Kuraray Co., Ltd.

Nobutaka Hiraoka

Atsuhiro Nakahara

Takashi Fukumoto

Hiroshi Ozawa

Toru Abe

Takuro Niimura

Taketomo Yamashita

Masayasu Ogushi

Yuuki Takasuka

A methacrylic resin composition comprising 100 parts by mass of a methacrylic resin having an amount of a terminal double bond of less than 0.012% by mole and an amount of a bonded sulfur atom of preferably less than 0.25% by mole; 5&#xd7;10to 9&#xd7;10part by mass of a metal element having an atomic number of not more than 20 (preferably lithium element and aluminum element); and 0.025 to 0.50 part by mass of a hindered phenol antioxidant such as 2,6-bis(1,1-dimethylethyl)-4-methylphenol, wherein the methacrylic resin composition, when being exposed to a nitrogen gas atmosphere at 290&#xb0; C. for 15 minutes, has a thermogravimetric retention of not less than 98% by mass.

Methacrylic resin composition and use thereof

Provided are a break-resistant copolymer having high transparency and heat resistance and also having a high tensile strain at break, and a molded article. A copolymer contains 80% by mass to 98% by mass of structural units derived from a methacrylic ester monomer and 2% to 10% by mass of ester structural units derived from a cyclic ketene acetal monomer. The copolymer has a weight average molecular weight of 80,000 or more and a molecular weight distribution of 1.75 to 3.80.

Copolymer, and molded article

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Tainai, Japan

Nobutaka Hiraoka