JP3778327B2 - Method for producing oil-in-water emulsified cosmetic - Google Patents

Description

＜製造方法＞
油相の各成分を合わせ、７５℃で均一に溶解した。一方、水相の各成分を溶解し７５℃に加熱調整し、この水相をホモミキサー（特殊機化工業：T.K.ホモミクサー）を用い８０００ｒｐｍで攪拌させながら先に調製した油相を徐々に添加し乳化した後、さらに同回転数で１５分間処理し粗乳化物約２ｋｇを調製した。
▲２▼微粒子化処理によるエモリエントローションの調製
上記で得られた粗乳化物を脱気後、直ちにＤｅＢＥＥ２０００を用い圧力３００００ｐｓｉで２回微粒子化処理を施し水中油型のエモリエントローションを調製した。
得られたエモリエントローションは、乳化物の平均粒子径が１０２ｎｍであり、最大粒子径が４４０ｎｍであった。
【００２０】
【試験例】
試験例１
試験方法
実施例１の粗乳化物を用い、その後の微粒子化処理において、処理圧力、処理回数を変え表１に示す平均粒子径及び最大粒子径の水中油型乳化化粧料を調製した。
上記の各乳化化粧料の使用感及び肌荒れ改善効果を評価するため、肌荒れに悩む女性パネル２０名に実施例１の粗乳化物（対照品）を１ヵ月間使用させ、その後、微粒子化処理を施した各乳化化粧料を１ヵ月間使用させ、対照品と比較しどの程度使用感及び肌荒れ改善効果に優れているか評価させた。
尚、対照品は、粗乳化物をさらにパドルミキサーを用い１００ｒｐｍで攪拌させながら冷却したものを用いた。また、粒子径の測定は下記の条件で行った。
粒度分布分析装置：ＮＩＣＯＭＰ Model370(Pacific Scientific製）
測定モード ：Solid Particles （体積換算）
積算時間 ：１０分以上
Residual ：２．０以下
【００２１】
【表１】

【００２２】
表１より、平均粒子径が２００ｎｍ以下であり、かつ最大粒子径が７００ｎｍ以下である本発明品は、殆どのパネラーが使用感において、非常にさっぱりしている、あるいは、さっぱりしているとの評価であり、また、肌荒れ改善効果において、優れている、あるいは、やや優れているとの評価であった。特に、平均粒子径が１２０ｎｍ以下であり、かつ最大粒子径が５００ｎｍ以下である本発明品Ｎｏ．１及びＮｏ．２は、殆どのパネラーが使用感において、非常にさっぱりしているとの評価であり、また肌荒れ改善効果においも、優れているとの評価であった。
これより、本発明で得られる水中油型乳化化粧料は、さっぱりした使用感を有し、しかも、油分のエモリエント効果を充分に発揮させ、肌荒れ改善効果に優れていることが理解される。
【００２３】
【発明の効果】
以上述べたように、本発明によれば、従来の製造方法で得られ難かったさっぱりした使用感を有し、しかも、油分のエモリエント効果を充分に発揮できる水中油型乳化化粧料を提供できることから、乳化化粧料の使用拡大が期待される。
【００２４】
【図面の簡単な説明】
【図１】本発明の微粒子化原理を説明するための側断面図である。
【図２】図１のＡ−Ａ矢視の横断面図である。
【符号の説明】
１ 粗乳化物
２ ノズル
３ ジェット流
４ 底面
５ 側壁
６ 逆流
７ 界面[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for producing a novel oil-in-water emulsified cosmetic material that has a refreshed feeling of use and that sufficiently exhibits an emollient effect of oil and has an excellent effect of improving rough skin.
[0002]
[Prior art]
Conventionally, oil-in-water emulsified cosmetics have been manufactured by a method of emulsifying with an emulsifier such as a homomixer while adding the oil phase to the aqueous phase after heating and dissolving each component of the aqueous phase and the oil phase. .
[0003]
However, the oil-in-water emulsified cosmetics obtained by the conventional production method tend to have a sticky feeling, and because the emollient effect inherent in the oil cannot be sufficiently exhibited, It was still not satisfactory.
[0004]
[Problems to be solved by the invention]
Accordingly, an object of the present invention is to provide a method for producing an oil-in-water emulsified cosmetic that has a refreshed feeling of use and that sufficiently exhibits the emollient effect of oil and has an excellent effect of improving rough skin. To do.
[0005]
[Means for Solving the Problems]
As a result of intensive studies to achieve the above object, the present inventors have completed the present invention. That is, the present invention provides (1) a method for producing an oil- in- water emulsified cosmetic, in which a crude emulsion of the oil- in- water emulsified cosmetic is jetted as a single jet stream, When the coarse emulsion is atomized by the shearing force generated at the interface between the jet flow and the reverse flow by changing the direction of the jet flow and backflowing along the side wall so as to wrap the jet flow , the average particle diameter The method for producing an oil-in-water emulsified cosmetic, wherein the treatment is performed while adjusting the treatment pressure and / or the number of treatments so that the maximum particle size is 700 nm or less .
(2) When performing the micronization treatment, the treatment pressure and / or the number of treatments of the micronization treatment so that the average particle size of the oil- in- water emulsion cosmetic is 50 to 200 nm and the maximum particle size is 200 to 700 nm. The method for producing an oil-in-water emulsified cosmetic according to claim 1, which is carried out while adjusting the pH.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described in detail below. In the present invention, “%” is all “% by weight”, and all the particle diameters are particle diameters by “volume conversion”.
In the present invention, the “oil-in-water emulsified cosmetic” is an emulsified cosmetic in which the continuous phase is water and the disperse phase is oil, and is usually referred to as emollient lotion or emollient cream containing 10 to 50% of oil. A fee. In addition, since the emulsified cosmetic with less oil content than 10% has a relatively refreshing feeling of use, it is not included in the oil-in-water emulsified cosmetic of the present invention.
[0007]
In the emulsified cosmetic of the present invention, in addition to oil and water, raw materials usually used in emulsified cosmetics, for example, surfactants, moisturizers, thickeners, preservatives, antioxidants, chelating agents, pH adjusters , Fragrances, vitamins, ultraviolet absorbers, amino acids and the like can be blended.
[0008]
Specifically, the oil component includes vegetable oils such as castor oil, olive oil, cacao oil, palm oil, jojoba oil, avocado oil, animal oils such as mink oil, egg yolk oil, beeswax, lanolin, carnauba wax, candelilla wax, etc. Waxes, liquid paraffin, squalane, microcrystalline wax, ceresin wax, paraffin wax, petroleum oils such as petrolatum, fatty acids such as lauric acid, myristic acid, stearic acid, oleic acid, isostearic acid, behenic acid, Higher alcohols such as cetanol, stearyl alcohol, hexyldecanol, octyldodecanol, lauryl alcohol, isopropyl myristate, isopropyl palmitate, isopropyl adipate, octyldodecyl myristate, cetyl isooctanoate, oleate Chirudodeshiru, ester oils such as cholesterol oleate, silicone oils and the like.
[0009]
Surfactants include glycerin monostearate, polyglycerin monostearate, sorbitan monostearate, polyethylene glycol monostearate, polyoxyethylene sorbitan monooleate, polyoxyethylene cetyl ether, polyoxyethylenated sterol, polyoxy Nonionic surfactants such as ethylenated lanolin, polyoxyethylenated beeswax, polyoxyethylene hydrogenated castor oil, sodium stearate, potassium palmitate, triethanolamine palmitate, sodium polyoxyethylene lauryl phosphate, N-acyl glutamic acid Anionic surfactants such as sodium, cationic surfactants such as stearyldimethylbenzylammonium chloride and stearyltrimethylammonium chloride, phospholipids, etc. Amphoteric surfactants, and the like.
[0010]
Examples of humectants include glycerin, propylene glycol, 1,3-butylene glycol, sorbitol, polyglycerin, polyethylene glycol, dipropylene glycol and other polyhydric alcohols, amino acids, NMF components such as sodium pyrrolidonecarboxylate, sodium hyaluronate, chondroitin Examples thereof include water-soluble polymer substances such as sodium acid, collagen, and elastin.
[0011]
Examples of the thickener include xanthan gum, tragacanth gum, starch, methylcellulose, hydroxyethylcellulose, carboxymethylcellulose, cationized aerulose, carboxyvinyl polymer, polyvinyl alcohol and the like.
[0012]
Moreover, as a preservative, dehydroacetate, benzoate, paraoxybenzoate, sorbate, hinokitiol, ethanol, etc., as an antioxidant, dibutylhydroxytoluene, butylhydroxyanisole, ascorbic acid, etc., as a chelating agent Is disodium edetate, ethylenediaminetetraacetate, pyrophosphate, hexametaphosphate, etc. pH adjusters include sodium hydroxide, potassium hydroxide, triethanolamine, boric acid, borax, potassium hydrogen phosphate, etc. As an ultraviolet absorber, vitamins such as 2-hydroxy-4-methoxybenzophenone, octyldimethylparaaminobenzoate, P-methoxycinnamic acid-2-ethylhexyl, 4-tert-butyl-4-methoxy-dibenzoylmethane, etc. Is bitami A, vitamin B group, vitamin C, vitamin D, vitamin E, vitamin F, vitamin K, vitamin P, vitamin U, carnitine, ferulic acid, γ-oryzanol, α-lipoic acid, orotic acid, and derivatives thereof, etc. Examples include glycine, alanine, leucine, isoleucine, phenylalanine, tryptophan, cystine, cysteine, methionine, proline, hydroxyproline, aspartic acid, glutamic acid, arginine, histidine, lysine, and derivatives thereof. In addition, the said raw material is not limited to these.
[0013]
In the present invention, the term “coarse emulsion” refers to an emulsion before being subjected to the micronization treatment, and its production method is not particularly limited, but a method for producing a general oil-in-water emulsion described later, etc. Is mentioned.
[0014]
Further, in the present invention, “the crude emulsion is jetted as a single jet stream, the jet stream is redirected at the oppositely disposed bottom surfaces, and the jet stream is reversely flowed along the side wall so as to wrap around the jet stream. "The coarse emulsion is subjected to a micronization process by a shearing force generated at the interface between the jet flow and the reverse flow" is a commercially available micronizer B. E. E. The treatment of the crude emulsion obtained by the above method or the like with DeBEE2000 manufactured by International Ltd. or an apparatus equivalent thereto.
Hereinafter, the principle of fine particle formation will be described with reference to FIGS.
The coarse emulsion 1 is jetted from the nozzle 2 as a single jet stream 3, the jet stream 3 is redirected at the oppositely arranged bottom surface 4, and the flow is reversed along the side wall 5 so as to wrap the jet stream 3. Thus, the coarse emulsion is finely divided by the shearing force generated at the interface 7 between the jet stream 3 and the backflow 6.
[0015]
In the present invention, “an emulsion having an average particle size of 200 nm or less and a maximum particle size of 700 nm or less” is a commercially available particle size distribution analyzer for the particle size of the emulsion obtained by the production method of the present invention. An average particle size of 200 nm or less and a maximum particle size of 700 nm or less as measured by NICOM COMP Model 370 manufactured by Pacific Scientific or a similar device. Thus, an oil-in-water emulsified cosmetic that has a refreshing feeling of use and that sufficiently exhibits the emollient effect of the oil and is excellent in the effect of improving rough skin can be obtained. In particular, those having an average particle size of 120 nm or less and a maximum particle size of 500 nm or less are more preferable because of their excellent effects.
The oil-in-water emulsified cosmetic having an average particle size smaller than 50 nm and a maximum particle size smaller than 200 nm is difficult to actually produce on an industrial scale including the production method of the present invention. The oil-in-water emulsified cosmetic obtained by this production method has an average particle size of 50 to 200 nm and a maximum particle size of 200 to 700 nm.
[0016]
The oil-in-water emulsified cosmetic obtained by the production method of the present invention has a refreshing feeling for use for whatever reason, and it is not certain that the emollient effect of oil is sufficiently exerted and the effect of improving rough skin is excellent. However, by controlling the average particle size and the maximum particle size according to the principle of fine particle formation of the present invention, it is presumed that the affinity to the skin was improved and such an effect was produced.
[0017]
Although the typical manufacturing method of this invention is demonstrated below, it does not specifically limit to this manufacturing method in particular.
(1) Method for producing crude emulsion 70 to 80 ° C. Combined oil (10 to 50%), surfactant (0.5 to 7%), preservative (trace), and other oil phase components The solution is uniformly heated and dissolved to obtain an oil phase. On the other hand, a moisturizer (0 to 10%) and other water-soluble components are dissolved in purified water (balance) and heated to 70 to 80 ° C. to obtain an aqueous phase. While stirring the aqueous phase with an emulsifier such as a homomixer at 2500 to 15000 rpm, the oil phase prepared above is gradually added to emulsify, or the oil phase is stirred at 100 to 500 rpm with an agitator such as a paddle mixer. While stirring, the aqueous phase is gradually added to phase-invert and emulsify, and if necessary, a crude emulsion is produced by treating at 2500 to 15000 rpm for several minutes to 1 hour using an emulsifier such as a homomixer.
[0018]
(2) Method for producing oil-in-water emulsified cosmetic by micronization treatment The crude emulsion obtained by the above production method is degassed as necessary and then micronized using the micronization principle of the present invention. Using an apparatus such as DeBEE 2000, which is a commercial product, treatment is performed once or several times at a pressure of 20000 psi or more, preferably 30000 psi or more, so that the average particle size is 200 nm or less and the maximum particle size is 700 nm or less.
[0019]
Next, the present invention will be described in more detail based on examples and test examples.
【Example】
Example 1 (emollient lotion)
(1 ) Preparation of crude emulsion A crude emulsion was prepared according to the following formulation and production method.

<Manufacturing method>
The components of the oil phase were combined and dissolved uniformly at 75 ° C. On the other hand, each component of the aqueous phase is dissolved and heated to 75 ° C., and the oil phase prepared above is gradually added while stirring the aqueous phase at 8000 rpm using a homomixer (Special Machine Industries: TK homomixer). After emulsification, the mixture was further treated at the same rotational speed for 15 minutes to prepare about 2 kg of a coarse emulsion.
(2) Preparation of emollient lotion by micronization treatment After degassing the crude emulsion obtained above, it is immediately subjected to micronization treatment with DeBEE2000 twice at a pressure of 30000 psi to prepare an oil-in-water emollient lotion. did.
The obtained emollient lotion had an average particle size of the emulsion of 102 nm and a maximum particle size of 440 nm.
[0020]
[Test example]
Test example 1
Test Method Using the crude emulsion of Example 1, in the subsequent micronization treatment, the treatment pressure and the number of treatments were changed to prepare oil-in-water emulsion cosmetics having the average particle size and the maximum particle size shown in Table 1.
In order to evaluate the feeling of use and the rough skin improvement effect of each of the emulsified cosmetics described above, 20 female panels suffering from rough skin were allowed to use the coarse emulsion of Example 1 (control product) for 1 month, and then subjected to micronization treatment. Each emulsified cosmetic applied was used for 1 month, and it was evaluated to what extent it was superior to the control product in terms of usability and rough skin.
In addition, the control | contrast goods used what cooled the coarse emulsion further, stirring at 100 rpm using a paddle mixer. The particle diameter was measured under the following conditions.
Particle size distribution analyzer: NICOMP Model370 (Pacific Scientific)
Measurement mode: Solid Particles (volume conversion)
Total time: 10 minutes or more
Residual: 2.0 or less [0021]
[Table 1]

[0022]
From Table 1, it can be said that most of the panelists in the present invention having an average particle size of 200 nm or less and a maximum particle size of 700 nm or less are very refreshing or refreshing in use feeling. It was an evaluation and an evaluation that it was excellent or somewhat excellent in the effect of improving rough skin. In particular, the product No. 1 of the present invention having an average particle size of 120 nm or less and a maximum particle size of 500 nm or less. 1 and no. No. 2 is an evaluation that most panelists are very refreshed in the feeling of use, and that the effect of improving rough skin is also excellent.
From this, it is understood that the oil-in-water type emulsified cosmetic obtained by the present invention has a refreshing feeling of use, exhibits a sufficient emollient effect of oil, and is excellent in rough skin improvement effect.
[0023]
【The invention's effect】
As described above, according to the present invention, it is possible to provide an oil-in-water emulsified cosmetic that has a refreshing feeling that is difficult to obtain by the conventional production method and that can sufficiently exhibit the emollient effect of oil. The use of emulsified cosmetics is expected to expand.
[0024]
[Brief description of the drawings]
FIG. 1 is a side sectional view for explaining the principle of atomization of the present invention.
2 is a cross-sectional view taken along the line AA in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Coarse emulsion 2 Nozzle 3 Jet flow 4 Bottom surface 5 Side wall 6 Backflow 7 Interface

Claims (2)

In the method for producing an oil- in- water emulsified cosmetic, a crude emulsion of the oil- in- water emulsified cosmetic is jetted as a single jet stream, the jet stream is redirected at the bottom face disposed oppositely, and the jet When the coarse emulsion is atomized by the shearing force generated at the interface between the jet flow and the reverse flow by backflow along the side wall so as to wrap the flow , the average particle diameter is 200 nm or less and the largest particle A method for producing an oil-in-water emulsified cosmetic, wherein the treatment is performed while adjusting the treatment pressure and / or the number of treatments of the microparticulation treatment so that the diameter is 700 nm or less . When performing the micronization treatment, the treatment pressure and / or the number of treatments of the micronization treatment are adjusted so that the average particle size of the oil- in- water emulsion cosmetic is 50 to 200 nm and the maximum particle size is 200 to 700 nm. The method for producing an oil-in-water emulsified cosmetic according to claim 1, wherein

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