Back to results
US 6,635,728 B2Granted
Preparation of ultra-high-molecular-weight polyethylene
AssigneeEquistar Chemicals, LP
InventorJia-Chu Liu
Life of this patent
Estimating the term…
Abstract
A process for making an ultra-high-molecular-weight polyethylene (UHMWPE) is disclosed. The process is performed with a supported quinolinoxy-containing single-site catalyst in the presence of a non-alumoxane activator, but in the absence of an α-olefin, an aromatic solvent, and hydrogen. The process significantly increases the catalyst activity and the UHMWPE produced has improved tensile and impact properties.
Claims10
A process for producing polyethylene, which comprises
- (a) supporting a single-site catalyst selected from 8-quinolinoxytitanium trichloride or 8-quinolinoxytitanium tribenzyl onto a support;
- and
- (b) polymerizing ethylene at a temperature within the range of about 40° C. to about 110° C. in the presence of the supported catalyst of step (a) and a non-alumoxane activator, in the absence of aromatic solvent, α-olefin comonomer, and hydrogen, said polyethylene having a weight average molecular weight (Mw) greater than about 3,000,000 and molecular weight distribution (Mw/Mn) less than about 5.0.
Dependencies are inferred from the claim text.