Process to form ethylene/alpha-olefin interpolymers

US10167383B2 · kind B2 · utility

Assignee

• DOW GLOBAL TECHNOLOGIES LLC · US

Inventors

• Thomas W. Karjala · Lake Jackson, US
• Jorge Rubalcaba · Pearland, US
• Edward O. Madenjian · Lake Jackson, US
• Curvel Hypolite · Rosharon, US
• Pradeep Jain · Lake Jackson, US

Key dates

• Filing date: Dec 18, 2015
• Grant date: Jan 1, 2019
• Expiry date: Dec 18, 2035

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L2308/00
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

The invention provides a process to form a “first composition comprising a first ethylene/α-olefin interpolymer and a second ethylene/α-olefin interpolymer,” said process comprising polymerizing a first mixture comprising ethylene, an α-olefin, and optionally a polyene, in a stirred tank reactor to form a first ethylene/α-olefin interpolymer, and transferring at least some of the first ethylene/α-olefin interpolymer to a loop reactor, and polymerizing, therein, a second mixture comprising ethylene, an alpha-olefin, and optionally a polyene, in the presence of the first ethylene/α-olefin interpolymer, to form the “first composition comprising the first ethylene/α-olefin interpolymer and the second ethylene/α-olefin interpolymer.” The invention also provides a polymerization reactor configuration comprising at least the following: a stirred tank reactor followed by a loop reactor.