BIS(SALICYLALDIMINATO)TITANIUM COMPLEX CATALYSTS, HIGHLY SYNDIOTACTIC POLYPROPYLENE BY A CHAIN-END CONTROL MECHANISM, BLOCK COPOLYMERS CONTAINING THIS
摘要
<p>Bis(salicylaldiminato)titanium complex with optionally subsituted phenyl or cyclohexyl on nitrogen catalyzes highely syndiospecific polymerization of propylene. Syndiotactic polypropylene with defects of the type rmr having [rrrr] content greater than 0.70 and block copolymer containing block(s) of the syndiotactic polypropylene and block(s) of poly(ethylene-co-proéylene) and/or poly(alpha-olefin-co-propylene) are obtained. Certain of the catalysts provide living polymerization. Living olefin polymers and olefin terminated oligomers and polymers are also products.</p>