Otsuka Chemical Co., Ltd.

Japan Science and Technology Agency

Otsuka Kagaku Kabushiki Kaisha

Takashi Kameshima

Yuji Tada

Shinji Nakano

Yoichi Nishioka

Tadao Yabuhara

Hiroyuki Takase

Shigeru Yamago

Kazuhiro Kawano

Junichi Yoshida

Emiko Daimon

Osamu Ito

Kunihiko Sugoh

Ken Shu

Biswajit Ray

An organoantimony compound represented by the formula (1), processes for producing polymers with use of the compound, and polymers wherein Rand Rare C-Calkyl, aryl, substituted aryl or an aromatic heterocyclic group, Rand Rare each a hydrogen atom or C-Calkyl, and Ris aryl, substituted aryl, an aromatic heterocyclic group, oxycarbonyl or cyano.

Organic antimony compound, process for producing the same, living radical polymerization initiator, process for producing polymer using the same, and polymer

An organobismuth compound represented by the formula (1) wherein Rand Rare C-Calkyl, aryl, substituted aryl or an aromatic heterocyclic group, Rand Rare each a hydrogen atom or C-Calkyl, and Ris aryl, substituted aryl, an aromatic heterocyclic group, acyl, amido, oxycarbonyl or cyano.

Organic bismuth compound, method for producing same, living radical polymerization initiator, method for producing polymer using same, and polymer

The present invention provides a simple and efficient method for producing high-purity 2,3,6,7,10,11-hexahydroxytriphenylene on an industrial scale. The method for producing 2,3,6,7,10,11-hexahydroxytriphenylene comprises reacting catechol with peroxide.

Method for producing 2,3,6,7,10,11-hexahydroxytriphenylene

An improved phenoxyphosphazene compound is produced by treating a phenoxyphosphazene compound with (a) at least one adsorbent selected from activated carbon, silica gel, activated alumina, activated clay, synthetic zeolite and macromolecular adsorbents, (b) at least one reagent selected from metal hydrides, hydrazine, hypochlorites, thiosulfates, dialkyl sulfuric acids, ortho esters, diazoalkanes, lactones, alkanesultones, epoxy compounds and hydrogen peroxide, or (c) both the adsorbent and reagent, thereby reducing the acid value of said phosphazene compound to lower than 0.025 mgKOH/g.

Process for producing phenoxyphosphazene compound, flame-retardant resin composition, and flame-retardant resin molding

A flame-retardant resin composition comprising a phosphazene flame retardant and a polyester resin, wherein the flame retardant is bonded to the molecules of the polyester resin via the ester group thereof, can retain a high flame retardance for a prolonged term with little or no vaporization with time and is excellent in flame retardance, impact resistance, properties and processability.

Flame-retardant resin, composition thereof, and process for producing the same

A powdery flame retardant which is obtained by mixing a flame retardant which is liquid or a viscous solid at ordinary temperature with an inorganic fibrous substance to adhere or adsorb the retardant to the fibrous substance, and which comprises 5 to 70 wt. % the flame retardant and 95 to 30 wt. % the fibrous substance. The powdery flame retardant can be easily handled because it is a powder, and is obtained by a simple and industrially advantageous method. It produces a remarkable effect that the performance of the liquid or viscous flame retardant is not impaired.

Powdery flame retardant

An object of this invention is to impart excellent flame retardancy to an aromatic polyamide resin without use of a halogen compound which is responsible for generation of gases harmful to the human body and without decreasing preferred properties (e.g. mechanical properties, and molding processability) inherently possessed by aromatic polyamide resins, the flame-retardant aromatic polyamide resin composition of this invention comprising (a) 100 parts by weight of an aromatic polyamide resin, (b) 0.1 to 100 parts by weight of a crosslinked phosphazene compound which is a compound crosslinked with a crosslinking group, such as phenylene groups, the crosslinking group being interposed between the two oxygen atoms left after the elimination of phenyl groups from the phosphazene compound, no free hydroxyl group being present in the molecule, the amount of all phenyl groups in the crosslinked compound being 50 to 99.9% based on the total amount of the phenyl groups in the phosphazene compounds, (c) 1 to 60 parts by weight of an inorganic fibrous substance and (d) 1 to 60 parts by weight of magnesium hydroxide.

Growing community of inventors

Tokushima, Japan

Takashi Kameshima