公开(公告)号：US11795256B2

公开(公告)日：2023-10-24

申请号：US18003424

申请日：2021-06-23

Applicant: Polyplastics Co., Ltd.

Inventor： Naoyuki Wakitani ,  Tomoyuki Tada

IPC: C08F4/64 ,  C08F4/76 ,  C08F232/04 ,  C08F2/06 ,  C08F4/08 ,  C08F4/30 ,  C08K3/02 ,  C08F232/06 ,  C08F4/6592

CPC classification number: C08F232/04 ,  C08F2/06 ,  C08F4/083 ,  C08F4/30 ,  C08F4/76 ,  C08K3/02 ,  C08F4/6592 ,  C08F232/06 ,  C08F2410/04 ,  C08K2003/026

Abstract: A production method for a cyclic olefin copolymer which is capable of efficiently producing a cyclic olefin copolymer by copolymerizing monomers including a norbornene monomer and ethylene while suppressing the formation of a polyethylene-like impurity, and a catalyst composition for the copolymerization of a norbornene monomer and ethylene. Monomers including a norbornene monomer and ethylene are polymerized in the presence of a metal-containing catalyst, and the metal-containing catalyst has a structure in which a nitrogen atom is bonded to a transition metal of Group 4 of the periodic table and an atom of Group 15 of the periodic table.

公开(公告)号：US20240026053A1

公开(公告)日：2024-01-25

申请号：US18029786

申请日：2021-09-03

Applicant: Polyplastics Co., Ltd.

Inventor： Tomoyuki Tada ,  Naoyuki Wakitani ,  Atsushi Nakano

IPC: C08F232/08 ,  C08F210/02 ,  C08K5/12 ,  G02B1/04

CPC classification number: C08F232/08 ,  G02B1/04 ,  C08K5/12 ,  C08F210/02

Abstract: A transparent article is obtained by molding a cyclic olefin copolymer or a resin composition containing the cyclic olefin copolymer. The cyclic olefin copolymer is obtained by a process that at least includes a step of preparing a norbornene monomer and ethylene as monomers in a polymerization vessel and a step of polymerizing the monomers in the polymerization vessel in the presence of a metal-containing catalyst. The metal-containing catalyst satisfies predetermined conditions.

公开(公告)号：US20230391906A1

公开(公告)日：2023-12-07

申请号：US18247420

申请日：2021-09-16

Applicant: Polyplastics Co., Ltd.

Inventor： Tomoyuki Tada ,  Naoyuki Wakitani ,  Hiroyuki Komatsu

IPC: C08F210/02 ,  C08F4/6592

CPC classification number: C08F210/02 ,  C08F4/6592

Abstract: A production method for a cyclic olefin copolymer which is capable of efficiently producing a cyclic olefin copolymer by copolymerizing monomers including a norbornene monomer and ethylene while suppressing the formation of a polyethylene-like impurity. The monomers including a norbornene monomer and ethylene are polymerized in the presence of a metallocene catalyst containing a cyclopentadiene ligand which is substituted with an alkyl group optionally substituted with a halogen atom, or a trialkylsilyl group, and satisfies specific conditions for substituent(s).