Process for producing liquid ethylene-type random copolymers

US5675049A · kind A · utility

Inventors

• Walter Vermeiren · Houthalen-Helchteren, BE
• Patrick Brems · Worms, DE
• Herve Hinnekens · Wetteren, BE

Key dates

• Filing date: Aug 31, 1993
• Grant date: Oct 7, 1997
• Expiry date: Aug 31, 2013

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F4/65927
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process is provided for producing liquid ethylene-type random copolymers by copolymerizing ethylene and a C.sub.3 --C.sub.2 O alpha-olefin in the presence of a catalyst comprising an alumoxane and a stereorigid metallocene compound described by the formula: EQU R"(CpR.sub.5)(CpR'.sub.5)MeQ.sub.2 wherein each Cp is a cyclopentadienyl or substituted cyclopentadienyl ring; each R and R' is the same or different and is hydrogen or a hydrocarbyl radical having 1-20 carbon atoms or two R or two R' together form a hydrocarbyl radical having 2-20 carbon atoms; R" is a structural bridge between the two Cp rings imparting stereorigidity to the compound; Me is a transition metal of Group IVb of the periodic table; and each Q is a hydrocarbyl radical having 1-20 carbon atoms or is a halogen. A portion of the alumoxane may be replaced with an alkylaluminum.