Lg Chem, Ltd

Il Gu Jung

Dai Seung Choi

Sung Ho Chun

Sung Cheol Yoon

Young Whan Park

Jungmin Lee

Young Keun Chung

TaeSun Lim

Provided is a method of preparing a cyclic olefin polymer by addition polymerization of a cyclic olefin monomer, the method including contacting a metal catalyst complex represented by Formula 1 below with a cyclic olefin monomer represented by Formula 2 below:[M(L)(L')(L)][Ani]&#x2003;&#x2003;&#x3c;Formula 1&#x3e; wherein M is a Group X metal; [M(L)(L&#x2032;)(L)] is a cationic complex; Lis an anionic hydrocarbyl-containing ligand; L&#x2032;is a neutral ligand; Lis an N-heterocyclic carbene ligand; [Ani] is an anion capable of weakly coordinating with the metal M; x is 1 or 2; y is 0 to 4; z is 1 or 2; 2&#x2266;x+y+z&#x2266;6; a and b are respectively the number of cations and the number of anions capable of weakly coordinating with the metal M and are each a number of 1-10 which is used to satisfy the net charge balance of the metal catalyst complex, and wherein for each of L, L&#x2032;, and L, when a plurality of ligands are present in a molecule of the metal catalyst complex, the ligands may be the same or different, and  wherein m is an integer of 0 to 4; and R, R&#x2032;, R&#x2033;, and R&#x2033;&#x2032;are each independently a polar functional group or a nonpolar functional group. According to the method of the present invention, a high molecular weight cyclic olefin addition polymer can be produced in a high yield even when using a polar functional group-containing cyclic olefin monomer. A polymer produced using the method shows good thermal stability.

Polymerization methods using the catalysts

Provided is a metal catalyst complex for preparing a cyclic olefin-based polymer by addition polymerization of a cyclic olefin-based monomer, which is represented by Formula 1 below:[M(L)(L')(L)][Ani]&#x2003;&#x2003;&#x3c;Formula 1&#x3e; The metal catalyst complex has an N-heterocyclic carbene ligand, and thus, is excellent in thermal stability and reactivity.

Catalysts for polymerizing cyclic olefin

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Chungcheongbuk-do, South Korea

Il Gu Jung