JP2971346B2 - Cosmetic bar soap - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved composition of a cosmetic soap bar. More specifically, the present invention relates to a cosmetic soap bar that has low irritation, is excellent in usability, and has excellent foaming properties and cleaning performance.

[0002]

2. Description of the Related Art Conventionally, solid cosmetic detergents have been mainly composed of fatty acids. Therefore, there is a problem in terms of skin irritation, and in particular, there is a problem in terms of foaming properties in hard water and detergency. In order to improve such disadvantages of the conventional products, various improved compositions have been proposed and developed.

[0003] The improved composition is mainly composed of a super-fat soap containing an excess of a fatty acid, secondly a triethanolamine salt of a fatty acid having a relatively low PH value, or thirdly. Those using an anionic surfactant such as sodium lauryl sulfate which is almost neutral, and fourthly, those mainly containing a weakly acidic agent such as sodium N-acylglutamate.

[0004] However, even in these improved cleaning agents,
The first and second ones have a disadvantage that the PH value is higher than 9, and the third and fourth ones have a slimy feeling and a rustle feeling after use. There were problems with usability and safety. For this reason, ether carboxylate has been found as a surfactant capable of obtaining a cosmetic cleaner excellent in foaming properties, detergency, hypoallergenicity, excellent usability, and safety. Cosmetic cleaners have also been developed.

As a conventional example, Japanese Patent Laid-Open Publication No.
Japanese Patent Application Laid-Open No. 9-175799 (hereinafter referred to as "Prior Art 1"), Japanese Patent Application Laid-Open No. 2-175799, "Detergent Composition" (hereinafter referred to as Prior Art 2), and Japanese Patent Application Laid-Open No. 2-155.
No. 994, “Hypoallergenic solid detergent” (hereinafter referred to as Prior Art 3)
That. ).

[0006]

Prior Art 1 discloses a cosmetic detergent mainly comprising an ether carboxylate. Among them, a liquid solid, a jelly-like or a creamy one, and a transparent solid soap are disclosed as Formulation Example 2 on page 10 of the publication. However, in this formulation, since the main surfactant is two kinds of ether carboxylate (that is, a sodium salt of stearyl ether carboxylic acid and an ammonium salt of coco alkyl ether carboxylic acid), especially the solid surfactant is used. Has the disadvantage that it may not solidify in some cases. From this point, the cleaning agents disclosed therein are mainly used as liquids, jellies or creams.

[0007] The contents disclosed in the prior art 2 which includes and improves the contents of the prior art 1 are also similar to the above.
It is mainly used as liquids, jellies or creams, and does not include usage as solids.

[0008] Prior art 3 relates to a solid detergent, but the disclosed composition has a high PH value exceeding 9.0 due to an excessive amount of soap. Become . Therefore, there are still problems in terms of safety and low irritation.

In the present invention, therefore, excellent low irritation, safety, and usability such as a refreshing feeling based on the addition of an ether carboxylate are maintained, and at the same time, as a solid agent,
It does not dissolve and has excellent foaming and cleaning performance.
Further, in some cases, it was an object to provide a transparent cosmetic soap having a transparent state.

[0010]

Means for Solving the Problems In order to achieve the above object, according to the present invention, a cosmetic solid soap is constituted as follows. That is, a higher fatty acid soap, in the general formula _{RO- (CH 2 CH 2 O)} n CH 2 COOM ( wherein, R is derived a hydrogen atom, an alkali metal, alkaline earth metal, ammonia or a lower amine and the ether carboxylate represented by the cation), a weight ratio of 1
It is contained as an essential surfactant component in a proportion of pairs 2-8
Is, the surfactant component is characterized by comprising been contained in a proportion of less than 80 wt% 50 wt% or more of the entire soapstock.

The ether carboxylic acid represented by the above general formula is a carboxy ether salt of a fatty acid alcohol or an ethylene oxide adduct thereof.

As the alkyl group of R in the above general formula of the ether carboxylate, those having 12 to 18 carbon atoms can be applied. However, when a transparent solid soap is intended, the carbon number of 12 carbon atoms can be used. Are preferred in that they are excellent in transparency. When the carbon number is less than 12, a solid in a stable state cannot be obtained, and the skin irritation at the time of use is high. Has a PH value exceeding 9,
Also, it is difficult to obtain a transparent one.

The number of moles of ethylene oxide added to the ether carboxylate ranges from 5 to 15;
Further, the transparency is preferably 6 or more and 10 or less from the viewpoint that the transparency can be stably secured. If the number of added moles is less than 5 moles, solidification becomes difficult, and if it exceeds 15 moles, it becomes difficult to maintain uniformity and difficult to maintain transparency.

As for M in the carboxyl group of the ether carboxylate, sodium and potassium are used as alkali metals, calcium and magnesium are used as alkaline earth metals, and mono- and cations are used as cations derived from lower amines. It includes a lower alkylamine cation formed by an alkylamine such as di- and tri-ethylamine, and a basic amino acid cation formed by a basic amino acid such as arginine and lysine.

The ether carboxylate to be used in the present invention can be produced by a method in which a monohaloacetic acid or a salt thereof is reacted with a specific ethylene oxide adduct of an aliphatic higher alcohol and neutralized with an alkali.

Specific examples of the ether carboxylate represented by the above general formula include carboxymethyl ether sodium salt of coconut oil alcohol (ethylene oxide addition mole number 6), potassium salt of carboxymethyl ether lauryl alcohol ( Ethylene oxide addition mole number 6), triethanol ammonium salt of carboxymethyl ether of tallow alcohol (ethylene oxide addition mole number 10), and the like.

Next, as the higher fatty acid soap component of the present invention, an opaque or transparent material obtained by an ordinary method using existing general raw material components can be used. For example, animal fats such as beef tallow, coconut oil,
A vegetable oil such as palm oil can be used alone or in combination. As the soap component, those composed of salts such as alkali metal salts (sodium salt, potassium salt, etc.), ammonium salt, lower alkanol amino salt, etc., obtained by saponifying and neutralizing the fatty acid of this oil and fat raw material by a conventional method are included. It is.

In the present invention, the surfactant comprising the higher fatty acid soap and the ether carboxylate is as follows:
Although it can be blended in a quantitative ratio in the range of 50 to 80% by weight of the whole soap raw material, the blending amount is preferably 60 to 70% by weight from the viewpoint that a uniformly solidified state is stably obtained. When the amount is less than 50% by weight, solidification becomes difficult. When the amount exceeds 80% by weight, uniform dissolution cannot be achieved. Also, in this case, solidification becomes difficult when the amount of the fatty acid soap is less than 5% by weight of the whole soap raw material, and when the amount exceeds 15% by weight, solidification is difficult.
The H value becomes a high value exceeding 9.

The above-mentioned higher fatty acid soap and ether carboxylate can be compounded in a ratio of 1: 2 to 8 by weight.
From the viewpoint of obtaining an H value, it is preferable to set the mixing ratio to 1 to 3 to 6.

Further, in order to obtain the cosmetic solid soap of the present invention, in addition to the above-mentioned surfactant, a lower alcohol such as ethyl alcohol is used, if necessary, in an amount of 0 to 20% by weight and the remaining water. Can be In addition, as long as the effects of the present invention are not impaired, the following known functional components can be appropriately compounded.

For example, anionic surfactants, cationic surfactants, amphoteric surfactants, nonionic surfactants, humectants such as pyrrolidone carboxylic acid and its salts, hyaluronic acid, polyoxyethylene alkyl glucoside ether, lecithin, saponin , Natural extracts such as aloe, psyllium, chamomile, bactericides, chelating agents, ultraviolet absorbers, antioxidants, pigments, nonionic, cationic or anionic water-soluble polymers, usability improvers such as lactate esters, Foam improvers such as polyoxyethylene alkyl sulfates, fragrances, cosmetics, and physical property improvers.

The cosmetic soap bar of the present invention can be obtained by the following production method. That is, a higher fatty acid soap component is prepared by an ordinary method, and then the higher fatty acid soap component, an ether carboxylate, ethanol, and ion-exchanged water are mixed, and the mixture is heated to 70 to 80 ° C. to be uniformly dissolved. The solution can be prepared by pouring the solution into a predetermined mold, cooling, solidifying, drying, and aging.

[0023]

According to the present invention, the following operations occur. When the higher fatty acid soap and the ether carboxylate are neutralized in the above heated solution, the solution has a solidifying action under cooling.

The solid soap obtained by the solidifying action ensures uniformity, and in particular, when the higher fatty acid soap is made of a transparent material, the solid soap has high transparency.

The solid soap has excellent foaming properties and washing performance not only in soft water but also in hard water, does not dissolve, and has low irritation and low pH.
In addition to the value conversion, the effect of improving usability such as a refreshing feeling is produced.

[0026]

EXAMPLE First, myristic acid, palmitic acid, and stearic acid were mixed at a weight ratio of 70:10:20 to form a mixed fatty acid. Ethanol was added to the mixed fatty acid, which was added to a reaction vessel. To about 60 ° C., and then neutralized by pouring an aqueous solution of sodium hydroxide into the mixture to obtain a higher fatty acid soap component.

Next, the higher fatty acid soap, sodium carboxylated POE (10) lauroyl ether which is an ether carboxylate, ethanol and 1,3
Table 1 shows the relationship between butylene glycol and ion-exchanged water.
And heated to a temperature of 70 ° C. to 80 ° C. to be uniformly dissolved, and poured into a mold. Thereafter, a solid soap was obtained through the steps of cooling, drying and aging.

[Table 1]

The numerical values in Table 1 are% by weight, and the characteristics are based on the obtained bar soap. Also,
Regarding the characteristics, the solidification property was indicated by ○ when the solidified state was obtained as a whole, and x when the solidified state was not obtained as a whole. In addition, the uniformity was indicated by a visual observation as ○ when the whole was uniform, △ when a part of the crystals precipitated, and X when the whole was crystallized. Transparency is measured when the obtained solid soap is cut into a slice of 20 mm in thickness and used as a sample, and the sample is placed on a paper printed in type (26 points), and the type is clearly readable. 、, when clear but not legible △, when not legible at all ×.

In addition, the foaming was performed by female panelists (20 persons,
Age 20-30 years old), take the solid soap in a normal face-washing mode, whisk it with tap water, and average the obtained evaluation. When the foaming was poor, it was indicated by x. The moist feeling was evaluated by a female panelist (20 persons, age 20 to 30 years old) who took the solid soap in his usual face washing mode, lathered it with tap water and washed his face. On average, the evaluation was indicated by 感 when the moist feeling was extremely good, by Δ when the feeling was normal, and × when no moist feeling was obtained. The PH value is
A 1% aqueous solution of the solid soap was used, and the measurement was performed at a temperature of 25 ° C.

From the results shown in Table 1, the solidification property and the uniformity are excellent except for the case where the mixing ratio of the higher fatty acid soap and the ether carboxylate is 1: 9 or more by weight (Execution symbols A to D). It can be seen that a solid soap having effective foaming and usability (moist feeling) as a cosmetic soap and having a low PH value (9 or less) can be obtained. In particular, when the ratio of the amount of the surfactant composed of the higher fatty acid soap and the ether carboxylate in the soap is 70% by weight or more (execution symbols G, H, K, and L), the foaming performance is excellent. It can be seen that the result is obtained.

Next, the effect of the addition mole number of ethylene oxide (hereinafter abbreviated as “EO”) of the ether carboxylate in the bar soap was tested as follows. Carboxylated PO as ether carboxylate
With respect to sodium E lauroyl ether, one having an EO addition mole number of 1 to 38 was prepared, and 65% by weight of this ether carboxylate, 15% by weight of the above-mentioned higher fatty acid soap, 5% by weight of ethanol and 15% by weight of ion-exchanged water were used. Solid soap was obtained by the method described above for the component blending, except that the number of moles of EO added was 3 or less. Various properties of these bar soaps are shown in Table 2 below.

[Table 2]

From the results shown in Table 2, when the number of moles of EO added to the ether carboxylate is 5 or more and 12 or less (execution symbols O, P, Q and R), the solidification property, uniformity, foaming, and usability (moist) are obtained. It can be seen that a solid soap having excellent feeling and low pH value and excellent transparency can be obtained.

Next, the influence of the number of carbon atoms in the alkyl chain of the ether carboxylate in the solid soap was tested as follows. For sodium carboxylated POE (10) alkyl ether as an ether carboxylate, one having an alkyl chain having 12 to 18 carbon atoms is prepared, and 65% by weight of the ether carboxylate and 15% by weight of the above-described higher fatty acid soap ethanol Solid soaps were respectively obtained by the above-mentioned method with the components of 5% by weight and 15% by weight of ion-exchanged water. Various properties of these bar soaps are shown in Table 3 below.

[Table 3]

From the results in Table 3, it can be seen that, in all cases where the alkyl chain has 12 to 18 carbon atoms (conventional symbols U, V and W), the solidification and uniformity are excellent, and foaming is effective as a cosmetic soap. It can be seen that a solid soap having a low pH value and a good usability (moist feeling) can be obtained. In particular, it can be seen that when the number of carbon atoms is 12 (Symbol S), an excellent transparency can be obtained.

(Comparative Test) Next, the solid soap G 'according to the present invention and the conventional solid soap (conventional symbols a to c) were examined for the properties of moist feeling, slimy feeling, crisp feeling and hard water resistance.
Comparative test was performed, and the results are shown in Table 4 below.

[Table 4]

The higher fatty acid soaps are the same as those listed in Table 1. In addition, the slimy feeling and the feeling of
Female panelists (20 persons, 20 to 30 years old) took the solid soap in the usual face washing mode, lathered it with tap water, washed the face, and evaluated as an average of the sensitivity obtained for each person after the face washing. When there is no slimy feeling, when there is a slimy feeling but the degree is small, when the degree is extremely large, and when there is no swelling feeling, when there is no swelling feeling, when there is a slight swelling feeling, When extremely large, it was indicated by x.

The hard water resistance is the same as that of female panelists (20
By the name), in the normal face washing mode, whipping operation with 150 ppm hard water in a state where the solid soap was taken,
The bubbling state at that time was evaluated as an average for each person, and was evaluated as ○ when foaming was good, Δ when normal, and x when poor.

From the results shown in Table 4, it can be confirmed that the solid soap according to the present invention has better performance for each property than the conventional product.

[0039]

Since the present invention is configured as described above, the following effects are exhibited. In the present invention, since the ether carboxylate having a certain range of the number of moles of EO added is contained in a certain ratio together with the higher fatty acid soap, it has excellent solidification properties and uniformity, and is used not only in soft water but also in hard water for cosmetic use. In this case, effective foaming is obtained, whereby a solid soap having good detergency, excellent usability and safety can be obtained.

In particular, a solid soap excellent in transparency can be obtained by selecting an ether carboxylate having a certain range of the number of moles of EO addition and the number of carbon atoms of an alkyl chain.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor: Nobuyoshi Saito, 2-13-13 Himejima, Nishiyodogawa-ku, Osaka-shi P & P Co., Ltd. (72) Inventor: Tetsuo Nishina 2--13, Himejima, Nishiyodogawa-ku, Osaka-shi No. 26 P & P Corporation (56) References JP-A-2-155994 (JP, A) JP-A-64-75597 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) A61K 7/00-7/50 C11D 9/00-9/26

Claims (3)

(57) [Claims] (1) a higher fatty acid soap and the following general formula: RO- (CH ₂ CH ₂ O) _n CH ₂ COOM (where R is a hydrogen atom, an alkali metal, an alkaline earth metal, ammonia or a lower amine; and ether carboxylate represented by the induced cation) is a weight ratio of 1
It is contained as an essential surfactant component in a proportion of pairs 2-8
Is, cosmetic bar soap The surfactant component is characterized by comprising been contained in a proportion of less than 80 wt% 50 wt% or more of the entire soapstock. 2. The cosmetic solid soap according to claim 1, wherein the number of moles of ethylene oxide added to the ether carboxylate n is 5 or more and 15 or less. 3. The compound represented by the general formula (I)
Is an alkyl group having 12 carbon atoms, the cosmetic solid soap according to claim 1 or 2, wherein