Metathesis catalyst system for polymerizing cycloolefins

Patent metadata

Field	Value
Publication number	US-11724250-B2
Application number	US-201916575800-A
Country	US
Kind code	B2
Filing date	Sep 19, 2019
Priority date	Sep 20, 2018
Publication date	Aug 15, 2023
Grant date	Aug 15, 2023

Abstract

A supported catalyst system is based on a transition metal carbene including the moiety M1=CR*) 2 , wherein M 1 is the transition metal and R* is hydrogen or a C 1 -C 8 hydrocarbyl. The catalyst system can be supported on a metal oxide support such as silica or the catalyst can be self-supporting. Methods of making the catalyst system can involve precursors based on and/or reacted with aluminum alkyls, halides, and/or alkoxides. Methods of polymerizing cyclic olefins with the catalyst system can obtain polyalkenamers, cyclic olefin polymers, cyclic olefin copolymers, and other metathesis reaction products. The supported catalyst and/or monomer can be recovered and recycled to the polymerization reactor.

First claim

We claim:

1. A supported Ziegler Natta (ZN) catalyst composition comprising a transition metal carbene comprising moieties having the general formulae (F6):

where M 1 is a Group 5 or a Group 6 metal of the periodic table of valence v;
each R* is independently hydrogen or a C 1 to C 8 alkyl radical;
each Y is OR 5 , wherein each R 5 is para-methylphenyl group; and
M 2 O x is a metal oxide support selected from silica, alumina, titania, or a combination thereof.

2. The supported Ziegler Natta catalyst according to claim 1 , comprising moieties having the general formula (F6), wherein M 2 O x comprises silica, wherein the silica has been heat treated at a temperature greater than or equal to 600° C. to form isolated hydroxyl groups on a surface such that the silica support further comprises moieties having the general formula:

wherein x is greater than 1.

Assignees

• Exxonmobil Chemical Patents Inc

Inventors

• Luo Lubin
• Blok Edward J
• Galuska Alan A
• Jain Anupriya
• Zabula Alexander V
• Lin Yen-Hao

Classifications

• Y02P20/52

  using catalysts, e.g. selective catalysts · CPC title

• B01J31/2213 Primary

  At least two complexing oxygen atoms present in an at least bidentate or bridging ligand · CPC title

• C08G61/08 Primary

  of carbocyclic compounds containing one or more carbon-to-carbon double bonds in the ring · CPC title

• B01J2231/14

  Other (co) polymerisation, e.g. of lactides or epoxides · CPC title

• B01J2231/543

  alkene metathesis · CPC title