Mitsubishi Chemical Corporation

Masahiko Morooka

Yoshiaki Murayama

Hiroshi Nakanishi

Kazuyoshi Odaka

Mitsuhiro Matsuo

Eri Kawai

Kana Akeda

Takao Marutani

Shinichirou Izumi

Seiji Nushi

A methacrylic resin excellent in moldability, solvent resistance, mechanical properties and heat resistance is provided. A method for producing a methacrylic resin excellent in productivity is provided. A methacrylic resin having 99.1% by mass or more and 99.9% by mass or less of a repeating unit derived from methyl methacrylate, 0.1% by mass or more and 0.9% by mass or less of a repeating unit derived from alkyl acrylate, and a proportion of the molecular weight component of &#x2155; or less of the peak molecular weight Mph in the high molecular weight region side obtained from an elution curve by a gel permeation chromatography of the methacrylic resin is 7% or more and 40% or less.

Methacrylic resin, method for producing methacrylic resin, shaped article and automobile

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

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Tokyo, Japan

Masahiko Morooka