Sekisui Kasei Co., Ltd.

Kengo Nishiumi

Shinya Matsuno

Biodegradable resin particles including a polyhydroxy alkanoate. In the biodegradable resin particles, an amount of a Ca component present in the particles is 10 to 10,000 ppm, the biodegradable resin particles have a volume average particle diameter of 2 to 50 μm, the biodegradable resin particles have a BET specific surface area of 0.8 to 10 m/g, and the biodegradable resin particles have a linseed oil absorption of 50 to 300 ml/100 g. The resin particles of the present invention can be suitably used by being included in an external preparation, such as a cosmetic or a quasi-drug.

Biodegradable resin particles and external preparation including the same

Organic-inorganic composite particles include: a vinyl polymer that is a polymer of a polymerizable vinyl monomer; and inorganic particles including inorganic oxide and/or inorganic nitride. The thermal conductivity of the inorganic particles is 10 W/(m&#xb7;K) or more. The inorganic particles are subjected to a surface treatment by acidic phosphoric acid ester having no polymerizable functional group, and by at least one polymerizable compound selected from the group consisting of: carboxylic acid having a polymerizable functional group; acidic phosphoric acid ester having a polymerizable functional group; and lactone having a polymerizable functional group. The polymerizable compound is bonded to the vinyl polymer, and the inorganic particles are unevenly located on surface layers of the organic-inorganic composite particles so that the inorganic particles form one or more layers.

Organic-inorganic composite particles and manufacturing method therefor, and thermally conductive filler and thermally conductive resin composition and manufacturing method therefor

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Shiga, Japan

Kengo Nishiumi