Zeon Corporation

Mitsubishi Heavy Industries Limited

Takuya Komatsubara

Takashi Houkawa

Kensaku Fujii

Yasuhiro Shimizu

Kenichi Arase

Kenji Umeda

Hiroya Nishioka

Yosuke Harauchi

Ayumi Sato

Kimihiro Kikugawa

The present invention provides: a copolymer (A) which is a copolymer obtained by copolymerizing one or plural cycloolefin monomers and one or plural acyclic olefin monomers, or a copolymer obtained by copolymerizing two or more cycloolefin monomers, wherein the glass transition temperature (Tg) of the copolymer is 100&#xb0; C. or higher, the refractive index of the copolymer is 1.545 or higher, and the Abbe's number of the copolymer is 50 or larger, and at least one of the cycloolefin monomers is a deltacyclene.

Copolymer, polymer, molding material and resin molded body

The present invention provides: a copolymer (A) which is a copolymer obtained by copolymerizing one or plural cycloolefin monomers and one or plural acyclic olefin monomers, or by copolymerizing two or more cycloolefin monomers, wherein a glass transition temperature (Tg) is 100&#xb0; C. or higher, a refractive index is 1.545 or higher, and an Abbe's number is 50 or larger; a polymer (B) selected from: a ring-opening homopolymer obtained by ring-opening polymerization of only a monomer represented by formula (I), a ring-opening copolymer obtained by ring-opening copolymerization of the monomer represented by formula (I) and a monomer capable of ring-opening copolymerization with the monomer represented by formula (I), a hydrogenated product of the ring-opening homopolymer and a hydrogenated product of the ring-opening copolymer; a forming material containing the copolymer (A) or the polymer (B); and a resin formed article obtained by forming the forming material. 

An optical polymer satisfying an expression: (&#x3b7;A&#x2212;&#x3b7;B)/&#x3b7;B&#xd7;100&#x3c;60, where, &#x3b7;A is the melt viscosity of the optical polymer measured at a temperature of 290&#xb0; C. and a shear rate of 200 (l/s), and &#x3b7;B is the melt viscosity of the optical polymer measured at a temperature of 290&#xb0; C. and a shear rate of 2000 (l/s).

Optical polymer and optical element obtained by forming thereof

A fixture for connecting rotors of a rotary machine includes: an axial member provided with a column-like fitting portion which is disposed inside of a first bolt hole and fits the first bolt hole; and a sleeve provided with a cylindrical fitting portion which is disposed inside of a second bolt hole and fits the second bolt hole. The axial member further includes a tapered portion which is formed on an end portion of the column-like fitting portion, and is gradually reduced in diameter from the first bolt hole toward the second bolt hole. The cylindrical fitting portion of the sleeve is formed with a tapered hole which is gradually expanded in diameter from the second bolt hole toward the first bolt hole around an axis of the sleeve.

Growing community of inventors

Tokyo, Japan

Takuya Komatsubara