| 摘要 |
<p>A catalyst composition formed from selected organoaluminum compounds and a precursor composition of the formula
<Chemistry id="chema01" num="0001"><Image id="ia01" he="9" wi="44" file="IMGA0001.TIF" imgContent="chem" imgFormat="TIFF" inline="no" /></Chemistry>wherein ED is a selected electron donor compound R is a C<Sub>1</Sub> to C<Sub>14</Sub>, aliphatic or aromatic hydrocarbon radical, or COR' wherein R' is a C<Sub>1</Sub> to C<Sub>14</Sub> aliphatic or aromatic hydrocarbon radical, X is Cl, Br, 1, or mixtures thereof. Filler is an inert organic or inorganic compound, and, based on the total weight of such composition
<UnorderedLists id="ula01" listStyle="none"><ListItem>m is ≧ 0.5 to ≦ 56</ListItem><ListItem>in is 0 or 1</ListItem><ListItem>p is ≧ 6 to ≦ 116</ListItem><ListItem>q is ≧ 2 to ≦ 85</ListItem></UnorderedLists>r has a value such that the percent filler is from about 10 to about 95 weight percent based on the total weight of the precursor composition.</p><p>A process for preparing such precursor composition by spray drying it from a slurry or solution in said electron donor compound, using atomization.</p><p>A process for using said catalyst to readily prepare ethylene polymers having a density of about ≧0.91 to ≦0.97, a melt flow ratio of ≧22 to ≦32 and a bulk density of about 18 to 32 lbs/ft<Sup>3</Sup> and controlled particle shape and size in a low pressure gas phase process at a productivity of ≧50,000 pounds of polymer per pound of Ti.</p> |
