JPH0699297B2 - Bath agent composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a bath agent composition which prevents the feeling of bulkiness of the skin after bathing and makes the skin moisturized after bathing, and which is comfortable to use.

[Conventional technology]

2. Description of the Related Art Conventionally, various oily components such as animal and vegetable oils have been used in bath agents for the purpose of protecting the skin or improving the feel on the skin after bathing. For example, jojoba oil (JP-A-52-64415), terpene hydrocarbons (JP-A-60-252409) and esters thereof, lanolin, lanolin derivatives (JP-A-61-1930), fluid Paraffin (Japanese Unexamined Patent Publication No. 624363), squalane (see Japanese Unexamined Patent Publication No. 63-190819), and oily components such as propylene glycol are used.

Further, conventionally, when using an oily component, it is important to keep a large amount of water in the stratum corneum in order to improve the feel (moistness) of the skin after bathing and to reduce the stickiness after bathing. It had been. In addition, when selecting oily ingredients, in many cases, the findings found when applied to the skin in a normal state in the development of creams, lotions, etc. were directly applied to bath agents.

[Problems to be Solved by the Invention]

However, conventional bath preparations containing an oily component only apply the knowledge based on the feeling when or after being applied to the skin in a normal state to the bath preparation, and the feel on swollen skin is not felt. That is, no consideration was given to the skin condition after bathing, and therefore, it was not possible to sufficiently prevent the feeling of bulkiness of the skin after bathing, and the usability was poor.

Therefore, an object of the present invention is to provide a bath agent composition which prevents the feeling of bulkiness of the skin after bathing, makes the skin moisturized after bathing, and has a good feeling of use.

[Means for Solving the Problems]

In view of the peculiarity that the stratum corneum of the skin contains a large amount of water and greatly swells when taking a bath, the present inventors consider a new viewpoint,
As a result of intensive studies to find an oily component which has a very high occlusive property (moisture retention) in the presence of water and which has a good feel for swollen skin, an oily component combining liquid ester oil and an amorphous hydrocarbon However, it was found that the bathing agent composition containing the oily component has a very high occlusive property in the presence of water and has a good feel on swollen skin, and achieves the above-mentioned object.

The present invention was made based on the above findings, containing an ester oil that is liquid at room temperature and a non-crystalline hydrocarbon that is solid at room temperature, and the ratio (weight ratio) between the ester oil and the non-crystalline hydrocarbon. Is from 75:25 to 95: 5.

Hereinafter, the bath agent composition of the present invention will be described in detail.

The preferred liquid ester oil (liquid at room temperature) used in the present invention is an ester of a linear or branched fatty acid and a monohydric alcohol having a carbon number of 17 to 34, for example,
Examples thereof include cetyl octanoate, isopropyl myristate, isopropyl palmitate, octyldodecyl myristate, methyl stearate, and butyl stearate, with cetyl octanoate being particularly preferred.

In addition, examples of preferable non-crystalline hydrocarbon (solid at ordinary temperature) used in the present invention include paraffin hydrocarbons, and white petrolatum is particularly preferable.

The bath agent composition of the present invention exerts an excellent skin care effect by the action of the oil component composed of the liquid ester oil and the non-crystalline hydrocarbon, and these oil components are used directly or after being emulsified. To be

The liquid ester oil mainly has an effect of enhancing the feel and occlusivity on the skin, and the amorphous hydrocarbon mainly has an effect of enhancing the occlusivity and an effect of softening the skin.

If the ratio (weight ratio) of the liquid ester oil to the non-crystalline hydrocarbon deviates from the range of 75:25 to 95: 5, the occlusive property in the presence of water and the feel on the skin deteriorate.

The bath agent composition of the present invention can be mixed with bath agent raw materials used in ordinary bath agents. Examples of such a bath material include sodium sulfate, sodium hydrogen carbonate, sodium sulfate, sodium sesquicarbonate, sodium chloride, magnesium sulfate, sodium carbonate, sodium thiosulfate, succinic acid, fumaric acid, purified water, ethyl alcohol,
Squalane, olive oil, mink oil, potassium myristate and the like can be mentioned, and one or more of these can be appropriately selected and used.

The liquid ester oil and the non-crystalline hydrocarbon can be added at any stage of manufacturing the bath composition,
The addition amount thereof is preferably an amount such that the total amount of both is 60 to 100% by weight in the oily component, and the total amount of both is preferably 0.1 to 80 parts by weight with respect to 100 parts by weight of the bath agent composition, and particularly, 0.1 to 2 when the formulation of the bath agent composition is powder
0 parts by weight, and in the case of bath oil, 5 to 80 parts by weight are suitable. The bath agent composition of the present invention may consist of only the above-mentioned two essential components.

The bath agent composition of the present invention can be made into various forms such as a liquid agent, a powder agent, and a tablet, similarly to known bath agents.

Incidentally, the bath agent composition of the present invention is used by adding it to the bath water at the time of bathing, and in that case, the concentration of the oily component is usually 0.5 to 1 in the bath water.
It is preferable to determine the amount to be used once so as to be 000 ppm, particularly 10 to 200 ppm.

〔Example〕

Hereinafter, the present invention will be described in more detail by showing Examples, Comparative Examples, and Test Examples of the present invention, but the present invention is not limited to these Examples.

Examples 1 to 7 and Comparative Examples 1 to 5 Bath compositions were prepared according to the formulations shown in Table 1 below.

Example 8 and Comparative Example 6 Using the bath agent compositions of Example 2 and Comparative Example 1, the following second
Each bath agent composition was prepared according to the formulation shown in the table. These bathing agent compositions are light yellow transparent liquids having fluidity, and when they are dissolved in a bath water, they self-emulsify and become milky.

Test Example 1 The bathing agent compositions of Examples 1 to 7 and Comparative Examples 1 to 5 were subjected to the following tests (1) and (2). The results are shown in Table 1 above.

(1) Occlusion test i) Non-aqueous system 0.5 cc of distilled water was put into a sample bottle for a liquid chromatograph autosampler with a diameter of 5 mm, which was capped with a cellulose membrane having a diameter of 6 mm, and the center of the cellulose membrane was 5 μm. Each bath agent composition is dropped and weighed. This metric was Xag. This is left in the desiccator for 24 hours and then weighed again. This metric was Yag. On the other hand, the measured value was Xcg in the case of only the cellulose membrane (when the bath agent composition was not dropped), and it was Ycg when it was left in the desiccator for 24 hours and then measured again. The occlusivity was calculated by the following formula.

ii) Water-containing system 0.5 cc of distilled water was put into a sample bottle for a liquid chromatograph autosampler with a diameter of 5 mm, and a 5 μm distilled water was added dropwise to the center of the cellulose membrane. After that, 5 μm of each bath agent composition was dropped and weighed. The measured value was Xag. This is left in the desiccator for 24 hours and then weighed again. The measured value is
It was Yag. On the other hand, the measured value is Xcg when only 5μ of distilled water is dropped in the center of the cellulose membrane (when the bathing agent composition is not dropped), and this is put in a desiccator.
After standing for 4 hours, it was Ycg when weighed again. The occlusivity was calculated by the above formula as in the case of the non-aqueous system.

(2) Feeling test i) Normal skin Each bath agent composition was applied to the forearms of 15 panelists, and the feel of the skin after application was evaluated according to the following criteria.

◎: Very good feeling such as very smooth skin was obtained 〇: Good feeling such as smooth skin was obtained △: Slightly good such as slightly smooth skin The same feeling as before the application was obtained, or the feeling was worse than that before the application. Ii) Swelled skin The forearm was immersed in 40 ° C bath water for 10 minutes before application, and then each bath composition The product was applied and the feel of the skin after application was evaluated according to the same criteria as in the case of normal skin described above.

The following can be seen from the above test results.

The occlusive properties of oil agents such as liquid paraffin (Comparative Example 1) and jojoba oil (Comparative Example 2), which are often mixed with conventional bath salts, are
High values are shown for both non-aqueous and hydrous systems. However, in terms of feel, the skin was good, but the swollen skin had a sticky feeling and a squeaky feeling, and was poorly evaluated. In addition, an oil agent which has a good feel on swollen skin has a poor occlusive property, and a moisturizing effect due to the occlusive property cannot be expected.

Further, when only cetyl octanoate is used (Comparative Example 3), the feel of swollen skin is slightly good, but the occlusive property is poor in both non-aqueous and hydrous systems. Also, cetyl octoate 70
When 30 parts by weight of vaseline is added to parts by weight (Comparative Example 4)
Has a high occlusivity in both the non-aqueous system and the water-containing system, but the feel to swollen skin becomes poor.
Furthermore, when the amount of petrolatum added was increased, the stickiness became poor and the feeling was very poor.

Conventionally, when 10 parts by weight of reduced lanolin, which has been conventionally mixed in a bath agent, is mixed with 90 parts by weight of cetyl octanoate (Comparative Example 5), the non-aqueous clogging property is high, but the clogging of the water-containing system is shown. The value was very low.

In contrast, when 5 to 25 parts by weight of petrolatum was added to 95 to 75 parts by weight of cetyl octanoate (Examples 1 to 5), the occlusive property was high in both cases of non-aqueous system and hydrous system, and swelling occurred. The feel on the skin was very good. Also, when 90 parts by weight of isopropyl myristate was mixed with 10 parts by weight of vaseline (Example 6) and when 90 parts by weight of octyldodecyl myristate was mixed with 10 parts by weight of vaseline (Example 7), the occlusive property was It was very good.

Test Example 2 The bathing agent compositions of Example 8 and Comparative Example 6 were subjected to the following test (3). The results are shown in Table 3 below.

(3) Measurement of skin conductance High frequency impedance meter (Model IB-4 manufactured by IBS)
The skin conductance at 00) was measured as follows. Dissolve 10 g of each bath preparation composition in 40 ° C. bath water, soak the forearm in it for 10 minutes, measure skin conductance at 10 minutes, 30 minutes, and 60 minutes after bathing, and do not dissolve the bath preparation composition The value was calculated as a relative value with 100 in the case of hot water.

The following can be seen from the above test results.

The bath agent composition (Example 8) of the present invention provided an excellent effect of moisturizing the skin after bathing. On the other hand, the bath agent composition of Comparative Example (Comparative Example 6) is
The skin was not moist and had a bad feel.

Example 9 A bath agent composition (bath oil) having the following composition was prepared using the bath agent composition of Example 2. This bath agent composition was extremely moisturized and improved the feeling of bulkiness of the skin after bathing.

80 parts hexyldecanol ...... 10 parts isopropyl myristate ...... 5 parts methylparaben ...... 0.05 parts fragrance ...... 4.05 parts Example 10 Using the bath composition of Example 2, A bath agent composition (liquid) having the following composition was prepared. This bath agent composition was extremely moisturized and improved the feeling of bulkiness of the skin after bathing.

Bath agent composition of Example 2 ...... 30 parts Methylparaben ...... 0.1 parts Polyoxyethylene alkyl ether ...... 4 parts Glycerin ...... 23 parts Fragrance ...... 1 part Purified water ...... 41.9 parts Example 11 Example 2 A bath agent composition (bath salt) having the following composition was prepared using the bath agent composition. This bath agent composition was extremely moisturized and improved the feeling of bulkiness of the skin after bathing.

2 parts sodium sulphate ...... 40 parts sodium hydrogencarbonate …… 45 parts sodium sesquicarbonate …… 10 parts fragrance …… 0.2 parts dextrin …… 5 parts chromophore …… slightly carried out Example 12 Using the bath agent composition of Example 2, a foamable bath agent composition having the following composition was prepared. This bath agent composition was extremely moisturized and improved the feeling of bulkiness of the skin after bathing.

Bath preparation composition of Example 2 ...... 10 parts Sodium bicarbonate ...... 20 parts Sodium carbonate ...... 10 parts Succinic acid ...... 25 parts Polyoxyethylene alkyl ether ...... 2 parts Perfume ...... 0.5 parts Dextrin ...... 30 parts [Effects of the Invention] According to the bath agent composition of the present invention, it is possible to prevent the feeling of bulkiness of the skin after bathing and to make the skin moisturized after bathing,
Moreover, the bath agent composition of the present invention has a good feeling in use.

Claims (4)

[Claims] 1. An ester oil that is liquid at room temperature and an amorphous hydrocarbon that is solid at room temperature, and the ratio (weight ratio) of the ester oil to the amorphous hydrocarbon is 75:25 to 95: 5. Which is a bath agent composition. 2. The bath agent composition according to claim 1, wherein the total amount of the ester oil that is liquid at room temperature and the amorphous hydrocarbon that is solid at room temperature is 60 to 100% by weight in the oil component. 3. The bath agent composition according to claim 1, wherein the ester oil which is liquid at room temperature is a monohydric alcohol ester of fatty acid, preferably an ester having 17 to 34 carbon atoms, and more preferably cetyl octanoate. object. 4. The bath agent composition according to claim 1, wherein the non-crystalline hydrocarbon that is solid at room temperature is a paraffinic hydrocarbon.