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Surface-coated powder and cosmetic preparation containing the same

A surface coating and powder technology, applied to medical preparations containing active ingredients, body powder, cosmetic preparations, etc., can solve the problems of poor makeup durability and floating cosmetic film, and achieve excellent water resistance , Excellent adhesion, excellent skin adhesion and makeup durability

Inactive Publication Date: 2008-03-26
KOBAYASHI KOSE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if moisturizing oil ingredients with high skin affinity are mixed in cosmetics, the makeup film will often float from the skin due to the sweat secreted by the skin after a certain period of time, and the durability of the makeup will deteriorate.

Method used

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  • Surface-coated powder and cosmetic preparation containing the same
  • Surface-coated powder and cosmetic preparation containing the same
  • Surface-coated powder and cosmetic preparation containing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0056] The following examples are given to illustrate the present invention in more detail, but the present invention is not limited thereto.

Synthetic example 1

[0058] Manufacture of siloxy-containing methacrylic acid copolymers:

[0059]Add 60 parts of tris(trimethylsiloxy) silylpropyl methacrylate, 15 parts of methacrylic acid and 25 parts of methyl methacrylate as monomer components into a 500 mL flask, and acetic acid as a solvent 110 parts of butyl ester, 70 parts of ethyl acetate, 30 parts of isopropanol, and 0.5 part of 2,2'-azobisisobutyronitrile as a reaction initiator. In order to remove dissolved oxygen, this beaker was bubbled in nitrogen and sealed. The reaction container was moved to a thermostat, and polymerized for 15 minutes while stirring at 60°C. After the polymerization, the solvent was replaced with dimethyl polysiloxane (SH200C-6cs: produced by Toray Dow Corning Co.), to obtain a dimethyl polysiloxane resin solution (solid Ingredient concentration 20%). This siloxy group-containing methacrylic acid copolymer has a structure represented by the following chemical formula (5). The GPC polystyrene-equivalent numb...

Embodiment 1

[0064] Surface coated sericite (1):

[0065] Add 500 parts by mass of isopropanol (hereinafter simply referred to as "parts") and 950 parts of sericite (Sansin Serisite FSE: manufactured by Sanshin Mining Co., Ltd.) to a Henschel mixer (manufactured by Mitsui Mining Co., Ltd.) 250 parts of a dimethyl polysiloxane resin solution (solid content concentration: 20%) of a siloxy group-containing methacrylic acid copolymer was uniformly dispersed. Next, it heated to 100 degreeC, stirring, distilled off isopropanol under reduced pressure, cooled to room temperature, and pulverized with a pulverizer to obtain surface-coated sericite. The coating amount of the methacrylic copolymer containing siloxy group is 5% of that of the sericite coated on the surface.

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Abstract

A surface-coated powder obtained by treating the surface of a powder with a siloxy-containing (meth)acrylic acid copolymer obtained by polymerizing (a) 55-65 mass% monomer represented by the following general formula (1): [Chemical formula 1] (1) (wherein R1 is H or CH3 and p is an integer of 2-6), (b) 20-30 mass% monomer represented by the following general formula (2): [Chemical formula 2] (2) (wherein R2 is H or CH3 and R3 is C1-5 alkyl or phenyl), and (c) 15-20 mass% acrylic acid and / or methacrylic acid. This surface-coated powder is excellent in water resistance and adhesion to the skin. A cosmetic preparation containing this surface-coated powder neither gives a discomfortable feeling to the skin nor imposes a burden on the skin after application. The cosmetic preparation is excellent in skin adhesion and makeup retention.

Description

technical field [0001] The present invention relates to a powder coated with a specific siloxy group-containing (meth)acrylic copolymer and cosmetics containing it. More specifically, the present invention relates to excellent water resistance and skin adhesion. Surface-coated powder with excellent durability and beauty products with excellent long-lasting makeup and adhesion by containing this powder. Background technique [0002] Beauty products, especially cosmetics, are substances that express a covering effect by attaching powders such as pigments to the skin. However, in recent years, cosmetics have been required to have water resistance and long-term makeup durability, as represented by waterproof function marks, and various surface treatment agents such as silicone resins and fluorochemical resins have been developed to impart powder adhesion properties. Water-resistant technology (for example, refer to Patent Documents 1 to 3). However, in the conventional techniq...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61K8/81A61K8/19C09C3/10
CPCA61K2800/412A61K8/11C09C3/12A61Q1/12A61K8/8152A61K8/81A61K8/89A61K8/90
Inventor 松下笃中林治郎
Owner KOBAYASHI KOSE CO LTD