Ethylene-based polymers with low hexane extractables and low densities

US10730973B2 · kind B2 · utility

Assignee

• DOW GLOBAL TECHNOLOGIES LLC · US

Inventors

• Otto J. Berbee · Hulst, NL
• Cornelis F. J. Den Doelder · Terneuzen, NL
• Stefan Hinrichs · Wondelgem, BE
• Teresa P. Karjala · Lake Jackson, US
• John O. Osby · Lake Jackson, US

Key dates

• Filing date: Jun 16, 2016
• Grant date: Aug 4, 2020
• Expiry date: Jul 7, 2036

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F110/02
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Ethylene-based polymers comprising the following properties: (A) a density less than 0.9190 g/cc; (B) a hexane extractable level that meets the following equation: hexane extractable level ≤A+B [log(12)], where A=2.65 wt %, and B—0.25 wt %[log (dg/min)]; based on total weight of the ethylene-based polymer; (C) a G′ (at G″=500 Pa, 1 70° C.) that meets the following equation: G′≥C+D [log(12)], where C=150 Pa, and D=−60 Pa/[log(dg/min)]; and (D) a melt index (12) from 0.7 to 20 dg/min; are made in high pressure tubular process that comprises at least three reaction zones with the peak polymerization temperature of the first reaction zone ≥320° C. and the peak polymerization temperature of the last reaction zone ≤290° C.