JP2006045438A - Framed soap composition - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a framed soap composition with bubbles which maintains creamy bubble quality until it is completely consumed while keeping sufficient hardness. <P>SOLUTION: The framed soap composition with bubbles comprises (A) 25-50 mass% of a fatty acid soap comprising 5-31 mass% of an insoluble soap and 2-29 mass% of an unsaturated fatty acid soap in the total fatty acid soap, (B) 10-30 mass% of a polyol, (C) 2-6 mass% of an inorganic salt, and (D) 25-45 mass% of water, wherein the soap has a degree of crystallinity at the central part thereof of 1.19-2.0. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a bubble-containing frame kneaded soap composition that has sufficient hardness and maintains a creamy foam quality until the end of use.

Patent Document 1 describes a bubble-laminated soap composition that contains a fatty acid soap and a nonionic surfactant and is difficult to swell. Here, the fatty acid soap is also described that 80% by weight or more of the fatty acid soap is a saturated fatty acid for easy solidification, and at least 25% by weight is a lauric soap for improving foamability. .
However, in order to obtain a solid soap with sufficient hardness, not only the composition of the soap composition but also the conditions for cooling and solidifying are important.

In Patent Document 2, by clarifying the relationship between the gas compression ratio and the cooling time in the mold, the occurrence of shrinkage during cooling is prevented, and an aerated soap with excellent appearance is obtained with high productivity. Methods that can be described are described.
Patent Document 3 and Patent Document 4 propose a method for obtaining transparent soap by cooling at an average cooling rate of 0.1 to 7.0 ° C./min. However, although the cooling rate is different between the surface layer portion and the central portion of the soap, this point is not mentioned at all.

In Patent Document 5, in order to obtain soap in a uniform state, molten soap is filled in a mold cooled to -34 ° C to 4 ° C, and cooling to a soap center is not performed in a cooling time shorter than 5 minutes. Describes the technique of taking out from the mold and performing additional cooling.
Patent Document 6 discloses a technique using dry ice as a refrigerant. However, in order to use dry ice as a refrigerant, the mold must be brought into uniform contact with dry ice, resulting in non-uniform cooling of the soap, for example, up, down, left, and right.

Furthermore, even if it is a solid soap with sufficient hardness and has sufficient foaming properties at the start of use, the hardness will decrease during long-term use, or creamy foam quality will not be obtained Problems may arise.
Japanese Patent Laid-Open No. 10-168494 JP 2003-129096 A International Publication No. 96/04360 Pamphlet International Publication No. 96/04361 Pamphlet U.S. Pat. No. 2,987,484 International Publication No. 98/53039 Pamphlet

  An object of the present invention is to provide an aerated framed soap composition that has a sufficient hardness and maintains a creamy foam quality until the end of use.

  The present inventors use a fatty acid soap, a polyol, an inorganic salt and water having a specific composition in a specific ratio, thereby having a foamed framed soap that has sufficient hardness and maintains a creamy foam quality to the end. It was found that a composition was obtained.

The present invention includes the following components (A), (B), (C) and (D):
(A) In all fatty acid soap, 5-31 mass% insoluble soap, 25-50 mass% fatty acid soap containing 2-29 mass% unsaturated fatty acid soap,
(B) 10-30% by weight of polyol,
(C) Inorganic salt 2-6% by mass,
(D) Water 25-45 mass%
And a bubble-laden soap composition having a crystallinity of 1.19 to 2.0 at the center of the soap.

  The present invention also relates to a manufacturing process of a bubble-containing molten soap for manufacturing a molten soap containing spherical bubbles, an injection process of injecting the bubble-containing molten soap into a mold, and a cooling for cooling and solidifying the molten soap in the mold. Production of a bubble-mixed soap having an average cooling rate of 7 to 60 ° C./min at the soap surface layer and 0 to 2 ° C./min at the soap center portion. A method is provided.

  The foamed frame kneaded soap composition of the present invention has a sufficient hardness and maintains a creamy foam quality until the end of use.

  Examples of the fatty acid soap of component (A) used in the present invention include alkali metal salts (for example, sodium salts and potassium salts), saturated ammonium salts and alkanolamine salts (for example, monoethanolamine) of saturated or unsaturated fatty acids having 8 to 22 carbon atoms. Salt, diethanolamine salt, triethanolamine salt, etc.).

The fatty acid soap of component (A) contains 5 to 31% by mass, preferably 10 to 25% by mass of insoluble soap in the total amount of the component (fatty acid soap). When the insoluble soap is less than 5% by mass, the edge at the time of use is large, and when it exceeds 31% by mass, the foaming property is deteriorated and a lot of scum is generated.
Here, the insoluble soap in the fatty acid soap means a component insoluble in water under actual use conditions. Specifically, this corresponds to a fatty acid soap having a Kraft point of 60 ° C. or higher, and includes a saturated fatty acid salt having 16 or more carbon atoms. Therefore, the insoluble matter can be calculated from the analysis data of the fatty acid composition.

Moreover, the fatty acid soap of a component (A) contains 2-29 mass% of unsaturated fatty acid soap in this component (fatty acid soap) whole quantity, Preferably it is 5-27 mass%. If it exists in this range, foaming property will become favorable and foam quality will also become creamy. If the unsaturated fatty acid soap is less than 2% by mass, the difference in hardness between the surface layer and the center of the soap becomes difficult, and if it exceeds 29% by mass, the hardness of the entire soap will be low or the swell when used will be significant. .
By containing the unsaturated fatty acid soap in the fatty acid soap, the crystal state of the soap differs between the central part and the surface layer part, and the difference in crystallinity and hardness between the central part and the surface layer part easily occurs. This phenomenon is caused by the fact that saturated fatty acid soap molecules are arranged one-dimensionally, whereas unsaturated fatty acid soap molecules are arranged two-dimensionally. This is thought to be due to the deterioration.

  The fatty acid soap preferably contains at least 22% by mass and further 25% by mass of lauric acid soap from the viewpoint of foaming properties during use.

  As the fatty acid used for producing the fatty acid soap, two or more fatty acids can be used in combination. Use of at least one of coconut oil fatty acid and palm kernel oil fatty acid is preferable because the content of insoluble soap and unsaturated fatty acid soap can be reduced to the above range.

In order to keep skin irritation and fatty acid odor during washing low, the fatty acid used for producing the fatty acid soap of component (A) has a content of fatty acids having 10 or less carbon atoms of 1% by mass or less, in particular 0. It is preferably 5% by mass or less, more preferably 0.3% by mass or less. When using the said palm oil fatty acid and palm kernel oil fatty acid, it is preferable to give a top cut process.
Furthermore, in order to keep the amount of unsaturated fatty acid in the fatty acid soap within the above range, the palm oil fatty acid and palm kernel oil fatty acid may be subjected to slight hydrogenation.

  The fatty acid soap of component (A) is contained in an amount of 25 to 50% by mass, preferably 27 to 47% by mass, in the total composition of the foamed frame kneaded soap composition. If it is less than 25% by mass, sufficient hardness and foaming properties cannot be obtained, and if it exceeds 50% by mass, the fluidity of the molten soap is deteriorated, and a framed soap with good appearance cannot be obtained, or sufficient bubbles are contained. Problems such as inability to occur.

  Examples of the component (B) polyol used in the present invention include glycerin, sorbitol, xylitol, mannitol, glucose, polyethylene glycol, polypropylene glycol, water-soluble polysaccharides and the like. The molecular weight of polyethylene glycol and polypropylene glycol is preferably 8000 or less, and examples of water-soluble polysaccharides include sucrose, trehalose, hydroxyethyl cellulose, hydroxypropyl cellulose and the like.

  By using these polyols, effects such as reducing skin irritation when using soap, giving a moisturizing feeling after towel drying, lowering the viscosity of molten soap and improving fluidity, and improving hardness are obtained. Here, the hardness of the soap is improved because the fatty acid soap molecule is hydrogen-bonded to the OH group contained in the polyol during cooling to form a seed crystal, and the fatty acid soap crystal is generated using the seed crystal as a nucleus, and the crystal becomes fine. it is conceivable that.

  These polyols can use 1 or more types, and are contained in 10-30 mass% in the whole composition, Preferably it is 15-30 mass%, More preferably, it contains 20-30 mass%. When the amount is less than 10% by mass, the above effect is not exhibited. When the amount exceeds 30% by mass, a polyol precipitates during storage of the solidified soap.

Examples of the inorganic salt of component (C) used in the present invention include sodium chloride, sodium sulfate, sodium carbonate and the like, and one or more kinds can be used.
By using these inorganic salts, it is possible to improve the fluidity of the molten neat, improve the pouring property into the mold, and increase the hardness by increasing the soap crystals when solidified by cooling.
These inorganic salts are contained in the total composition in an amount of 2 to 6% by mass, preferably 2.5 to 6% by mass, particularly preferably 3 to 6% by mass. If the amount is less than 2% by mass, the above effect is not exhibited. If the amount exceeds 6% by mass, the foaming property during use decreases, and crystals are precipitated during storage of the solidified soap.

It is more preferable to use two or more of these inorganic salts. When two or more kinds are used, compared to the case of only one kind, a larger amount can be contained within a range where salting out does not occur, so that the viscosity of the molten soap becomes lower and a soap composition with higher hardness can be obtained.
In particular, it is more preferable to use sodium chloride and sodium sulfate in combination. In this case, the mass ratio of sodium chloride and sodium sulfate is preferably 1:50 to 40: 1, particularly 1: 4 to 6: 1.

  The component (D) water is contained in the total composition in an amount of 25 to 45% by mass, preferably 20 to 40% by mass, particularly preferably 22 to 35% by mass. If it is less than 25% by mass, the appearance of the solidified soap obtained by the poor flowability of the molten soap is poor, and the amount of the inorganic salt that can be contained decreases, making it difficult to obtain the effect of adding the inorganic salt. If it exceeds 45% by mass, the hardness of the whole soap becomes low, and the weight reduction when using the soap becomes severe.

The frame kneaded soap composition of the present invention can contain an amphoteric surfactant for the purpose of further increasing the foaming power. Examples of such amphoteric surfactants include betaine-type surfactants, amino acid-type surfactants, imidazoline-type surfactants, aminoxide-type surfactants, betaine-type surfactants, particularly fatty acid amidopropyl betaine, Sulfobetaine is preferred.
One or more amphoteric surfactants can be used, and 0 to 10% by mass, particularly 0 to 5% by mass, and more preferably 0.5 to 4% by mass are contained in the total composition.

In addition, for the purpose of enhancing the slip of the foam, a polymer compound such as highly polymerized polyethylene glycol, cationic polymer, cellulose, hydroxymethylcellulose, carboxymethylcellulose, methylcellulose and the like can also be contained.
One or more kinds of these polymer compounds can be used, and 0 to 5% by mass, particularly 0.1 to 3% by mass, and more preferably 0.25 to 2.5% by mass are contained in the total composition. .

The frame kneaded soap composition of the present invention further comprises a hydroxy acid ester surfactant, a monoglyceride surfactant, a sucrose ester surfactant, lactic acid for the purpose of further enhancing the stability of bubbles in the molten soap. An ester surfactant such as an ester surfactant can be contained. Among these, it is preferable to contain a lactic acid ester surfactant. These ester surfactants can be contained in the total composition in an amount of 1 to 10% by mass, particularly 2 to 5% by mass.
Moreover, 1-15 mass% of other nonionic surfactant, especially polyoxyethylene sorbitan higher fatty acid (C10-C20 saturated fatty acid) ester can be contained preferably 4-8 mass%.

  Furthermore, the frame kneaded soap composition of the present invention can contain additives such as antibacterial agents, fragrances, pigments, dyes, oils, and other mild agents. Here, examples of the antibacterial agent include triclosan and trichlorocarbanilide, and the content is preferably 0.1 to 2% by mass. Moreover, it is preferable that a fragrance | flavor, a pigment, dye, etc. contain 0.2-5 mass%. Examples of the oil include lanolin, paraffin, petrolatum, isopropyl myristate and the like, and it is preferably contained in an amount of 0.5 to 5% by mass.

  The frame kneaded soap composition of the present invention is obtained by, for example, heating and mixing components (A) to (D) and other components as necessary at 65 to 95 ° C. to obtain a molten soap. Manufacturing process of bubbled molten soap for manufacturing molten soap containing spherical bubbles by applying aeration treatment with an industrial aeration apparatus to contain small spherical bubbles, injection process of pouring molten soap containing bubbles into a mold And a cooling step of cooling and solidifying the molten soap in the mold.

  The temperature of the molten soap in the manufacturing process of the bubbled soap can be equal to or higher than the temperature showing substantially isotropic properties, and the bubbles can be made spherical, and the spherical bubbles can be uniformly dispersed. Therefore, it is preferable.

In order to prevent soap from spreading, it is preferable that the bubbles have a spherical shape with an average bubble diameter of 80 μm or less, particularly 60 μm or less and a major axis / minor axis ratio of 1.0 to 1.2. The lower limit of the average cell diameter is not particularly limited. However, when a normal industrial aeration apparatus is used, it is preferably 7 μm or more, particularly 15 μm or more in consideration of productivity.
Here, the average cell diameter is measured by using a microscope while foaming neat is sandwiched between two slide glasses (interval 150 to 180 μm) and rapidly cooled and solidified. After collecting the image data, the bubble diameter is measured on the image processing software Image-Pro Plus, and the average value is calculated. The long diameter / short diameter ratio of the bubbles is the same as when the inner diameter of at least 100 bubbles is measured by observing or photographing the cross section of the soap with a sharp blade and then using an electron microscope. The average value of the ratio of the major axis to the minor axis in the bubble.
Moreover, as a gas used in the aeration process, air, nitrogen gas, or the like can be appropriately selected and used.

  Next, bubbled molten soap is poured into the mold. For example, a method described in JP-A-2002-167599 can be used. As the mold frame, a cavity of a molding die having a cavity with a predetermined shape can be used. The temperature of the melted soap in this process is higher than the temperature showing almost isotropic properties. In addition, the spherical bubbles obtained in the molten soap manufacturing process can be maintained in an almost intact shape.

  The average cooling rate in the cooling process for cooling the molten soap in the mold is clearly different between the soap surface layer and the soap center, and contains unsaturated fatty acid soap to make the foam quality creamy. The performance is different between the soap surface layer and the soap center. That is, when an unsaturated fatty acid soap is contained, the hardness, easiness of melting, and the like can be controlled by controlling the average cooling rate of the soap surface layer portion and the soap center portion. Here, the average cooling rate can be adjusted by changing the refrigerant temperature, the cooling time, and the temperature of the molten soap in the pouring step.

The average cooling rate in the soap surface layer is 5 to 60 ° C./min, preferably 6 to 55 ° C./min, particularly preferably 7 to 45 ° C./min. The soap is taken out from the mold in a short cooling time. It is preferable because it becomes sufficiently hard.
The average cooling rate in the soap center is 0 to 2 ° C./min, preferably 0 to 1.9 ° C./min, particularly preferably 0 to 1.7 ° C./min. It is preferable because the hardness of the central portion can be lower than that of the soap surface layer portion, the foamability at the start and end of use does not deteriorate, and it can be used up to the end.
Here, the soap surface layer portion refers to a portion of 1 to 3 mm from the outermost surface of the soap.

  The refrigerant used in the cooling step is preferably a liquid. A gas has a lower heat transfer coefficient than a liquid and thus has a low cooling efficiency, and a solid is not preferable because it is difficult to increase the contact area. The temperature of the refrigerant to be used is preferably 1 to 14 ° C. because a soap with sufficient hardness can be obtained at an appropriate cooling rate. If the refrigerant temperature is 0 ° C. or lower, the dew condensation water on the surface of the mold and its surroundings freezes, making the mold difficult to move or not moving at all.

  The cooling time is preferably 40 to 300 seconds, particularly 45 to 240 seconds. Within this range, a sufficiently strong soap can be obtained, which is preferable.

In order to reduce the difference in hardness between the surface layer portion and the central portion of the soap, a cooling step can be performed after the cooling step, after which the frame kneaded soap taken out from the mold is cooled again. If the difference in hardness is small, it can be used without noticing the change in actual hardness.
The refrigerant temperature in the post-cooling step is preferably the same as or lower than that in the cooling step. The state of the refrigerant used here is not limited, but if it is a gas such as air, the apparatus for the post-cooling process can be simplified. In the case of using a gas, cooling for 15 minutes or longer, preferably 30 minutes or longer is preferable because a sufficient effect can be obtained.

  The volume fraction of the bubbles is preferably 10% or more, particularly 25% or more in consideration of the solidification rate, hardness or ease of dissolution of the frame kneaded soap composition. In addition, from a viewpoint of the intensity | strength of the soap composition obtained, it is preferable that it is 40% or less. The volume fraction of bubbles is calculated by 100-W by pouring foaming neat into a container with a volume of 100 mL and measuring the weight W (g) of the composition.

It can be confirmed by the following method that the framed soap composition obtained as a solid soap contains bubbles.
(1) Measure the specific gravity of the solid product. If the specific gravity is 1 or less, bubbles are contained.
(2) A solid product is thinly cut with a razor and observed with an optical microscope. The presence of round bubbles is confirmed.

The frame kneaded soap composition of the present invention has a crystallinity of 1.19 to 2.0, preferably 1.2 to 1.75 at the soap center. If the degree of crystallinity is less than 1.19, it is easy to swell and melts during use and cannot withstand actual use. On the other hand, if the degree of crystallinity exceeds 2.0, the amount of soap that is hard and dissolves during use is small, and the foaming property is poor.
The crystallinity means a peak intensity around 2θ = 30.4 degrees obtained by an X-ray diffraction method. Here, the peak around 2θ = 30.4 degrees is considered to be a peak derived from the ω-phase soap and the δ-phase soap. Here, the ω-phase soap and the δ-phase soap are phases that are relatively less likely to swell or collapse when immersed in water. In other words, the higher the degree of crystallinity in the soap center, the more it can be used without breaking down.

  Further, in the frame kneaded soap composition of the present invention, the hardness of the soap central part is 0.7 to 2.8, particularly 1.1 to 2.7. It is preferable.

The foaming property when using soap can be controlled by changing the composition of the fatty acid soap as described above or adding a surfactant other than soap. On the other hand, the present inventors have found that it greatly depends not only on the composition of fatty acid soap and the type and amount of other active agents, but also on the amount of active agents such as soap dissolved during use. Also, since the volume of soap decreases with use, consumption during use is reduced.
As a result, when the central part is lower than the surface layer part, the amount of soap dissolved at the time of use becomes the same at the beginning of use and at the end of use, and the same foaming property is maintained. This is preferable. Furthermore, since the surface layer portion hardness of the soap is high, there can be obtained an effect such that scratches and dents are hardly generated when the soap is conveyed.

Examples 1-6 and Comparative Examples 1-2
After producing 600 g of a soap composition having the composition shown in Table 1 at 70 to 85 ° C. and subjecting it to aeration treatment with a home whipping machine by batch operation, the obtained spherical bubble-containing molten soap was heated at 70 to 90 ° C. Poured into a mold and cooled and solidified under a predetermined cooling condition using water as a refrigerant to obtain a foamed kneaded soap composition. The shape of the soap was the same as a pure whip soap manufactured by Kao Corporation, and an aluminum mold was used. In addition, when the molten soap is poured into the mold and cooled and solidified, the soap surface layer is located 2 mm from the soap surface, the soap center is the temperature change at the soap center, The value measured by the pair and divided by the cooling time is shown.
The fatty acid composition of the mixed fatty acid soap used in the examples is as shown in Table 2.

The obtained frame kneaded soap composition was confirmed to contain bubbles by measuring the specific gravity.
In addition, after the frame-kneaded soap composition was sealed with an aluminum pillow and allowed to stand at room temperature for 3 days or more, the crystallinity, hardness, and foaming properties (fast foaming, foam amount, foam quality) ) Was evaluated. The results are also shown in Table 1.

(Evaluation methods)
(1) Crystallinity:
The frame kneaded soap composition was cut into approximately two pieces, samples were obtained from the center portion and the surface layer portion, and the crystal state was evaluated by X-ray diffraction under the following conditions. From the obtained chart, the ratio of the intensity I 30.4 in the vicinity of 2θ = 30.4 and the intensity I _{base of the} baseline was _defined as the crystallinity.
X-ray diffractometer: M21XG manufactured by Mac Science
(Measurement conditions) X-ray Cu Kα (wavelength 1.5405 mm)
Scan speed: 5deg / min
Tube voltage: 40kV
Tube current: 200mA

(2) Hardness:
Using a corkscrew having an inner diameter of 8 mm, the soap was cut out from the frame kneaded soap composition to obtain a sample having a thickness of about 5 mm. Here, the sample at the center of the soap was obtained from almost the center of the soap, and the sample at the surface layer was obtained from the portion excluding the outermost 2 mm. The Young's modulus was determined from the slope of the stress-strain curve obtained when the obtained sample was compressed under the following conditions, and was used as the hardness of the sample.
Testing machine: FUDOU company Compression speed: 2mm / sec Compressor: φ8mm

(3) Foaming property:
After taking out from the aluminum pillow, the following evaluation was performed at the time of the second hand washing and then at the time of hand washing after using the nylon towel 30 times.
(3-1) Quick foaming property;
A professional panelist used tap water at 35 ° C. and rubbed the frame kneaded soap composition 10 times, and then measured the amount of foam when the foam was made 10 times by hand.
(3-2) Amount of foam;
A professional panelist used tap water at 35 ° C., rubbed the frame kneaded soap composition 10 times, and then measured the amount of foam when the foam was made by hand 50 times.
(3-3) Foam quality;
When a professional panelist performed hand washing using tap water at 35 ° C., the value of a pure whip soap manufactured by Kao Corporation was set to 3, and was evaluated in five stages. The higher the number, the better.

  The soap compositions of Examples 1 to 6 have a crystallinity of 1.19 or more at the center of the soap, and even after 30 times of use, the quick foaming property, the amount of foam and the foam quality are reduced. In addition, the state of the soap after 30 times of use was not soft, and no melting or collapse was observed. Moreover, the hardness of the center part was sufficient. In particular, in Examples 1 to 3 and 6, in which both the crystallinity and the hardness were lower in the soap center than in the surface layer, the amount of foam at the 30th use was higher than at the start of use. On the other hand, Comparative Examples 1 and 2 in which the degree of crystallinity of the soap central part was less than 1.19 were both unusable in practical use because the soap state became Funyahunya after 30 uses.

Examples 7 and 8
In Example 7, the bubble-containing frame kneaded soap composition obtained by the method of Example 3 was enclosed in an aluminum pillow and immediately cooled in a freezer at −5.5 ° C. for 60 minutes. In Example 8, the bubble-containing frame kneaded soap composition obtained by the method of Example 6 was enclosed in an aluminum pillow and immediately cooled in a freezer at -15 ° C for 30 minutes.
Then, it carried out similarly to Examples 1-6, and evaluated crystallinity, hardness, and foamability (fast foaming property, foam amount, foam quality). The results are shown in Table 3.

  In both Examples 7 and 8, although the foaming property does not change, the difference in hardness between the soap surface layer portion and the central portion is reduced.

Claims (5)

The following components (A), (B), (C) and (D):
(A) In all fatty acid soap, 5-31 mass% insoluble soap, 25-50 mass% fatty acid soap containing 2-29 mass% unsaturated fatty acid soap,
(B) 10-30% by weight of polyol,
(C) Inorganic salt 2-6% by mass,
(D) Water 25-45 mass%
And a bubble-laden soap composition having a crystallinity of 1.19 to 2.0 at the center of the soap.   The foamed framed soap composition according to claim 1, wherein the soap has a central hardness of 0.7 to 2.8 MPa.   The bubble-containing frame kneaded soap composition according to claim 1 or 2, wherein both the crystallinity and hardness of the soap center are lower than the crystallinity and hardness of the soap surface layer.   The bubble-containing frame kneaded soap composition of any one of Claims 1-3 which contains 5-27 mass% of unsaturated fatty acid soap in the fatty-acid soap of a component (A).   The mold consists of a foamed soap production process that produces molten soap containing spherical bubbles, an injection process that injects foamed soap into the mold, and a cooling process that cools and solidifies the molten soap in the mold. A method for producing a bubble-blended soap having an average cooling rate of 7 to 60 ° C./min at the soap surface layer and 0 to 2 ° C./min at the soap center portion while the molten soap is cooled inside.