Mitsubishi Rayon Company, Limited

Mitsubishi Chemical Corporation

Mitsuhiro Matsuo

Hisaaki Yoshimura

Masahiro Hayashida

Daisuke Nonaka

Yusuke Morita

Yoshihiro Tsukamoto

Tsuyoshi Kimura

Eri Kawai

Kazuyoshi Odaka

Kana Akeda

Yasushi Fujishige

Masahiko Morooka

Shinichirou Izumi

Seiji Nushi

Rie Akihara

A cured product that is reduced in warping and has high hardness can be obtained from an active energy ray-curable resin composition which uses a methacrylic acid ester polymer that has an acid value of 50 mg KOH/g or less and a transition metal content of 1 ppm or less, while containing 80% by mole or more of a polymer that has a double bond-terminated structure represented by formula (1). (In formula (1), R represents an alkyl group, a cycloalkyl group or an aryl group.) 

Methacrylic acid ester polymer, method for producing same, active energy ray-curable composition, and optical recording medium

There is provided a method capable of producing a methacrylic-based polymer excellent in pyrolysis resistance and excellent in fabricability in a high productivity. The method for producing a methacrylic-based polymer includes the following steps (1) and (2): step (1) of using a complete mixing reactor (A) to thereby obtain the first syrup, including specific steps; step (2) of using a reaction apparatus (D) including a plug flow mixer (B) and a plug flow reactor (C) to thereby obtain the second syrup, including specific steps.

Method for producing methacrylic-based polymer

Disclosed is an apparatus for producing a high-quality methacrylic polymer with good productivity, comprising a complete mixing type reactor, tubular reactorsandwhich have been serially connected, and a volatile removing instrument, wherein at least two of the tubular reactorsandare connected via a coolerfor cooling the reaction mixture. It is preferable that the cooleris a multitubular cooler and the tubular reactorsandare plug flow reactors.

Apparatus for producing methacrylic polymer and production method thereof

A plastic optical fiber cable includes: a bare plastic optical fiber including a core formed of a polymer containing a methyl methacrylate unit, and a clad layer including a layer formed of a specific fluorine-containing olefin resin at least in the outermost layer; and a coating layer around the bare plastic optical fiber, the coating layer including a light-shielding coating layer formed of a specific nylon resin composition, a functional coating layer (C) and a functional coating layer (D) in this order, where one of the functional coating layer (C) and the functional coating layer (D) is formed of a resin composition (I) containing a polybutylene terephthalate resin as a major component or an ethylene-vinyl alcohol copolymer as a major component; the other is formed of a specific nylon resin composition (II); and a ratio of the thickness of the functional coating layer (C) to the thickness of the functional coating layer (D) is set to fall within a specific range.

Plastic optical fiber cable and method of transmitting signal

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Otake, Japan

Mitsuhiro Matsuo