摘要:
Disclosed is a bimodal Ziegler-Natta catalyzed polyethylene, having a density of from.930 g/cc to 0.960 g/cc, and a molecular weight distribution of from 10 to 25, wherein an article formed therefrom has a PENT of at least 1500. Also disclosed is a method of preparing a tubular article including obtaining a bimodal polyethylene having a density of from.930 g/cc to 0.960 g/cc and a molecular weight distribution of from 10 to 25, and processing the polyethylene under conditions where a specific energy input (SEI) is less than 300kW.h/ton, and wherein the article has a PENT of at least 1500. Further disclosed is a method for controlling the degradation of polyethylene including polymerizing ethylene monomer, recovering polyethylene, extruding the polyethylene, and controlling the degradation of polyethylene by measuring the SEI to the extruder and adjusting throughput and/or gear suction pressure keep SEI less than 300kW.h/ton, and forming an article.
摘要:
The process includes reacting a reaction mixture comprising magnesium ethoxide (Mg(OEt)2), triethylaluminum (TEAl), and 2-ethylhexanol (2-EHOH) to form magnesium 2-ethyl hexyl alkoxide (Mg(2-EHO)2) and contacting Mg(2-EHO)2 in hexane with a first agent to form a reaction product “A.” The process further includes contacting the reaction product “A” with a second agent to form a reaction product “B”, wherein the second agent includes a transition metal and a halogen. The process further includes contacting the reaction product “B” with a third agent to form a reaction product “C”, wherein the third agent includes a first metal halide. In addition, the process includes contacting the reaction product “C” with a fourth agent to form a reaction product “D”, wherein the fourth agent includes a second metal halide. The process also includes contacting the reaction product “D” with a fifth agent to form a Ziegler-Natta catalyst, wherein the fifth agent includes an organoaluminum compound.
摘要:
Polymer articles and processes of forming the same are described herein. The processes generally include providing a bimodal ethylene based polymer, blending the bimodal ethylene based polymer with a nucleator to form modified polyethylene and forming the modified polyethylene into a polymer article, wherein the polymer article is selected from pipe articles and blown films.
摘要:
A process of forming a Ziegler-Natta catalyst component is disclosed. The process includes contacting an alkyl magnesium compound with an alcohol and a first organoaluminum compound to form a magnesium dialkoxide compound and contacting the magnesium dialkoxide compound with a titanating agent to form reaction product “A.” The process further includes reacting reaction product “A” with a halogenating agent to form reaction product “B” and reacting reaction product “B” with a second organoaluminum compound to form a single halogenated catalyst component.
摘要:
Method employing a supported metallocene catalyst composition in the production of an isotactic ethylene propylene co-polymer. The composition comprises a metallocene component supported on a particulate silica support having average particle size of 10- 40microns, a pore volume of 1.3-1.6 ml/g, a surface area of 200-400 m 2 /g. An alkylalumoxane co catalyst component is incorporated on the support. The isospecific metallocene is characterized by the formula (1): B (CpRaRb)(FlR' 2 )MQ n or by the formula (2): B'(Cp'R'aR'b)(F1')M'Q' n' In the formulas Cp and Cp' are substituted cyclopentadienyl groups, F1 and F1' are fluorenyl groups, and B and B' are structural bridges. R' are substituents at the 2 and 7 positions, Ra and R'a are substituents distal to the bridge, and Rb and R'b are proximal to the bridge. M and M' are transition metals, Q' is a halogen or a C 1- C 4 alkyl group; and n' is an integer of from 0-4.
摘要:
Catalyst Systems, processes of forming the same and polymers and polymerization processes are described herein. The process of forming the catalyst system generally includes providing a first compound including a magnesium dialkoxide and aluminum alkoxide: contacting the first compound with a first agent and a second agent to form a solution of reaction product “A”, the first agent including a titanating agent and the second agent including a first metal halide; contacting the solution of reaction product “A” with a third agent to form a solid reaction product “B”, the third agent including a second metal halide: contacting the solid reaction product “B” with a fourth agent to form a solid reaction product “C”, the fourth agent including a third metal halide: optionally contacting the solid reaction product “C” with a fifth agent to form a solid reaction product “D”, the fifth agent including a fourth metal halide; and contacting the solid reaction product “C” or “D” with a sixth agent to form a catalyst component, the sixth agent including a first organoaluminum compound.
摘要:
Catalyst compositions, methods of forming the same and polymers formed therefrom are described herein. The methods of forming the catalysts generally include contacting an alkyl magnesium compound with a viscosity modifier prior to contact with an alcohol to form a magnesium dialkoxide compound; contacting the magnesium dialkoxide compound with a first titanium alkoxide and a first agent to form a first solution reaction product “A”, wherein the titanium alkoxide and the first agent are non-blended individual components prior to contacting the magnesium dialkoxide; contacting the first solution reaction product “A” with a second titanium alkoxide to form a second solution reaction product “B”; contacting the second solution reaction product “B” with a second agent to form a first solid reaction product “C”; contacting the first solid reaction product “C” with a third agent to form a second solid reaction product “D”; and contacting the second solid reaction product “D” with a reducing agent to limn a catalyst component.
摘要:
Method employing a supported metallocene catalyst composition in the production of an isotactic ethylene propylene co-polymer. The composition comprises a metallocene component supported on a particulate silica support having average particle size of 10- 40microns, a pore volume of 1.3-1.6 ml/g, a surface area of 200-400 m2/g. An alkylalumoxane cocatalyst component is incorporated on the support. The isospecific metallocene is characterized by the formula: B (CpRaRb)(FlIr2)MQn (1) or by the formula: B'(Cp'R'aR'b)(Fl')M'Q'n. (2) In the formulas Cp and Cp' are substituted cyclopentadienyl groups, Fl and Fl' are fluorenyl groups, and B and B' are structural bridges. R are substituents at the 2 and 7 positions, Ra and R'a are substituents distal to the bridge, and Rb and Rb are proximal to the bridge. M and M' are transition metals, Q' is a halogen or a Ci-C4 alkyl group; and n' is an integer of from 0- 4.