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US6838410B2 Expired / Lapsed US ⏱️ 0.0 years remaining

Catalysts for making polyolefins

Assignee: Equistar Chemicals LP
•
Filing: 2003-03-05
•
Granted: 2005-01-04
•
Expires: 2023-03-05
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Abstract

Abstract A process for making ethylene copolymers is disclosed. Ethylene copolymerizes with an α-olefin in the presence of a catalyst system comprising an activator and a silica-supported, bridged indenoindolyl metal complex having “open architecture.” The supported complex incorporates comonomers with exceptional efficiency, and the process gives ethylene copolymers having high molecular weights (Mw>100K) and very low densities (<0.910 g/cm 3 ). Open architecture catalysts that include bridging through the indolyl nitrogen of the indenoindolyl framework are also described. Additionally, supported and unsupported indeno[1,2-b]indolyl catalysts provide exceptional activities in the preparation of elastomeric polypropylene and ethylene copolymers.

Inventors

  • 👤 Shaotian Wang
  • 👤 Clifford C. Lee
  • 👤 Mark P. Mack
  • 👤 Gregory G. Hlatky
  • 👤 Sandor Nagy
  • 👤 Barbara M. Tsuie
  • 👤 Craig C. Meverden

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-31 22:46
CPC Classifications
C; C08; C08F; C08F210/00; C08F210/16; C08F4/00; C08F4/42; C08F4/44; C08F4/60; C08F4/62; C08F4/64; C08F4/659; C08F4/65908; C08F4/65912; C08F4/65916; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52; Y10; Y10S; Y10S526/00; Y10S526/943

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 21 words
A catalyst system which comprises: (a) an activator; and (b) a bridged indeno[1,2-b]indolyl Group 4-6 transition metal complex having open architecture.
Claim 2
Dependent Claim 21 words
A catalyst system which comprises: (a) an activator; and (b) a bridged indeno[1,2-b]indolyl Group 4-6 transition metal complex having open architecture.
Claim 3
Dependent Claim 24 words
The catalyst system of claim 1 wherein the activator is selected from the group consisting of alumoxanes, ionic borates, ionic aluminates, alkylaluminums, and aluminoboronates.
Claim 4
Dependent Claim 15 words
The catalyst system of claim 1 wherein the complex incorporates a Group 4 transition metal.
Claim 5
Dependent Claim 62 words
The catalyst system of claim 1 wherein the complex has the general structure: in which M is a Group 4-6 transition metal, G is a linking group, L is a ligand that is covalently bonded to G and M, R is alkyl, aryl, or trialkylsilyl, X is alkyl, aryl, alkoxy, aryloxy, halide, dialkylamino, or siloxy, and n satisfies the valence of M.
Claim 6
Dependent Claim 21 words
The catalyst system of claim 4 wherein M is a Group 4 transition metal, L is alkylamido, and G is dialkylsilyl.
Claim 7
Dependent Claim 24 words
The catalyst system of claim 4 wherein M is Ti or Zr, L is t-butylamido, G is dimethylsilyl, and X is halide or alkyl.
Claim 8
Dependent Claim 8 words
A silica-supported catalyst system of claim 1 .

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USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 2008-01-04 2008-07-05 2009-01-04 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 2012-01-04 2012-07-05 2013-01-04 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2016-01-04 2016-07-05 2017-01-04 $7700.00 Window Closed / Lapsed

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