Kao Corporation

Kimikazu Fukuda

Koji Mine

Masanori Orita

Yukio Inomata

Keigo Kajiwara

Yoko Nakajima

Michiya Takagi

Shinobu Hiramatsu

Kazuo Matsuyama

Katsutake Uehiro

Yuka Onishi

Disclosed herein is a method for producing hydrogel particles including the steps of: solidifying an aqueous solution in which a gel agent forming a non-crosslinked hydrogel is dissolved and which has a gel point of 30&#xb0; C. or more by putting the aqueous solution into a liquid phase having a temperature of equal to or lower than the gel point; and crushing a solidified product obtained by solidifying the aqueous solution in which the gel agent is dissolved.

Method for producing hydrogel particles

Hydrogel particles include: a continuous phase of non-crosslinked hydrogel; and a dispersed phase dispersed in the continuous phase. The dispersed phase includes a crystalline organic UV absorber and a solid fat having an organic value (OV) of 310 or more and an inorganic value (IV) of 130 or more on an organic conceptual diagram. The content of the crystalline organic UV absorber in the dispersed phase is 15-70 mass %.

Hydrogel particles

Hydrogel particles include a continuous phase portion of non-crosslinked hydrogel and disperse phase portions dispersed in the continuous phase portion. Each of the disperse phase portions contains a solid oil and a liquid oil as an oil component, and titanium oxide particles dispersed therein. The solid oil of the oil component contains a higher alcohol and a solid paraffin, and the content of the solid oil in the disperse phase portion is 1 to 12 mass %. The hydrogel particles have a volume-average particle diameter of 10 to 300 &#x3bc;m.

The present invention provides a process for producing 2-(1-hydroxyalkyl)cycloalkanone and/or 2-(1-hydroxyaryl)cycloalkanone in high yield and selectivity, as well as a process using the same to produce a cycloalkanone derivative useful as a perfume material and a physiologically active substance. Disclosed is a process for producing compound (3), which includes subjecting a cycloalkanone, and aldehyde (2) containing carboxylic acid (1), to aldol condensation in the presence of water and a basic catalyst, wherein the molar amount (referred to hereinafter as A) of the basic catalyst added is not less than the molar amount (referred to hereinafter as B) of the carboxylic acid (1) contained in the aldehyde (2) and the difference between A and B, that is, (A&#x2212;B) is 0.06 mol or less per mol of the aldehyde (2), as well as a process for producing compounds (7) and (8) by using the compound (3) obtained by the above process. wherein n is an integer of 1 or 2, Rrepresents H or a C1 to C8 alkyl group or the like, and Rrepresents a C1 to C3 alkyl group.

Growing community of inventors

Wakayama, Japan

Kimikazu Fukuda