JP2014080397A - Oil-in-water type skin care preparation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hand cream composition: having moderate moisturizing effect and little stickiness which are difficult to achieve, when, conventionally, a water-in-oil type (W/O type) cream which has been widely used for a hand cream and an oil solution with high water repellency are used; and preventing problems that discomfort with slipping feeling is caused and a screen surface is contaminated by an oily ingredient or sebum, even if a user touches a screen surface with fingers to which the skin care preparation is used, to perform operation.SOLUTION: An oil-in-water type skin care preparation is characterized by containing at least following components (I)-(IV): (I) 0.05-0.9 wt.% of a dimethyl polysiloxane; (II) 0.08-3.0 wt.% of a nonionic surfactant; (III) 0.5-3.0 wt.% of vegetable oil; and (IV) 80-97 wt.% of water.

Description

  The present invention relates to an oil-in-water skin care formulation. More specifically, the present invention relates to a skin care preparation suitable for a hand cream that has an excellent moisturizing effect, has little stickiness, and can reduce dirt attached to the screen surface of an electronic terminal such as a smartphone or a car navigation system that is touched with fingers.

  Skin care preparations are widely used, such as hand creams used to prevent rough hands caused by water work and drying. In order to achieve this effect of preventing rough hand, the oil phase is mainly oil-in-water by using an oil agent with low skin permeability and high water-repellent effect that can suppress contact with water, and the outer phase becomes an oil phase. In many cases, a water-in-oil type (W / O type) cream that easily exhibits a higher moisturizing effect is used.

  On the other hand, there are electronic terminals such as smartphones and car navigation systems that operate by touching the screen surface with a pen and optical touch panel types, but those that touch with a pen require a pen for operation. There are problems such as inconvenience, scratches on the screen due to the pen, and malfunction of the optical touch panel type. Such a problem can be solved, and a type in which a touch operation is performed with a finger has become the mainstream in recent years as having intuitive operability.

  As described above, the hand cream is generally a water-in-oil type cream using an oil agent having low skin permeability. However, using such a water-repellent oil agent or using a water-in-oil (W / O) cream causes a feeling of oiliness (stickiness) in the fingers, and the fingers using the hand cream Touching the screen surface of an electronic terminal or the like is not preferable because oily components derived from hand cream and sebum from fingers tend to adhere through a water-in-oil cream and cause the screen to be severely soiled.

  For example, Patent Document 1 discloses a water-in-oil hand cream that uses a liquid oily base and a specific emulsifier, stabilizes the system, reduces the separation of the water phase and the oil phase, and can be expected to spread on the skin. Is to try to propose. Since this technology uses a liquid oil base, the elongation is good and the stickiness can be partially improved, but because it is a water-in-oil design, touching the screen surface with a finger using this cream It is not preferable because it adheres and is easily contaminated.

  On the other hand, Patent Document 2 proposes a transparent or translucent oil-in-water emulsified cosmetic composition comprising a specific oil phase and an aqueous phase. However, since this oil-in-water emulsified cosmetic contains at least 20% by weight of the oil phase and does not limit the components used in the oil phase, it contaminates the screen surface with a highly water-repellent oil agent. It is pointed out that the feeling of use is unfavorable, especially when trying to operate an electronic terminal with a plastic exterior using this oil-in-water emulsified cosmetic, because it slips and becomes sticky. It was. In addition, as shown in the literature, dimethylpolysiloxane is sometimes used as a kind of oil agent in skin care preparations or the like as a silicone oil having a volatile low molecular weight. However, conventional blending purposes have been used in large quantities, such as stabilizing the emulsified state or being used as a substitute for other oil agents, or have not been added by using other oil components.

Japanese Patent No. 3509108 JP 2005-225824 A

  Conventional skin care preparations have used hydrocarbon-based components having a high melting point, such as wax and petrolatum. This is because such a component has water repellency, and thus a high moisturizing effect can be exhibited for a long time by forming a film for preventing moisture from volatilizing on the skin surface. However, these hydrocarbon-based high melting point oily components are sticky, and when used as a hand cream and touching the screen surface, traces of the hand cream (mainly oily components) adhere to the screen surface. It was easy.

  In addition, conventional creamy skin care preparations, particularly hand creams, often have about 30 to 70% water. This is because many of the conventional creamy skin care preparations use a water-in-oil type, and it has been difficult to adopt a structure in which water is the main ingredient. Alternatively, since the surfactant used is different, it is difficult to design a viscosity and spread suitable as a skin care preparation after having a high water content.

  Therefore, the present invention has a moderate moisturizing effect while being an oil-in-water type, has less stickiness, and has an uncomfortable feeling that the screen surface slides even when touched with fingers using the skin care preparation, An object of the present invention is to provide an oil-in-water type skin care preparation capable of preventing problems such as contamination of the screen surface due to oily ingredients, cream, fingerprints and sebum.

  As a result of intensive studies to solve the above problems, the present inventor has found that the following inventions meet the above object, and have reached the present invention.

That is, the present invention relates to the following inventions.
<1> An oil-in-water skin care formulation containing at least the following components (I) to (IV).
(I) 0.05 to 0.9% by weight of dimethylpolysiloxane
(II) 0.08 to 3.0% by weight of nonionic surfactant
(III) 0.5 to 3.0% by weight of vegetable oil
(IV) 80 to 97% by weight of water
<2> The skin care preparation according to <1>, further comprising the following component (V).
(V) 0.01 to 1.7% by weight of a hydrocarbon-based oil liquid at room temperature
<3> The skin care preparation according to <1> or <2>, further comprising the following component (VI).
(VI) 0.01 to 2.0% by weight of a humectant
<4> The skin care preparation according to any one of <1> to <3>, which contains polyoxyethylene lauryl ether and / or polyoxyethylene oleyl ether as the nonionic surfactant.
<5> A hand cream comprising the skin care preparation according to any one of <1> to <4>.

  According to the present invention, while having the original moisturizing effect of the skin care preparation, there is little stickiness, and even if the screen surface is manipulated with fingers using the skin care preparation, it is possible to reduce contamination due to oil or sebum. In particular, there is a growing need for touch-screen electronic terminals that operate with fingers such as smartphones and car navigation systems, and needs that air conditioning is maintained and the fingers dry out regardless of the season. Is very suitable.

  Hereinafter, embodiments of the present invention will be described in detail with specific examples.

The present invention comprises at least (I) 0.05 to 0.9% by weight of dimethylpolysiloxane, (II) 0.08 to 3.0% by weight of nonionic surfactant, and (III) 0.5% of vegetable oil. It is an oil-in-water skin care preparation characterized by containing -3.0 wt% and (IV) 80-97 wt% of water.
With this configuration, the skin care preparation according to the present invention has an appropriate moisturizing property, and even when the skin using the skin care preparation touches the screen surface such as a monitor screen, the oil agent derived from the skin care preparation Or cream and sebum are difficult to migrate and difficult to get dirty.

  The skin care preparation of the present invention has an excellent skin permeability by having an oil-in-water configuration, and also has a moisturizing effect by using the components of the present invention. In order to obtain this oil-in-water type, the nonionic surfactant (II), the vegetable oil (III) and the water (IV) are emulsified by a predetermined method. Furthermore, while the oil-in-water type is only solved by adding dimethylpolysiloxane having a concentration of (I), which is difficult to solve, the skin care preparation slips when operating an electronic terminal or the like. It is possible to prevent the skin care preparation from sticking to the screen. Moreover, this oil-in-water skin care preparation is also excellent in stability.

  One of the characteristics of the present invention is that 0.05 to 0.9% by weight of dimethylpolysiloxane is contained. By containing dimethylpolysiloxane within this range, the skin care preparation of the present invention can significantly reduce the oily feeling (so-called stickiness) of conventional hand creams. When the amount of dimethylpolysiloxane is less than this range, this oily feeling cannot be sufficiently reduced. Moreover, when there is too much addition amount, when it touches the screen surface etc., it will become the sense of slipping, a discomfort may arise, and the operativity of an electronic terminal may fall. The addition amount of dimethylpolysiloxane varies depending on the addition amount of surfactant and oil component, the molecular weight of dimethylpolysiloxane, and the like, but preferably 0.1 to 0.7% by weight, more preferably 0.2. ~ 0.4 wt%.

The viscosity of the dimethylpolysiloxane used in the present invention is preferably 1 to 100,000 mPa · s, more preferably 5 to 5000 mPa · s, and particularly preferably 10 to 1000 mPa · s. When the viscosity of dimethylpolysiloxane is within this range, it exhibits particularly excellent stickiness prevention and slip prevention effects. On the other hand, when the molecular weight of dimethylpolysiloxane is too small, dimethylpolysiloxane has volatility, so it becomes difficult to feel the moisturizing feeling immediately after the skin care preparation is applied, or the time for having an appropriate stickiness eliminating effect is shortened. Sometimes. On the other hand, when the molecular weight is too large, it may take a long time to adjust the cream, it may become difficult to disperse, or the stickiness eliminating effect may not be exhibited. Here, the viscosity of dimethylpolysiloxane is measured with a B-type viscometer after the liquid temperature is kept at 25 ° C. using a thermostatic bath.
The addition amount of dimethylpolysiloxane in the present invention is for the purpose of improving the touch to the skin after use, and is added within a range that eliminates slipping when operating the electronic terminal. In order to drastically improve the oily feeling that causes the screen surface to become dirty, the ingredients that can be added were selected from among intensive studies.

  The skin care preparation of the present invention is characterized by containing 0.08 to 3.0% by weight of a nonionic surfactant. An oil-in-water cream can be obtained by using a nonionic surfactant and containing vegetable oil, water, and dimethylpolysiloxane and mixing them in a predetermined process. In order to achieve an emulsified state preferable as a skin care preparation, the surfactant is required to have the above-mentioned content. When the amount of the surfactant added is too small or too large, a sufficient emulsified state may not be obtained, or the emulsified state may become unstable, and may not be stored for a long time due to stability. The addition amount of the surfactant is preferably 0.08 to 1.0% by weight, more preferably 0.1 to 0.5% by weight.

  The surfactant that can be used in the present invention is mainly composed of a nonionic surfactant. Cationic surfactants and anionic surfactants are frequently used in shampoos and detergents, but these may be highly irritating to the skin. Since the skin care preparation used in the present invention may be used on the skin for a long time, it is required to have a low skin irritation, and the nonionic surfactant has such a low skin irritation. Is suitable. The skin care preparation of the present invention may contain a cationic or anionic surfactant having low skin irritation as long as it is a small amount up to about 20 parts by weight with respect to 100 parts by weight of the nonionic surfactant. good.

  Examples of the nonionic surfactant used in the present invention include polyoxyethylene alkyl ethers such as polyoxylauryl ether, polyoxyoleyl ether, polyoxyethylene cetyl ether, polyoxyethylene stearyl ether, and polyoxyethylene behenyl ether. The Among these, it is preferable to contain polyoxyethylene lauryl ether and / or polyoxyoleyl ether. In particular, the number of moles of oxyethylene added is preferably 2 to 30, and more preferably 4 to 25. Specific examples include Laureth-4, Laureth-7, Laureth-8, Laureth-23, and the like.

  The skin care preparation of the present invention is characterized by containing 0.5 to 3.0% by weight of vegetable oil. In order to solve such problems, the present invention is characterized in that vegetable oil is used as the oil component. As such vegetable oil, sunflower oil, macadamia nut oil, jojoba oil, yucha oil, hazelnut oil, olive oil and the like can be used alone or in combination. Among vegetable oils, those containing oleic acid as a main component are preferred. The vegetable oil is preferably a vegetable oil that is liquid at room temperature, and it is preferable to use a vegetable oil that does not smell unpleasant to humans.

  Since such vegetable oil is an oily component with high skin permeability, it is easy to adapt to the skin, and even if the skin care formulation using these oily components is used for fingers, etc. Oil does not easily migrate to the surface. Moreover, since it is easy to adapt to a finger, stickiness (oiliness) hardly occurs. Furthermore, since the skin affinity is high, it has a moisturizing effect from the inside of the skin, not the water-repellent moisturizing of the skin surface.

  Further, the skin care preparation of the present invention may contain 0.01 to 1.7% by weight of other oily components that are liquid hydrocarbon oils at room temperature. As described above, it is not preferable to use hydrocarbon oils having a high solid water repellency at room temperature, such as wax, petrolatum, lanolin, etc., which have been widely used in the past, but even hydrocarbon oils are liquid at room temperature. If it is a thing, even if it contains within the said range, the objective of this invention can fully be achieved. Examples of the oil agent that can be added here include liquid paraffin and squalane. Even if such an oil agent is used incidentally, the above-described vegetable oil is the main oil component, so that it can be used as being easily adapted to the skin.

  On the other hand, the present invention is required to be substantially free of hydrocarbon oils that are solid at room temperature, such as wax, paraffin, petrolatum, and lanolin. Moisturizing properties can be easily increased by including these components, but these components are the main causes of screen surface contamination, so it is necessary not to make them the main components of oily components. It is. Here, it is most preferable that it is 0 because it can be achieved by not using these components as a raw material of a skin care preparation, substantially not containing a hydrocarbon-based oil that is solid at room temperature. The meaning which may be contained a little within the range which can achieve the objective of this invention is pointed out. Specifically, the amount of the hydrocarbon-based oil that is solid at room temperature in the skin care preparation of the present invention is 0 to 0.5% by weight, more preferably 0 to 0.1% by weight.

  The skin care preparation of the present invention contains 80 to 97% by weight of water. In the present invention, since it is an oil-in-water type using a specific surfactant, water can be contained at a concentration as described above. By adopting this configuration, there is spreadability, and there is an effect that the entire skin (particularly, a hand when used as a hand cream) can be spread quickly.

  The present invention is achieved as an oil-in-water cream. In order to make an oil-in-water cream, the selection of an oil agent, the selection of a surfactant to be used as an emulsifier, the mixing ratio of water and oil, the mixing process, etc. are appropriately adjusted. For example, it can be adjusted by the following steps. As an example, a case where a cream made of water, a water-soluble additive (such as an antiseptic or a humectant added if necessary), dimethylpolysiloxane, a surfactant, and an oily component is prepared will be described. First, a water-soluble additive is added to a predetermined amount of water and stirred. Thereafter, a surfactant is further added and stirred. Next, an oil component is added and stirred. Since this oil-in-water cream has a slightly high viscosity after this stirring, an oil-in-water cream can be obtained by adding the remaining water and stirring. In this way, an oil-in-water cream can be obtained by adding and stirring a predetermined amount of water, water-soluble additive, surfactant, oil component, and remaining water in this order in consideration of the amount of other components.

  In addition, a phase inversion emulsification method in which the continuous layer changes in the process of emulsification by mechanical stirring, a phase inversion temperature emulsification method (PIT: Phase Inversion Temperature emulsification method in which emulsification is performed by rapidly cooling after stirring around the phase inversion temperature. You may emulsify by methods, such as an emulsification method.

  Since the oil-in-water skin care preparation of the present invention can increase the water content, it can be easily reduced in viscosity as compared with general water-in-oil hand creams. For this reason, it can discharge with a simple dispenser (liquid fixed amount discharger) used for a commercial cosmetics etc. The viscosity of the oil-in-water skin care preparation of the present invention is preferably 1000 mPa · s to 7000 mPa · s when adjusted for a dispenser. Here, the viscosity of the skin care preparation can be measured by using a B-type viscometer (model BH) manufactured by Tokyo Keiki Co., Ltd., maintained at 25 ° C. in a thermostatic bath and using a rotation speed and a rotor appropriately adjusted to the viscosity. it can.

  In the present invention, it is preferable to add a moisturizing agent in order to assist the moisturizing property. A moisturizing agent suitable for the present invention refers to a moisturizing agent having a high affinity with water, and has a high melting point that attempts to obtain a moisturizing effect by forming a film of a water repellent component on the skin surface. The oily component is not included. Examples of such a component that exhibits a moisturizing effect due to affinity with water include sodium hyaluronate, polyquaternium, aloe vera juice, trehalose, urea, polyhydric alcohol, sodium 2-pyrrolidone-5 carboxylate, and the like. .

  In the present invention, a thickener or a thickener may be added as appropriate for the purpose of adjusting the viscosity, elongation and the like of the oil-in-water skin care preparation. Examples of the thickener used for cosmetic applications include polyacrylamide and hydrogenated polyisobutene.

  A known preservative can be added to the skin care preparation of the present invention in order to provide long-term stability. Examples of such preservatives include sodium benzoate, phenoxyethanol, methyl paraben, and salicylic acid.

  In addition, fragrances and pigments that are preferred as cosmetics, fine particles such as clay minerals that are added to improve or feel the gloss may be added as appropriate.

  The skin care preparation of the present invention has a moisturizing effect, prevents stickiness and is easy to adjust to the skin, and thus is suitable for a wide range of skin care preparations. Since it can reduce, especially when used as a hand cream, the outstanding effect is exhibited.

  EXAMPLES Hereinafter, although an Example demonstrates this invention further in detail, this invention is not limited to a following example, unless the summary is changed.

[Evaluation method]
“Moisturizing”
The skin care preparations of Examples and Comparative Examples were used as hand creams, and the moisturizing properties were evaluated as follows from the feeling of use 20 minutes after use. The number of test subjects is 5, and the average of each test result is shown in Table 1.
A: A moist feeling is maintained.
○: A moist sensation persists but slightly dry.
Δ: Moist immediately after use, but feels dry with time.
X: There was almost no moist feeling.

"Stickness (oiliness)"
The skin care preparations of Examples and Comparative Examples were used as hand creams, and the stickiness was evaluated as follows from the feeling after use. The number of test subjects is 5, and the average of each test result is shown in Table 1.
A: Feels almost non-sticky and adapts to the skin.
○: Not very sticky.
Δ: Feels slightly sticky.
X: Feels sticky.

"Slip"
The skin care preparations of this example and comparative example were used as hand creams, and immediately after use, the slip was evaluated as follows from the feel when holding a plastic case with a smooth surface. The number of test subjects is 5, and the average of each test result is shown in Table 1.
A: It can hold firmly without slipping.
○: Almost does not slip, but feels slightly difficult to carry.
Δ: Slightly slipping and feels difficult to hold.
×: Slippery and difficult to hold.

"Dirty screen surface"
The skin care preparations of this example and the comparative example were used as hand creams, and the screen surface when the mobile phone monitor was touched with a finger immediately after use was observed, and the screen surface was evaluated as follows. The number of test subjects is 5, and the average of each test result is shown in Table 1.
A: Oily components and dirt such as sebum hardly adhere.
○: Slight dirt such as oil component or sebum adheres.
(Triangle | delta): Dirt, such as an oily component and sebum, adheres clearly.
X: In particular, it is recognized that traces derived from oily components and cream are clearly attached.

"Viscosity of skin care products"
The viscosities of the skin care preparations of the present examples and comparative examples were maintained at 25 ° C. in a thermostatic bath using a B-type viscometer (model BH) manufactured by Tokyo Keiki Co., Ltd. 4 was measured.

[material]
The raw materials used in the examples and comparative examples of the present invention are as follows.
"Water": RO water was used by reverse osmosis membrane filtration system

“Dimethylpolysiloxane”: “KF-96A-200cs” manufactured by Shin-Etsu Chemical Co., Ltd.
Although the dimethylpolysiloxane base oil is as described above, a premixed product with Laureth-4 and Laureth-23, which are nonionic surfactants, was used in order to ensure handling properties.

(Vegetable oil)
"Sunflower oil": "High oleic sunflower oil" manufactured by Yokoseki Oil & Fat Co., Ltd.
“Macadamia nut oil”: “refined macadamia nut oil” manufactured by Yokoseki Oil & Fat Co., Ltd.
"Jojoba oil": "refined jojoba oil" manufactured by Yokoseki Yushi
"Yucha oil": "refined mountain tea oil" manufactured by Yokoseki Oil & Fat Co.
"Hazelnut oil": "NIKKOL (registered trademark) hazelnut oil" manufactured by Nikko Chemicals
"Olive oil": "NIKKOL (registered trademark) olive oil" manufactured by Nikko Chemicals

(Liquid hydrocarbon oil at room temperature)
“Liquid paraffin”: KukdongOil & Chemicals Co. , Ltd. “White Oil Lily 70”
“Squalane”: “NIKKOL (registered trademark) Squalane” manufactured by Nikko Chemicals

(Hydrocarbon oil that is solid at room temperature)
“Vaseline”: “Chloratum V (registered trademark)” manufactured by Croda Japan
"Microcrystalline wax": Nippon Seiwa Co., Ltd. "paraffin wax-120"
“Lanoline”: “Purified Lanolin” manufactured by Nippon Seika Co., Ltd.

(Nonionic surfactant)
“Laureth-7”: SEPPIC S. Containing “Laureth-4” as a component in “Sepigel (registered trademark) 305” manufactured by Company A: derived from a premixed product of dimethylpolysiloxane.
“Laureth-23”: derived from a premixed product of dimethylpolysiloxane.

(Anionic surfactant)
“Sulfosuccinic acid (C12-15) Palace 2Na”: derived from a premixed product with dimethylpolysiloxane.

(Thickener)
“Hydrogenated polyisobutene”: SEPPIC S. “Polyacrylamide” contained as a component in “Sepigel (registered trademark) 305” manufactured by Company A: SEPPIC S. Contained as a component in “Sepigel (registered trademark) 305” manufactured by Company A

(Humectant)
“Hyaluronic acid Na”: “Hyaluronic acid FCH201C” manufactured by Kikkoman Biochemifa
“Polyquaternium-51”: “Lipidure (registered trademark) PMB (Ph10)” manufactured by NOF Corporation
“Aloe Vera Juice”: “Green Aloe Vera Gel (1: 1)” manufactured by Air Green

(Other additives)
"Na benzoate": "Sodium benzoate" manufactured by Aioka Corporation
“Phenoxyethanol”: “Phenoxytol” manufactured by Clariant Japan
“Scent”: Kao “Lucky TRC0011”

(Manufacturing method of O / W type skin care preparation)
With the component amounts shown in Table 1, Examples 1 to 10 of the present invention, O / W type skin care preparations in Comparative Example 1 and Comparative Example 3 were prepared by the following process. To 40 parts by weight of water, a water-soluble additive (humectant, preservative, stabilizer, etc.) is added and stirred until it is sufficiently dispersed (or dissolved). Thereafter, a premix product of surfactant and dimethylpolysiloxane is further added and stirred sufficiently. Next, all the oil components (vegetable oil, liquid hydrocarbon oil at normal temperature, and hydrocarbon oil solid at normal temperature) are added and stirred. After stirring, the oil-in-water type emulsified state has a slightly high viscosity. Therefore, an oil-in-water type skin care preparation can be obtained by adding the remaining water and stirring the total amount of all components to 100 parts by weight.

(Method for producing W / O type skin care preparation)
As Comparative Example 2, a W / O type skin care preparation was produced with the component amounts shown in Table 1. In Comparative Example 2, first, a surfactant is added to the oil component and stirred until it is sufficiently dispersed (or dissolved). Next, a water-soluble additive is added and stirred. Furthermore, the remaining water was added and the total amount of all the components was stirred to 100 parts by weight to obtain a W / O type skin care preparation.

(Evaluation results)
When the skin care preparations of Examples 1 to 10 according to the present invention were used as hand creams, the evaluation results of moisture retention, stickiness, slippage, and adhesion of dirt to the screen surface were excellent. In particular, the hand cream according to Example 10 was excellent in all evaluation results. On the other hand, since the skin care preparation of Comparative Example 1 did not contain dimethylpolysiloxane, it was sticky and unfavorable. Further, the skin care preparation of Comparative Example 2 is a water-in-oil skin care preparation containing a hydrocarbon that is solid at room temperature, which has been widely used in the past, and feels sticky and easily contaminates the screen surface. Further, the skin care preparation of Comparative Example 3 was not stable in the emulsified state because the amount of surfactant added was insufficient.

  The skin care preparation of the present invention is used as a skin care preparation because it is moisturizing, has little stickiness, and prevents adhesion of oily components and the like to the screen surface. In particular, it is suitable for use as a hand cream.

Claims (5)

An oil-in-water type skin care formulation comprising at least the following components (I) to (IV):
(I) 0.05 to 0.9% by weight of dimethylpolysiloxane
(II) 0.08 to 3.0% by weight of nonionic surfactant
(III) 0.5 to 3.0% by weight of vegetable oil
(IV) 80 to 97% by weight of water The skin care preparation according to claim 1, further comprising the following component (V).
(V) 0.01 to 1.7% by weight of a hydrocarbon-based oil liquid at room temperature The skin care preparation according to claim 1 or 2, further comprising the following component (VI).
(VI) 0.01 to 2.0% by weight of a humectant   The skin care preparation according to any one of claims 1 to 3, comprising polyoxyethylene lauryl ether and / or polyoxyethylene oleyl ether as the nonionic surfactant.   A hand cream comprising the skin care preparation according to any one of claims 1 to 4.