Solid State Properties of Polyethylene Prepared with Tetrahydroindenyl-based Catalyst System
AssigneeTotal Research & Technology Feluy
InventorEric Maziers
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Abstract
Rotomoulded articles and methods of forming the same are described herein. The rotomoulded articles generally have a permeability of less than 1 g/day. The rotomoulded articles generally include polyethylene obtained by injecting into a reactor a catalyst system including a metallocene catalyst component of specific formula and an activating agent; injecting into the reactor ethylene monomer at a concentration of at least 6.5 wt %; injecting an amount of hydrogen such that a ratio of hydrogen to ethylene (H2/C2) in the feed is less than 85 g/106 g; maintaining the reactor under polymerisation conditions at a temperature of less than 90° C.; and retrieving polyethylene exhibiting a melt index (MI2) of at least 3.
Claims16
1-9. (canceled)
A rotomolded article comprising:
- a polyethylene, wherein the rotomoulded article exhibits a permeability of less than 0.5 g/day, wherein the permeability is determined by filling a 10 liter rotomoulded bottle having a wall thickness of 6 mm with fuel at a temperature of 40° C., wherein the fuel is a fuel as defined by CEC RF08-A-85 according to norm Standard ECE34—annex 5.
A rotomolded article comprising:
- a polyethylene having a spherulite size of less than 20 μm prepared under polymerisation conditions at a temperature of less than 90° C. in the presence of a catalyst system comprising an activating agent and a metallocene catalyst component of general formula:
- R″(Ind)2MQ2
- wherein (Ind) is an indenyl or an hydrogenated indenyl, substituted or unsubstituted;
- R″ is a structural bridge between the two indenyls that comprises a C1-C4 alkylene radical, dialkyl germanium, silicon, siloxane, phosphine or amine radical;
- which bridge is substituted or unsubstituted;
- Q is a hydrocarbyl radical having from 1 to 20 carbon atoms or a halogen;
- and M is a transition metal Group 4 of the Periodic Table or Vanadium;
- wherein the rotomoulded article exhibits a permeability of less than 0.5 g/day, wherein the permeability is determined by filling a 10 liter rotomoulded bottle having a wall thickness of 6 mm with fuel at a temperature of 40° C., wherein the fuel is a fuel as defined by CEC RF08-A-85 according to norm Standard ECE34—annex 5.
A rotomolded article comprising:
- a polyethylene having a spherulite size of less than 20 μm prepared under polymerisation conditions at a temperature of less than 90° C. in the presence of a catalyst system comprising an activating agent and a metallocene catalyst component of general formula:
- R″(Ind)2MQ2
- wherein (Ind) is an indenyl or an hydrogenated indenyl, substituted or unsubstituted;
- R″ is a structural bridge between the two indenyls that comprises a C1-C4 alkylene radical, dialkyl germanium, silicon, siloxane, phosphine or amine radical;
- which bridge is substituted or unsubstituted;
- Q is a hydrocarbyl radical having from 1 to 20 carbon atoms or a halogen;
- and M is a transition metal Group 4 of the Periodic Table or Vanadium;
- wherein the polymerisation conditions include ethylene monomer at a concentration of at least 6.5 weight percent, and no hydrogen;
- and
- wherein the rotomoulded article exhibits a permeability of less than 0.5 g/day, wherein the permeability is determined by filling a 10 liter rotomoulded bottle having a wall thickness of 6 mm with fuel at a temperature of 40° C., wherein the fuel is a fuel as defined by CEC RF08-A-85 according to norm Standard ECE34—annex 5.
Dependencies are inferred from the claim text.