Daicel Chemical Industries, Ltd.

Daicel Corporation

Hitoshi Watanabe

Hidetaka Hayamizu

Masaaki Kishimura

Hiroyuki Miura

Hidehiko Nakajima

Tomohide Ina

Naruhisa Hirai

Noboru Kamei

Akihiro Kuwana

Ryouta Kojima

Yasushi Yamamoto

Naoyuki Fukui

Kenji Kobayashi

Mami Shimamura

Provided is a titanium oxide dispersion liquid that has dispersibility and dispersion stability both at superior levels and, when applied and dried, can form a photocatalyst coating film capable of rapidly developing excellent photocatalytic activity. The titanium oxide dispersion liquid according to the present invention includes titanium oxide particles (A), a dispersing agent (B), and a solvent (C). The titanium oxide particles (A) support a transition metal compound. The dispersing agent (B) includes a poly(acrylic acid) or a salt thereof. The poly(acrylic acid) or a salt thereof in the dispersing agent (B) preferably includes a poly(acrylic acid) alkali metal salt. The poly(acrylic acid) or a salt thereof in the dispersing agent (B) preferably has a weight-average molecular weight of from 1000 to 100000.

Titanium oxide dispersion liquid, titanium oxide coating liquid, and photocatalyst coating film

Process for producing photoresist polymeric compound having repeated units corresponding to at least one monomer selected from monomer (a) having lactone skeleton, monomer (b) having group which becomes soluble in alkali by elimination with acid, and monomer (c) having alicyclic skeleton having hydroxyl group. Process includes (A) polymerizing mixture of monomers containing at least one monomer selected from the above monomers (a), (b), and (c), and (B) extracting polymer formed in the polymerization by using organic solvent and water to partition the formed polymer into organic solvent layer and metal component impurity into aqueous layer, or passing polymer solution, which contains polymer having repeated units corresponding to at least one of the above monomers (a), (b), and (c) and metal content of which is 1000 ppb by weight or less relative to the polymer through filter comprising porous polyolefin membrane having cation-exchange group. The photoresist polymeric compounds have a metallic impurity content that is extremely low.

Process for producing photoresist polymeric compounds

A method produces a 3,4-dihydro-1,2,3-oxathiazin-4-one-2,2-dioxide compound of following formula (2): wherein Rand Rare the same as or different from each other and are each hydrogen atom or an organic group inert to the reaction; and Ris hydrogen atom or an organic group inert to the reaction, or a salt thereof, by subjecting a beta-ketoamide-N-sulfonic acid of following Formula (1): wherein R, Rand Rare as defined above; and X is hydrogen atom, or a salt thereof, to cyclization in the presence of an acid anhydride with or without further subjecting the cyclized product to hydrolysis, in which the cyclization is continuously carried out using a continuous flow reactor.

Method for producing 3, 4-dihydro-1,2,3-oxathiazin-4-one-2,2-dioxide compound or salt thereof

A reaction mixture obtained by reacting a substrate in the presence of an imide compound having an imide unit represented by the formula () can be efficiently separated through crystallization and/or extraction with a specific solvent into the imide compound and a reaction product. (In the formula, X represents oxygen, hydroxyl, or acyloxy.) Furthermore, a mixture comprising the imide compound and a metal catalyst can be efficiently separated through crystallization, adsorption, and/or extraction into the imide compound and the metal catalyst.

Process for separating imide compounds

Process for the production of high-molecular compounds for photoresist

In the presence of (1) an oxidizing catalyst comprising an imide compound such as N-hydroxyphthalimide, or (2) an oxidizing catalyst comprising such imide compound and a transition metal element-containing compound as a co-oxidizing agent (e. g., oxides, halides, complexes, hetero polyacid salts) a hydrocaron, an alcohol, an aldehyde, or a ketone as a substrate is brought into contact with molecular oxygen for oxidation. In the above-described oxidation process, the water content of the oxidizing reaction system is 200 mol or lower relative to 1 mol of the imide compound. According to the present invention, a substrate is efficiently oxidized with molecular oxygen under mild conditions, and there can be obtained the object compound(s) of high quality.

Oxidation method

Process for preparing cycloalkanone

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Himeji, Japan

Hitoshi Watanabe