JP3308321B2 - Oil-in-water emulsion - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil-in-water emulsion, and more particularly, to an oil-in-water emulsion which can be produced without using a surfactant.

[0002]

2. Description of the Related Art Some cosmetics and medicines, such as emulsions, creams and ointments, have an oil-in-water emulsion containing an aqueous phase component and an oil phase component as main components. Conventionally,
In the production of these oil-in-water emulsions, surfactants such as sorbitan fatty acid esters / polyethylene glycol fatty acid esters and polyoxyethylene castor oil are generally used as emulsifiers.

[0003] However, conventionally used surfactants are strongly irritating to the skin, and many consumers have anxiety. In addition, oil-in-water emulsions using these surfactants are unstable over time or have a sticky feeling of use and are thus not organoleptically desirable, and further have problems such as poor water resistance. For this reason, the amount of the surfactant used has been reduced as much as possible, and emulsions not using the surfactant have been developed.

For example, instead of a surfactant, a clay mineral (JP-A-56-150007, JP-A-57-1681) is used.
No. 2, JP-B-64-3529, JP-A-58-1245.
No. 35), silicone oil (JP-A-61-66527)
), Sucrose fatty acid esters and polyhydric alcohols (JP-A-55-84532), glycyrrhizin (JP-A-57-84532).
No. 62214) is disclosed as an emulsifier or an emulsifier.

[0005]

However, the above-mentioned emulsions which do not use a surfactant have been able to obtain a certain effect, but it is very difficult to obtain a stable emulsion, and it is difficult to feel or feel safe. Many of them do not sufficiently solve the problems of surfactants, such as the above problems.

The present invention has been made from such a viewpoint. It does not use a surfactant as an emulsifier, is excellent in stability over time, safety, and water resistance, has no stickiness on a functional surface, and has good elongation. It is an object to provide a light and mild oil-in-water emulsion.

[0007]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems, and as a result, have found that an aqueous phase component containing a specific amount of sodium polyacrylate, an oil phase component, and an emulsifying aid. It has been found that an oil-in-water emulsion having improved stability over time, safety, water resistance, and functional performance can be obtained when blended in a certain range of proportions, thereby completing the present invention.

That is, according to the present invention, an aqueous phase component of 48 to 99.99% by weight based on the total weight of the emulsion;
50% by weight of oil phase, an oil-in-water emulsion consisting 0.01-2.0 wt% of co-emulsifier, the aqueous phase component, 0 at least sodium polyacrylate relative to the emulsion total amount 0.03% by weight or more and 0.03% by weight or more.
An oil-in-water emulsion characterized in that it is contained in an amount not exceeding 3% by weight and that the emulsifying aid is selected from higher alcohols, higher fatty acids and phospholipids.

Hereinafter, the present invention will be described in detail. The oil-in-water emulsion of the present invention contains at least an aqueous phase component, an oil phase component, and an emulsification aid. Hereinafter, these components and the oil-in-water emulsion will be described separately. <1> Aqueous phase component The aqueous phase component blended in the oil-in-water emulsion of the present invention contains water as a main component, and at least 0.03% by weight or more and not more than 0.3% by weight based on the total amount of the emulsion. Sodium acrylate, and may further contain a polyhydric alcohol such as glycerin, 1,3-butylene glycol, and propylene glycol, and a thickener such as a carboxyvinyl polymer.

When the amount of sodium polyacrylate is 0.0
If the amount is less than 3% by weight, the hardness of the oil-in-water emulsion is low, and the emulsion may be separated when left for a long time. If the amount is more than 0.3% by weight, safety may not be preferable. In addition, these aqueous phase components are compounded in the range of 48 to 99.99% by weight based on the total amount of the oil-in-water emulsion. <2> Oil Phase Component The oil phase component blended in the oil-in-water emulsion of the present invention includes vegetable oils such as olive oil, corn oil, jojoba oil, etc., animal oils such as synthetic spermaceti, lanolin, beeswax, squalane,
Examples include all oils specified in cosmetics standards, such as liquid paraffin, mineral oil such as petrolatum, silicone oil, etc., and these are the main components.

The content of these oil phase components is in the range of 1 to 50% by weight based on the total amount of the oil-in-water emulsion, and one or a combination of two or more thereof is blended. When the oil phase component is less than 1% by weight, it becomes difficult to recognize an emulsion as an appearance,
If it exceeds 50% by weight, emulsification becomes difficult and an oil-in-water emulsion may not be obtained. <3> Emulsifying Aids Examples of emulsifying aids to be incorporated in the oil-in-water emulsion of the present invention include higher alcohols such as cetanol and stearyl alcohol, higher fatty acids such as myristic acid, stearic acid and palmitic acid, and phospholipids such as lecithin. And the like.

These emulsifying aids may be used alone or in combination of two or more in the range of 0.01 to 2.0% by weight based on the total amount of the oil-in-water emulsion. When the amount of the emulsifying aid is less than 0.01% by weight, it is difficult to form an emulsion. When the amount exceeds 2.0% by weight, the structure of the external phase proceeds after standing for a long time, and a remarkable increase in hardness is observed. Sometimes it is not possible to take the cream by hand. <4> Oil-in-water emulsion of the present invention Each of the components of the oil-in-water emulsion of the present invention may include, as other components, one or more components used in ordinary general cosmetics. It can be blended in combinations of more than one kind. Such components include, for example, fragrances, pigments, preservatives, antioxidants, anti-inflammatory agents, ultraviolet absorbers, ultraviolet reflectors, pH adjusters, and the like.
Further, if necessary, various medicinal ingredients such as hyaluronic acid, allantoin, vitamins, placenta extract, etc. can be added.

The oil-in-water emulsion of the present invention is a conventional oil-in-water emulsion in which the oil phase component and the emulsifying aid previously heated and dissolved are gradually added to the heated aqueous phase component and dispersed and emulsified by a stirrer. It is manufactured in the same manner as described above.

[0014]

Embodiments of the present invention will be described below.

[0015]

Examples 1 to 6 Creams Examples of creamy cosmetics will be described as the oil-in-water emulsion of the present invention. <Production method> The creams of Examples 1 to 6 and the oil-in-water emulsions of Comparative Examples 2 to 6, in which the blending amounts of the respective main components were out of the formulation of the emulsion of the present invention, were produced. Further, a cream of Comparative Example 1 was produced as a cream containing a conventional surfactant.

Using the components shown in Table 1, the cream was produced by dispersing and emulsifying with a stirrer while gradually adding the oil phase component and the emulsifying aid previously heated and dissolved to the heated aqueous phase component. .

[0017]

[Table 1] In addition, (-) in Table 1 shows that the test was not performed. <Evaluation> The oil-in-water creams of each of the above Examples and Comparative Examples were evaluated for safety, actual use test concerning usability, water resistance, stability test, emulsified state and appearance by the following methods. (1) Safety The creams of Examples 1 and 2 and Comparative Examples 1 and 2 were used for 50 women panelists aged 24 to 58 years old in place of the creams usually used for two weeks each in the morning and evening. The subject was subjectively evaluated and the skin condition before and after use was objectively evaluated.

The evaluation was made by comprehensively judging items such as burning, tingling, redness, spouting, and rustling. The number of those cases was expressed as a result when these symptoms appeared as positive. (2) Usability In the same manner as described above, 50 female panelists were asked to use the creams of Example 1 and Comparative Example 1 in the morning and evening for 2 weeks each in place of the creams usually used, and sensory evaluation Was done.

The evaluation was made by comprehensively judging items such as spreadability, greasyness and stickiness according to the following criteria.
The average value of the names was expressed as a result. Good: 10 points Neither can be said: 5 points Bad: 0 points (3) Water resistance For 20 female panelists, a 0.1 g sample of each example and comparative example is uniformly applied to the forearm and then showered. It was applied to the coated part for 5 minutes, and wiped lightly with a towel.

[0020] Remaining on the skin: ○ Run off: × (4) Stability 10 samples each of the oil-in-water creams of all Examples and Comparative Examples were placed in a constant temperature room at 20 ° C, 40 ° C, and 50 ° C. After standing for 3 months, hardness and separation were visually observed and evaluated according to the following criteria.

Good: ○ Separation or increase in hardness: × (5) Emulsified state The oil-in-water type creams of all Examples and Comparative Examples were evaluated for good or bad emulsified state immediately after preparation using the naked eye and a microscope.

Good: で き な い Cannot be emulsified: × The results of the above evaluations are shown in the lower column of Table 1. In addition, as a result of the safety test, the cream of Comparative Example 2 showed 5 papules.
It was seen in 8 out of 0 people. On the other hand, in the cream of the example,
The papules occurred in 1 out of 50 people.

From the above results, the oil-in-water cream of the present invention has excellent emulsified state, good appearance, safety, low elongation, excellent non-stickiness, excellent water resistance, and stability over time. It turns out that it is also excellent.

[0024]

Example 7 Emulsion Next, an example of an emulsion as an oil-in-water emulsion of the present invention will be described.

The aqueous phase components shown in Table 2A are heated, and the components of B which have been heated and dissolved in advance are gradually added thereto, and dispersed and emulsified with a stirrer.

[0026]

[Table 2]

[0027]

The oil-in-water emulsion according to the present invention comprises:
It is excellent in stability over time, water resistance and sensory surface, and is also excellent in safety because no surfactant is used, and is expected to be applied to cosmetics and pharmaceuticals.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI B01J 13/00 B01J 13/00 A (72) Inventor Shinya Okabe 27-1 Takashimadai, Kanagawa-ku, Kanagawa-ku, Yokohama-shi, Kanagawa Prefecture (56) References JP-A-62-54741 (JP, A) U.S. Pat. No. 5,679,740 (US, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) A61K 7/00-7 / 50 B01J 13/00 B01F 17/00-17/56

Claims (1)

(57) [Claims] (1) 48 to 9 based on the total amount of the emulsion.
8.99% by weight of an aqueous phase component, and 1 to 50% by weight of the oil phase component, essentially consisting of 0.01 to 2.0 wt% of co-emulsifier
An oil-in-water emulsion containing no surfactant , wherein the aqueous phase component contains at least sodium polyacrylate in an amount of 0.03% by weight or more based on the total weight of the emulsion, and exceeds 0.3% by weight. An oil-in-water emulsion, wherein the emulsification aid is selected from higher alcohols, higher fatty acids, and phospholipids.