Catalyst compositions for selective dimerization and polymerization of ethylene

Patent metadata

Field	Value
Publication number	US-2018133703-A1
Application number	US-201415103023-A
Country	US
Kind code	A1
Filing date	Dec 12, 2014
Priority date	Dec 13, 2013
Publication date	May 17, 2018
Grant date	—

Abstract

A catalyst composition comprises an inert hydrocarbon solvent, having dissolved therein a titanate of the formula Ti(OR) 4 wherein each R is the same or different, and is a hydrocarbon residue, and an organic aluminum compound, wherein a molar ratio of the organic aluminum compound and any alkene present in the catalyst composition is greater than one.

First claim

1 . A catalyst composition, comprising:
a titanate of the formula Ti(OR) 4 wherein each R is the same or different, and is a hydrocarbon residue; an ether catalyst modifier, and an aluminoxane wherein the aluminoxane is a methyl aluminoxane, a modified methyl aluminoxane, or a combination comprising at least one of the foregoing.

2 . The catalyst composition of claim 1 , wherein the titanate is Ti(O-butyl) 4 , Ti(O-n-alkyl) 4 , Ti(O-n-butyl) 4 or a combination comprising at least one of the foregoing.

3 . The catalyst composition of claim 1 , wherein the modified methyl aluminoxane is a copolymer comprising MeAlO repeating units and R 3 AlO repeating units wherein R 3 is a C 2 - 12 hydrocarbon.

4 . The catalyst composition of claim 1 , comprising a further organic aluminium compound distinct from the methyl aluminoxane and from the modified methyl aluminoxane.

5 . The catalyst composition of claim 4 , wherein the organic aluminium compound is of the formula Al n R 3n , wherein n is 1 or 2 and each R is the same or different, and is hydrogen, a hydrocarbon residue, or halogen.

6 . A process for the preparation of a polymer, the process comprising
contacting an alkene with the catalyst composition according to claim 1 under conditions effective to form a polymer.

7 . The process according to claim 6 , wherein the alkene is ethene and the polymer is polyethylene.

8 . The process according to claim 6 , wherein the contacting is in a homogeneous liquid phase.

9 . The process according to claim 6 , wherein the conditions include at least one of a pressure of about 5 to about 50 bar, or a temperature of about 40 to about 80° C.

10 . The process according to claim 6 , further comprising shaping the polymer to provide an article.

11 . The catalyst composition of claim 1 , wherein the ether catalyst modifier comprises tetrahydrofuran.

12 . The catalyst composition of claim 3 , wherein a ratio of the number of MeAlO repeating units and the number of R 3 AlO repeating units is about 20:1 to about 1:1.

13 . The catalyst composition of claim 4 , wherein a molar the ratio between the aluminoxane and the organic aluminium compound is about 1:5 to about 5:1.

14 . The catalyst composition of claim 5 , wherein the organic aluminium

Assignees

• Saudi Basic Ind Corp

Inventors

• Schmidt Roland
• Al-Hazmi Mohammed H
• Al-Anazi Mohammed F
• Pradhan Devranjan J

Classifications

• C08F2/04

  Polymerisation in solution (C08F2/32 takes precedence) · CPC title

• B01J31/0231

  Halogen-containing compounds · CPC title

• C08F10/02 Primary

  Ethene · CPC title

• C08F110/02

  Ethene · CPC title

• B01J31/0212 Primary

  Alkoxylates · CPC title