METHOD FOR PRODUCING CYCLIC OLEFIN COPOLYMER

• Main Authors: OKANO YOSHIMICHI, SUZUKI TAKESHI, YAEGASHI NORIYUKI
• Format: Patent
• Language: English; Japanese
• Published: 10.12.2015
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP

PROBLEM TO BE SOLVED: To provide a method for producing a copolymer, which enables a copolymer having excellent mechanical characteristics and having a molecular weight suitable for usual fabrication to be obtained with less amount of a catalyst in better yield.SOLUTION: The method for producing a copolymer comprises a polymerization process of polymerizing at least a cyclic olefin monomer (A) derived from norbornene and an α-olefin monomer (B) derived from C4 to C12 α-olefins in the presence of a non-crosslinked ketimide-type half-titanocene catalyst and a cocatalyst comprising an alkylaluminoxane to obtain a copolymer. An amount of the copolymer obtained in the polymerization process is 1000 g or more per 1 g of the half-titanocene catalyst, and a number average molecular weight of the copolymer is 20,000 or more and 200,000 or less. 【課題】より少ない触媒量で、力学特性に優れ、かつ通常の成形加工に適した分子量の環状オレフィン共重合体をより多く得ることができる共重合体の製造方法を提供する。【解決手段】非架橋のケチミド型ハーフチタノセン触媒とアルキルアルミノキサンからなる助触媒との存在下で、少なくとも、ノルボルネンから誘導される環状オレフィンモノマー（Ａ）とＣ４〜Ｃ１２のα−オレフィンから誘導されるα−オレフィンモノマー（Ｂ）とを重合させて共重合体を得る重合工程を含み、前記重合工程において得られる前記共重合体の量は、前記ハーフチタノセン触媒１ｇ当たり１０００ｇ以上であり、かつ、前記共重合体の数平均分子量は２０，０００以上２００，０００以下である、共重合体の製造方法。【選択図】なし