Processes to improve reactor stability for the preparation of ethylene-based polymers using asymmetrical polyenes

US9751964B2 · kind B2 · utility

Assignee

• DOW GLOBAL TECHNOLOGIES LLC · US

Inventors

• Christopher R. Eddy · Lake Jackson, US
• John O. Osby · Lake Jackson, US
• Sean W. Ewart · Lake Jackson, US
• Sarat Munjal · Freeport, US
• Stefan Hinrichs · Wondelgem, BE
• Otto J. Berbee · Hulst, NL

Key dates

• Filing date: Dec 23, 2014
• Grant date: Sep 5, 2017
• Expiry date: Dec 23, 2034

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F210/02
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention provides a process to form an ethylene-based polymer, said process comprising polymerizing ethylene and at least one asymmetrical polyene, comprising an “alpha, beta unsaturated—carbonyl end” and a “C—C double bond end,” and wherein the polymerization takes place in the presence of at least one free-radical initiator, and wherein the polymerization takes place in a reactor configuration comprising at least two reaction zones, reaction zone I and reaction zone i (i>2), wherein reaction zone I is downstream from reaction zone I; and wherein at least one chain transfer agent (CTA) is added to the polymerization, and wherein the CTA is a saturated hydrocarbon or an unsaturated hydrocarbon.