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US4918038A Expired / Lapsed US ⏱️ 0.0 years remaining

Process for the production of polyethylene with a broad and/or bimodal molecular weight distribution

Assignee: Union Carbide Chemicals and Plastics Technology LLC
•
Filing: 1987-10-29
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Granted: 1990-04-17
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Expires: 2007-10-29
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Abstract

Abstract A process for the production of an ethylene homopolymer or copolymer comprising passing ethylene with or without at least one alpha-olefin comonomer having 3 or more carbon atoms into contact with a mixed catalyst system, under polymerization conditions, said mixed catalyst system comprising: (a) the reaction product of (i) a vanadium halide having the formula VX 3 wherein X is chlorine, bromine, or iodine and each X is alike or different; (ii) a modifier having the formula BX 3 or AlR.sub.(3-a) X a and (iii) an electron donor (b) one of the following: (i) a complex having the formula ZrMg b X c (ED) d ; or (ii) a vanadium oxy compound having the formula VOX 3 , VOX 2 , VOX, or VO 2 X wherein X is as defined above, or VO(OR) 3 (c) a hydrocarbyl aluminum cocatalyst; and (d) a halocarbon promoter having the formula R e CX.sub.(4-e) wherein R is hydrogen or an unsubstituted or halo substituted alkyl radical having 1 to 6 carbon atoms; each R is alike or different; X is chlorine, bromine, iodine, or fluorine; each X is alike or different and e is 0, 1, or 2 provided that, if no fluorine is present, e is 2.

Inventors

  • 👤 Sari-Beth Samuels
  • 👤 Frederick J. Karol

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-02 10:53
CPC Classifications
C; C08; C08F; C08F10/00; C08F10/02

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 236 words
A mixed catalyst system comprising (a) the reaction product of (i) a vanadium halide having the formula VX 3 wherein X is chlorine, bromine, or iodine and each X is alike or different; (ii) a modifier having the formula BX 3 or AlR.sub.(3-a) X a wherein X is as defined above; R is an alkyl radical having 1 to 14 carbon atoms; each R is alike or different; and a is 0, 1, or 2; and (iii) an electron donor, which is a liquid Lewis base in which the vanadium halide and modifier are soluble, said reaction product being supported; (b) a complex having the formula ZrMg b X c (ED) d wherein X is as defined above; ED is an electron donor, which is a liquid Lewis base in which the precursors of the complex are soluble; b is a number from 1 to 3; c is a positive nubmer equal to or less than 4+2b; and d is a number from 4 to 10; (c) a hydrocarbyl aluminum cocatalyst; and (d) a halocarbon promoter having the formula R e CX.sub.(4-e) wherein R is hydrogen or an unsubstituted or halo substituted alkyl radical having 1 to 6 carbon atoms; each R is alike or different; X is chlorine, bromine, iodine, or fluorine; each X is alike or different; and e is 0, 1, or 2 provided that, if no fluorine is present, e is 2.
Claim 2
Dependent Claim 236 words
A mixed catalyst system comprising (a) the reaction product of (i) a vanadium halide having the formula VX 3 wherein X is chlorine, bromine, or iodine and each X is alike or different; (ii) a modifier having the formula BX 3 or AlR.sub.(3-a) X a wherein X is as defined above; R is an alkyl radical having 1 to 14 carbon atoms; each R is alike or different; and a is 0, 1, or 2; and (iii) an electron donor, which is a liquid Lewis base in which the vanadium halide and modifier are soluble, said reaction product being supported; (b) a complex having the formula ZrMg b X c (ED) d wherein X is as defined above; ED is an electron donor, which is a liquid Lewis base in which the precursors of the complex are soluble; b is a number from 1 to 3; c is a positive nubmer equal to or less than 4+2b; and d is a number from 4 to 10; (c) a hydrocarbyl aluminum cocatalyst; and (d) a halocarbon promoter having the formula R e CX.sub.(4-e) wherein R is hydrogen or an unsubstituted or halo substituted alkyl radical having 1 to 6 carbon atoms; each R is alike or different; X is chlorine, bromine, iodine, or fluorine; each X is alike or different; and e is 0, 1, or 2 provided that, if no fluorine is present, e is 2.
Claim 3
Dependent Claim 43 words
The mixed catalyst system defined in claim 1 wherein the electron donors are alkyl esters of aliphatic and aromatic carboxylic acids, aliphatic ketones, aliphatic amines, aliphatic alcohols, alkyl and cycloalkyl ethers, or mixtures thereof, each electron donor having 2 to 20 carbon atoms.
Claim 4
Dependent Claim 30 words
The mixed catalyst system defined in claim 1 wherein component (a) is the reaction product of vanadium trichloride, diethylaluminum chloride, and tetrahydrofuran, said reaction product impregnated on a silica support.
Claim 5
Dependent Claim 21 words
The mixed catalyst system defined in claim 1 wherein component (b) is the complex ZrMg 2 Cl 8 .(tetrahydrofuran) 6 .

References Cited (Backward Citations)

US4124532A Cited
US4397761A Cited
US4508842A Cited
US4607019A Cited
FR2574801A1 Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1993-04-16 1993-10-16 1994-04-17 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1997-04-16 1997-10-16 1998-04-17 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2001-04-16 2001-10-16 2002-04-17 $7700.00 Window Closed / Lapsed

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