Cp2TiCH2-containing catalyst for polymerization of difunctional ring compounds

摘要

A difunctional monomer containing a strained olefin ring and an unstrained olefin, ether group or other group polymerizable with Lewis acid or Ziegler-Natta coordination catalyst by forming a complex of the monomer and Cp2TiCH2 (Cp is eta 5-C5H5) and heating the complex in presence of excess monomer to above the decomposition point. A controlled, selective opening of the ring with the strained olefin occurs to form a linear, soluble polymer having the non-polymerized group pendant from the chain. An improved catalyst is formed by preparing the catalyst with a base such as 4-dimethylaminopyridine that forms an insoluble adduct with AlR2Cl which is precipitated and removed. Aluminum can also be eliminated by using a precursor of the formula: <IMAGE> (5) When compound (5) is reacted with monomer, the catalyst-monomer complex forms by elimination of a volatile component (isobutylene when R1 is Me and R is H) which is removed by venting.