JPH04128209A - Skin water repellent - Google Patents

Abstract

PURPOSE:To obtain a skin water repellent excellent in water repellency and persistence thereof and further in preventive effects on hand roughening without stickiness by blending a water repellent-treated aerosol silica with a silicone oil. CONSTITUTION:A skin water repellent is obtained by blending (A) a water repellent-treated aerosol silica prepared by hydrophobizing treatment of aerosol silica having preferably >=100m<2>/g specific surface area with, e.g. a trimethylsilylating agent and (B) a silicone oil. Both the ingredients are blended in amounts of preferably 1-40wt.% ingredient (A) and 30-99wt.% ingredient (B) expressed in terms of amounts after volatilizing volatile ingredients. The aforementioned water repellent is excellent in water repellency, especially persistence thereof and has dry touch without any stickiness or sense of incompatibility. Since water repellency-protecting effects are not lost even after continuing kitchen work for a long period, the objective skin water repellent useful as a sun oil or skin protective cream ointment, etc., for surfers or kitchen work, etc., is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a skin water repellent. More specifically, the present invention relates to a skin water repellent that has particularly excellent water repellency and durability, and is also excellent in preventing rough hands.

[Prior Art] Conventionally, in compositions such as sun oil that impart water repellency to the skin by applying oil to the skin, problems have arisen in that the water repellency does not last long and the composition is sticky. In order to improve this point, conventional efforts have been made to incorporate volatile oils or silicone resins.

[Problems to be solved by the invention] Problems of the prior art However, when a volatile oil is added, stickiness is eliminated, but the sustainability of water repellency is not improved, and when a silicone resin is added, Although the water repellency improved, the durability of the water repellency was not sufficient.

Purpose of the Invention The present inventors have conducted intensive studies on improving the sustainability of water repellency and eliminating stickiness. As a result, a composition containing water-repellent treated fumed silica and silicone oil has no stickiness and maintains water repellency. The inventors discovered that this material also has excellent properties, leading to the present invention.

[Means for Solving the Problems] That is, the present invention is a skin water repellent characterized by blending water-repellent treated fumed silica and silicone oil.

The configuration of the present invention will be explained in detail below.

It is preferable that the water-repellent fumed silica blended into the skin water repellent of the present invention be in the form of a mist and have a specific surface area of 100 m2/g or more. Since fumed silica is hydrophilic, it requires hydrophobic treatment. Any method may be used for the hydrophobization treatment, but a method that does not cause agglomeration of the powder is desirable. As a specific method, a common method is to treat atomized silica with a trimethylsilylation agent. Examples of the trimethylsilylation agent include silazane such as hexamethyldisilazane, rollosilane such as trimethylchlorosilane, and alkoxysilane such as dimethyljethoxysilane. A commercially available water-repellent fumed silica is Tulco's Taranox 500.

The amount of the water-repellent embedded silica used in the skin water-repellent agent of the present invention is preferably 1 to 40% by weight after the volatile components have been volatilized. If the amount is less than 1% by weight, sufficient water repellency cannot be maintained. If it exceeds 40% by weight, the skin becomes whitish and the composition hardens into a resinous state, which is not preferable.

The silicone oils to be blended in the present invention include linear polysiloxanes such as dimethylpolysiloxane, methylphenylpolysiloxane, and methylhydrogenpolysiloxane;
Examples include cyclic polysiloxanes such as tetramethyltetrahydrodiene polysiloxane, silicone resins and silicone rubbers that can form a three-dimensional network structure. The blended amount of silicone oil is 30 to 9 when volatile components are volatilized.
9% by weight is desirable. If it is less than 30% by weight, it is not preferable because it does not give a rough feel.

The skin water repellent of the present invention is in the form of an oil or a jelly.

In addition, the skin water repellent of the present invention may contain ingredients commonly used in cosmetics within a range that does not impair the effects of the present invention. For example, the interface of petrolatum, higher fatty acids, higher alcohols, squalane, liquid paraffin, ester oils, triglycerides, volatile hydrocarbon oils, volatile silicone oils, oils such as fluorocarbons, cationic activators, anionic activators, nonionic activators, etc. Examples include activators, drugs such as vitamin E1 and vitamin E acetate, ultraviolet absorbers, preservatives, fragrances, water, LPG, and dimethyl ether.

The skin water repellent of the present invention has various uses, including sun oil,
Examples include skin protection creams and ointments for surfers and water workers.

The skin water repellent of the present invention may be in the form of a tube, bottle, spray, etc.

[Effects of the Invention] The skin water repellent of the present invention has excellent durability and resistance, and has a smooth feel, so when used as sun oil, for example, seawater turns into round water droplets when it comes out of the sea. Since you roll over and fall, your body gets dry quickly and you don't need to dry yourself with a towel, and it also has the advantage that you won't feel cold because your body won't get wet. Furthermore, when used as a skin protection cream for water work, there is no sticky or strange feeling at all, and the water-repellent protection effect is not lost even after continuous water work for a long time.

[Example] The present invention will be explained in more detail below by giving examples.

[Example] Prior to the Examples, the test method and evaluation method used in the present invention will be described.

The evaluation was carried out by sensory evaluation by a panel of 10 experts.

Ratings were made on a five-step scale from 1 to 5.

Stickiness 1: Very sticky 2: Sticky 3: Good 4: Not very sticky 5: Not sticky Water repellent 1: Not at all water repellent 2: Poor water repellency 3: Average 4: Water repellent 5: Very Durability of water repellency 1: Water repellency does not last at all: Durability of water repellency is poor: Average: Water repellency lasts to some extent = m Water repellency lasts very long〈Rating〉 O: ≧4 .5 0: <4.5 ≧3.5 △: <3.5 ≧2.5 1 Aerogel (manufactured by Nippon Aerogel Co., Ltd.) 200 to 100
4 parts of hexamethyldisilazane were stirred with a Hensel mixer and dried at 100° C. to obtain 100 parts of water-repellent fumed silica.

Production Example 2 100 parts of Carplex 67 (manufactured by Shionogi & Co., Ltd.) and 2 parts of trimethylchlorosilane were separately left in a dessicator at 50°C for one week. After drying the powder, 100 parts of water-repellent fumed silica was added. Obtained.

Example 1 Sun oil 1% by weight, water repellent treated fumed silica Tallanox 500 13.02, and dimethylpolysiloxane 5 CS 87.01.2 were mixed and put into a tube to obtain a sun oil of the present invention.

Example 2 Sunoil 1, water repellent treated fumed silica Talanox 500 2, methylphenylpolysiloxane 5cs 3, dimethylpolysiloxane 20cs 4, squalane 5, PABA Weight % 5.0 30.0 10.0 3.0 2 .0 6, LPG gas 50.01~
5 was mixed and then put into a spray container and filled with LPG gas to obtain a spray sun oil.

Example 3 Sun oil weight % 1, water repellent fumed silica of Production Example 1 5.02, methylphenyl polysiloxane 15 c s 5.0 3, dimethyl polysiloxane 20 c s 10.
04, Squalane 28.05
, PABA 2.06
, LPG gas 50.01~5
After mixing, the mixture was placed in a spray container and filled with LPG gas to obtain a spray sun oil.

Example 4 Sun oil wt % 1, water repellent treated fumed silica of Preparation Example 2 13. .

2. Dimethylpolysiloxane 5 CS 87.0
1.2 were mixed and put into a tube to obtain the sun oil of the present invention.

Comparative Example 1 Sun oil weight% 1, liquid paraffin 50.02, olive oil 30.03, squalane 18.04, PABA
1.85, fragrance
0.21 to 5 were mixed and filled into a tube to obtain sun oil.

(Margin below) The table below shows the sensory evaluation results for sun oil. Shown below.

As shown below, it can be seen that the sun oil of the present invention is excellent.

In addition, the sun oil of the present invention did not make the body feel wet even after coming out of the sea, so the body did not feel cold.

Example 5 Cream methylphenylpolysiloxane Water repellent treatment of Production Example 1 Fumed silicacetanol Weight % 30,0 8,0 0,5 Vaseline Squalane Monostearate Glycerin Polyoxyethylene Sorbitan Monostearate Jojoba Oil Propylene Glycol Glycerin Montmorillonite Potassium hydroxide sodium hyaluronate water 2, 0 7, 0 2, 5 1, 5 5, 0 5, 0 5, 0 5, 0 0, 3 0, 05 Remaining layer A (oil phase) and layer B (aqueous layer) ) are heated to 70°C to completely dissolve them. Add B to A and emulsify with an emulsifier.

The emulsion was cooled using a heat exchanger to obtain the cream of the present invention.

Comparative Example 2 Cream weight % Setanol Petrolatum Squalane Monostearate Glycerin Polyoxyethylene Sorbitan Monostearate Jojoba Oil Propylene Glycol Glycerin Montmorillonite Potassium Hydroxide Sodium Hyaluronate Water 0, 5 22, 0 25, 0 2, 5 1, 5 5 , 0 5, 0 5, 0 5, 0 0, 3 0, 05 The remaining A layer (oil phase) and B layer (aqueous layer) are each heated to 7° C. to completely dissolve. Add B to A and emulsify with an emulsifier.

The emulsion was cooled using a heat exchanger to obtain cream.

<Roughness evaluation test> A hand roughness prevention test using a human body panel was conducted using the creams with the formulations of Example 5 and Comparative Example 2 described above. i.e. 20
- 10 healthy male and female beauty technicians aged 45 years were asked to rub the creams prescribed in Example 5 and Comparative Example 2 evenly onto the back and back of their hands and fingers for two weeks while using a perm agent. I was asked to.

The state of rough hands was evaluated based on the criteria shown in Table 2.

Table-2 The results are shown in Table-3.

Table 3 As can be seen from Table 3, the cream for preventing rough hands of the present invention had excellent water repellency and was highly effective in preventing rough hands.

Further, when the hands of the above panel were examined, it was found that the anti-chapping cream of the present invention had better durability and resistance than the cream of the comparative example, and was able to form a water-repellent protective film with a smooth feel. This protective film had no sticky or strange feeling at all, and did not lose its water-repellent protective effect even after working with water for 2 hours.

Example 6 Ointment to prevent rough hands Wt% 1, methylphenylpolysiloxane 15 CS 15.0 2, dimethylpolysiloxane 100cs 51.03
, squalane 10.04,
After mixing Vaseline 4.05 and water-repellent treated fumed silica Talanox 500 20.01 to 4, 5 was added and mixed to obtain an ointment for preventing rough hands.

The ointment for preventing rough hands of the present invention had high water repellency and was highly effective in preventing rough hands.

Weight % Example 7 Anti-Rough Hand Ointment Dimethylpolysiloxane 100 cs 30.
0 Water-repellent treated fumed silica of Production Example 1 4.0 Mokuro 15.0 Polyoxyethylene mono 1.5 Oleic acid ester monostearate glycerin 2.0 Vaseline 30.0 Stearyl alcohol 12.0 Purified water
The remaining A layer (oil phase) and B layer (
aqueous layer) to 70°C to completely dissolve. Add B to A and emulsify with an emulsifier. The emulsion was cooled using a heat exchanger to obtain an ointment for preventing rough hands of the present invention. The ointment for preventing rough hands of the present invention had high water repellency (it was highly effective in preventing rough hands).

The ointment for preventing rough hands of the present invention had excellent durability and resistance, and formed a water-repellent protective film with a smooth feel.

Furthermore, the ointment for preventing rough hands of the present invention had no sticky or strange feeling at all, and did not lose its water-repellent protection effect even after working with water for a long time.

Claims (1)

[Claims] (1) A skin water repellent characterized by containing water-repellent fumed silica and silicone oil.