Process for the preparation of high density ethylene polymers in fluid bed reactor.

摘要

A catalytic process for preparing ethylene polymers having a density of ≧9.94 to ≦0.97 and a melt flow ratio of about ≧22 to ≦32 in a low pressure gas phase process at a productivity of ≧50,000 pounds of polymer per pound of Ti with a cytalyst formed from selected organoaluminum compounds, as activator and a precursor composition of the formula
<Chemistry id="chema01" num="0001"><Image id="ia01" he="7" wi="38" file="IMGA0001.TIF" imgContent="chem" imgFormat="TIFF" inline="no" /></Chemistry><UnorderedLists id="ula01" listStyle="none"><ListItem>wherein ED is a selected electron donor compound m is≧0.5 to ≦56</ListItem><ListItem>n is 0, 1 or 2</ListItem><ListItem>p is ≧2 to ≦116</ListItem><ListItem>q is>1.5m+2</ListItem><ListItem>R is a C<Sub>1</Sub> to C<Sub>14</Sub> aliphatic or aromatic hydrocarbon radical, or COR' wherein R' is a C, to C<Sub>14</Sub> aliphatic or aromatic hydrocarbon radical, and</ListItem><ListItem>X is selected from the group consisting of Cl, Br, I or mixtures thereof, which catalyst is in particulate form and impregnated in a porous inert carrier material.</ListItem></UnorderedLists>

The precursor is partially activated prior to the introduction thereof to the polymerization reactor.