Patent ID: 6472484
Filing Date: 2002-10-29
Classification: C08F,Y10S

Abstract:
A method of producing a polyolefin composition comprising copolymerizing at least two olefins selected from ethylene or &agr;-olefins having 3 to 20 carbon atoms using at least two gas phase fluidized bed reactors in the presence of a transition metal compound catalyst, wherein copolymerization of the reactor in a second or later stage is conducted in the presence of a copolymer produced in the previous stages, and wherein a saturated aliphatic hydrocarbon exists in each reactor in a concentration from 0.1 to 30 mol %, and the ratio of the concentration (C2) of a saturated aliphatic hydrocarbon in a reactor of a second stage to the concentration (C1) of a saturated aliphatic hydrocarbon in a reactor of a first stage (C2/C1) is 0.13 or more.