Osaka Gas Chemicals Co., Ltd.

Samsung Electronics Co., Ltd.

Shinsuke Miyauchi

Yukika Yamada

Eigo Miyazaki

Hiroko Endo

Nobuji Sakai

Shinichi Kamei

Yoshiya Ota

Rie Yasuda

Provided are a retardation film that has a high heat resistance, has excellent formability and handleability even in a single-layer structure, has a negative thickness-direction retardation Rth value, and is suitable as a negative A-plate or a positive C-plate and a method for producing the film. The retardation film is formed of a stretched film of a polyester resin, contains a unit (A1) represented by the formula (1) as a diol unit (A) and a unit (B1) represented by the formula (2a) or (2b) as a dicarboxylic acid unit (B), and is a negative A-plate or a positive C-plate. In the formulae, Zand Zrepresent an aromatic hydrocarbon ring, R, R, R, Rand Rrepresent a substituent, k, p1 and p2 denotes an integer of 0 to 8, q denotes an integer of 0 to 4, m1, m2, n1 and n2 denotes an integer of not less than 0, Aand Arepresents an alkylene group, and A, Aand Arepresents a divalent hydrocarbon group.

Retardation film and method for producing the same

A triazine ring-containing polymer having a high refractive index and a low birefringence, and being capable of being subjected to injection molding, wherein the polymer having a repeating unit of *-[A-B-]-*, including a structural unit A derived from a triazinedithiol compound, and a structural unit B including an aromatic hydrocarbon group; and a thermoplastic resin, a thermoplastic article, and an optical part including the polymer.

Triazine ring-containing polymer, and thermoplastic resin, article, and optical part including same

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Osaka, Japan

Shinsuke Miyauchi