Multiple catalyst system and polymerization process for use thereof

Patent metadata

Field	Value
Publication number	US-9422382-B2
Application number	US-201514794531-A
Country	US
Kind code	B2
Filing date	Jul 8, 2015
Priority date	Jun 13, 2014
Publication date	Aug 23, 2016
Grant date	Aug 23, 2016

Abstract

This invention relates to a catalyst system comprising a half sandwich chromocene compound featuring a tethered N-donor, with an alumoxane and consequent supportation on silica produces a catalyst that produces ultra-high molecular weight polyethylene and that further supportation of a catalyst capable of producing linear low density polyethylene produces a multiple-catalyst system on the same support, capable of producing polyethylene with a bimodal molecular weight distribution and excellent molecular weight.

First claim

The invention claimed is:

1. A catalyst system comprising activator, support, catalyst compound represented by Formula I and catalyst compound represented by Formula II where:
Formula I is

where
T is a bridging group; N is nitrogen; M* is Cr, Mo, or W, where M* is in a +3 oxidation state prior to contacting with activator; each X, is independently, selected from the group consisting of hydrocarbyl radicals having from 1 to 20 carbon atoms, hydrides, amides, alkoxides, sulfides, phosphides, halides, dienes, amines, phosphines, ethers, and a combination thereof, two X's optionally form a part of a fused ring or a ring system; each R 1 , R 2 , R 3 , and R 4 is independently, hydrogen, a C 1 to C 12 hydrocarbyl, a substituted C 1 to C 12 hydrocarbyl, a heteroatom, or substituted heteroatom group; and each R 5 and R 6 is, independently, a C 1 to C 12 hydrocarbyl, a substituted C 1 to C 12 hydrocarbyl, a heteroatom, or substituted heteroatom group, where the R 5 and R 6 groups optionally form a fused ring or multicenter fused ring system where the rings are aromatic, partially saturated or saturated; and
Formula II is:

where
M is Hf or Zr; z is 0 or 1; R 1 , R 2 , R 3 , R 4 , T and X, are as described above; and
each R 8 , R 9 , R 10 , and R 11 is, independently, hydrogen, a C 1 to C 12 hydrocarbyl, a substituted C 1 to C 12 hydrocarbyl, a heteroatom, or substituted heteroatom group.

2. The catalyst system of claim 1 , wherein M* is Cr and M is Zr.

3. The catalyst system of claim 1 , wherein the molar ratio of M* to M is 1:1000 to 1000:1.

4. The catalyst system of claim 1 , wherein the N(R 5 )(R 6 ) fragment is a neutral donor ligand.

5. The catalyst system of claim 1 , wherein the N(R 5 )(R 6 ) fragment is selected from the group consisting of pyrrolidine, aziridine, azetidine, piperidine, azepane, azocane, azonane, azecane, 1H-azirine, 1,2-dihydroazete, 2-pyrroline, 3-pyrroline, 1,4-dihydropyridine, azepine, azonine, indole, isoindole, indoline, isoindoline or a substituted analog thereof.

6. The catalyst system of claim 1 , wherein each R 5 and R 6 , is, independently, methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl, docecyl, or an isomer thereof, or Cl, Br, F, I or Si; and each R 1 , R 2 , R 3 , R 4 , R 8 , R 9 , R 10 , and R 11 is, independently, selected from the group consisting of hydrogen, methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl, docecyl, or an isomer thereof, Cl, F, I, Br, and Si.

7. The catalyst system of claim 1 , wherein each X is independently selected from chloride, bromide, methyl, ethyl, propyl, butyl, and pentyl.

8. The catalyst system of claim 1 , wherein T is represented by the formula, (R* 2 G) g , where each G is C, Si, or Ge, g is 1 or 2, and each R* is, independently, hydrogen, halogen, C 1 to C 20 hydrocarbyl or a C 1 to C 20 substituted hydrocarbyl, and two or more R* can form a cyclic structure including aromatic, partially saturated, or saturated cyclic or fused ring system.

9. The catalyst system of claim 1 , wherein the compound represented by Formula I comprises one or more of: ethylene (cyclopentadienyl)(pyrrolidine)chromium dichloride; dimethylsilyl (cyclopentadienyl)(pyrrolidine)chromium dichloride; phenylene (cyclopentadienyl)(pyrrolidine)chromium dichloride; and diphenylsilyl (cyclopentadienyl)(pyrrolidine)chromium dichloride; and the compound represented by Formula II comprises bis(1-methyl, 3-n-butyl cyclopentadienyl)zirconium dichloride.

10. The catalyst system of claim 1 , wherein the support is silica.

11. A process to polymerize olefins comprising contacting one or more olefins with the catalyst system of claim 1 .

12. The process of claim 11 , wherein the activator comprises alumoxane.

13. The process of claim 11 , wherein alumoxane is present at a molar ratio of aluminum to catalyst compound transition metal of 100:1 or more.

14. The process of claim 11 , wherein the activator comprises a non-coordinating anion activator.

15. The process of claim 11 , wherein activator is represented by the formula:
(Z) d + (A d− )

wherein Z is (L-H) or a reducible Lewis Acid, L is an neutral Lewis base; H is hydrogen; (L-H) + is a Bronsted acid; A d− is a non-coordinating anion having the charge d−; and d is an integer from 1 to 3.

16. The process of claim 11 , wherein activator is represented by the formula:
(Z) d + (A d− )

wherein A d− is a non-coordinating anion having the charge d−; d is an integer from 1 to 3, and Z is a reducible Lewis acid represented by the formula: (Ar 3 C + ), where Ar is aryl or aryl substituted with a heteroatom, a C 1 to C 40 hydrocarbyl, or a substituted C 1 to C 40 hydrocarbyl.

17. The process of claim 11 , wherein the activator is one or more of:
N,N-dimethylanilinium tetrakis(pentafluorophenyl)borate,
triphenylcarbenium tetrakis(pentafluorophenyl)borate,
trimethylammonium tetrakis(perfluoronaphthyl)borate,
triethylammonium tetrakis(perfluoronaphthyl)borate,
tripropylammonium tetrakis(perfluoronaphthyl)borate,
tri(n-butyl)ammonium tetrakis(perfluoronaphthyl)borate,
tri(t-butyl)ammonium tetrakis(perfluoronaphthyl)borate,
N,N-dimethylanilinium tetrakis(perfluoronaphthyl)borate,
N,N-diethylanilinium tetrakis(perfluoronaphthyl)borate,
N,N-dimethyl-(2,4,6-trimethylanilinium) tetrakis(perfluoronaphthyl)borate,
tropillium tetrakis(perfluoronaphthyl)borate,
triphenylcarbenium tetrakis(perfluoronaphthyl)borate,
triphenylphosphonium tetrakis(perfluoronaphthyl)borate,
triethylsilylium tetrakis(perfluoronaphthyl)borate,
benzene(diazonium) tetrakis(perfluoronaphthyl)borate,
trimethylammonium tetrakis(perfluorobiphenyl)borate,
triethylammonium tetrakis(perfluorobiphenyl)borate,
tripropylammonium tetrakis(perfluorobiphenyl)borate,
tri(n-butyl)ammonium tetrakis(perfluorobiphenyl)borate,
tri(t-butyl)ammonium tetrakis(perfluorobiphenyl)borate,
N,N-dimethylanilinium tetrakis(perfluorobiphenyl)borate,
N,N-diethylanilinium tetrakis(perfluorobiphenyl)borate,
N,N-dimethyl-(2,4,6-trimethylanilinium) tetrakis(perfluorobiphenyl)borate,
tropillium tetrakis(perfluorobiphenyl)borate,
triphenylcarbenium tetrakis(perfluorobiphenyl)borate,
triphenylphosphonium tetrakis(perfluorobiphenyl)borate,
triethylsilylium tetrakis(perfluorobiphenyl)borate,
benzene(diazonium) tetrakis(perfluorobiphenyl)borate,
[4-t-butyl-PhNMe 2 H][(C 6 F 3 (C 6 F 5 ) 2 ) 4 B],
trimethylammonium tetraphenylborate,
triethylammonium tetraphenylborate,
tripropylammonium tetraphenylborate,
tri(n-butyl)ammonium tetraphenylborate,
tri(t-butyl)ammonium tetraphenylborate,
N,N-dimethylanilinium tetraphenylborate,
N,N-diethylanilinium tetraphenylborate,
N,N-dimethyl-(2,4,6-trimethylanilinium) tetraphenylborate,
tropillium tetraphenylborate,
triphenylcarbenium tetraphenylborate,
triphenylphosphonium tetraphenylborate,
triethylsilylium tetraphenylborate,
benzene(diazonium)tetraphenylborate,
trimethylammonium tetrakis(pentafluorophenyl)borate,
triethylammonium tetrakis(pentafluorophenyl)borate,
tripropylammonium tetrakis(pentafluorophenyl)borate,
tri(n-butyl)ammonium tetrakis(pentafluorophenyl)borate,
tri(sec-butyl)ammonium tetrakis(pentafluorophenyl)borate,
N,N-dimethylanilinium tetrakis(pentafluorophenyl)borate,
N,N-diethylanilinium tetrakis(pentafl

Assignees

• Exxonmobil Chemical Patents Inc

Inventors

• Alliger Glen E
• Walzer Jr John W

Classifications

• C08F4/69

  Chromium, molybdenum, tungsten or compounds thereof · CPC title

• C08F4/65912

  in combination with an organoaluminium compound · CPC title

• C08F4/6028

  with an alumoxane, i.e. a compound containing an -Al-O-Al-group · CPC title

• C08F210/16 Primary

  Copolymers of ethene with alpha-alkenes, e.g. EP rubbers · CPC title

• C08F4/6925

  NSN · CPC title