Polyethylene Copolymers with Vinyl Terminated Macromonomers as Comonomers
AssigneeExxonMobil Chemical Patents Inc.
InventorPeijun Jiang
Life of this patent
Estimating the term…
Abstract
This invention relates to polyethylene copolymers comprising ethylene and vinyl terminated macromonomers. The polyethylene copolymers are achieved by copolymerization of ethylene and vinyl terminated macromonomers in a polymerization reactor, particularly in high yields and with a wide range of VTM molecular weights, that can be made at commercial rates.
Claims19
An ethylene copolymer comprising at least 70 wt % of ethylene and at least one vinyl terminated macromonomers (VTM) wherein the ethylene copolymer has:
- 1) a Mw of 100,000 g/mol or more;
- 2) a density of 0.94 g/cm3 or less;
- and 3) a ratio of the complex viscosity at a frequency of 0.1 rad/s to the complex viscosity at a frequency of 100 rad/s of 15 or more.
An ethylene copolymer comprising two portions:
- a first portion derived from a vinyl terminated macromonomer, VTM;
- and
- a second metallocene derived portion from one or more vinyl containing monomers, wherein the vinyl terminus of the first portion is incorporated into the metallocene derived polymeric portion;
- and
- wherein the ethylene copolymer comprises at least 70 weight percent ethylene and from about 0.5 to about 30 weight percent VTM.
A process for producing a copolymer of ethylene and vinyl terminated macromonomer (VTM), the process comprising:
- (i) polymerizing at least one first monomer in a first polymerization zone in the presence of at least one catalyst capable of producing a VTM with at least 50% of allylic terminated chain ends relative to all unsaturated chain ends;
- and
- (ii) contacting at least part of said the VTM with ethylene and, optionally, one or more alpha-olefins in a second polymerization zone separate from said first polymerization zone in the presence of at least one catalyst capable of incorporating the VTM into the copolymer.
Dependencies are inferred from the claim text.