| abstract |
(57) [Summary] [Objective] In the production of a cyclic olefin homopolymer or a cyclic olefin / α-olefin copolymer, impurities such as a cyclic olefin oxide which cannot be removed by a distillation method can be easily obtained from the cyclic olefin monomer. By removing it, the polymerization activity of the catalyst will be greatly improved, and a deashing process will be realized, and equipment cost and energy cost will be reduced. [Structure] Cyclic olefins are contact-treated with inorganic substances such as alumina, activated alumina, silica, activated carbon, quick lime, aluminum silicate, diatomaceous earth, activated clay, kaolinite, and zeolite to produce cyclic olefin oxides, polymerization inhibitors, Purify by removing impurities such as antioxidants. Next, the cyclic olefin homopolymerized or copolymerized with the α-olefin is carried out using the cyclic olefin purified by the contact treatment with the above-mentioned inorganic substance. |