Shiseido Company, Limited

Nof Corporation

Yuki Sugiyama

Takashi Ohmori

Ryushi Fukuhara

Susumu Yoshida

Koji Abe

Ken Shoji

Tomoko Sato

Kazuyuki Miyazawa

Kei-ichi Maruyama

Masaki Kitajima

Tomoyuki Kawasoe

Akira Ishikubo

Yuko Matsui

Tomiko Takakura

Heinz Hoffmann

Yoji Tezuka

Takashi Teshigawara

Hideto Ueda

Hiroyasu Mizuno

Hirohito Shirakami

Nobuyoshi Koga

Yang Han

Martin Reger

Kei-Ichi Maruyama

A method of emulsification of an oil phase in an aqueous continuous phase, by dispersing core-corona microparticles into the aqueous phase, adding the oil phase, and applying shearing force for a time sufficient to emulsify the resulting mixture. The core-corona microparticles are obtained by radical co-polymerization of a polyethylene oxide macromonomer with at least one hydrophobic acrylate monomer and at least one hydrophobic acrylamide monomer.

Method of emulsification using core-corona type microparticles

Provided are: a core-corona polymer particle excellent in emulsion stability and feeling of use, and a raw material for a cosmetic and an oil-in-water emulsion cosmetic comprising the particle. Certain embodiments of the present invention provides a core-corona polymer particle obtained by radical-polymerizing a polyethylene oxide macromonomer represented by formula (1) and one or two or more of hydrophobic monomers represented by formulas (2) and (3) under conditions (A) to (D).

Raw material for cosmetic and oil-in-water emulsion cosmetic comprising core-corona polymer particle

Provided are a raw material for a cosmetic and an oil-in-water emulsion cosmetic comprising a core-corona polymer particle excellent in emulsion stability and feeling of use. Certain embodiments of the present invention provides a raw material for a cosmetic, comprising a core-corona polymer particle dispersion obtained by radical-polymerizing a polyethylene oxide macromonomer represented by formula (1) and one or two or more of hydrophobic monomers represented by formulas (2) and (3) under conditions (A) to (D).

Core-corona polymer particles

A starting (raw) material, for cosmetics, comprising a core corona type microgel dispersion obtained by radical polymerization of a specific polyethylene oxide macromonomer, a specific hydrophobic monomer, and a specific cross-linking monomer under specific conditions. The purpose of the present invention is to provide the raw material for cosmetics, with which the cosmetic having a high stability provides a good feeling in use and does not cause skin irritation, can be easily produced.

Starting material for cosmetics

The present invention provides a corona-core microgel emulsifying agent composed of a copolymer obtained by polymerizing polyethylene oxide macromonomers, hydrophobic monomers, and cross-linking monomers under specific conditions as well as an oil-in-water emulsified composition characteristically using said emulsifying agent for emulsification. The object of the present invention is to provide a new corona-core microgel emulsifying agent to be used to prepare an oil-in-water emulsified composition that manifests superior emulsification stability, stability over time, and low skin irritation, and is free of stickiness at the time of application, manifests dewy freshness, is free of powdery sensation and/or squeakiness, and is superior in durability of fragrance, as well as an oil-in-water emulsified composition emulsified with said emulsifying agent.

Corona-core microgel emulsifying agent and oil-in-water emulsified composition

Method of making oil-in-water emulsified composition using corona-core microgel emulsifying agent

The present invention provides a sunscreen composition containing (a) a surfactant, (b) water, (c) an oil component, and (d) a water- and/or oil-soluble ultraviolet absorbent, that is in a bicontinuous microemulsion phase at 25&#xb0; C. The transparent bicontinuous microemulsion spreads well when applied to the skin, to give a uniform and well-absorbed film.

Sunscreen composition

It is an object of the invention to provide a polymersome excellent in the safety and feeling in use; in particular, there is no sticky feeling but there is a good refreshing feeling; and with excellent base-agent stability. A polymersome of the present invention comprises a block-type alkylene oxide derivative represented by the following formula (I) as the membrane component:RO-[(EO)(AO)(EO)]&#x2014;R&#x2003;&#x2003;(I)wherein AO is an oxyalkylene group having 3 to 4 carbon atoms, EO is an oxyethylene group, m and 1+n are the average addition mole numbers for the oxyalkylene group and the oxyethylene group, respectively, and 1&#x2266;m&#x2266;70, 1&#x2266;l+n&#x2266;70; the percentage of the oxyethylene groups with respect to the sum of the oxyalkylene groups having 3 to 4 carbon atoms and the oxyethylene groups is 20 to 80 mass %; the addition pattern of the oxyalkylene groups having 3 to 4 carbon atoms and the oxyethylene groups is block-type; and Rand Rare identical or different hydrocarbon groups having 1 to 4 carbon atoms.

Polymersomes and production method thereof

The present invention provides a sunscreen cosmetic comprising, relative to the total amount of the sunscreen cosmetic, 10-90 wt % of agar microgel (wherein the agar content in the agar microgel is 0.4-1 wt %) and 0.1-5 wt % of a water soluble ultraviolet absorbent. It was necessary to blend in an organic ultraviolet absorbent and such to give sunscreen cosmetics a high SPF value. However, there was a problem in that it was hard for a water soluble ultraviolet absorbent in the formulation to achieve the expected SPF function. Also, sunscreen cosmetics are particularly desired to give a freshing texture upon use. In view of the fact that a high blend ratio of an oil soluble ultraviolet absorbent inhibits the freshing texture upon use, the object of the present invention is to provide a sunscreen cosmetic that achieves a high SPF value and a freshing texture upon use by mainly blending in a water soluble ultraviolet absorbent.

Sunscreen cosmetic

The present invention is to provide a new compound having a rough skin improving effect, excellent in safety, excellent in texture in use, especially free of sticky feeling, excellent in refreshing feeling, and capable to improve the base agent stability as a component. An alkylene oxide derivative is characterized by being represented by the below-described general formula (I):(formula I)Z&#x2014;{O-[(AO)-(EO)]-R}&#x2003;&#x2003;(I)(In the formula, Z is the residue obtained by removing hydroxyl groups from the dimer diol, EO is an oxyethylene group, AO is an oxyalkylene group having 3 to 4 carbon atoms, and the addition form is block-type. The symbols a and b are the average addition mole numbers of the above-described oxyalkylene group and the oxyethylene group, respectively, and they are 1&#x2266;2 a&#x2266;150 and 1&#x2266;2 b&#x2266;150. The percentage of the oxyethylene groups with respect to the sum of the oxyalkylene groups having 3 to 4 carbon atoms and the oxyethylene groups is 10 to 99 mass %. Rs may be either identical to or different from each other, and they are hydrocarbon groups having 1 to 4 carbon atoms.)

Alkylene oxide derivative and skin external preparation containing the same

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Yokohama, Japan

Yuki Sugiyama