Preparation of ultra high molecular weight linear low density polyethylene

• US 20080293562A1
• Filed: 07/29/2008
• Published: 11/27/2008
• Est. Priority Date: 09/28/2006
• Status: Active Grant

• Current Assignee: Shaotian Wang
• Original Assignee: Shaotian Wang
• Inventors: Wang, Shaotian
• Granted Patent: US 7,951,743 B2
• Time in Patent Office: Days
• US Class Current: 502/117
• CPC Class Codes: B01J 2231/122 Cationic (co)polymerisation, e.g. single-site or Ziegler-Natta type
• CPC Class Codes: B01J 2531/46 Titanium
• CPC Class Codes: B01J 2531/48 Zirconium
• CPC Class Codes: B01J 2531/49 Hafnium
• CPC Class Codes: B01J 31/128 Mixtures of organometallic compounds
• CPC Class Codes: B01J 31/143 of aluminium
• CPC Class Codes: B01J 31/146 of boron
• CPC Class Codes: B01J 31/2295 Cyclic compounds, e.g. cyclopentadienyls
• CPC Class Codes: C08F 10/02 Ethene
• CPC Class Codes: C08F 110/02 Ethene
• CPC Class Codes: C08F 210/08 Butenes
• CPC Class Codes: C08F 210/16 Copolymers of ethene with alpha-alkenes, e.g. EP rubbers
• CPC Class Codes: C08F 2420/05 Cp or analog where at least one of the carbon atoms of the coordinating ring is replaced by a heteroatom
• CPC Class Codes: C08F 2420/06 Cp analog where at least one of the carbon atoms of the non-coordinating part of the condensed ring is replaced by a heteroatom
• CPC Class Codes: C08F 2500/01 High molecular weight, e.g. >800,000 Da.
• CPC Class Codes: C08F 2500/03 Narrow molecular weight distribution, i.e. Mw/Mn < 3
• CPC Class Codes: C08F 2500/08 Low density, i.e. < 0.91 g/cm3
• CPC Class Codes: C08F 4/65904 in combination with another component of C08F4/64
• CPC Class Codes: C08F 4/65908 in combination with an ionising compound other than alumoxane, e.g. (C6F5)4B-X+
• CPC Class Codes: C08F 4/65912 in combination with an organoaluminium compound
• CPC Class Codes: C08F 4/65916 : supported on a carrier, e.g. silica, MgCl2, polymer
• CPC Class Codes: C08F 4/65925 : two cyclopentadienyl rings being mutually non-bridged
• CPC Class Codes: C08F 4/65927 : two cyclopentadienyl rings being mutually bridged

Abstract

Disclosed is a method of preparing an ultra-high molecular weight, linear low density polyethylene with a catalyst system that comprises a bridged indenoindolyl transition metal complex, a non-bridged indenoindolyl transition metal complex, an alumoxane activator and a boron-containing activator. The ultra-high molecular weight, linear low density polyethylene has a weight average molecular weight greater than 1,000,000 and a density less than 0.940 g/cm³.

Claims

1-11. -11. (canceled)

12. A catalyst system comprising a bridged indenoindolyl transition metal complex, a non-bridged indenoindolyl transition metal complex, an alumoxane activator and a boron-containing activator.

13. The catalyst system of claim 12, wherein the bridged complex has a general structure selected from I, II, III, or IV:

15. The catalyst system of claim 12, wherein the molar ratio of the bridged complex to the non-bridged complex is within the range of 1:

10 to 10;

1.

16. The catalyst system of claim 12, which is immobilized on a support selected from the group consisting of inorganic oxides, inorganic chlorides, organic polymer resins, and mixtures thereof.

14. The catalyst system of claim 21, wherein the bridged complex has a general structure selected from VII or VIII: