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JP3655720B2 - Emulsified composition - Google Patents
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JP3655720B2 - Emulsified composition - Google Patents

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JP3655720B2
JP3655720B2 JP33897196A JP33897196A JP3655720B2 JP 3655720 B2 JP3655720 B2 JP 3655720B2 JP 33897196 A JP33897196 A JP 33897196A JP 33897196 A JP33897196 A JP 33897196A JP 3655720 B2 JP3655720 B2 JP 3655720B2
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Prior art keywords
emulsified
type
acid
meth
emulsifier
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JP33897196A
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JPH10167927A (en
Inventor
茂昭 田村
憲一 鹿山
百世 吉田
麻子 森田
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Fancl Corp
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Fancl Corp
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Description

【0001】
【発明の属する技術分野】
本発明は主として化粧料として用いられる乳化組成物に関する。さらに詳しくは、製造・保存時はO/W型であって、肌に塗布して摩擦したときにW/O型に相転移する乳化組成物に関する。
【0002】
【従来の技術】
化粧料には各種の油性成分と水性成分が多く用いられており、乳化して化粧料とする場合が多い。乳化のタイプとしては油性成分が水性分散媒中に乳化分散しているO/W型と、逆に水性成分が油性成分中に乳化分散しているW/O型がある。
【0003】
O/W型の乳化化粧料は取り扱い性には優れるが、汗や水により流れ落ちやすい、水分が蒸発しやすい等の欠点がある。一方、W/O型の乳化化粧料は水や汗によって流れ落ちることがなく、また肌の水分の蒸発を適度に保ってくれるという長所があるが、肌に適用したときに重くべたつきが感じられ使用感が劣る、衣服に付着すると落ちにくくシミになりやすい、製造現場では製造容器や充填機等の洗浄がしにくい等の問題点がある。
【0004】
【発明が解決しようとする課題】
本発明の目的はO/W型とW/O型の持つ欠点を解消し、両者の長所を合わせもつ乳化組成物を提供することである。
【0005】
【課題を解決するための手段】
本発明者はO/W型の長所は主として肌に塗布して摩擦する使用の段階までに発揮され、それ以降は主として欠点が表れること、逆にW/O型の長所は主として肌に適用後のことであり、それ以前は主として欠点が多いことに着目した。そして、肌に適用するまではO/W型であり、適用後はW/O型に相転移するような乳化物であれば上記の問題点の解決になるのではないかと考えた。そしてこの様な相転移を起こさせることが可能な組成物の配合について鋭意検討を行った結果、ある特定の重合体を含有する乳化組成物が上記のような相転移を起こすことを見出し、本発明を完成した。
【0006】
即ち、本発明の第一はオレフィン性不飽和カルボン酸−(メタ)アクリル酸アルキルエステル共重合体を含有し、油性成分が水性成分中にO/W型に乳化されており、人間の肌に塗布して摩擦したときにW/O型に相転移することを特徴とする乳化組成物である。本発明の第二はオレフィン性不飽和カルボン酸−(メタ)アクリル酸アルキルエステル共重合体を含有し、O/W型に乳化された油性成分の乳化粒子とO/W型に乳化されたW/O型乳化剤の乳化粒子が混在してなる乳化組成物である。
【0007】
【発明の実施の形態】
以下、本発明を詳細に説明する。
本発明の乳化組成物は使用される以前の状態では油性成分の乳化粒子とW/O型乳化剤の乳化粒子が媒体である水性成分中に混在した組成物である。油性成分の乳化粒子にはW/O型乳化剤が少量溶け込んでいても差し支えない。またW/O型乳化剤粒子には油性成分が少量溶け込んでいてもよいが、大部分はW/O型乳化剤である必要があり、実質的に油性成分が存在しないことが好ましい。オレフィン性不飽和カルボン酸−(メタ)アクリル酸アルキルエステル共重合体は水性成分中に溶解して存在し、油性成分とW/O型乳化剤を安定に乳化させるかあるいは乳化粒子を安定化させていると考えられる。
【0008】
このような乳化組成物を肌に塗布して摩擦すると乳化は一旦破壊される。そして分散粒子となっていたW/O型乳化剤は乳化剤としての機能を発揮するようになり、更に摩擦を続けることにより油性成分が連続相となりそれまで連続相であった水性成分が独立乳化粒子となって、相転移が生じる。
【0009】
本発明におけるオレフィン性不飽和カルボン酸−(メタ)アクリル酸アルキルエステル共重合体は、例えば米国特許第3,915,921号に開示されているものであり、具体的商品としてビー・エフ・グッドリッチ社製のペムレンTR−1、ペムレンTR−2(商標)が例示できる。
【0010】
オレフィン性不飽和カルボン酸としては例えばアクリル酸、メタアクリル酸、エタアクリル酸、α−クロロアクリル酸、α−シアノアクリル酸、クロトン酸、α−フェニルアクリル酸、β−アクリロキシプロピオン酸、ソルビン酸、α−クロロソルビン酸、アンゲリカ酸、ケイ皮酸、p−クロロケイ皮酸、β−スチリルアクリル酸、イタコン酸、シトラコン酸、メサコン酸、グルタコン酸、アコニット酸、マレイン酸、無水マレイン酸、フマル酸、エチレントリカルボン酸等が挙げられる。好ましくはアクリル酸、メタアクリル酸、マレイン酸、無水マレイン酸である。これらは1種または2種以上用いることができる。オレフィン性不飽和カルボン酸の共重合体中の量は95〜50重量%が好ましい。
【0011】
(メタ)アクリル酸アルキルエステルのアルキル鎖長としては炭素数10〜30のものが好ましい。(メタ)アクリル酸アルキルエステルの具体例としてはデシル(メタ)アクリレート、ラウリル(メタ)アクリレート、ステアリル(メタ)アクリレート、ベヘニル(メタ)アクリレート、ミリスチル(メタ)アクリレート等が例示できる。これらは1種または2種以上用いることができる。(メタ)アクリル酸アルキルエステルの共重合体中の量は5〜50重量%が好ましい。
【0012】
不飽和カルボン酸−(メタ)アクリル酸アルキルエステル共重合体は、必要であれば架橋剤を用いて架橋してもよい。架橋剤としては例えば(メタ)アリル(メタ)アクリレート、ジアリルマロネート、ジビニルエーテル、グリコールジアクリレート、グリセリルトリアクリレート、ジビニルベンゼン、多価アルコールのポリアルケニルポリエーテル等が挙げられ、多価アルコールのポリアルケニルポリエーテルが好ましく、ポリアリルシュークロースが特に好ましい。架橋剤を使用する場合はその量は好ましくは共重合体中0.1〜6重量%である。
【0013】
上記共重合体は公知のラジカル重合で製造できる。好ましくは公知のラジカル触媒を使用して重合する。重合法としては特に制限はなく、塊状重合、懸濁重合、溶液重合、乳化重合、沈殿重合等が採用できる。好ましくはモノマーの少なくとも1種を溶解し得られる共重合体を実質的に溶解しない溶媒中で重合するのが好ましい。
本発明における上記共重合体の量は通常0.1〜5.0重量%、好ましくは0.2〜1重量%である。
【0014】
本発明のW/O型の乳化剤とは油性成分中に水性成分を乳化させる作用を有するものであり、従来W/O型の乳化剤として用いられているものを用いることができ、例えば常温で液状のもの、加温したとき液状となるもの、固体で油性溶媒に溶解するもの等がある。W/O型の乳化剤は化粧料に使用する場合は肌に悪影響を与えないことが重要である。好ましくはシリコン系乳化剤であり、特に好ましくはメチルポリシロキサン−セチルメチルポリシロキサン−ポリ(オキシエチレン・オキシプロピレン)メチルポリシロキサン共重合体のようなオルガノポリシロキサン骨格を持つポリマーである。W/O型の乳化剤の量は通常0.1〜10重量%、好ましくは0.5〜3重量%である。
【0015】
本発明に使用できる油性成分としては特に制限はない。例えば通常化粧料に用いられているものであれば好ましく使用できる。具体的には、ホホバ油、オリーブ油、マカデミアナッツ油等の植物油、ミツロウ、キャンデリラロウ、木ロウ等のロウ類、流動パラフィン、スクワラン等の炭化水素類、セタノール、ベヘニルアルコール等の高級アルコール類、パルミチン酸、ステアリン酸等の脂肪酸、乳酸ミリスチル、乳酸ステアリル、ジカプリン酸ネオペンチルアルコール、トリグリセライド等のエステル類、メチルポリシロキサン、高重合メチルポリシロキサン、架橋型メチルポリシロキサン、メチルシクロポリシロキサン、シリコン樹脂、シリコンジェリー等のシリコンオイル、パーフルオロポリエーテル、油溶性プラセンタンエキス、油溶性植物抽出エキス、カンゾウフラボノイド、グリチルレチン酸誘導体、セラミド、油溶性ビタミン類、油溶性アルコール、油溶性のパラオキシ安息香酸誘導体、油溶性の紫外線吸収剤等が例示できる。
油性成分の量は通常10〜60重量%、好ましくは15〜40重量%である。
【0016】
本発明においては当初連続層となり、その後分散層となる水性成分が必要である。水性成分は通常は水である。その他、各種添加剤で水に溶解して存在するものは本発明においては水性成分として扱う。例えばコラーゲン、加水分解コラーゲン、ヒアルロン酸、ヒアルロン酸ナトリウム、コンドロイチン硫酸ナトリウム、水溶性プラセンタンエキス、水溶性植物抽出エキス、エラスチン、加水分解エラスチンエキス、セイヨウブナノキエキス、グリチルリチン酸塩、水溶性ビタミン類、植物性疑似コラーゲン、植物性疑似プラセンタンエキス、水溶性アルコール、水溶性パラオキシ安息香酸塩、水溶性紫外線吸収剤等の化粧料に使用される水溶性の全ての成分を使用することができる。
水性成分の量は通常25〜89.8重量%、好ましくは60〜80重量%である。
【0017】
本発明においては、その他に乳化組成物を容易に乳化させ且つその安定性を高める等の目的で水性成分中に油性成分を乳化する作用を有するO/W型の乳化剤を(メタ)アクリル酸−(メタ)アクリル酸アルキルエステル共重合体と併用してもよい。O/W型の乳化剤としては、非イオン界面活性剤が好ましく、従来用いられている非イオン界面活性剤は全て用いることができるが、化粧料として用いる場合の悪影響がないことを考慮するとポリオキシエチレン硬化ヒマシ油、ポリオキシエチレンソルビタンモノステアレートの様なソルビタンの脂肪酸エステル等が好ましい。O/W型の乳化剤の量は好ましくは0.05〜5重量%である。
【0018】
本発明の乳化剤は例えば次のようにして製造できる。
先ず、オレフィン性不飽和カルボン酸−(メタ)アクリル酸アルキルエステル共重合体に必要に応じてO/W型の乳化剤を加え、これにアルカリを加えてよく攪拌し、さらに水を加える。水は同時に加えてもよい。アルカリを加えるのは、通常酸性側ではこの共重合体が十分溶解しないためであり、アルカリで中性ないしは酸性とすることにより十分に水溶性とする。アルカリとしてはアンモニウム、ナトリウム、カリウム等の1価アリカリ、カルシウム、マグネシウム等の多価アルカリの水酸化物、炭酸塩等が使用でき、1価アルカリが好ましく、苛性カリが特に好ましい。アルカリの量は通常共重合体が十分に溶解して水溶液となる様な量である。水は十分に精製した水が好ましい。次に、所定量の油性成分を加えてホモミキサー等で良く攪拌し、油性成分を乳化させる。最後に所定量のW/O型乳化剤を添加してホモミキサー等で良く攪拌し、乳化させる。
上記の製造法は一例であり必ずしもこれに限定されるものではなく、要は油性成分とW/O型乳化剤の両者をO/W型で乳化させるような方法であれば特に制限はない。
【0019】
この様にして製造した本発明の乳化組成物は、使用前は油性成分とW/O型乳化剤の両者がO/W型で存在している。従って、水相が連続相となっているため、衣服等に付着しても比較的落ちやすくシミになりにくい。製造現場においても製造装置や充填装置、保管装置等の洗浄がやりやすく、銘柄切り替え等が容易である。また化粧料として肌に塗布した場合は軽い感触が得られ、いわゆるのびもよい。そして肌に擦り込むと、そのときの摩擦力により、乳化が破壊される。それにより乳化粒子として存在していたW/O型の乳化剤が乳化機能を発揮し、逆にそれまで連続相であった水相を乳化し、油性成分が連続相になり、相転移して肌の上でW/O型の乳化形態なると考えられる。その結果、さらっとした使用感が得られ、水や汗等により流れることがほとんどない。
【0020】
本発明の乳化組成物は、手、爪、顔、首、その他全身の肌に適用する化粧料に全て用いることができる。具体的には乳液、クリーム、エッセンス、マッサージ料、日焼け用化粧料、日焼け止め化粧料、栄養クリーム、ハンドクリーム、リップクリーム、ファンデーション等のベースメイキャップ化粧料等に用いることができる。
【0021】
【実施例】
以下に本発明を実施例で説明するが、本発明はこれらに限定されないことはもちろんである。なお、以下の実施例、比較例において部、%は特記しない限り重量部、重量%である。
【0022】
実施例1
1Lのステンレス容器にペムレンTR−1(アクリル酸とアクリル酸アルキルエステルの共重合体、ビー・エフ・グッドリッチ社製)の1%分散液を30部、O/W型乳化剤であるポリオキシエチレンソルビタンモノステアレートを0.1部を採り、これに10%水酸化カリウム溶液を1.0部を加えて良く攪拌した。混合液は透明となった。これに精製水49.9部と油性成分としてジカプリン酸ネオペンチルグリコールを18.0部を加え、ホモミキサーで激しく攪拌し、ジカプリン酸ネオペンチルグリコールが水中に分散しているO/W型の乳化物を得た。この乳化物にW/O型乳化剤であるABILEM90(ゴールドシュミット社製、メチルポリシロキサン−セチルメチルポリシロキサン−ポリ(オキシエチレン・オキシプロピレン)メチルポリシロキサン共重合体)1.0部を加えさらにホモミキサーで激しく攪拌し、均一な乳化物を得た。
【0023】
この様にして得た乳化物を手の甲に採って伸ばした後、十分にすり込むように摩擦した。その使用感等を表1に示した。また、摩擦前後に水を一滴たらして撥水性を調べたところ摩擦前は水滴がなじんだが、摩擦後は水滴をはじいた。また、手の甲の上で電気伝導率を調べたところ、摩擦後は電導率が大幅に低下した。また、この乳化組成物の400倍の光学顕微鏡写真を図1〜3に示した。図1は製造後保存時、図2は手の甲に採って摩擦しているとき、図3は手の甲で十分に摩擦後である。この写真から一旦破壊された粒子が再乳化していることが分かる。
【0024】
比較例1
ABILEM90を加えなかった以外は実施例1と同様にして乳化組成物を得た。ただし精製水の量は50.9部とした。得られた乳化組成物は実施例1と同様にして評価した。
使用感等は表1に示した。水滴は摩擦後も良くなじんだ。導電率の低下はなかった。摩擦後に顕微鏡で観察したところ乳化粒子は見られなかった。
【0025】
【表1】

Figure 0003655720
【0026】
【発明の効果】
以上から明らかなように、本発明の乳化組成物は使用前は連続層が水性であるため、水に対する親和性が強く取り扱い性に優れる。一方、肌に適用後は層転移して連続層が油性となるため使用感に優れる。
このような使用により層転移する乳化組成物は本発明により初めて提供されるものである。本発明の乳化組成物は特に化粧料の用途としてその意義は大きいが、化粧料に限られないことはもちろんである。
【図面の簡単な説明】
【図1】本発明の乳化組成物の使用前の粒子の形状を表した写真である。
【図2】本発明の乳化組成物を肌に塗布して摩擦している途中の粒子の形状を表した写真である。
【図3】本発明の乳化組成物を肌に塗布して摩擦した後の粒子の形状を表した写真である。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an emulsified composition mainly used as a cosmetic. More specifically, the present invention relates to an emulsified composition that is O / W type at the time of production and storage, and phase transitions to W / O type when applied to the skin and rubbed.
[0002]
[Prior art]
Various oily components and aqueous components are often used in cosmetics, and they are often emulsified into cosmetics. As an emulsification type, there are an O / W type in which an oily component is emulsified and dispersed in an aqueous dispersion medium, and a W / O type in which an aqueous component is emulsified and dispersed in an oily component.
[0003]
O / W type emulsified cosmetics are excellent in handleability, but have drawbacks such as being easy to flow down due to sweat and water, and easily evaporating water. On the other hand, W / O type emulsified cosmetics have the advantages that they do not run off due to water or sweat and keep the moisture of the skin moderately evaporated. However, they are used because they feel heavy and sticky when applied to the skin. There are problems such as inferior feeling, difficulty in removing stains when attached to clothes, and difficulty in cleaning production containers and filling machines at the production site.
[0004]
[Problems to be solved by the invention]
An object of the present invention is to provide an emulsified composition that eliminates the disadvantages of the O / W type and the W / O type and has the advantages of both.
[0005]
[Means for Solving the Problems]
The present inventor has shown that the advantages of the O / W type are mainly exhibited until the stage of use in which the O / W type is applied to the skin and rubbed. After that, the disadvantages appear mainly. On the contrary, the advantages of the W / O type are mainly applied to the skin. Before that, I focused on the fact that there were many drawbacks. And it was thought that it would be a solution of said problem if it is an O / W type until it applies to skin, and it is an emulsion which is phase-transitioned to W / O type after application. As a result of intensive studies on the composition of the composition capable of causing such a phase transition, it was found that an emulsion composition containing a specific polymer causes the above phase transition. Completed the invention.
[0006]
That is, the first of the present invention contains an olefinically unsaturated carboxylic acid- (meth) acrylic acid alkyl ester copolymer, the oil component is emulsified in an aqueous component in O / W type, It is an emulsified composition that undergoes phase transition to W / O type when applied and rubbed. The second of the present invention contains an olefinically unsaturated carboxylic acid- (meth) acrylic acid alkyl ester copolymer, emulsified particles of oily components emulsified in O / W type, and W emulsified in O / W type. This is an emulsified composition comprising emulsified particles of / O type emulsifier.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail.
The emulsified composition of the present invention is a composition in which an emulsified particle of an oil component and an emulsified particle of a W / O emulsifier are mixed in an aqueous component as a medium in a state before being used. A small amount of W / O type emulsifier may be dissolved in the emulsified particles of the oil component. Further, a small amount of an oily component may be dissolved in the W / O type emulsifier particles, but most of the oily component needs to be a W / O type emulsifier, and it is preferable that substantially no oily component is present. The olefinically unsaturated carboxylic acid- (meth) acrylic acid alkyl ester copolymer is present dissolved in the aqueous component, and the oily component and the W / O emulsifier are stably emulsified or the emulsified particles are stabilized. It is thought that there is.
[0008]
When such an emulsified composition is applied to the skin and rubbed, the emulsification is once destroyed. And the W / O type emulsifier that has become dispersed particles comes to exhibit a function as an emulsifier, and further, by continuing friction, the oily component becomes a continuous phase and the aqueous component that has been a continuous phase until now becomes an independent emulsified particle. Thus, a phase transition occurs.
[0009]
The olefinically unsaturated carboxylic acid- (meth) acrylic acid alkyl ester copolymer in the present invention is disclosed in, for example, US Pat. No. 3,915,921, and as a specific product, BF Good. Examples include Rich's Pemlen TR-1 and Pemlen TR-2 (trademark).
[0010]
Examples of olefinically unsaturated carboxylic acids include acrylic acid, methacrylic acid, ethacrylic acid, α-chloroacrylic acid, α-cyanoacrylic acid, crotonic acid, α-phenylacrylic acid, β-acryloxypropionic acid, and sorbic acid. , Α-chlorosorbic acid, angelic acid, cinnamic acid, p-chlorocinnamic acid, β-styrylacrylic acid, itaconic acid, citraconic acid, mesaconic acid, glutaconic acid, aconitic acid, maleic acid, maleic anhydride, fumaric acid And ethylene tricarboxylic acid. Acrylic acid, methacrylic acid, maleic acid, and maleic anhydride are preferred. These can be used alone or in combination of two or more. The amount of the olefinically unsaturated carboxylic acid in the copolymer is preferably 95 to 50% by weight.
[0011]
The alkyl chain length of the (meth) acrylic acid alkyl ester is preferably 10 to 30 carbon atoms. Specific examples of the (meth) acrylic acid alkyl ester include decyl (meth) acrylate, lauryl (meth) acrylate, stearyl (meth) acrylate, behenyl (meth) acrylate, myristyl (meth) acrylate and the like. These can be used alone or in combination of two or more. The amount of the (meth) acrylic acid alkyl ester in the copolymer is preferably 5 to 50% by weight.
[0012]
If necessary, the unsaturated carboxylic acid- (meth) acrylic acid alkyl ester copolymer may be crosslinked using a crosslinking agent. Examples of the crosslinking agent include (meth) allyl (meth) acrylate, diallyl malonate, divinyl ether, glycol diacrylate, glyceryl triacrylate, divinylbenzene, polyalkenyl polyether of polyhydric alcohol, and the like. Alkenyl polyethers are preferred and polyallyl sucrose is particularly preferred. When a crosslinking agent is used, the amount is preferably 0.1 to 6% by weight in the copolymer.
[0013]
The copolymer can be produced by a known radical polymerization. The polymerization is preferably performed using a known radical catalyst. The polymerization method is not particularly limited, and bulk polymerization, suspension polymerization, solution polymerization, emulsion polymerization, precipitation polymerization and the like can be employed. It is preferable to polymerize in a solvent that does not substantially dissolve a copolymer obtained by dissolving at least one monomer.
The amount of the copolymer in the present invention is usually 0.1 to 5.0% by weight, preferably 0.2 to 1% by weight.
[0014]
The W / O type emulsifier of the present invention has an action of emulsifying an aqueous component in an oily component, and those conventionally used as a W / O type emulsifier can be used. , Liquids when heated, and solids that dissolve in oily solvents. It is important that the W / O type emulsifier does not adversely affect the skin when used in cosmetics. A silicon-based emulsifier is preferable, and a polymer having an organopolysiloxane skeleton such as methylpolysiloxane-cetylmethylpolysiloxane-poly (oxyethylene / oxypropylene) methylpolysiloxane copolymer is particularly preferable. The amount of the W / O type emulsifier is usually 0.1 to 10% by weight, preferably 0.5 to 3% by weight.
[0015]
There is no restriction | limiting in particular as an oil-based component which can be used for this invention. For example, if it is normally used for cosmetics, it can be preferably used. Specifically, vegetable oils such as jojoba oil, olive oil, macadamia nut oil, beeswax, candelilla wax, waxes such as tree wax, hydrocarbons such as liquid paraffin and squalane, higher alcohols such as cetanol and behenyl alcohol, palmitic acid , Fatty acids such as stearic acid, esters such as myristyl lactate, stearyl lactate, neopentyl alcohol dicaprate, triglyceride, methylpolysiloxane, highly polymerized methylpolysiloxane, cross-linked methylpolysiloxane, methylcyclopolysiloxane, silicone resin, silicone Silicon oil such as jelly, perfluoropolyether, oil-soluble placentan extract, oil-soluble plant extract, licorice flavonoid, glycyrrhetinic acid derivative, ceramide, oil-soluble vitamins, oil-soluble alcohol, oil Sexual parahydroxybenzoate derivative, ultraviolet absorbers oil-soluble can be exemplified.
The amount of the oil component is usually 10 to 60% by weight, preferably 15 to 40% by weight.
[0016]
In the present invention, an aqueous component that initially becomes a continuous layer and then becomes a dispersion layer is required. The aqueous component is usually water. In addition, various additives that are dissolved in water are treated as aqueous components in the present invention. For example, collagen, hydrolyzed collagen, hyaluronic acid, sodium hyaluronate, sodium chondroitin sulfate, water-soluble placentan extract, water-soluble plant extract, elastin, hydrolyzed elastin extract, beech extract, glycyrrhizinate, water-soluble vitamins, All water-soluble components used in cosmetics such as plant-like pseudocollagen, plant-like pseudo-placentan extract, water-soluble alcohol, water-soluble paraoxybenzoate, and water-soluble UV absorber can be used.
The amount of the aqueous component is usually 25 to 89.8% by weight, preferably 60 to 80% by weight.
[0017]
In the present invention, an O / W type emulsifier having an action of emulsifying an oily component in an aqueous component for the purpose of easily emulsifying the emulsified composition and enhancing its stability is also used as a (meth) acrylic acid- You may use together with a (meth) acrylic-acid alkylester copolymer. As the O / W type emulsifier, nonionic surfactants are preferable, and all conventionally used nonionic surfactants can be used. However, considering that there is no adverse effect when used as a cosmetic, polyoxy Preferred are ethylene hydrogenated castor oil, sorbitan fatty acid esters such as polyoxyethylene sorbitan monostearate, and the like. The amount of the O / W type emulsifier is preferably 0.05 to 5% by weight.
[0018]
The emulsifier of the present invention can be produced, for example, as follows.
First, an O / W type emulsifier is added to the olefinically unsaturated carboxylic acid- (meth) acrylic acid alkyl ester copolymer as necessary, an alkali is added thereto, and the mixture is stirred well, and water is further added. Water may be added simultaneously. The reason for adding the alkali is that the copolymer is usually not sufficiently dissolved on the acidic side, and it is made sufficiently water-soluble by making it neutral or acidic with an alkali. As the alkali, monovalent ants such as ammonium, sodium and potassium, polyvalent alkali hydroxides such as calcium and magnesium, carbonates and the like can be used, monovalent alkali is preferable, and caustic potash is particularly preferable. The amount of alkali is usually such that the copolymer is sufficiently dissolved to form an aqueous solution. The water is preferably sufficiently purified water. Next, a predetermined amount of an oil component is added and stirred well with a homomixer or the like to emulsify the oil component. Finally, a predetermined amount of a W / O type emulsifier is added and stirred well with a homomixer and emulsified.
The above production method is an example, and is not necessarily limited thereto, and is not particularly limited as long as it is a method in which both an oil component and a W / O emulsifier are emulsified in an O / W type.
[0019]
In the emulsion composition of the present invention thus produced, both the oil component and the W / O type emulsifier exist in the O / W type before use. Therefore, since the aqueous phase is a continuous phase, even if it adheres to clothes or the like, it is relatively easy to fall off and is not easily stained. At the manufacturing site, it is easy to clean the manufacturing apparatus, the filling apparatus, the storage apparatus, etc., and it is easy to change the brand. Moreover, when it is applied to the skin as a cosmetic, a light touch can be obtained, and so-called stretching is also good. And when it rubs into skin, emulsification will be destroyed by the frictional force at that time. As a result, the W / O type emulsifier that existed as emulsified particles exerts an emulsifying function, and conversely emulsifies the aqueous phase that has been a continuous phase until the oily component becomes a continuous phase, causing a phase transition to the skin. The W / O type emulsified form is considered. As a result, a light feeling of use is obtained, and it hardly flows due to water or sweat.
[0020]
The emulsified composition of the present invention can be used for all cosmetics applied to the skin of hands, nails, face, neck and other whole body. Specifically, it can be used for base makeup cosmetics such as emulsions, creams, essences, massages, tanning cosmetics, sunscreen cosmetics, nutritional creams, hand creams, lip balms and foundations.
[0021]
【Example】
EXAMPLES The present invention will be described below with reference to examples, but the present invention is not limited to these examples. In the following examples and comparative examples, parts and% are parts by weight and% by weight unless otherwise specified.
[0022]
Example 1
30 parts of 1% dispersion of Pemlen TR-1 (a copolymer of acrylic acid and alkyl acrylate, manufactured by BF Goodrich) in a 1 L stainless steel container, polyoxyethylene which is an O / W type emulsifier 0.1 part of sorbitan monostearate was taken, and 1.0 part of 10% potassium hydroxide solution was added thereto and stirred well. The mixture became clear. To this was added 49.9 parts of purified water and 18.0 parts of neopentyl glycol dicaprate as an oil component. The mixture was vigorously stirred with a homomixer, and the O / W type emulsification in which the dipentaglycol neopentyl glycol was dispersed in water. I got a thing. To this emulsion, 1.0 part of ABILEM 90 (manufactured by Goldschmidt, methylpolysiloxane-cetylmethylpolysiloxane-poly (oxyethylene / oxypropylene) methylpolysiloxane copolymer), which is a W / O type emulsifier, was added, and the mixture was further homogenized. The mixture was vigorously stirred with a mixer to obtain a uniform emulsion.
[0023]
The emulsion thus obtained was taken and stretched on the back of the hand, and then rubbed so as to be sufficiently rubbed. The feeling of use and the like are shown in Table 1. In addition, when a drop of water was added before and after friction and the water repellency was examined, water droplets were familiar before friction, but water droplets were repelled after friction. In addition, when the electrical conductivity was examined on the back of the hand, the electrical conductivity decreased significantly after friction. Moreover, the optical microscope photograph of 400 times of this emulsion composition was shown to FIGS. FIG. 1 is stored after manufacture, FIG. 2 is taken and rubbed on the back of the hand, and FIG. 3 is fully rubbed on the back of the hand. It can be seen from the photograph that the particles once broken are re-emulsified.
[0024]
Comparative Example 1
An emulsified composition was obtained in the same manner as in Example 1 except that ABILEM90 was not added. However, the amount of purified water was 50.9 parts. The obtained emulsion composition was evaluated in the same manner as in Example 1.
The feeling of use and the like are shown in Table 1. The water droplets became familiar even after friction. There was no decrease in conductivity. When observing with a microscope after friction, no emulsified particles were observed.
[0025]
[Table 1]
Figure 0003655720
[0026]
【The invention's effect】
As is apparent from the above, since the continuous layer is aqueous before use, the emulsion composition of the present invention has a strong affinity for water and excellent handleability. On the other hand, after application to the skin, the layer transitions and the continuous layer becomes oily, so the feeling of use is excellent.
The emulsified composition that undergoes layer transition by such use is provided for the first time by the present invention. The emulsified composition of the present invention is particularly significant for cosmetics, but it is of course not limited to cosmetics.
[Brief description of the drawings]
FIG. 1 is a photograph showing the shape of particles before use of the emulsion composition of the present invention.
FIG. 2 is a photograph showing the shape of particles that are being rubbed by applying the emulsion composition of the present invention to the skin.
FIG. 3 is a photograph showing the shape of particles after the emulsion composition of the present invention is applied to the skin and rubbed.

Claims (5)

オレフィン性不飽和カルボン酸−(メタ)アクリル酸アルキルエステル共重合体を含有し、O/W型に乳化された油性成分の乳化粒子とO/W型に乳化されたW/O型乳化剤の乳化粒子が混在してなる乳化組成物。  Emulsification of oily component emulsified in O / W type and W / O type emulsifier emulsified in O / W type, containing olefinically unsaturated carboxylic acid- (meth) acrylic acid alkyl ester copolymer An emulsified composition in which particles are mixed. さらにO/W型の乳化剤を含有する請求項の乳化組成物。The emulsified composition according to claim 1 , further comprising an O / W type emulsifier. オレフィン性不飽和カルボン酸が(メタ)アクリル酸である請求項1又は2の乳化組成物。The emulsified composition according to claim 1 or 2 , wherein the olefinically unsaturated carboxylic acid is (meth) acrylic acid. (メタ)アクリル酸アルキルエステルのアルキル基の炭素数が10〜30である請求項1〜のいずれか1項の乳化組成物。(Meth) any one of the emulsified composition of claim 1 to 3 carbon atoms in the alkyl group of the alkyl acrylate is 10 to 30. W/O型乳化剤がメチルポリシロキサン−セチルメチルポリシロキサン−ポリ(オキシエチレン・オキシプロピレン)メチルポリシロキサン共重合体である請求項1又は2の乳化組成物。The emulsified composition according to claim 1 or 2 , wherein the W / O emulsifier is a methylpolysiloxane-cetylmethylpolysiloxane-poly (oxyethylene / oxypropylene) methylpolysiloxane copolymer.
JP33897196A 1996-12-04 1996-12-04 Emulsified composition Expired - Fee Related JP3655720B2 (en)

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