JP2002370931A - Oily composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase stability of oily composition containing an unsaturated fatty acid having drastic nasty smell and discoloration with time. SOLUTION: This oily composition comprises oil containing the unsaturated fatty acid, and trehalose, water and a nonionic surfactant.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a technique for improving the storage stability of an oily composition containing an unsaturated fatty acid.

[0002]

2. Description of the Related Art There are many cosmetics based on oil. In particular,
Oil-like cleansing cosmetics often incorporate an oil containing unsaturated fatty acids from the viewpoint of feeling of use and cleansing effect.

[0003]

However, there has been a problem that the oil containing unsaturated fatty acids is liable to cause odor and discoloration over time. Therefore, in order to enhance the feeling of use and cleansing effect, even if the formulation contains an oil containing unsaturated fatty acids, from the viewpoint of storage stability of the product,
In many cases, it cannot be blended, and a technique that does not cause discoloration or discoloration has been desired.

[0004] The present inventors have made intensive studies particularly on a technique for enhancing the aging stability of an oil-based cleansing cosmetic composition.
It has been found that when trehalose is converted into an aqueous solution and blended together with a nonionic surfactant in an oil cleansing cosmetic, the stability of the oil containing unsaturated fatty acids with time is remarkably enhanced, and the present invention has been completed.

An object of the present invention is to provide an oil composition having high storage stability.

[0006]

The present invention is as follows.

(1) An oil composition containing an oil containing unsaturated fatty acids, trehalose, water and a nonionic surfactant. (2) The above oil composition wherein the content of trehalose is 0.005 to 1.0% (mass percentage) based on the total amount of the oil composition. (3) The content of water is 0.1 to 1 with respect to the total amount of the oil composition.
The oily composition described above which is 0.0% (percent by mass). (4) The above oil composition, wherein the oil composition is a cleaning composition. (5) The above oil composition, wherein the cleaning composition is a cleansing cosmetic. (6) A method for stabilizing an oily composition, wherein trehalose, water and a nonionic surfactant are contained in an oil component containing an unsaturated fatty acid.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.

The present invention is a technique in which the stability over time of an oil containing unsaturated fatty acids is enhanced by using trehalose, water, and a nonionic surfactant. The field of application of the oil composition of the present invention is not limited. It can be applied to various uses such as foods, pharmaceuticals, quasi-drugs, various cleaning agents, and industrial oils.
In particular, it is preferably used in the field of cosmetics requiring stability over time.

The oil component blended in the oil composition of the present invention is:
An oil containing unsaturated fatty acids in the molecule. Many vegetable oils fall into this oil category. For example, olive oil, almond oil, peanut oil, avocado oil, castor oil, cocoa oil, cottonseed oil, palm oil, sesame oil, corn oil, rapeseed oil, bran oil, linseed oil, perilla oil, kaya oil, safflower oil, soybean oil, kiri oil , Kapok oil, kuromoji oil, sasanqua oil, camellia oil, teaseed oil and the like. One or more oil components whose molecules are composed of these unsaturated fatty acids are blended.

The amount of the oil component in the oil composition is not limited. It is appropriately determined according to the target product (use).

The oil composition of the present invention may contain other oil components. For example, liquid paraffin, synthetic paraffin, squalane, ester oils (isopropyl myristate, cetyl 2-ethylhexanoate, glycerin tri-2-ethylhexanoate, etc.), vegetable oils (macadamia nut oil, jojoba oil, etc.), fatty acids (lauric acid, Isostearic acid, etc.), higher alcohols (lauryl alcohol, isostearyl alcohol, oleyl alcohol, etc.), and silicone oils (dimethicone, etc.).

When the oil composition of the present invention is used as a cleansing cosmetic, an appropriate amount of the above oil is blended according to the feeling of use and the cleansing effect. Usually, the oil (all oils) is 40% of the total amount of the cleansing cosmetic.
-95% (mass percentage), preferably 60-90%
(Percent by mass). The oil containing unsaturated fatty acids in the molecule is 1.0 to 1.0% based on the total amount of the cleansing cosmetic.
90% (% by mass), preferably 10 to 60% (% by mass) is blended. The oil component is preferably in a liquid or paste form in a cleansing product, but there is no problem even if the raw material itself is solid.

Trehalose used in the present invention is a known cosmetic ingredient. The trehalose content is appropriately determined depending on the amount of the oil component to be stabilized and the composition of the oil composition. It is preferably 0.005 to 1.0% (mass percentage) based on the total amount of the oil composition.

Trehalose, when dissolved in water, contributes to the stabilization of oil. As the water, tap water, ion exchange water, distilled water, mineral water, seawater, hot spring water, and deep sea water can be used. The water content is appropriately determined by the trehalose content. It is preferably 0.1 to 10.0% (mass percentage) based on the total amount of the oil composition. If it is less than 0.1% by weight, the amount of trehalose dissolved in water is limited, and depending on the content of oil containing unsaturated fatty acids, the effect of preventing discoloration and discoloration is weakened.

Ethanol (or denatured alcohol) can be added to water. When using the oily composition as an oily cleansing cosmetic, the blending amount of water and ethanol is 0.1% based on the total amount of the cleansing cosmetic.
~ 10.0% (mass percentage) is preferred.

The nonionic surfactant used in the present invention is not limited. Specifically, the following surfactants are exemplified. Sorbitan fatty acid esters include sorbitan monolaurate and sorbitan sesquiisostearate. Glycerin fatty acid esters include glycerin monooleate and glycerin monoisostearate. Among polyglycerin fatty acid esters, diglyceryl monooleate and decaglyceryl diisostearate. Among polyoxyethylene sorbitan fatty acid esters, polyoxyethylene sorbitan monooleate (6EO) and polyoxyethylene sorbitan monooleate (20EO). Polyoxyethylene sorbite fatty acid esters include polyoxyethylene sorbite monolaurate (6EO) and polyoxyethylene sorbite tetraolate (40EO). Among polyoxyethylene glycerin fatty acid esters, polyoxyethylene glyceryl monooleate (5E.O.) and polyoxyethylene glyceryl monooleate (15E.
O.). In polyethylene glycol fatty acid esters,
Polyoxyethylene monoisostearate (10E.
O.), polyoxyethylene monooleate (6E.
O.). Polyethylene glycol difatty acid esters include polyoxyethylene diisostearate (8E.
O.), polyoxyethylene diisostearate (12
EO). In polyoxyethylene alkyl ether,
Polyoxyethylene oleyl ether (7EO), polyoxyethylene oleyl ether (10EO). The polyoxyethylene polyoxypropylene alkyl ether is polyoxyethylene (1) polyoxypropylene (4) alkyl ether. For polyoxyethylene castor oil / hardened castor oil, polyoxyethylene castor oil (20EO) and polyoxyethylene hardened castor oil (4
0EO).

In the present invention, one or more nonionic surfactants are used. The HLB value of the nonionic surfactant as a whole is 6 to 13. When the oil composition is used as a cleansing cosmetic, the HLB value is 6
If it is less than 13, it will be difficult to wash it off with water, and if it exceeds 13, the compatibility with oil may be poor. Preferred nonionic surfactants are polyoxyethylene diisostearate (10EO) and polyoxyethylene isostearate (10EO).

The content of the nonionic surfactant is preferably 6.0% (mass percentage) or more, more preferably 7.0% (mass percentage) or more, based on the total amount of the oil composition. If it is less than 6.0% by mass, it becomes difficult to solubilize the oil component in water in which trehalose is dissolved in the case of a cleansing cosmetic. The upper limit is not particularly limited, but is usually 50%
(Mass percentage) or less. In particular, in the case of a cleansing cosmetic, 7.0 to 35% (mass percentage) is preferable.

The field of application of the oil composition of the present invention is not limited. The present invention can be used when it is desired to prevent discoloration or odor of oil containing unsaturated fatty acids. Base for skin external preparation,
It can be used as food, oily detergent and other industrial oils. Depending on the application, necessary components are appropriately compounded in addition to the above essential components.

When used as a cleansing cosmetic, in addition to the above-mentioned components, raw materials commonly used in cosmetics such as polyhydric alcohols, fragrances, antioxidants, ultraviolet absorbers, and skin nourishes are used for the purpose of the present invention. It can be appropriately blended within the range to be achieved. It is also highly useful as a cosmetic for massage and as a bath additive.

[0022]

Next, the present invention will be described more specifically with reference to examples. The present invention is not limited only to the following examples.
The compounding amount is% (mass percentage) based on the total amount.

[Examples 1 to 6, Comparative Examples 1 to 5] Liquid cleansing was prepared according to the formulations shown in Tables 1 and 2, and a test was conducted for stability over time.

(Adjustment method) The oil-soluble raw materials in the composition were uniformly mixed and dissolved, and the aqueous solution was stirred and mixed therein to obtain an oil cleansing cosmetic.

(1) Stability test with time <Judgment of appearance> Samples (liquid cleansing cosmetics of Examples and Comparative Examples) were filled in a glass bottle and charged at 5 ° C, RT and 50 ° C.
The sample was placed in a constant temperature bath at 2 ° C., and the appearance after 2 months was compared with that of the product stored at 5 ° C. for determination. Stability with time under a fluorescent lamp was determined by putting a fluorescent lamp in a showcase, observing the appearance after 3 months, and comparing with the product stored at 5 ° C. The odor stability and appearance after exposure to sunlight were determined by comparing with a product stored at 5 ° C. after irradiation with 100 megajoules. When the appearance did not change as compared with the product stored at 5 ° C., it was judged as 、, when it changed slightly, as Δ, and when the change was large, as X.
The product stored at 5 ° C. had no change in appearance and was evaluated as ○.

<Odor (strength of unpleasant odor)> The sample subjected to the above-mentioned stability test with time was applied to the inside of the upper arm, and the odor was judged by sensory properties. The evaluation of the odor was as follows: ○: no change compared with the product stored at 5 ° C .;
Those that strongly sensed an unpleasant odor were evaluated as x. In addition, the characteristic odor is described. The product stored at 5 ° C had no odor and was evaluated as ○.

[0027]

[Table 1] ---------------------------------------------- -------------- Example 1 2 3 4 ------------------------------ ------------------------------ Olive oil 10.0 10.0 40.0 60.0 Cetyl 2-ethylhexanoate 30.0 30.0 1.5-Liquid paraffin 52.495 52.499- -POE oleyl ether (5EO) 7.0 7.0--POE diisostearic acid (12EO)--45.0 25.0 POE diisostearic acid (8EO)--5.0 10.0 POE isostearic acid (10EO)----Purified water 2.0 2.0 8.0 4.0 Trehalose 0.001 0.005 0.5 0.05 ------------------------------------------------ ------------ Stability over time <Appearance> 5 ℃ ○ ○ ○ ○ 50 ℃ △ ○ ○ ○ Under fluorescent light △ ○ ○ ○ Sun exposure △ ○ ○ ○ <Deodorant> 5 ℃ ○ ○ ○ ○ 50 ℃ × △ ○ ○ Under fluorescent light △ ○ ○ ○ Sun exposure × ○ ○ ○ ---------------------------- --------------------------------

[0028]

[Table 2] ---------------------------------------------- ------------------------- Example 5 Comparative Example 1 2 3 4 5 6 -------------- -------------------------------------------------- ------- Olive oil 30.0 30.0 30.0 30.0 30.0 30.0 30.0 Cetyl 2-ethylhexanoate 20.0 20.0 20.0 20.0 20.0 20.0 20.0 Liquid paraffin 19.95 20.0 19.95 19.95 19.95 19.95 19.95 POE diisostearic acid (12EO) 17.0 17.0 17.0 17.0 17.0 17.0 17.0 POE diisostearic acid (8EO) 2.0 2.0 2.0 2.0 2.0 2.0 2.0 POE isostearic acid (10EO) 6.0 6.0 6.0 6.0 6.0 6.0 6.0 Purified water 5.0 5.0 5.0 5.0 5.0 5.0 5.0 Trehalose 0.05------Ascorbic acid--0.05-- --Sucrose---0.05---Lactose----0.05--Sorbitol-----0.05-Glucose------0.05 ---------------- -------------------------------------------------- ----- Stability over time <Appearance> 5 ℃ ○ ○ ○ ○ ○ ○ ○ 50 ℃ ○ × × × × × Under fluorescent light ○ × × × × × × Sun exposure ○ × × △ △ △ △ <Deodorant> 5 ° C ○ ○ ○ ○ ○ ○ ○ 50 ° C ○ × × × × × × Under fluorescent light ○ × × × × × × Sun exposure ○ × × × × × × -------------------------------------- ---------------------------------

From Table 1, it can be seen that the content of trehalose was 0.005%.
It is preferable that it is above. Table 2 shows that trehalose contributes to stabilization. Substances other than trehalose do not contribute to stabilization.

The following other embodiments will be described. All of them have excellent stability over time and do not cause any problem even if they are stored for a long time.

Example 6 Cleansing oil Jojoba oil 20.0 Macadamia nut oil 15.0 Liquid paraffin 15.0 Cetyl isooctanoate 9.0 POE (20) glyceryl triisostearic acid 20.0 POE (20) glyceryl monoisostearic acid 10.0 Purified water 10.0 Trehalose 1.0

Example 7 Cleansing Oil Teaseed Oil 10.0 Safflower Oil 10.0 Liquid Paraffin 50.0 Methylphenyl Silicone Oil 8.5 POE (15) Oleyl Ether 8.0 POE (20) Sorbitan Laurate 0 POE (30) glyceryl monoisostearate 3.0 glycerin 1.0 dipropylene glycol 2.0 purified water 4.0 trehalose 0.5

Example 8 Cleansing Oil Sunflower Oil 45.0 Avocado Oil 45.0 POE (20) Glyceryl Triisostearic Acid 5.0 POE (10) Glyceryl Monoisostearic Acid 3.8 Purified Water 1.0 Trehalose 0.2

Example 9 Massage Oil Cottonseed Oil 2.0 Rice Bran Oil 5.0 Evening Primrose Oil 3.0 Polydecene 20.0 Liquid Paraffin 50.0 Squalane 6.0 Squalene 1.0 POE (10) Diisostearic Acid 4.0 POE ( 15) Glyceryl monoisostearate 5.0 Purified water 3.6 Trehalose 0.4

Example 10 Oily Bath Almond Oil 5.0 Camellia Oil 5.0 Sazanca Oil 5.0 Liquid Paraffin 45.0 Cyclomethicone 2.5 2-Ethylhexanoic Acid Triglyceride 12.0 POE (12) Diisostearic Acid 12 6.0 POE (20) hydrogenated castor oil 6.0 Purified water 7.0 Trehalose 0.5

[0036]

According to the present invention, by blending trehalose, water and a nonionic surfactant with an oily composition containing an unsaturated fatty acid in the molecule, it is possible to suppress the odor and discoloration over time, and the storage stability. It is possible to provide an oil composition having a high property.
In particular, it is preferably used as a solubilizing oily cleansing cosmetic, a massage cosmetic, and a bathing agent.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme court ゛ (Reference) C11D 3/22 C11D 3/22 (72) Inventor Takeshi Yanagita 2-2-1 Hayabuchi, Tsuzuki-ku, Yokohama, Kanagawa Prefecture F-term in Shiseido Research Center (Shin-Yokohama) (reference) 4C083 AA122 AB051 AC022 AC122 AC132 AC182 AC352 AC402 AC422 AC432 AC442 AD022 AD042 AD152 AD202 AD211 AD212 AD642 BB04 BB11 CC23 CC25 DD23 DD30 EE01 4H003 AC08 DA02 EB02 EB02 EB02EB09

Claims (6)

[Claims] 1. An oil composition comprising an oil containing an unsaturated fatty acid, trehalose, water and a nonionic surfactant. 2. The trehalose content is 0.005 to 1.0% (mass percentage) based on the total amount of the oil composition.
An oil composition as described. 3. The water content is based on the total amount of the oily composition.
3. The oil composition according to claim 1, wherein the amount is 0.1 to 10.0% (percent by mass). 4. The oil composition according to claim 1, wherein the oil composition is a cleaning composition. 5. The oily composition according to claim 4, wherein the cleaning composition is a cleansing cosmetic. 6. A method for stabilizing an oily composition, wherein trehalose, water and a nonionic surfactant are contained in an oil containing an unsaturated fatty acid.