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Cosmetic raw material using core-corona type microparticles and oil-in-water emulsified cosmetic

a technology of oil-in-water emulsified cosmetics and cosmetic raw materials, which is applied in the field of cosmetic raw materials, can solve the problems of difficult to achieve the effect of emulsification stability, and less stickiness

Inactive Publication Date: 2019-09-26
SHISEIDO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patent describes a new type of emulsifier made up of small particles. When used in a cosmetic product, this emulsifier helps create a stable oil-in-water emulsified product that is less sticky, powdery, or greasy. It also makes the product easier to wash off with water.

Problems solved by technology

Further, since blending a large amount of surfactants causes stickiness, there is a demand for an emulsification method without relying on surfactants.
Inorganic powders such as metal oxides, minerals (for example, silica) or the like are widely used as the afore-mentioned powder; however, emulsification capability of these powders is weak and the powder needs to be blended in a large amount.
Thus, powdery or squeaky feeling in the resulting cosmetic was problematic.
Further, since oil droplets emulsified by inorganic powders are weak against impact and are easily united by stirring or vibration, low emulsification stability of the cosmetic was problematic.
However, when the crosslink density of the core part of the afore-mentioned microgel is low, the core-structure collapses during swelling, and when the crosslink density is too high, the microgel aggregates.
In either case, there was a problem that the afore-mentioned microgel did not function as an emulsifier.

Method used

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  • Cosmetic raw material using core-corona type microparticles and oil-in-water emulsified cosmetic

Examples

Experimental program
Comparison scheme
Effect test

example 1

n Example of a Core-Corona Type Microparticle Dispersion

[0120]Macro monomer and hydrophobic monomer described in Table 1 were radically polymerized under polymerization conditions shown in Tables 1 and 2 in accordance with the following production method (Technique 1). The appearance of the obtained copolymer dispersion was evaluated visually, and the sizes of particles and the degree of dispersion of the copolymers were evaluated in accordance with Technique 2. Results are shown in Table 3.

[0121]

[0122]Polyethyleneoxide macro monomer and hydrophobic monomer were added into 90 g of water-alcohol mixed solvent in a three-neck flask equipped with a reflux tube and a nitrogen feeding tube. After sufficient dissolution or dispersion, dissolved oxygen was removed by nitrogen substitution for 20 minutes. Then, 1 mol % of the polymerization initiator, 2,2′-azobis(2-methylpropionamidine) dihydrochloride, with respect to the total amount of monomers, was dissolved in a small amount of water a...

example 2

ension Reducing Effect

[0132]Effects on oil / aqueous interfacial tension were analyzed with respect to core-corona type microparticles according to the present invention.

[0133]A droplet of the core-corona type microparticle dispersion of Production Example 5 was produced in dodecane with a syringe. The dodecane / aqueous interfacial tension at an optional dispersion concentration was measured by a pendant drop method (Automatic contact angle meter DM-501, manufactured by Kyowa Interface Science Co., Ltd.) that can measure interfacial tension values by analyzing the shape of the droplet. The conventional crosslinked core-corona type microparticles ((Acrylates / Methoxy PEG-90 Methacrylate) Crosspolymer) were used as a control. The results are shown in FIG. 1.

[0134]In the case of (Acrylates / Methoxy PEG-90 Methacrylate) Crosspolymer, the dodecane / aqueous interfacial tension rapidly decreased when the addition concentration exceeded 0.0001% by weight; but thereafter, the interfacial tension d...

example 3

ter Emulsified Cosmetic

[0137]Next, an example of a cosmetic emulsified by the core-corona type microparticles of the aforementioned production example will be shown. Cosmetics of the formulations described in Table 4 were produced in accordance with Technique 3 and evaluated in accordance with Technique 4. The results are also shown in Table 4.

[0138]

[0139]Various aqueous phase components such as polyols and thickeners were added to purified water and mixed. The cosmetic raw material according to the present invention was separately dispersed to purified water, added to the mixture, and stirred and mixed. The cosmetic raw material and the aqueous phase components were homogeneously dispersed, to which the oil phase components were added, followed by shear mixing with a homomixer until homogeneous to obtain the oil-in-water emulsified cosmetic.

[0140]

Evaluation (1): Transparency (White Turbidity)

[0141]Samples were measured with a Spectrophotometer V-630 (manufactured by JASCO Corporati...

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Abstract

An emulsifier is comprised of core-corona type microparticles that an emulsification capability thereof is not affected by the crosslinking level and an oil-in-water emulsified cosmetic emulsified by the afore-mentioned emulsifier. A cosmetic raw material comprising: a core-corona type microparticles that is obtained by radical polymerization of a polyethylene oxide macromonomer represented by a chemical formula (1), and at least one hydrophobic monomer selected from a group of an acrylate derivative monomer represented by a chemical formula (2) and an acrylamide derivative monomer represented by a chemical formula (3) under the conditions (A) to (D);wherein R1 is at least one substitute selected from a group consisting of H and an alkyl group having 1 to 3 carbon atoms, n is a number of 8 to 200, and X is at least one substitute selected from a group consisting of H and CH3;wherein R2 is at least one substitute selected from a group consisting of H and an alkyl group having 1 to 3 carbon atoms, and R3 is a substituent that has an alkyl group having 1 to 12 carbon atoms;wherein R4 is at least one substitute selected from a group consisting of H and an alkyl group having 1 to 3 carbon atoms, and both R5 and R6 are one substitute selected from a group consisting of H and substituents that have an alkyl group having 1 to 18 carbon atoms.

Description

RELATED APPLICATION[0001]This application claims the priority to Japanese Patent Application No. 2016-188437, filed on Sep. 27, 2016, the disclosure of which is incorporated herein by reference in its entirety.FIELD OF THE INVENTION[0002]The present invention relates to a cosmetic raw material, and more specifically to a cosmetic raw material comprised of core-corona type microparticles and an oil-in-water emulsified cosmetic using the same.BACKGROUND OF THE INVENTION[0003]Recently, with the increase in the number of consumers who concern for safety, cosmetics that do not substantially comprise surfactants tend to be preferred. Further, since blending a large amount of surfactants causes stickiness, there is a demand for an emulsification method without relying on surfactants.[0004]As a method of preparing an oil-in-water emulsion without surfactants, a Pickering emulsion method that emulsifies by adhering a powder to an interface between an oil phase and an aqueous phase is known (...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A61K8/91A61K8/06A61Q19/00C08F290/06
CPCA61K8/91C08F290/062A61Q19/00A61K8/068A61Q1/00A61Q17/04A61K8/062A61K8/8152A61K8/8158A61K8/0245C08F220/14C08F220/1804C08F220/54C08F220/60C08F220/306A61K8/84C08F290/06A61K2800/413C08F220/18C08F220/56A61K8/06A61K8/81A61Q5/00A61Q17/00A61K8/00A61K8/86
Inventor SUGIYAMA, YUKIFUKUHARA, RYUSHIHAN, YANG
Owner SHISEIDO CO LTD