Asahi Glass Company, Limited

Masakuni Sato

Hidenobu Murofushi

Shin Tatematsu

Norihide Sugiyama

Kimiaki Kashiwagi

Takashi Okazoe

Kunio Watanabe

Atsushi Watakabe

Koichi Yanase

Yasuhiro Suzuki

Susumu Saito

Hiroshi Yamamoto

Masahiro Ito

Toshiyuki Tanaka

Kazuya Oharu

Tetsuji Shimohira

Isamu Kaneko

Naoto Ota

Nobuyuki Kasahara

Yoshinobu Takano

Gen Ogawa

To provide a plastic optical fiber using amorphous fluorinated polymers whereby transmission loss and bending loss are low, no cracking takes place during stretching, and a wide range of molding conditions is acceptable. A plastic optical fiber comprising an inner layer, an outer layer having a refractive index lower than the refractive index of the inner layer, and a protective coating layer covering the outer periphery of the outer layer, wherein the inner layer contains an amorphous fluorinated polymer (a) having no C&#x2014;H bond, the outer layer contains an amorphous fluorinated polymer (c) which may have a C&#x2014;H bond only at a terminal of the main chain, the glass transition temperature (Tgc) of the fluorinated polymer (c) is at least the glass transition temperature (Tga) of the fluorinated polymer (a), the plastic optical fiber is a stretched one, the fracture elongation of the fluorinated polymer (a) and the fracture elongation of the fluorinated polymer (c) are at least 120% and larger than the stretching ratio.

Plastic optical fiber and method for its production

The present invention provides a method for preparing a compound of CFCFCFOCF&#x2550;CFby pyrolyzing a compound expressed by CFCFCFOCF(CF)COOCFCF(CF)OCFCFCFin a gas phase at a temperature of from 200&#xb0; C. to 500&#xb0; C.

Method for preparing unsaturated compound by pyrolysis reaction

A process for producing a fluorinated ester through a small number of steps, is presented. The process for producing a fluorinated ester, comprises a transesterification step in which R&#x2014;COOCF&#x2014;Rand R&#x2014;CHOH are subjected to a transesterification reaction to obtain R&#x2014;COOCH&#x2014;R, and a fluorination step in which the obtained compound is fluorinated to obtain a reaction product containing R&#x2014;COOCF&#x2014;R. Here, in the formulae, Ris a monovalent organic group, and Ris the same group as Ror a monovalent organic group obtained by fluorination of R.

Process for producing a fluorinated ester, a fluorinated acyl fluoride and a fluorinated vinyl ether

A novel polymer useful as an optical resin material excellent in heat resistance, a novel monomer for obtaining the polymer, etc., are provided. A fluorinated diene represented by CF &boxH;CF(CF ) C(CF )ROCF&boxH;CF (wherein R is a fluorine atom or a trifluoromethyl group, and n is an integer of from 1 to 3), and a polymer thereof.

Fluorinated compound, method for its production and polymer thereof

Fluorine-containing diene, its production method and its polymer

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Kanagawa, Japan

Masakuni Sato