Mitsui Toatsu Chemicals, Incorporated

Mitsui Chemicals, Inc.

Teruyuki Nagata

Koju Okazaki

Nobuyuki Kajimoto

Masaru Wada

Tohru Miura

Yoshinobu Kanemura

Hideki Mizuta

Akihiro Tamaki

Katsuyoshi Sasagawa

Masayuki Furuya

Hidetoshi Hayashi

Kouki Fukumura

Hiroshi Sonoda

Chiyuki Kusuda

Shinichi Umeda

Hiroshi Naruse

Masao Imai

Hiroyuki Yamashita

Kazunari Okada

Akira Takahashi

Akihiro Yamaguchi

Kenichi Goto

Masahiko Kusumoto

Yoshihiro Irizato

Katsuji Watanabe

Yasuhiro Takano

Junko Naruse

Emiko Nishida

Hitoshi Nakayama

Kenichi Satou

Yoshimitsu Tanabe

Mamoru Tanaka

Chitoshi Shimakawa

Yoshitsugu Kono

Ryuichi Yamamoto

Takashi Kobayashi

Tomoko Kamashita

Masae Uchida

Kenichi Sugimoto

Seiichi Kobayashi

Shoji Tamai

Masanobu Ajioka

Keizaburo Yamaguchi

Hideaki Oikawa

Masakatsu Nakatsuka

Kiyoharu Hasegawa

Wataru Yamashita

Takeshi Nishimura

Takashi Kuroki

Satoshi Numata

Nobuya Kawauchi

Mitsumasa Umemoto

Hiroshi Suizu

Yutaka Hirai

Tamotsu Asano

Toshio Kitashima

Kousuke Yamamoto

Toshiyuki Kataoka

Hideki Umetani

Masazumi Takaoka

Yukiko Mori

Kenji Obata

Tsuyoshi Yasutake

Ken'ichi Goto

Takashi Shimaoka

Yoko Tajiri

Kotaro Shimizu

Osamu Kohgo

Hiroki Ohnishi

Tadao Yamada

Katsuju Watanabe

Katsuzi Watanabe

Mihaya Matsukawa

Motohiro Kase

Chiyuki Kikuchi

Halogenating agents

Nitrogen-based halogenating agents and process for preparing halogen-containing compounds

Fluorination agent and preparation and use of same

Disclosed are a fluorinating agent represented by the general formula (1):

The invention has disclosed a trifluoroacetoxylation agent and a preparation process of the agent, which is safe and ease to handle, very useful in industry, and represented by the formula (1);

Tetraalkylfluoroformamidinium trifluoroacetate and preparation process of same

A preparation process of an acetylene derivative comprising reacting a compound having a skeleton represented by the formula (1): ##STR1## in the molecular formula with a compound represented by the formula (2): ##STR2## wherein R.sup.1, R.sup.2 R.sup.3 and R.sup.4 are individually an alkyl group having 1 to 6 carbon atoms and can be the same or different, R.sup.1 and R.sup.3 can bond each other to form a ring, and R.sup.1 and R.sup.2 or R.sup.3 and R.sup.4 can be bond each other to form one or two heterocyclic rings: or with a compound represented by the formula (3): wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are the same as in the formula (2), and X.sub.1 is a ##STR3## chlorine, bromine or iodine atom.

Process for preparing acetylene derivative from a ketone compound

A polythiol having four or more functional groups, a process for producing the polythiol comprising reacting thiourea with a specific compound, a sulfur-containing urethane-based resin prepared from the polythiol and a lens made of the resin. The resin has a high refractive index, and low dispersion of refractive index, is lightweight, colorless and transparent, has no optical distortion, and has excellent characteristics in weatherability, dye-affinity, heat resistance, impact resistance and machinability.

Sulfur-containing urethane-based resin and composition and process for

A composition for polysulfide-based resin comprising a polythiol having 4 or more functional groups and a compound having a reactive unsaturated bond(s) and/or b epoxy group(s) and/or c iso(thio)cyanato group(s) in one molecule (however, a+b+c.gtoreq.2, and a and b are not simultaneously 0). A polysulfide-based resin obtained by curing the composition, an optical material comprising the resin, a lens consisting of the optical material and a method for producing the polysulfide-based resin are also set forth.

Polysulfide-based resin composition, polysulfide-based resin, and

In a process for reacting N,N'-dialkylethylenediamine with urea in an aprotic polar solvent to prepare 1,3-dialkyl-2-imidazolidinone, a process comprising progressing the reaction while continuously adding N,N'-dialkylethylnediamine and urea into the aprotic polar solvent. The process is a high-yield manufacturing process in industry capable of efficiently producing very high purity 1,3-dialkyl-2-imidazolidinone which contains less than 0.1% by weight of by-product 1,3-dialkyl-2-imidazolidinimine derived from the raw materials.

High purity 1,3-dialkyl-2-imidazolidinone and preparation process of same

A novel polythiol having four or more functional groups, a process for producing the polythiol comprising reacting thiourea with a specific compound, a sulfur-containing urethane-based resin prepared from the polythiol and a lens made of the resin. The resin has a high refractive index, and low dispersion of refractive index, is lightweight, colorless and transparent, has no optical distortion, and has excellent characteristics in weatherability, dye-affinity, heat resistance, impact resistance and machinability.

Process for preparing a sulfur-containing urethane-based plastic lens

One aspect of the present invention relates to a process for preparing plastic lenses having a high-refractive index comprising forming a mixture containing one or more polyisocyanate compounds; one or more active hydrogen compounds selected from the group consisting of a polyol compound having no sulfur atom, a polyol compound having at least one sulfur atom, and a polythiol compound having at least one sulfur atom in addition to the sulfur atom contained in mercapto group and at least one internal releasing agent and then casting and polymerizing the mixture. A second aspect of the present invention relates to a process for preparing a sulfur-containing urethane resin lens is here disclosed which comprises mixing polyisocyanate having two or more isocyanato groups, polythiol having two or more thiol groups and one or more surface active agent selected from the group consisting of fluorine-containing nonionic surface active agents, silicone-containing nonionic surface active agents, alkyl quaternary ammonium salts and acid phosphoric esters and then cast polymerizing the mixture in a mold made of a glass or a metal. Lenses prepared by the processes are also disclosed.

Plastic lenses having a high-refractive index, process for the

A preparation process of acyl halide or sulfonyl halide which comprises reacting corresponding carboxylic acid or sulfonic acid with a haloiminium salt represented by the general formula (1): ##STR1## wherein R.sup.1 and R.sup.2 are same or different lower alkyl groups, X is a halogen atom, and n is an integer of 2 or 3.

Preparation process of acyl halide or sulfonyl halide

The present invention discloses a sulfur-containing urethane-based resin composition of the present invention is directed to a sulfur-containing urethane-based resin composition which comprises a polythiol compound represented by formula (1): ##STR1## wherein X.sub.1, X.sub.2 and X.sub.3 each is a hydrogen atom or a mercapto group; x, y and z each is an integer of 0 to 8; and in their combinations, formula (1) has at least two mercapto groups, a polyiso(thio)cyanate compound, and a compound having two or more reactive unsaturated groups in an amount of 30 to 70% by weight based on the total weight of the composition, or a sulfur-containing urethane-based resin composition which comprises the polythiol compound represented by formula (1), the polyiso(thio)cyanate compound, the compound having two or more reactive unsaturated groups in an amount of 10 to 70% by weight based on the total weight, and a photopolymerization catalyst.

Sulfur-containing urethane-based resin composition, its resin, and

The invention provides a novel preparation process of a polycondensation type polymer, an excellent polymer which is represented by lactic acid and the preparation process of the polymer, a polycondensation agent used for the preparation process, and an intermediate. Specifically, the invention provides a preparation process of the polycondensation type polymer, for example, polyamide, polyimide, polythioester and polyester, comprising bonding a carboxyl group comprising compound with an active hydrogen group comprising compound in the presence of haloiminium salt. The invention provides excellent polylactic acid having a controlled D/L-isomer ratio in the repeating structural units and preparation process of polylactic acid, and further provides a haloiminium salt compound used for the preparation process and an intermediate compound of acid chloride.

Process for preparing polycondensation polymer compound

A composition for a urethane-base plastic lens, comprising:

Composition for urethane-base plastic lens, urethane-base plastic lens

Growing community of inventors

Fukuoka-ken, Japan

Teruyuki Nagata