Water-in-oil emulsion cosmetic

Abstract

This invention provides a water-in-oil emulsion cosmetic that does not contain volatile oils, does not feel sticky like non-volatile oils when applied, provides a high degree of adhesion to the skin and long-lasting makeup film, and has a smooth, easy-to-spread texture. [Solution] The following components (A) to (C); Component (A): Modified silicone oil having a silicone dendron group in the siloxane skeleton. Ingredient (B) Film-forming agent 2.0-6.0% Component (C) 15.0-25.0% non-volatile silicone oil, excluding component (A) A water-in-oil emulsion cosmetic containing the following ingredients.

Description

Technical Field

[0001] An object of the present invention is to provide a water-in-oil type emulsified cosmetic that does not feel sticky like a non-volatile oil agent during application even without containing a volatile oil agent, has excellent adhesion to the skin and durability of the cosmetic film, and has a good feeling of use with good elongation.

Background Art

[0002] Water-in-oil type emulsified cosmetics have an oil phase as the continuous phase and an aqueous phase as the dispersed phase, and are applied to a wide range of cosmetics such as base cosmetics, makeup cosmetics, and hair cosmetics because of their excellent water repellency and adhesiveness. However, on the other hand, since the oil exists in the continuous phase compared to oil-in-water type emulsified cosmetics, there is a drawback that it tends to feel sticky.

[0003] In order to solve such problems, techniques such as eliminating stickiness by using a volatile silicone oil, or obtaining a smooth and good-spreading cosmetic by containing an organosilicon resin powder, a non-volatile silicone oil, and a film-forming agent in a specific ratio have been used. (Patent Documents 1, 2)

[0004] However, in recent years, regulations on volatile silicone oils and organosilicon resin powders have been progressing in Europe and other regions due to concerns about environmental impact, and it is highly likely that regulations will also progress in the future in Japan. Therefore, their use is being restricted or alternatives are being considered. There is also a method of using a volatile hydrocarbon oil as a volatile oil agent to replace the volatile silicone oil to eliminate stickiness, but cracks or dents may occur in the container due to the inclusion of the volatile hydrocarbon oil. For these reasons, the development of a water-in-oil type emulsified cosmetic that does not feel sticky without containing a volatile oil agent is desired.

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] The present invention aims to provide a water-in-oil emulsion cosmetic that does not contain volatile oils, does not feel sticky when applied as is characteristic of non-volatile oils, has excellent adhesion to the skin and durability of the cosmetic film, and has a smooth, easy-to-spread feel. [Means for solving the problem]

[0006] As a result of diligent research, the inventors of this invention have discovered that, even without containing volatile oils, by including the following components (A), (B), and (C), it is possible to obtain a water-in-oil emulsion cosmetic that does not have the stickiness characteristic of non-volatile oils when applied to the skin, exhibits excellent adhesion to the skin and durability of the cosmetic film, and has a smooth, easy-to-spread feel. This led to the completion of the present invention. In other words, the present invention is: The following components (A) to (C); Component (A): Modified silicone oil having a silicone dendron group in the siloxane skeleton. Ingredient (B) Film-forming agent 2.0-6.0% Component (C) 15.0-25.0% non-volatile silicone oil, excluding component (A) This is a water-in-oil emulsion cosmetic containing [ingredient name]. [Effects of the Invention]

[0007] The present invention makes it possible to provide a water-in-oil emulsion cosmetic that does not contain volatile oils, does not feel sticky when applied as is characteristic of non-volatile oils, has excellent adhesion to the skin and durability of the cosmetic film, and has a smooth, easy-to-spread feel. [Modes for carrying out the invention]

[0008] The present invention will be described in detail below. In this specification, "~" indicates a range including the numbers before and after it. Also, % indicates mass %.

[0009] The component (A) siloxane skeleton used in the present invention refers to a silicone chain, and examples include dimethicone and methylhydrogenpolysiloxane. The length of the silicone chain is not particularly limited and can be any size commonly used in cosmetics. Silicone dendron groups are preferably present as side chains of the siloxane skeleton, which is the main chain. Specific examples of component (A) in the present invention include lauryl PEG-10 tris(trimethylsiloxy)silylethyl dimethicone and cetyl diglyceryl tris(trimethylsiloxy)silylethyl dimethicone. Commercially available products include DOWSIL ES-5300 Formulation Aid (manufactured by Dow-Toray Industries, Inc.), DOWSIL ES-5600 Silicone Glycerol Emulsifier (manufactured by Dow-Toray Industries, Inc.), and DOWSIL ES-5700 Formulation Aid (manufactured by Dow-Toray Industries, Inc.). One or more of these can be used as needed.

[0010] Furthermore, the content of component (A), modified silicone oil having a silicone dendron group in the siloxane skeleton, is not particularly limited and can be adjusted as appropriate according to the desired feel. However, from the viewpoint of adhesion to the skin, lack of stickiness, and good spreadability, 0.1 to 3.0% is preferred in the cosmetic. More preferably, it is 0.5 to 1.5%. If the modified silicone oil having a silicone dendron group in the siloxane skeleton is not included, the adhesion and spreadability upon application will be weak, and a sticky feeling will be felt.

[0011] The film-forming agent (B) used in the present invention is not particularly limited as long as it is commonly used in cosmetics, and any of them can be used. Examples include dextrin isostearate, trimethylsiloxysilicate, alkyl(C30-45)dimethylsilylpolypropylsilsesquioxane, acrylates copolymer, etc., and one or more of these can be used as needed. Among these, trimethylsiloxysilicate or dextrin isostearate is preferred in terms of solubility in the contained oil and adhesion to the skin. A commercially available product of trimethylsiloxysilicate is BELSIL TMS 803 SILICONE RESIN (manufactured by Asahi Kasei Wacker Silicone Co., Ltd.), and a commercially available product of dextrin isostearate is Unifilma HVY (manufactured by Chiba Flour Milling Co., Ltd.).

[0012] Furthermore, the amount of film-forming agent in ingredient (B) should be 2.0-6.0% in the cosmetic product, with a preferred amount being 3.5-5.5%, considering factors such as adhesion to the skin and the durability of the cosmetic film. If the amount is less than 2.0%, the adhesion to the skin will be poor, and the durability of the cosmetic film will not be achieved. If the amount is more than 6.0%, the adhesion will be too strong, resulting in stickiness and a squeaky feeling.

[0013] The non-volatile silicone oil component (C) used in the present invention is at room temperature (25°C) and normal pressure (1 atmosphere, i.e., 1.013 × 10⁻¹⁰). 5This refers to silicone oil that does not volatilize at Pa), and any non-volatile silicone oil commonly used in cosmetics can be used without particular restrictions, except for component (A). Silicone surfactants such as polyether-modified silicone oil are not included in non-volatile silicone oils. Examples of non-volatile silicone oils include dimethicone, diphenylsiloxyphenyl trimethicone, amodimethicone, dimethiconol, phenyl trimethicone, and diphenylsiloxyphenyl trimethicone, all of which have a kinematic viscosity of 6 cs or higher. One or more of these can be used as needed. Among these, dimethicone with a kinematic viscosity of 30 cs or lower and diphenylsiloxyphenyl trimethicone, which is a phenyl-modified silicone oil, are preferred due to their solubility in the contained oils and their good compatibility with the skin. Commercial dimethicone products include KF-96A-6cs (manufactured by Shin-Etsu Chemical Co., Ltd.), and commercial diphenylsiloxyphenyl trimethicone products include KF-56A (manufactured by Shin-Etsu Chemical Co., Ltd.).

[0014] Furthermore, the content of non-volatile silicone oil in component (C) should be 15.0-25.0% from the perspective of a smooth, spreadable feel, with 18.0-22.0% being more preferable. If it is less than 15.0%, the smooth, spreadable feel will be compromised. If it is more than 25.0%, it will feel sticky and the durability of the cosmetic film will be reduced.

[0015] In addition to the essential components mentioned above, the water-in-oil emulsion cosmetic composition of the present invention may contain various components, such as powders, surfactants, oils, UV absorbers, preservatives, humectants, thickeners, colorants, antioxidants, cosmetic ingredients, fragrances, cooling agents, pH adjusters, etc., as appropriate, depending on the intended use, provided that the effects of the invention are not impaired. Furthermore, powders such as colorants may be surface-treated with treatment agents such as fluorine compounds, silicone compounds, surfactants, fatty acids, and waxes before use.

[0016] The present invention provides for water-in-oil emulsion cosmetics such as liquid foundations, cream foundations, makeup bases, and sunscreens, and can be used by hand or with an applicator such as a puff, brush, sponge, or tip. Furthermore, the water-in-oil emulsion cosmetic of the present invention is suitable for foundations that are impregnated into an impregnating body and applied using an applicator, as it provides high adhesion to the skin and good spreadability even when an applicator is used.

[0017] The present invention involves impregnating an impregnating body with a water-in-oil emulsion cosmetic and applying it to the skin using an applicator. Examples of impregnating bodies include nonwoven fabrics made of cotton or pulp, and foamed sponges made of NBR (acrylonitrile butadiene rubber), NR (natural rubber), PVA (polyvinyl alcohol), urethane, nylon, polyester, EVA, or silicone. However, the impregnating body is not limited to these materials as long as it can contain the cosmetic. The cosmetic is impregnated into the impregnating body contained in a compact container, and the user presses a puff, sponge, tip, or brush onto the impregnating body to adhere the cosmetic, and then presses the cosmetic attached to the applicator onto the skin for use. [Examples]

[0018] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples. Unless otherwise specified, the content is given in mass percent.

[0019] (Examples 1-20 and Comparative Examples 1-8) Impregnated Liquid Foundation The water-in-oil emulsion cosmetic of the present invention will be explained using Examples 1-20 and Comparative Examples 1-8. The water-in-oil emulsion cosmetic of Examples 1-20 and Comparative Examples 1-8 was prepared, impregnated into a polyester sponge contained in a compact container, applied to the skin using a puff, and evaluated according to the evaluation method and evaluation criteria shown below.

[0020] (Evaluation of non-stickiness, adherence to skin, duration of makeup film, and ease of spreadability) Five cosmetic experts in their 20s to 40s were asked to evaluate the "stickiness", "adhesion to the skin", "persistence of the makeup film", and "good stretch" when applied, and scored according to the following evaluation criteria. The average score for each impregnated liquid foundation was calculated and judged according to the following judgment criteria. <Evaluation Criteria> 〔Evaluation〕 〔Score〕 Very good: 5 Good: 4 Average: 3 Somewhat poor: 2 Poor: 1 <Judgment Criteria> 〔Average score〕 〔Judgment〕 4.5 or more: ◎ 3.5 or more and less than 4.5: 〇 2.5 or more and less than 3.5: △ Less than 2.5: ×

[0021] From Examples 1 to 20 and Comparative Examples 1 to 8 shown in Tables 1 to 3, liquid foundations were prepared by the following production method and evaluated based on the above usage test method, evaluation items and evaluation criteria. The judgment results are also shown in Tables 1, 2 and 3.

[0022] (Production Method) Components 1 to 11 were uniformly dispersed. Then, components 12 to 15 were added and further dispersed. Components 16 to 19 were added to the mixture of components 1 to 15, emulsified using a homomixer, and then defoamed to prepare.

[0023]

Table 1

[0024] As shown in Table 1, Examples 1-7 performed well in all evaluation items. Among them, Examples 1-3, which contained 0.5-1.5% of ingredient (A), performed exceptionally well in all items. Comparative Examples 1 and 2, which did not contain ingredient (A), were very sticky and did not provide good adhesion to the skin.

[0025] [Table 2]

[0026] As shown in Table 2, Examples 8-15 performed well in all evaluation items. Among them, Examples 8-12, which contained 3.5-5.5% of one or both trimethylsiloxysilicate and dextrin isostearate as component (B), performed very well in all items. Comparative Example 4, which contained more than 6.0% of component (B), was deemed unsatisfactory due to excessive stickiness and adhesion to the skin upon application. Comparative Examples 3 and 5, which contained less than 2.0% of component (B), were deemed unsatisfactory due to poor adhesion to the skin and poor durability of the cosmetic film. [Table 3]

[0027] As shown in Table 3, Examples 16-20 performed well in all evaluation items. Among them, Examples 16-18, which contained 18.0-22.0% of component (C), performed exceptionally well in all items. Comparative Examples 6 and 8, which contained less than 15.0% of component (C), and Comparative Example 7, which contained more than 25% of component (C), showed poor spreadability during application and poor durability of the cosmetic film, resulting in a poor evaluation.

[0028] Other embodiments of the present invention are shown below. In all of these embodiments, excellent results were obtained in all evaluation items.

[0029] (Example 21) Water-in-oil emulsion makeup base (Ingredients) (%) 1. Cetyl diglyceryl tris(trimethylsiloxy)silylethyl dimethicone 1.0 2. Trimethylsiloxysilicate 4.0 3. Dimethicone (6cs) 10.0 4. Phenylentrimethicone 10.0 5. Hydrogenated polyisobutene residue 6. PEG-10 Dimethicone 2.0 7. Ethylhexyl Methoxycinnamate 4.0 8. Silica 2.0 9. Talc 2.0 10. Dimethylsilylated silica 0.3 11. Titanium dioxide 5.0 12. Iron oxide 2.0 13. Methylparaben 0.2 14.Wednesday 23.0 15. Ethanol 3.0

[0030] (Manufacturing method) Components 1-7 were uniformly dispersed. Then, components 8-12 were added and further dispersed. Components 13-15 were added to the mixture of components 1-12, emulsified using a homomixer, and then defoamed to obtain a water-in-oil emulsion makeup base. The resulting makeup base was non-sticky upon application, had high adhesion to the skin, excellent durability of the makeup film, and spread easily.

[0031] (Example 22) Water-in-oil emulsion sunscreen cosmetic (Ingredients) (%) 1. Cetyl diglyceryl tris(trimethylsiloxy)silylethyl dimethicone 1.5 2. Trimethylsiloxysilicate 5.0 3. Dimethiconol 22.0 4. PEG-10 Dimethicone 2.0 5. Octocrylene 4.0 6. Ethylhexyl Methoxycinnamate 3.0 7. Hydrogenated polyisobutene residue 8. Silica 2.0 9. Dimethylsilylated silica 0.3 10. Titanium dioxide 16.0 11. Iron oxide 2.0 12. Methylparaben 0.2 13.Wednesday 23.0 14. Ethanol 1.5

[0032] (Manufacturing method) Components 1-7 were uniformly dispersed. Then, components 8-11 were added and further dispersed. Components 12-14 were added to the mixture of components 1-11, emulsified using a homomixer, and then defoamed to obtain a sunscreen cosmetic. The resulting sunscreen cosmetic was non-sticky upon application, had high adhesion to the skin, excellent durability of the cosmetic film, and spread easily.

[0033] (Example 23) Liquid foundation (Ingredients) (%) 1. Lauryl PEG-10 Tris(trimethylsiloxy)silylethyl dimethicone 0.8 2. Alkyl (C30-45) dimethylsilyl polypropyl silsesquioxane 3.0 3. Dextrin isostearate 1.0 4. Dimethicone (10cs) 16.0 5. Diphenylsiloxyphenyl trimethicone 3.0 6. Hydrogenated polyisobutene residue 7. PEG-10 Dimethicone 2.5 8. Octocrylene 4.0 9. Ethylhexyl Methoxycinnamate 3.0 10. Dimethylsilylated silica 0.3 11. Titanium dioxide 19.0 12. Iron oxide 2.0 13. Methylparaben 0.2 14.Wednesday 23.0 15. Ethanol 1.5 16. BG 5.0 (Manufacturing method) Components 1-9 were uniformly dispersed. Then, components 10-12 were added and further dispersed. Components 13-16 were added to the mixture of components 1-12, emulsified using a homomixer, and then degassed to obtain a liquid foundation. The resulting liquid foundation was non-sticky upon application, had high adhesion to the skin, excellent durability of the makeup film, and spread easily. [Industrial applicability]

[0034] According to the present invention, even without containing volatile oils, by including a modified silicone oil having a silicone dendron group in the siloxane skeleton, 2.0-6.0% of a film-forming agent, and 15.0-25.0% of non-volatile silicone oil, it is possible to develop a water-in-oil emulsion cosmetic that does not feel sticky when applied, has excellent adhesion to the skin and durability of the cosmetic film, and has a smooth, easy-to-spread feel.

Claims

1. The following components (A) to (C); Component (A): Modified silicone oil having a silicone dendron group in the siloxane skeleton. Component (B) Film-forming agent 2.0-6.0% Component (C) 15.0-25.0% non-volatile silicone oil excluding component (A) A water-in-oil emulsion cosmetic containing the following ingredients.

2. The water-in-oil emulsion cosmetic composition according to claim 1, characterized in that (A) the modified silicone oil having a silicone dendron group in the siloxane skeleton is cetyl diglyceryl tris(trimethylsiloxy)silylethyl dimethicone, (B) the film-forming agent is one or two selected from trimethylsiloxysilicate and dextrin isostearate, and (C) the non-volatile silicone oil is one or two selected from dimethicone and diphenylsiloxyphenyl trimethicone with a kinematic viscosity of 30 cs or less.

3. The water-in-oil emulsion cosmetic according to claim 1 or 2, characterized by being impregnated into an impregnating body and used with an applicator.

4. The water-in-oil emulsion cosmetic composition according to claim 1 or 2, characterized in that it does not contain a volatile oil agent.

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