JP4896650B2 - Novel water-soluble scrub agent and oil-based skin cleansing agent containing the scrub agent - Google Patents

Description

  The present invention relates to a water-soluble scrub agent containing polyethylene glycol and a water-soluble silicone-based surfactant, and an oily skin cleansing composition containing the scrub agent. More specifically, the present invention relates to an oily skin cleanser which is excellent in familiarity with cosmetics (= cleanability) and has no sticky feeling on the back skin.

  In recent years, cosmetics such as oily mascara, lipsticks that are difficult to remove, sunscreens with excellent water resistance, foundations and eye shadows that have excellent adhesion to the skin, and cosmetics that are difficult to lose makeup have been developed. Therefore, development of cosmetics with a high cleansing effect is desired. Conventionally, water-based cleansing cosmetics have a problem that the cleansing power is weak although there is little oiliness after cleansing. On the other hand, cleansing creams and oil gels, which are oily-type and water-in-oil emulsions, have a continuous phase of oil, so they have excellent familiarity with cosmetics (= detergency) and have a high cleansing effect, but are sticky after use. There was a problem.

  In addition, with the aim of enhancing the cleaning effect to remove dirt on the skin, it is possible to study using a component with a high solvent effect, study to formulate a large amount of surfactant, study to formulate a scrub agent, or use the liquid crystal state. Attempts have been made to increase the cleaning effect.

  Among them, scrub agents are often used from the viewpoint of a high cleaning effect by physical action and removal of an aging stratum corneum, and studies on the material and shape of the scrub agent have been made (for example, patent documents). 1-3).

In patent document 1, scrub feeling is provided by mix | blending organic powder and inorganic powder, and foaming property and cleaning power are improved. In Patent Document 2, the feeling of use and cleanability are enhanced by blending hydrophobized particulate titanium oxide. Patent Document 3 provides a cosmetic material that has a smooth skin per disintegration by blending easily disintegratable granules composed of a water-insoluble powder and an acrylic polymer emulsion.
JP 2006-188435 A JP-A-6-21644 JP-A-1-190616

  However, in the case of the scrub agents of Patent Document 1 and Patent Document 2, although there is a scrub effect, the structure of the scrub does not change, which may cause stimulation by excessive massage. In the case of the scrub agent of Patent Document 3, it has a smooth feel, but since it disintegrates finely, the effect as a scrub agent disappears in the middle of use, and the skin after use is also powdered. In some cases, the body remained, and a refreshing feel could not be obtained.

  The first object of the present invention is to develop a new scrub agent in order to solve the problem of usability of the scrub agent itself such as stimulation. In addition, as a second object, an oily skin cleanser that improves the familiarity with dirt (= cleanability) and reduces the stickiness of the oil on the back skin by incorporating the scrub agent into the oily skin cleanser. Is to provide.

  Under such circumstances, the present inventors have conducted extensive research to solve the above-mentioned problems, and as a result, obtained a polyethylene glycol that is solid at 25 ° C. and a water-soluble silicone surfactant having a paste-solid state at 25 ° C. that is HLB 7 or higher. It has been found that the above-mentioned problems can be solved by preparing a water-soluble scrubbing agent to be contained and blending the scrubbing agent with an oily skin cleanser.

The scrub agent of the present invention has a mild physical irritation to the skin, and when formulated in an oily skin cleansing agent, it acts as a scrub agent at the time of cleaning, and has the effect of increasing familiarity (= detergency) with dirt. It has the effect of reducing the stickiness of the oil after washing.

Hereinafter, first, the water-soluble scrub agent of the present invention will be described in detail.
The polyethylene glycol of component (a) is not only limited as long as it is solid at 25 ° C., but it is blended for the purpose of not only reducing the stickiness of oil but also adjusting the hardness of the water-soluble scrub agent. . In the present invention, it is used in combination with the water-soluble silicone surfactant of component (b). In addition, the component (a) not only improves the cleaning effect as a scrub agent, but also forms a film on the skin when rinsed with water when blended in an oily skin cleansing agent. It becomes possible to reduce the stickiness of the oil.

  The polyethylene glycol of component (a) preferably has an average molecular weight of 5000 to 50000, more preferably an average molecular weight of 6000 to 25000, from the viewpoint of usability as a scrub agent and the hardness of the scrub agent itself. When polyethylene glycol having an average molecular weight in this range is used, there is little irritation to the skin, and the effect of the scrub agent is excellent. Such polyethylene glycol as component (a) can be used alone or in combination of two or more. Specific examples include commercially available products such as polyethylene glycol 20000 (manufactured by NOF Corporation, average molecular weight: 15500 to 25000). The average molecular weight is measured by an average molecular weight test of polyethylene glycol 4000 described in the outer primordium.

  The water-soluble silicone surfactant of component (b) is used in combination with the polyethylene glycol of component (a), but it is washed away with water after use when blended in an oily skin cleanser as well as a scrub effect. It is characteristic that it dissolves in water. That is, by dissolving in water to form a silicone film, the oily stickiness can be alleviated and a refreshing feel can be obtained.

  The water-soluble silicone surfactant of component (b) is preferably pasty to solid at 25 ° C., and a solid is more effective as a scrub agent and more preferable. Moreover, when it mix | blends with an oily skin cleaning material as it is HLB7 or more, More preferably, it is HLB8-15, it will become the refreshing touch which was excellent in the solubility to water. When the HLB is less than 7, when blended in an oily skin cleanser, the water solubility is poor and a refreshing feel cannot be obtained. Such component (b) can be used alone or in combination. Specific examples of the component (b) include polyoxyethylene / methylpolysiloxane copolymer, and examples thereof include commercially available products such as KF-6004 (manufactured by Dow Corning Toray).

  The water-soluble scrub agent of the present invention is obtained by mixing the components (a) and (b) at a specific ratio in order to reduce the scrub effect and the stickiness of the oil after use. The effect can be further improved. Although component (a) alone can provide an effect as a scrub agent, it is not easy to reduce the sticky feeling due to the oil agent after washing away when blended in an oily skin cleanser. In addition, the component (b) alone swells into an oil agent at a high temperature or over time and loses its hardness as a scrub agent.

The blending mass ratio of such component (a) and component (b) is preferably (a) :( b) = 1: 9 to 9: 1, more preferably (a) :( b) = 3. : 5-5: 3. If it is this range, it is excellent in the familiarity (= washing | cleaning property) with the stain | pollution | contamination by a scrub agent, and also in the point which makes it hard to feel the sticky feeling by the oil agent after use.

  The average particle diameter of the water-soluble scrub agent of the present invention is not particularly limited, but is preferably 50 to 1000 μm from the viewpoint of the effect and usability of the scrub agent. The most preferable range is 100 to 800 μm. By using in this range, the effect as a scrub agent becomes more remarkable, and the usability can be made uncomfortable. In addition, the average particle diameter of the water-soluble scrub agent is a value when measured using a laser diffraction / scattering particle size distribution measuring device (Laser diffraction / scattering particle size distribution measuring device LA-910 manufactured by Horiba, Ltd.). Moreover, the scrub agent of this invention can be used 1 type, or 2 or more types.

  The production method of the water-soluble scrub agent of the present invention is not particularly limited, but as an example, after heating the polyethylene glycol of component (a) and the water-soluble silicone surfactant of component (b) and uniformly dissolving, The scrub agent can be obtained by making it fine. As a method for forming fine particles, there is a method of mechanically pulverizing a compatible material of component (a) and component (b) with a jet mizer or the like. In addition, there is a method in which a compatible product of component (a) and component (b) is dissolved in a solvent, and this is spray dried by a spray drying method. This can be obtained by any method. It is also possible to use after classification using a sieve or the like. On the other hand, the shape of the water-soluble scrub agent of the present invention is preferably spherical from the viewpoint of usability such as stimulation, but may be indefinite.

Next, the oil-based skin cleansing composition containing the water-soluble scrub agent of the present invention will be described in detail.
By blending the water-soluble scrub agent of the present invention into an oily skin cleanser, it is possible to exert its effects more remarkably. That is, the water-soluble scrubbing agent can improve the familiarity (= detergency) with dirt, and can improve the stickiness of the oil agent, which is a problem of the oily skin cleanser. Moreover, although the blending amount of the water-soluble scrub agent of the present invention is preferably 0.1 to 20% from the viewpoint of scrub feeling and oily stickiness, it may be outside this range.

  Furthermore, powder can be mix | blended with the oil-based skin cleansing agent of this invention as a component (c). By blending the powder, it becomes possible to improve the familiarity (= cleanability) with further dirt. The average particle size and material of these powders are not particularly limited, but the average particle size is preferably 3 to 100 μm, and the material is preferably organic powder. Further, as the most preferable example, silicone elastomer powder and urethane powder are particularly excellent from the viewpoint of less burden on the skin and stability with an oily base material. Specifically, as an example of silicone elastomer powder, And KSP-100 (manufactured by Shin-Etsu Chemical Co., Ltd., average particle size: 3 to 8 μm).

  The scrub agent of the present invention and the oily skin cleansing composition containing the scrub agent each include components used in normal cosmetics in addition to the water-soluble scrub agent described above, for example, surfactants, liquid oils, oils. Gelling agents, waxes, glycols, lower alcohols, water, UV absorbers, antioxidants, cosmetic ingredients, dyes, pigments, preservatives, fragrances, etc. may be blended within a range that does not impair the effects of the present invention. Can be obtained by the usual method of manufacturing cosmetics

  The water-soluble scrub agent of the present invention can be blended in various cosmetics as long as the effect is not impaired. Specifically, the water-soluble scrub agent can be suitably used for facial cleansers, hand soaps, massage materials and the like. There are various dosage forms such as solids, creams, pastes, gels, liquids, etc., but there is no particular limitation.

  Next, the present invention will be described in more detail with an example of producing a water-soluble scrub agent and an example of an oily skin cleansing agent containing the scrub agent. The present invention is not limited to these examples.

Examples 1 to 5: Water-soluble scrub agent Examples 1 to 5 shown in Table 1 were prepared by the production method shown below.

(Method for producing water-soluble scrub agent)
The component (a) and the component (b) shown in Table 1 were heated, mixed and dissolved uniformly, and the dispersed sample was cooled at 5 ° C. for 30 minutes. Then, it grind | pulverized with the bantam mill, and also classify | categorized using the sieve, and set it as the sample by aligning the particle diameter. The average particle size of the water-soluble scrub agent was measured using a laser diffraction / scattering particle size distribution analyzer (Laser diffraction / scattering particle size distribution analyzer LA-910, manufactured by Horiba, Ltd.).

Examples 6 to 13 and Comparative Examples 1 to 5: Oil-based skin cleanser with a water-soluble scrubbing agent Oil-based skin cleansers having the compositions shown in Tables 2 and 3 were prepared by the manufacturing method shown below. After applying the indicated lipstick to the lip, take 2 g of the material and stretch it over the entire lip, and after 30 seconds, massage it in a circle and then wash it away with water. “Familiarity (= detergency)” and “no stickiness after washing” were evaluated by the following evaluation methods and criteria, and the results are shown in Tables 2 and 3.

Example of lipstick formula (component) (%)
1. Microcrystalline wax 9.0
2. Polyethylene wax (average molecular weight 5000) 8.0
3. Isotridecyl isononanoate 5.0
4). Refined jojoba oil 0.2
5). Lanolin 8.0
6). Diisostearyl malate 20.2
7). Glyceryl tri-2-ethylhexanoate 21.0
8). Isopropyl myristate 8.0
9. Decamethylcyclopentasiloxane 6.0
10. Trimethylsiloxysilicic acid 3.0
11. (Alkyl acrylate / dimethicone) copolymer 3.0
12 Mica titanium (Note 3) 3.0
13. Titanium dioxide 3.0
14 Yellow No. 4 aluminum lake 0.6
15. Red No. 202 1.0
16. Red 226 0.2
17. Natural vitamin E Perfume appropriate amount (Note 3) Timilon Super Gold (Merck)

Lipstick production method A: Components 10 and 11 are mixed and dissolved in component 9.
B: A and components 1 to 8 and 12 to 18 are heated and dissolved, and then roller-treated.
C: B was filled and molded into a container to obtain a lipstick.

(Manufacturing method of each sample)
According to each formulation shown in Table 2 and Table 3, after mixing and stirring components 1 to 16 which are oily components, components 17 to 25 are added and mixed and stirred to make the oily skin cleanser uniform. Obtained.

(Evaluation methods)
About the said product of this invention and a comparative product, a usage test is conducted by 20 specialist panels, and each sample is evaluated in 7 stages using the following absolute evaluation criteria for the following evaluation items, and the average value of the scores of each sample Based on the following judgment criteria.

(Evaluation item)
a. "Familiarity with lipstick (= detergency)"
b. “No stickiness after washing”
(Absolute evaluation criteria)
(Score): (Evaluation)
6: Very good 5: Good 4: Somewhat good 3: Normal 2: Somewhat bad 1: Bad 0: Very bad (judgment criteria)
(Judgment): (Average score)
◎: More than 5 points: Very good ○: More than 3 points, 5 points or less: Good △: More than 1 point, 3 points or less: Slightly poor ×: 1 point or less: Bad

  As is clear from the results of Table 2 and Table 3, the oily skin cleansing agents of Examples 6 to 13 are “Familiarity with lipstick (= detergency)” and “No stickiness after washing”. It had excellent properties. On the other hand, in Comparative Example 1 in which the water-soluble silicone surfactant is not blended in the scrub agent, the stickiness of the oil after use remains, and in Comparative Example 2 in which the polyethylene glycol is not blended in the scrub agent, the stability is poor and swelling is caused. Therefore, in Comparative Example 3 in which the familiarity with the lipstick (= detergency) was poor and no scrub agent was blended, the familiarity with the lipstick (= detergency) and the stickiness of the oil after washing remained, and the urethane powder was blended In Comparative Example 4 and Comparative Product 5 containing talc, the stickiness of the oil after washing remained.

Example 14: Liquid detergent for removing sunscreen (component) (%)
1. Remaining amount of cetyl ethyl hexanoate Polyglyceryl diisostearate 0.1
3. Diglyceryl triisostearate 0.1
4). Jojoba oil 10.0
5). Plant-based squalane 20.0
6). Decamethylcyclopentasiloxane 5.0
7). Fragrance 0.1
8). Rose oil 0.02
9. Stearyl glycyrrhetinate 0.1
10. Isostearyl alcohol 4.0
11. Tetraoleic acid polyoxyethylene sorbit (HLB11.5) 1.0
12 Water-soluble scrub agent of Example 1 7.0

(Production method)
A part of component 9 and component 5 are heated and dissolved, and after cooling, the remainder of component 5 and components 1-4, components 6-8, and components 10-12 are mixed uniformly to obtain a sunscreen removing liquid detergent. It was.

Example 14 was an excellent liquid cleaning agent for removing sunscreen, in terms of “familiarity with sunscreen (= detergency)” and “no stickiness after cleaning”.

Example 15: Oily skin cleanser (component) (%)
1. 1. Glyceryl tri-2-ethylhexanoate Trimethylolpropane triisostearate 20.0
3. Meadow foam oil 20.0
4). Macadamia nut oil 20.0
5). Vegetable squalane 10.0
6). Decamethylcyclopentasiloxane 5.0
7). Fragrance 0.1
8). Ethyl oleate 1.0
9. Dibutylhydroxytoluene 0.1
10. Heavy liquid isoparaffin 5.0
11. Oleyl alcohol 0.5
12 Tetraoleic acid polyoxyethylene sorbit (HLB11.5) 2.5
13. Diglyceryl diisostearate 5.0
14 Water-soluble scrub agent of Example 2 10.0

(Production method)
Components 1 to 14 were uniformly mixed to obtain an oily skin cleanser.

Example 15 was an excellent oily skin cleanser in terms of “familiarity with sunscreen (= cleanability)” and “no stickiness after cleaning”.

Claims (4)

The following components (a) to (b);
(A) and a paste-like or solid at solid polyethylene glycol (b) 25 ° C. at 25 ° C., a water-soluble silicone surfactant of HLB7 ~15,
The average molecular weight of the polyethylene glycol of the component (a) is 5,000 to 50,000,
The water-soluble silicone surfactant of the component (b) is a polyoxyethylene / methylpolysiloxane copolymer,
A water-soluble scrub agent characterized by that. Components (a) and mixing mass ratio of component (b) (a) :( b ) = 1: 9~9: soluble scrubbing agent according to claim 1 Symbol mounting characterized in that it is a 1. An oily skin cleanser comprising the water-soluble scrub agent according to claim 1 or 2 . The oily skin cleanser according to claim 3, further comprising powder as component (c).