English Abstract
Design of Efficient Early Transition Metal Complex Catalysts
for Synthesis of New Polyolefins by Precise Olefin Polymerization

Kotohiro NOMURA
Graduate School of Materials Science, Nara Institute of Science and Technology, Japan, Ikoma, Nara, Japan
Nippon Gomu Kyokaishi,(2008),81(10),400-407 General Review in Japanese

Selected successful examples for precise synthesis of new polyolefins by coordination insertion polymerization, especially by copolymerization of ethylene with new comonomer(s) using newly designed complex catalysts have been introduced. Efficient copolymerization of ethylene with styrene can be achieved by so called half-titanocene catalysts, and the ligand modification should play an essential key role especially for the efficient styrene incorporation.
Efficient introduction of functional group into polyolefins has also been achieved by the (direct) copolymerization using nonbridged half-titanocenes, and a new synthetic strategy for precise, efficient synthesis of polyolefins containing polar functionalities with uniform compositions (as well as with uniform molecular weight distribution) under mild (environmentally benign) conditions can be demonstrated.

Coordination Polymerization, Titanium Complex, Polyolefin, Copolymerization, Functionalization, Catalyst.