Mitsubishi Rayon Company, Limited

Mitsubishi Chemical Corporation

Nitto Chemical Industry Co., Ltd.

Nitto Chemical Industries Co., Ltd.

Keiichi Sakashita

Yoshitaka Kageyama

Jun Nakauchi

Seiji Hayashi

Tetsuya Ikemoto

Tetsuya Noda

Fuminori Nakaya

Kenji Mori

Ichiro Watanabe

Akihiro Sakimae

Yoshihiro Sako

Yoshiko Irie

Taeko Oonuma

Mioko Uematsu

Yosuke Matsunaga

Osamu Yamamoto

Tetsuji Nakamura

Yoshimasa Kobayashi

Yoshihiro Tsukamoto

Yasuo Ogawa

Teruyuki Yamada

Eiji Ozaki

Hiroyuki Nogami

Toshitaka Uragaki

Tomoyuki Kotani

Takafumi Asai

Amane Aoyagi

Keiji Iwasaka

Hikaru Nakayama

Yoshihiko Sako

Shiro Miyamoto

A high-quality flame-resistant fiber and carbon fiber at low costs in preparing a flame-resistant fiber and a carbon fiber by efficiently performing a flame retardation process in a short time as compared with a conventional technology are described. [1] If a polyacrylonitrile (PAN) polymer is degenerated with an oxidizing agent containing a thiolate compound and a nitrogen atom in a polymer, and the degenerated polymer is formed into threads so as to prepare a flame-resistant PAN fiber. [2] A flame-resistant PAN fiber is prepared by degenerating a PAN precursor fiber in a solution including a thiolate compound and an oxidizing agent containing a nitrogen atom. The flame-resistant PAN fiber obtained by the preparation method is heated at 300&#xb0; C. or more to 3000&#xb0; C. or less, and, thus, a carbon fiber having an excellent mechanical strength can be obtained.

Partially cyclized polyacrylonitrile polymer, polyacrylonitrile flame-resistant polymer, polyacrylonitrile flame-resistant fiber, carbon fiber, and preparation methods thereof

To provide a novel compound having both a surface-activating ability and a polymerization controlling ability. A compound represented by the following general formula (1) or (2):  wherein, Rand Rare an organic group having the hydrophile-lipophile balance (HLB) determined by Griffin's method of 3 or more. The definitions of R, R, R, R, Z, p and q are described in the Description.

Chain transfer agent and emulsion polymerization using the same

An object of the invention is to provide a molding with suppressed coloring which has good weather resistance and in which the advantageous effect does not decrease with time. The present invention provides a molding material comprising a polymer (A) obtained by polymerizing 0.01 to 35 mol % of monomer (a1) represented by a specified formula (1) and 65 to 99.99 mol % of monomer (a2) whose main component is methylmethacrylate.

Molding material and molding

To provide a novel compound having both a surface-activating ability and a polymerization controlling ability. A compound represented by the following general formula (1) or (2): 

Disclosed are a method for producing a polymer by a polymerization of a mixture at a temperature of 210&#xb0; C. or lower, wherein the mixture comprises 0.01 to 35 mol % of a monomer or a polymer thereof which has a piperidine skeleton represented by formula (1), and a molded body thereof.  Rrepresents a hydrogen atom or a methyl group, X represents an oxygen atom, an imino group, or a specific oxygen atom containing a hydrocarbon group, and Rand Rrepresent a hydrogen atom, a linear alkyl group with C1 to C8, a branched alkyl group with C1 to C8, an alicyclic hydrocarbon with C6 to C8, or an aryl group, wherein Rand Rmay also form a cyclic structure.

Method for producing polymer using monomer having piperidine skeleton, and molded body

There is provided a polymer composition comprising 5 to 100% by mass of a unit (A) of a lactone compound represented by a general formula (1) and 0 to 95% by mass of a unit (B) of (meth)acrylate as constitutional units, wherein the unit (A) of a lactone compound comprises a unit of an (S) isomer represented by a general formula (2) and a unit of an (R) isomer represented by a general formula (3) at a mass ratio of from 70/30 to 30/70; and wherein the polymer composition has a total light scattering loss of not more than 100 dB/km. The polymer composition is excellent in heat resistance and transparency.

Polymer composition, plastic optical fiber, plastic optical fiber cable, and method for manufacturing plastic optical fiber

Optically active .alpha.-substituted carboxylic acid derivatives and

Optical active compounds which are chemically stable, are not colored, have a good optical stability, and which give a liquid crystal composition having a large spontaneous polarization when the compound is incorporated, are provided. The optical active compound have an asymmetric carbon atom fixed by a .delta.-valerolactone ring and the permanent dipole moment derived from the carboxylic group is fixed by the .delta.-valerolactone ring and two alkyl groups which can be regarded as a part of a measogen.

Optically active compound having a .delta.-valerolactone ring and liquid

An organic acid ester of ascorbic acid or erythorbic acid is produced by reacting ascorbic acid or erythorbic acid with an organic acid enol ester in an organic solvent with a solubility of ascorbic acid or erythorbic acid of more than 0.3% at 25.degree. C. in the presence of an active lipase.

Process for the stereoselective esterification of ascorbic or erythorbic

A process for producing an L-amino acid from the corresponding DL- and/or L-amino acid amide represented by the general formula: ##STR1## wherein R is a substituted or unsubstituted alkyl group having one to 4 carbon atoms, a substituted or unsubstituted phenyl group, or a substituted or unsubstituted aralkyl group, by action of an enzyme having hydrolytic activity to L-amino acid amides which is produced by Enterobacter cloacae or Pseudomonas sp.

Process for producing L-amino acids

An optically active compound represented by the formula: ##STR1##

Optical active compound and liquid crystal composition

Disclosed is an optically active compound represented by the formula: ##STR1## wherein R.sub.1 and R.sub.2 are alkyl, alkenyl or alkoxy-alkyl, which may be substituted by halogen, X and U are a direct bond, --O--, --COO-- or --OCO--, Y and Z are a direct bond, --COO--, --OCO--, --CH.sub.2 O-- or --OCH.sub.2 --, A.sub.1 and A.sub.2 are phenylene, cyclohexylene or a phenylene- or cyclohexylene-containing group, p and q are 0 or 1, C* is an asymmetric carbon atom, with the proviso that when Z is a direct bond, q is 0, R.sub.2 is alkyl, Y is a direct bond, --OCO-- or --OCH.sub.2 --. The optically active compound is used as a ferroelectric liquid crystal or an additive to a ferroelectric or non-ferroelectric liquid crystal.

Optically active compound

Disclosed is an optically active substance represented by the formula: ##STR1## wherein m is an integer of 1 to 14, Y is ##STR2## R is --C.sub.n H.sub.2n+1, --OC.sub.n H.sub.2n+1, --OCOC.sub.n H.sub.2n+1 or --COOC.sub.n H.sub.2n+1 (in which n is an integer of 1 to 18), each of the asterisked carbon atoms is an asymmetric carbon atom, X a single bond, --CO.sub.2 --, or --OCO--, and A.sub.1 and A.sub.2 is hydrogen, fluorine, chlorine, bromine, cyano or methoxy.

Optically active substance and liquid crystal composition comprising same

Disclosed is an optically active compound represented by the formula: ##STR1## or a single bond, Z stands for a hydrogen atom, a halogen atom or a cyano group, R.sub.1 stands for an alkyl group or fluoroalkyl group having 1 to 18 carbon atoms, R.sub.2 stands for an alkyl group or alkoxy group having 1 to 18 carbon atoms, and *C stands for the asymmetric carbon atom. This compound is used as a ferroelectric liquid crystal or an additive to a ferroelectric liquid crystal.

Optically active compound and liquid crystal composition

An optically active compound having a .delta.-valerolactone ring which is a ferroelectric liquid crystal and is represented by the following general formula (I): ##STR1## wherein m is an integer of from 1 to 8, Z is a group represented by the following formula: ##STR2## in which each of l and k is a number of 1 or 2 and l and k satisfy the requirement of 2.ltoreq.(l+k).ltoreq.3,

Growing community of inventors

Otake, Japan

Keiichi Sakashita