Patent Number: 6,252,017

Title: Production of polyethylene having improved crack and/or impact resistance

Abstract: A process for producing polyethylene having improved crack resistance, the process comprising copolymerizing ethylene and an alpha-olefinic comonomer comprising from 3 to 8 carbon atoms, in the presence of a chromium-based catalyst in a first reactor, feeding the polyethylene copolymer thereby produced and the chromium-based catalyst to a second reactor, and in the second reactor copolymerizing ethylene and an alpha-olefinic comonomer comprising from 3 to 8 carbon atoms, in the presence of the chromium-based catalyst thereby to produce a second polyethylene product, the first and second polyethylene products forming a combined polyethylene having a monomodal molecular weight distribution.

Inventors: Debras; Guy (Frasnes-les-Gosselies, BE), Vandaele; Hugo (Bruges, BE)

Assignee: Fina Research, S.A.

International Classification: C08F 297/06 (20060101); C08F 297/08 (20060101); C08F 297/00 (20060101); C08F 210/00 (20060101); C08F 210/16 (20060101); C08F 002/01 (); C08F 004/22 ()

Expiration Date: 06/26/2018