Catalyst system and process suitable for preparing polyolefins

• Main Authors: PETTIJOHN, TED M, PALACKAL, SYRIAC J, GEERTS, ROLF L, WELCH, M. BRUCE
• Format: Patent
• Language: Chinese; English
• Published: 01.05.1999
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAININGELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN,SULFUR, SELENIUM OR TELLURIUM; CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; CHEMISTRY; COMPOSITIONS BASED THEREON; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; METALLURGY; ORGANIC CHEMISTRY; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; THEIR PREPARATION OR CHEMICAL WORKING-UP; THEIR RELEVANT APPARATUS; TRANSPORTING

A method of preparing polyolefins with molecular weight distribution (Mw/Mn) greater than 3, in the presence of temperature range of 20 DEG C and 160 DEG C, atmospheric pressure range of 1 and 500 and a catalyst system to polymerize monoolefin or copolymerize at least two olefins, the catalyst system being prepared by admixing at least first and second metallocene, in which the first mettalocene being a bridged fluorenyl metallocene and the second metallocene being an unbridged metallocene, in which, under the same polymerization conditions, polyolefins having higher molecular weight is obtained when using the first metallocene is used as the only metallocene than when using the second metallocene as the only metallocene, in which the first metallocene is a bridged fluorenyl metallocene having the formula -(Z)-R^-(Z^)MeQk, wherein R^ is an organic group connecting Z and Z^; Z is substituted or unsubstituted fluorenyl; substituted or unsubstituted indene, substituted or unsubstitued cyclopentadienyl, tetrahydr