Mitsui Chemicals, Inc.

Mitsui Toatsu Chemicals, Incorporated

Hidetoshi Hayashi

Seiichi Kobayashi

Kouki Fukumura

Hiroshi Sonoda

Teruyuki Nagata

Junko Naruse

Nobuo Kawato

Osamu Kohgo

Masanori Iwazumi

Hironori Kuboi

Kazunari Okada

Akira Takahashi

Hideaki Oikawa

Mamoru Tanaka

Kenichi Goto

Yasuhiro Takano

Tomoyuki Ando

Masakazu Murakami

Tsuyoshi Yasutake

Takashi Shimaoka

Ken'ichi Goto

Masao Imai

Koju Okazaki

Atsuo Otsuji

Masayuki Furuya

Masaru Wada

Akinori Ryu

Masaru Kawaguchi

Chitoshi Shimakawa

Hiroshi Naruse

Hideki Mizuta

Mitsuo Nakamura

Tadashi Araki

Hiroyuki Morijiri

Masahiko Kusumoto

Shinichi Usugi

Toshio Kitashima

Hideki Umetani

Mamoru Takashina

Hideki Yamamoto

Yasuhiro Nukii

Norihiko Fukatsu

Naoki Tomoshige

Homare Yumoto

Shinya Tsuchiyama

Junichi Ishiyama

Touru Miura

A polymerizable composition for polythiourethane optical materials comprising a compound represented by the general formula (1),M(L)n&#x2003;&#x2003;(1)

Polymerizable composition for polythiourethane optical material

The present invention provides is a method for producing 3-mercaptopropionic acid from 3-mercaptopropionamide or a salt thereof with the use of an amidase. The method enables the production of 3-mercaptopropionic acid on an industrial scale through an enzymatic reaction.

Method for producing 3-mercaptopropionic acid or salt thereof

A polymerizable composition including a compound represented by following General Formula (1): 

Polymerizable composition, and resin and optical part using the same

By using an amine hydrochloride represented by the formula (1) as a catalyst, a polythiourethane resin which is suitably used for a transparent resin for optical use, can be obtained without using an organotin compound which has been conventionally used as a catalyst for polythiourethane resins and without being affected by the acidity of an additive: wherein R, Rand Rindependently represent a monovalent or higher valent linear aliphatic, branched aliphatic, cyclic aliphatic or aromatic organic residue which may have a hydroxyl group or an amino group; and R, Rand Rmay be arbitrarily bonded to each other to form a ring.

Polymerization catalyst for polythiourethane optical material, polymerizable composition containing the same, polythiourethane resin obtained from the composition, and process for producing the resin

The polymerization catalyst for a polythiourethane-based optical material of the present invention includes a sulfonate represented by the following general formula (1). Furthermore, in the formula, R, R, Rand Reach independently represent an alkyl group having 1 to 18 carbon atoms, R, R, Rand Rmay be bonded to each other to form a ring. Rrepresents a hydrogen atom or an alkyl group having 1 to 18 carbon atoms, and X represents a nitrogen atom or a phosphorus atom. 

Polymerization catalyst for polythiourethane-based optical material, polymerizable composition containing the catalyst, optical material obtained from the composition, and method for preparing the optical material

The polymerizable composition for an optical material of the present invention comprises a phenylene diisocyanate, at least one polythiol compound selected from the group consisting of 4-mercaptomethyl-1,8-dimercapto-3,6-dithiaoctane, 4,8-, 4,7- or 5,7-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, 2,5-bis(mercaptomethyl)-1,4-dithiane, bis(mercaptoethyl)sulfide, 1,1,3,3-tetrakis(mercaptomethylthio)propane, 4,6-bis(mercaptomethylthio)-1,3-dithiane, 2-(2,2-bis(mercaptomethylthio)ethyl)-1,3-dithietane, 1,1,2,2-tetrakis(mercaptomethylthio)ethane 3-mercaptomethyl-1,5-dimercapto-2,4-dithiapentane and tris(mercaptomethylthio)methane.

Polymerizable composition for optical material, optical material, and method for preparing the optical material

Polymerizable compositions containing at least one metal thietane compound represented by general formulas (110), (201) or (120), respectively, wherein said formulas are as follows: and wherein the identified moieties and n, p, q and r are defined.

Metal thietane compound, polymerizable composition containing the compound, resin and use of the resin

A thietane compound represented by the following formula (30): in formula (30), A represents an OH group or an SH group.

Thietane compound, polymerizable composition containing the same, resin, method for producing the resin, and use of the polymerizable composition and the resin

Disclosed is a metal thietane compound represented by the following general formula (120),  (wherein, in the above general formula (120), M is a member selected from the group consisting of Bi, Sb, Ti, Zr and Ta; Xand Xare each independently a sulfur atom or an oxygen atom; Ris a divalent organic group; the bond between M and T shown by a dotted line and a solid line represents a single or double bond; m is an integer of 0 or 1 or more; n is the number of valence of M; and p is an integer of equal to or more than 1 and equal to or less than n, provided that when r is 1, q is 0 and Y is a monovalent inorganic or organic group; when r is 1 and n-p-q is 2 or more, a plurality of Ys contained are each independently selected from monovalent inorganic or organic groups; when r is 1 and n-p-q is 2 or more, a plurality of Ys may be bonded to each other to form a ring containing M; when r is 2, n-p-q is 1 or 2 and Y is a divalent group; when r is 2 and n-p-q is 2, two Ys may form a ring together with two Ms; and when r is 2 and q is 2, a plurality of Ts contained are each independently selected from inorganic or organic groups).

An isocyanate has been widely used as a starting material for the production of a polyurethane material, a polyisocyanurate material or the like which is suitably applicable to the field of optical materials. Disclosed is a process for producing an isocyanate which includes a step for producing the isocyanate in the form of a hydrochloride with improved productivity. A process for producing a linear or cyclic aliphatic isocyanate comprising the step of reacting a linear or cyclic aliphatic amine with hydrogen chloride to yield a hydrochloride of the linear or cyclic aliphatic amine, the step being performed under a pressure higher by 0.01 MPa or more than the atmospheric pressure.

Process for production of isocyanate, isocyanate produced by the process, and use of the isocyanate

Disclosed is an internal mold release agent for the production of polythiourethane optical materials, which is obtained by mixing an acidic phosphate ester compound and at least one metal selected from the group consisting of Zn, Cu, Fe, Ga, Bi, Al and Zr. The internal mold release agent for the production of polythiourethane optical materials contains the metal in an amount of 0.01 to 20 weight %.

Internal mold release agent for production of polythiourethane optical material

A method for producing an &agr;,&agr;-difluorocycloalkane at high purity with good efficiency, which comprises a step of treating a fluorocycloalkene with hydrogen fluoride wherein the fluorocycloalkene has one fluorine atom directly bonded to a carbon atom of carbon&mdash;carbon unsaturated double bond, more preferably, a step of directly adding the hydrogen fluoride to a reaction mixture obtained by treating the cycloalkanone with the de-oxygen fluorinating agent.

Process for producing &agr;, &agr;-difluorocycloalkane compound

1,3-Bis(3-aminophenoxy)benzene effective, for example, as a raw material for highly heat-resistant polyimide is produced industrially at a high yield by a reaction between 1,3-difluorobenzene and an alkali metal salt of 3-aminophenol.

Process for producing 1,3-bis(3-aminophenoxy)benzene

Halogenating agents

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

Growing community of inventors

Omuta, Japan

Hidetoshi Hayashi