solid soap surface,
It was judged that there was no dusting phenomenon, ○ when there was little dusting phenomenon, and Δ when there was a lot of dusting phenomenon.

4. The surface of the moldable transparent solid soap was polished with warm water, the surface was dried, and then the mold was molded into a mold as shown in FIG. 100 preforms were prepared for each prescription, and the occurrence of side crevices was visually observed, and the moldability was evaluated according to the following criteria. Note that FIG.
Medium, R (diameter) = 70 mm, D1 = 22 mm, D2 =
2.5 mm, D3 = 2 mm, R1 and R2 are radii of curvature, R1 = 246.146 mm, R2 = 273.
It is 25 mm. ⊚: No cracks occurred. (0/100) ◯: Some cracks occurred (1 / 100-3 / 10)
0) Δ: A crack is generated (4 / 100-7 / 100) ×: A large amount of a crack is generated (8/100 or more).

From Tables 2 and 3, from Examples 1 to 13,
In the transparent solid soap in which maltitol and polypropylene glycol are blended, transparency, foaming property, time-dependent powdering and moldability are all in an acceptable range, and the content of maltitol is 2.0 to 10.0% by weight of Example 1
.About.5, and the content of polypropylene glycol is 0.
It is understood that the transparent solid soaps of Examples 7 to 12 of 5 to 10.0 are excellent in transparency, foamability, powder generation with time, and moldability.

On the other hand, in the case of the transparent solid soap containing no maltitol of Comparative Example 1 and the transparent solid soap containing no polypropylene glycol of Comparative Example 2, many powders were observed with the passage of time, and As a result, cracks were also found on the sides of the solid soap.

[0029]

As is clear from the above description, the transparent solid soap composition of the present invention contains maltitol and polypropylene glycol in a saturated fatty acid soap. The crystallinity is lowered, and therefore, it is possible to suppress the dusting of the solid soap surface due to the precipitation of crystals of the saturated fatty acid soap during storage at low temperature. Further, since the hardness of the solid soap is moderately lowered by the plasticizing action of maltitol and polypropylene glycol, even if the mold is shaped with a mold, no cracks will occur.

[Brief description of drawings]

FIG. 1 shows the shape of a transparent solid soap that has been mold-shaped.

[Explanation of symbols]

1 Transparent solid soap

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Tetsuo Nishina             610-1 Hara, Takatsuki-shi, Osaka F-term (reference) 4H003 AB03 AB44 BA01 DA02 EA21                       EB04 EB05 EB06 EB34 EB41                       ED02 FA10 FA16 FA18

Claims (7)

[Claims] 1. A saturated fatty acid soap, maltitol and polypropylene glycol are contained.
Transparent solid soap composition. 2. The content of maltitol is 2 to 10% by weight.
The transparent solid soap composition according to claim 1, which is 3. The transparent solid soap composition according to claim 1, wherein the content of polypropylene glycol is 0.5 to 10% by weight. 4. The transparent solid soap composition according to claim 1, wherein the saturated fatty acid soap is a mixed fatty acid soap of a linear saturated fatty acid having 14 to 18 carbon atoms and a branched saturated fatty acid having 14 to 18 carbon atoms. . 5. The transparent solid soap composition according to claim 1, wherein the saturated fatty acid soap is a mixed salt of saturated fatty acids containing sodium and potassium. 6. The sodium / potassium ratio is 9 in molar ratio.
The transparent solid soap composition according to claim 5, which is 5/5 to 55/45. 7. The transparent solid soap composition according to claim 1, wherein the saturated fatty acid soap content is 25 to 45% by weight.