JPS6011883B2 - W/O type cosmetics - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel cosmetic composition, and more particularly to a W-O type cosmetic composition that is stable over a wide temperature range.

In general, W/O type cosmetics have quality advantages such as higher microbial resistance and easier retention of water contained in cosmetics than ○W type cosmetics. It has many advantages, such as leaving an oil film with low moisture permeability on the skin, protecting the skin from drying out for a long time, and reducing re-emulsification during bathing. However, the conventional W-O type emulsion has the following drawbacks. In other words, the breaking mechanism of an emulsion generally consists of drainage due to coagulation of particles, followed by coalescence of the particles, but since the coagulation rate is much faster than the coalescence rate, the initial Destruction prevention consists in preventing this agglomeration. Since the continuous phase in the W/O type emulsion is water, the water is separated by drainage due to coagulation, but since the water is dispersed, a small amount of drainage does not actually pose a problem in terms of quality. There are many cases. On the other hand, W
Since the continuous phase in the /O type emulsion is oil, the drained liquid is also oil, so even if a small amount of oil separates, it remains without being dispersed, resulting in a loss of appearance and commercial value.
This property makes it difficult to obtain W/O emulsions that are stable over a wide temperature range, and since there was no emulsifier that could solve this problem, W/O emulsions are less effective than ○/W emulsions. Despite its excellent properties, the reality is that it is not widely used as a nutritious food.

Currently, Wno-O type cosmetics include emulsifiers with low HLB, such as lanolin derivatives, sorbitan monofatty acid ester,
Using sorbitan difatty acid ester, sorbitan trifatty acid ester, glycerin monofatty acid ester, glycerin difatty acid ester, polyoxyethylene alkyl ether, etc. as an emulsifier, cleansing cream,
It is commercially available in the form of milky lotion, nutritional cream, etc.

However, although these cosmetics are stable around room temperature, they quickly separate under high or low temperature conditions, lack stability over a wide temperature range, and are inferior to ○/W type cosmetics for the same purpose. It was of inferior quality. Therefore, the present inventors aimed to improve the drawbacks of W/O type cosmetics.As a result of intensive research, the following general formula (1) (wherein, there are no 2 on average out of 6 6 are solid saturated or unsaturated acyl groups with no carbon number of 12, and the rest are hydrogen atoms, n, n2, n3, mountain, n5 and the ratio are 0, respectively.
99.5 to 65 parts by weight of a polyoxyethylene sorbitol fatty acid ester represented by an integer of 0 to 10, and the average of the sum is 6 to 10, and 0.5 parts by weight of a polyvalent metal salt of a fatty acid. If an emulsifier composition containing 35 parts by weight or more is used, a stable W/O type emulsion system can be obtained over a wide temperature range, and if this is applied to cosmetics, extremely excellent W/O type cosmetics can be obtained. He discovered this and completed the invention.

That is, the present invention provides a W/O type cosmetic comprising three components: 0.1 to 2% by weight of an emulsifier composition, 15 to 8% by weight of an oil base, and the remainder of water. This is what we provide.

Preferred examples of the polyoxyethylene sorbitol fatty acid ester (1) in the emulsifier composition include polyoxyethylene sorbitol trioleate, polyoxyethylene [71 sorbitol tetraoleate,
Polyoxyethylene'8) Sorbitol Heptaoleate, Polyoxyethylene 00 Sorbitol Hexaoleate, Polyoxyethylene {61 Sorbitol Tristearate, Polyoxyethylene (7) Sorbitol Tetrastearate Polyoxyethylene {10 Sorbitol Hexastearate etc.

In addition, as the polyvalent metal salt of a fatty acid, a fatty acid having a saturated or unsaturated alkyl group having 11 to 17 carbon atoms is preferable, and examples of the salt thereof include calcium, magnesium, zinc, and aluminum salts. Among these, aluminum salts are particularly preferred.

The polyvalent metal salt may be mono-, di- or tri-isomer, but mono-isomer is most preferred. These polyvalent metal salts of fatty acids are
Those synthesized in advance by metathesis method or direct method may be used, but water-soluble polyvalent metal salts such as calcium chloride, magnesium chloride, magnesium sulfate, zinc chloride,
It may also be produced by substitution reaction of aluminum chloride, aluminum sulfate, alum, etc. with a fatty acid monovalent acid. Preferred polyvalent metal salts of fatty acids include, for example, aluminum monostearate, aluminum distearate, calcium monostearate, aluminum monooleate,
Examples include aluminum mono'hyremitate and aluminum monolaurate. Cosmetic oil bases represented by [B] include squalane, paraffin oil, hydrocarbons such as ceresin; waxes such as beeswax, spermaceti, and carnauba wax; natural animal and vegetable oils and fats such as olive oil, camellia oil, and lanolin; carbon number Examples include fatty acids having 10 to 20 carbon atoms, higher alcohols having 10 to 20 carbon atoms, their esters, silicone oil, etc. The W/O type cosmetics of the present invention include wind emulsifier compositions, {B-no. In addition to the three essential components of the cosmetic oil base and water, other surfactants, viscosity modifiers, medicinal agents, wetting agents, preservatives, stabilizers, etc. may be added as necessary.

As viscosity modifiers, synthetic polymers such as polyvinyl alcohol, hydroxyvinyl polymer, hydroxymethylcellulose, polyvinylpyrrolidone, hydroxyethylcellulose, and methylcellulose, natural gums such as gelatin and gum tragacanth, and ethanol and inpropyl alcohol are used. Alcohols such as: Medicinal agents include bactericidal agents, anti-inflammatory agents, vitamins, etc. Humectants include propylene glycol, glycerin, 1,3-butyresoglycol, sodium pyrrolidone carboxylate, sorbitol, etc.; Preservatives include Tyl paraoxybenzoate, ethyl paraoxybenzoate, propyl paraoxybenzoate, butyl paraoxybenzoate, benzoic acid, sodium benzoate, sorbic acid, potassium sorbate, phenoxychetanol, etc.; stabilizers include magnesium sulfate, sodium chloride,
Examples include barium sulfate, magnesium chloride, sodium sulfate, and the like.

The W/O type cosmetic of the present invention is prepared by adding 0.1 to 20% by weight of the harmful emulsifier composition, preferably 0.5 to 20% by weight, using a conventional method.
7% by weight and {B} cosmetic oil base of 15 to 8% by weight, preferably 20 to 7% by weight, and appropriate amounts of other surfactants, viscosity modifiers, medicinal agents, wetting agent,
Manufactured by adding preservatives and stabilizers, and adjusting the remainder with water from [C}.

If the blending ratio of (■) is less than 0.1%, it will not be possible to stabilize the emulsion, and if it exceeds 20%, the cream will take on a gel structure, resulting in a marked increase in the viscosity of the cream. Not desirable as a material.

In addition, if the blending ratio of [B} is 15% or less, a cream-like product can be obtained by increasing the blending ratio to 10 to 20%, but with such a product, when applied to the skin, Since the resistance of the remaining oil base to moisture permeation is reduced, the original purpose of cosmetics, which is to protect the skin, cannot be achieved, which is not preferable.

Moreover, if it exceeds 80%, the feeling of oily stickiness becomes extremely strong during use, and the advantage of using emulsified oil, that is, the reduction of oily stickiness, is not achieved, which is also undesirable.

In addition, in the sail emulsifier composition, the polyoxyethylene fatty acid ester of formula (1) is contained in an amount of 99.5 to 65% by weight, especially 9
9 None, 8 Low weight %, fatty acid polyvalent metal salt 0.5 None, 35 weight %, especially 1 None, 20 weight % are preferable, and when it is out of this range, emulsion stability This is not preferable because it reduces the

The cosmetics obtained in this way are mainly salmon ingredients for the purpose of protecting the skin, and can be used in all forms of cosmetics suitable for this purpose, such as hand creams, cleansing creams, milky lotions, and cold creams. , vanishing cream,
It can be a hair cream and a foundation cream.

Examples will be further described below. Example 1 The following composition was heated to 70° C. and mixed to produce an ikeboko material.

After production, the emulsified form was examined by electric conductivity, emulsion particle size by microscope, and stability by the state of separation after being left at each temperature for 15 days. The results are shown in Table 1. (Cosmetic composition) Cosmetic oil base (olive oil)
3 wt% emulsifier
5 natural fragrances
0.2 water 64
．． 8 Table 1 (Note) Compound (1) Tripolyoxyethylene (average 7 moles added) Sorbitol oleate ester (average 4.1 esters) Compound (b): Monoaluminum stearate stability evaluation criteria : - No separation. Slight separation of oil. Separation into two phases: cream phase and pseudo-liquid phase (oil). Separation into three phases: cream phase, drainage phase (oil), and combined phase (moisture). Cream The phase disappears and separates into two phases: pseudo-liquid phase (oil) and combined phase (moisture) × Coagulation Example 2 Polyoxyethylene sorbitol fatty acid ester (1)
and fatty acid salt (D) in a ratio of 84:16, and the emulsifier type, emulsion particle size, and stability were examined for the following composition.

The results are shown in Table 2. Note that the measurement method and evaluation criteria are the same as in Example 1, but when the emulsion type is ○NOW, the water content and oil content in the evaluation criteria are reversed.

(Composition) Liquid paraffin 3 parts emulsifier 5 parts water
Part 65 Table 2 Example 3 The emulsification type, particle size and Stability was investigated for the following compositions.

The results are shown in Table 3. Note that the measurement method and evaluation criteria are the same as in Example 1, but when the emulsion type is ◯W type, the water content and oil content in the evaluation criteria are reversed.

(Composition) Liquid paraffin 3 parts emulsifier 5 parts water
65 parts Table 3 Example 4 Cleansing cream (raw materials) ■ Liquid paraffin 25 parts ■
Olive oil 10■ dense.

3■ Polyoxyethylene'
7) Sorbitol oleate ester (average esterification 3
．． 5) 5■ Aluminum monostearate 0.75■ Butyl paraoxybenzoate
0.1■ Methyl paraoxybenzoate
0.1 ■ Fragrance
0.2 ■ Water 56 ■ Magnesium sulfate
0.1 (manufacturing method)■～■75oo
Heat to 7,000℃, and separately heat ① and ② to 7000℃.

Add the mixture of (1) to (2) to the mixture of (2) and (2) while stirring, cool to 40°C, and then add (2). After cooling to room temperature, fill it into a container and use it as a product. (Effect) The cleansing cream produced according to this example was used as a conventional W/O with the following composition.
A comparison was made with a type cleansing cream in terms of temperature stability and properties as a cosmetic.

W/O type cleansing cream (comparison product) Liquid paraffin 25 parts Olive oil
10 dense wax
3 lanolin alcohol
5 aluminum monostearate 0.7
5 Butyl oxybenzoate 0.1 Methyl oxybenzoate 0.1 Fragrance
0.2 water
56 Magnesium Sulfate
0.1 ■ Temperature stability -150
The cleansing cream was left for 15 days under the following temperature conditions: 0°C, -5°C, 20°C, 30°C, and 5000°C.

The cleansing cream obtained in this example was stable at any temperature. On the other hand, the comparative product was stable at -5℃, 2000 and 30oo, but
Under q0 conditions, oil was separated in one day, and under 115 qo conditions, freeze fracture occurred in 3 days. ■ A sensory test was conducted using a blind bear test method with a panel of 6 members dedicated to usability.

The results are shown in Tables 4 and 5. The evaluation criteria are as follows. Evaluation criteria: Cream A is very good compared to Cream B 12 Cream A is slightly better than Cream B 11 Cream A is no different than Cream B 0 Cream A is better than Cream B
-1 Cream A is very bad compared to Cream B -2 Table 4 Cream A is the invention product of this example,
Cream B is a comparison product.

(In the table, the numbers indicate the number of people who evaluated) Table 5 Cream A is a comparative product, Cream B is a product of the present invention according to this example.

(In the table, the numbers indicate the number of people who evaluated) From the above results, the W/O type cleansing cream of the present invention spreads better than the conventional W/O type cleansing cream, has less stickiness, and is excellent as a cosmetic. It became clear that the product had a feeling of use.

Example 6 Hand cream (raw materials) ■ Liquid paraffin 5 parts ■ Paraffin wax 5 ■ Cetyl alcohol
3■ Lanolin alcohol
1■ Liquid lanolin
2 ■ Polyoxyethylene skin sorbitol oleate ester (average esterification 5) 4 ■ Magnesium monostearate 0.5 ■ Fragrance
0.2 country■ Solpitol
5 ■ Water 74 ■ Magnesium sulfate 0.1 (manufacturing method) Heat ■ ~ ■ to 75 ~ 8000, and separately heat ■ ~ ■ to 7
Heat to 0-75o0.

Claims (1)

[Claims] 1 (A) General formula (I), ▲There are mathematical formulas, chemical formulas, tables, etc.▼ (In the formula, an average of 2 to 6 of the 6 Xs have a carbon number of 12
to 20 saturated or unsaturated acyl groups, the rest are hydrogen atoms, n_1, n_2, n_3, n_4, n
_5 and n_6 are each an integer from 0 to 10, and the average sum of them is 6 to 10) Polyoxyethylene sorbitol fatty acid ester 99
．． (B) 0.5 to 10% by weight of an emulsifier composition comprising 5 to 65 parts by weight and 1 to 35 parts by weight of a polyvalent metal salt of a fatty acid; (B) 20 to 80% by weight of a cosmetic oil base;
(C) A W/O type cosmetic consisting of three components, the remainder being water. 2. W according to claim 1, wherein the fatty acid polyvalent metal salt of (A) is a calcium salt, magnesium salt, zinc salt or aluminum salt of a saturated or unsaturated C11 to C17 fatty acid. /O-type decorative material. 3. The W/O type decorative material according to claim 2, wherein the polyvalent metal salt (A) is a monosalt.