Nippon Peroxide Co., Ltd.

Showa Chemical Co., Ltd.

Ryuichi Kayama

Toshio Suzuki

Yoshikazu Yamamoto

Hiroshi Igarashi

Fumiaki Nishino

Minoru Saotome

Sachiko Kusano

Nobuo Watani

A method for preparing a poly-&agr;-hydroxyacrylate aqueous solution, which comprises reacting a polylactone compound corresponding to poly-&agr;-hydroxyacrylic acid (hereinafter referred to as &ldquo;PLAC&rdquo;) with an alkali, wherein the alkali is added dividedly.

Method for preparing poly-&agr;-hydroxyacrylate aqueous solution

A stabilizing agent for peroxide-bleaching procedure includes (A) a component including a homopolymer or copolymer of .alpha.-hydroxyacrylic acid or water soluble salt or polylactone of the homo- or co-polymer, (B) a component including a homopolymer or copolymer of acrylic acid, methacrylic acid and/or maleic acid and water-soluble salt of the homo- or co-polymer, (C) a component including DTPA, TTHA or water-soluble salt thereof and optionally (D) a component including a water-soluble inorganic Mg salt and is used to pretreat a fiber material with a pretreating liquid containing the stabilizing agent before bleaching with peroxide, or to bleach the fiber material by a bleaching liquid containing a peroxide bleaching agent and the stabilizing agent.

Stabilizing agent for peroxide-bleaching procedure and methods of

An .alpha.-olefin oxide is produced with an enhanced reaction selectivity by a method in which an .alpha.-olefin having 6 to 30 carbon atoms is epoxidized in an aqueous solution containing hydrogen peroxide, acetic acid, an acid catalyst, for example, sulfuric acid, and a side reaction-inhibiting agent consisting of a water-soluble neutral salt, for example, sodium sulfate, in an amount of 2 to 30% based on the total weight of the aqueous solution, by an in-situ method, while maintaining the pH of the aqueous solution at a level of 0 to 1, and the resultant reaction product is collected.

Method of producing olefin oxide

An optically active enantiomer of tartaric acid or a salt thereof is racemized by mixing meso-tartaric acid or a salt thereof with a solution of an optically active enantiomer of tartaric acid or a salt thereof in a molar ratio of 0.2 - 0.5 and thereafter heating the mixture.

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Koriyama, Japan

Ryuichi Kayama