JPH0532520A - Water-in-oil type emulsion composition - Google Patents

Abstract

PURPOSE:To obtain a water-in-oil type emulsion composition comprising silicone oil containing a methylphenylpolysiloxane at a prescribed amount, a dextrin fatty acid ester, a specific polyoxyalkylene-modified dimethylpolysiloxane and water. CONSTITUTION:A water-in-oil type emulsion composition comprising silicone oil (e.g. dimethylpolysiloxane of 15-50wt.%) having 5-25wt.% methylphenylpolysiloxane content, a dextrin fatty acid ester (e.g. dextrin palmitic acid ester of 0.3-6wt.%), a polyoxyalkyl-modified methylpolysiloxane (0.1-6wt.%) expressed by the formula [R is H or alkyl; (x) is 200-670; (y) is 1-25; (z) is 1-5; (m) is 8-110; (n) is 0-50] and water. The composition has excellent storage stability and is free from excess sticky feeling and oily feeling when used and the composition gives a refreshing use feeling and simultaneously has excellent water resistance and perspiration resistance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved water-in-oil emulsion composition, and more particularly, to a water-in-oil emulsion composition having excellent storage stability, feeling of use, and water / sweat resistance. Regarding

[0002]

2. Description of the Related Art Conventionally, water-in-oil type emulsion systems have been used in various products. In particular, it has been favorably used for hand creams, makeup cosmetics, sun care cosmetics, hair cosmetics, etc., which are required to have water repellency, water resistance and sweat resistance. On the other hand, it has been recognized that silicone oil is an important oil for water-in-oil emulsion cosmetics because it has a smooth feeling of use and excellent water repellency.

[0003]

However, silicone oil has the drawback that it is very difficult to obtain a stable water-in-oil type emulsion system, and although silicone oil is strongly desired, A water-in-oil type emulsion composition containing a large amount of oil and having excellent storage stability enough to withstand commercial use has not been obtained. Further, since mechanical stability is not sufficient, there is a problem in water resistance and sweat resistance after application.

Therefore, the present invention provides storage stability, usability,
It is an object of the present invention to provide a water-in-oil type emulsion composition having excellent water resistance and sweat resistance.

[0005]

The present invention provides a silicone oil having a methylphenylpolysiloxane content of 5 to 25% by weight, a dextrin fatty acid ester, and the following general formula:

[Chemical 2] [In the Formula, R is a hydrogen atom or a C1-C5 alkyl group, x is 200-670, y is 1-25, z is 1-5, m is 8-110. Yes, n is 0
The water-in-oil type emulsion composition is characterized by containing polyoxyalkylene-modified dimethylpolysiloxane represented by the formula [50] and water.

The structure of the present invention will be described in detail below. The silicone oil used in the present invention may be any one commonly used in medicines, cosmetics and the like, and examples thereof include dimethylpolysiloxane, dimethylcyclopolysiloxane and methylphenylpolysiloxane. Furthermore, 5 to 25% by weight (hereinafter simply referred to as%
Is used). That is, if this is less than 5%, the appearance will be rough.
On the contrary, if it exceeds 25%, the oily feeling becomes strong.

Further, the content of the silicone oil is preferably 15 to 50% with respect to the total weight of the composition.
If it is less than 50%, it becomes difficult to emulsify, and if it exceeds 50%, it is not preferable because the finish has a strong oily feeling.

Further, the water-in-oil type emulsion composition of the present invention may contain a conventional hydrocarbon-based oily base within a range that does not affect the effect. Examples include liquid paraffin, squalane, hydrocarbons of petrolatum sugar, waxes such as whale wax and carnauba wax, octyldodecyl myristate, ester oils such as neopentyl glycol dioctanoate, vegetable oils such as olive oil and macadamia nut oil. You can

The dextrin fatty acid ester used in the present invention is an ester compound of a fatty acid having 8 to 24 carbon atoms and a dextrin having an average degree of polymerization of 10 to 50, and the degree of ester substitution is 0. 5
The above is preferable. For example, dextrin palmitate, dextrin stearate, dextrin palmitate,
Examples thereof include ethyl dextrin oleate and dextrin isostearic acid ester, which may be used alone or in combination of two or more kinds.

The content of the dextrin fatty acid ester is preferably 0.3 to 6% with respect to the total weight of the composition,
If it is less than 0.3%, the water resistance is lowered, while if it exceeds 6%, the viscosity of the entire system is remarkably increased, and the spreadability during use is poor, such being undesirable.

The polyoxyalkylene-modified dimethylpolysiloxane used in the present invention is represented by the above general formula, and any one of these may be used alone or in combination. The content of this polyoxyalkylene-modified dimethylpolysiloxane is preferably 0.1 to 6% with respect to the total weight of the composition. That is,
This is because if it is less than 0.1%, emulsification becomes difficult, and if it exceeds 6%, storage stability decreases.

The above-described water-in-oil type emulsion composition of the present invention has excellent storage stability, does not have excessive stickiness or oiliness at the time of use, gives a refreshing feeling of use, and is resistant to water and sweat. It is also excellent in It is also apparent from the examples described later that the excellent properties are due to the action and effect of the combined use of methylphenylpolysiloxane, dextrin fatty acid ester and polyoxyalkylene-modified dimethylpolysiloxane.

In the water-in-oil type emulsion composition of the present invention, in addition to the above essential constituents, a moisturizer, a fragrance, an ultraviolet absorber, an antiseptic, an antioxidant and a pH adjuster may be added, if necessary. , Thickeners, dyes, pigments and the like can be appropriately added within a range that does not impair the effects of the present invention.

[0014]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited thereto. In addition, the blending amount (%) in this example means% by weight. The methods of the storage stability test, the water / sweat resistance test, and the sensory property test described in the examples are as follows.

(1) Storage stability test A sample was placed in a constant temperature bath at 45 ° C. and observed for an emulsified state and appearance after standing for 10 days. When an abnormality was observed (when oil was separated, particles became coarse). If the abnormality is observed after leaving for 1 month, it is indicated by △. If the abnormality is observed after leaving for 3 months, it is indicated by ○, and if there is no abnormality after leaving for 3 months (When the emulsified state is uniform and a homogeneous emulsion is formed), it is considered to be good and is represented by ⊚.

(2) Water resistance / sweat resistance test A practical test (20 subjects) on the beach was conducted, and the test result was "it is difficult to drop against water and sweat" for the water resistance / sweat resistance test item. The number of respondents is shown.

(3) Sensory Property Test Twenty professional inspectors conducted a test once a day for three consecutive days, and answered a questionnaire regarding the following test items. Test item: Evaluation result Texture: Number of respondents who answered “texture is fine” Stickiness: Number of respondents who did not “feel sticky” Oily feeling: Number of respondents who did not “feel oily”

Examples 1 to 5 and Comparative Examples 1 and 2 W / O type creams having the compositions shown in Table 1 and Table 2 were prepared and the above-mentioned tests were carried out.

[0019]

[Table 1]

[0020]

[Table 2]

(1) Preparation method Each of (A) and (B) was uniformly dissolved at about 70 ° C., (B) was added to (A) with stirring to emulsify and disperse, and then cooled to about 30 ° C. To prepare.

(2) Characteristics Table 1 shows the results of testing the above-mentioned various characteristics of each example and comparative example.
And shown in the lower column of Table 2. As shown in this table, Examples 1 to 5 of the present invention were more excellent in usability than Comparative Examples 1 and 2.

Example 6, Comparative Example 3 A sunscreen having the composition shown in Table 3 was prepared by the preparation method according to Example 1.

[0024]

[Table 3]

Comparative Example 3 in which R is a hydrogen atom, x is 15 to 35, y is 1 to 5, z is 3, m is 8 to 17, and n is 0 is used as the polyoxyalkylene-modified dimethylpolysiloxane. Was inferior to Example 6 in storage stability and water / sweat resistance.

Example 7 A hand cream having the composition shown in Table 4 was prepared by the preparation method according to Example 1.

[0027]

[Table 4]

In a sensory characteristic test by 20 test subjects, 19 people answered that the feeling of use of the product of Example 7 was refreshing. The hand cream thus obtained was a W / O type emulsion, had a fine appearance, good water resistance, and was extremely stable even when stored in a room at 45 ° C. for 3 months.

[0029]

As described above, the water-in-oil type emulsion composition of the present invention is excellent in storage stability, has no excessive stickiness or oiliness at the time of use, and gives a refreshing feeling of use, It has the property of being excellent in water resistance and sweat resistance.

Claims (1)

Claims: 1. The content of methylphenylpolysiloxane is 5.
Up to 25% by weight of silicon oil, dextrin fatty acid ester, and the following general formula: [In the Formula, R is a hydrogen atom or a C1-C5 alkyl group, x is 200-670, y is 1-25, z is 1-5, m is 8-110. Yes, n is 0
The water-in-oil type emulsion composition is characterized by comprising a polyoxyalkylene-modified dimethylpolysiloxane represented by the formula: 50 and water.