Catalyst composition comprising shuttling agent for ethylene multi-block copolymer formation

Patent metadata

Field	Value
Publication number	US-9243090-B2
Application number	US-201414278472-A
Country	US
Kind code	B2
Filing date	May 15, 2014
Priority date	Mar 17, 2004
Publication date	Jan 26, 2016
Grant date	Jan 26, 2016

Abstract

A composition for use in forming a multi-block copolymer, said copolymer containing therein two or more segments or blocks differing in chemical or physical properties, a polymerization process using the same, and the resulting polymers, wherein the composition comprises the admixture or reaction product resulting from combining:
(A) a first metal complex olefin polymerization catalyst, (B) a second metal complex olefin polymerization catalyst capable of preparing polymers differing in chemical or physical properties from the polymer prepared by catalyst (A) under equivalent polymerization conditions, and (C) a chain shuttling agent.

First claim

The invention claimed is:

1. An olefin interpolymer that is an ethylene/a-olefin multi-block copolymer comprising greater than 50 mol % units derived from ethylene and having a Mw/Mn from 2.6 to 5.0;
a delta quantity (tallest DSC peak minus tallest CRYSTAF peak) greater than the quantity, y*, defined by the equation:
y*>− 0.1299(Δ H )+62.81,

and a heat of fusion up to 130 J/g,
wherein the CRYSTAF peak is determined using at least 5 percent of the cumulative polymer, and if less than 5 percent of the polymer has an identifiable CRYSTAF peak, then the CRYSTAF temperature is 30° C., and ΔH is the numerical value of the heat of fusion in J/g,
wherein the ethylene/α-olefin multi-block copolymer comprises at least three metal species and one metal species is hafnium and another metal species is zinc, and the ethylene/α-olefin multi-block copolymer has one and only one melting point.

2. The olefin interpolymer of claim 1 wherein the ethylene/a-olefin multi-block copolymer comprises a comonomer selected from the group consisting of butene, hexene, and octene.

3. The olefin interpolymer of claim 1 wherein the ethylene/a-olefin multi-block copolymer has a glass transition temperature, Tg, less than −25° C.

4. The olefin interpolymer of claim 1 wherein one of the metal species is zirconium.

Assignees

• Dow Global Technologies Llc

Inventors

• Arriola Daniel J
• Carnahan Edmund M
• Cheung Yunwa Wilson
• Devore David D
• Graf David D
• Hustad Phillip D
• Kuhlman Roger L
• Shan Colin Li Pi
• Poon Benjamin C
• Roof Gordon R
• Stevens James C
• Stirn Pamela J
• Wenzel Timothy T

Classifications

• C08F4/65908

  in combination with an ionising compound other than alumoxane, e.g. (C6F5)4B-X+ · CPC title

• C08F2500/03

  Narrow molecular weight distribution, i.e. Mw/Mn < 3 · CPC title

• C08F4/65904

  in combination with another component of C08F4/64 · CPC title

• C08F4/65925

  two cyclopentadienyl rings being mutually non-bridged · CPC title

• C08F2500/09

  Long chain branches · CPC title