Process to form ethylene/α-olefin interpolymers

US10336846B2 · kind B2 · utility

Assignee

• DOW GLOBAL TECHNOLOGIES LLC · US

Inventors

• Sean W. Ewart · Lake Jackson, US
• Susan G. Brown · Freeport, US
• Daniela Ferrari · Rosharon, US
• Edward O. Madenjian · Lake Jackson, US
• Gregory J. Brennan · Angleton, US

Key dates

• Filing date: May 9, 2016
• Grant date: Jul 2, 2019
• Expiry date: Jun 2, 2036

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F2400/02
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention provides a process to form an ethylene/a-olefin interpolymer, comprising at least the following steps A) through C): A) polymerizing, in at least one reactor, at least one reaction mixture comprising ethylene and the a-olefin, in a solution polymerization, and in the presence of at least the following components I), II) and III): I) at least one compound of Structure 1, as described herein; II) at least one co-catalyst, as described herein; III) at least one compound of Structure 2, as described herein; B) separating the final polymer solution into at least a polymer-rich solution and a polymer-free solution; and optionally, at least a portion of the polymer-free solution is recycled back to the reactor; C) maintaining the level of the at least one compound of Structure 2 in the at least one reactor, from 100 ppm to 10,000 ppm, as described herein.