The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 20, 2014
Filed:
Dec. 14, 2010
Otto J. Berbee, Hulst, NL;
Cornelis Den Doelder, Terneuzen, NL;
Egbert Nijhof, Westdorpe, NL;
Mehmet Demirors, Pearland, TX (US);
Sjoerd A. DE Vries, Terneuzen, NL;
Otto J. Berbee, Hulst, NL;
Cornelis Den Doelder, Terneuzen, NL;
Egbert Nijhof, Westdorpe, NL;
Mehmet Demirors, Pearland, TX (US);
Sjoerd A. De Vries, Terneuzen, NL;
Dow Global Technologies LLC, Midland, MI (US);
Abstract
A high pressure polymerization process to form an ethylene-based polymer comprises the steps of: A. Injecting a first feed comprising ethylene and optionally a chain transfer agent system (CTA system) into a first autoclave reactor zone operating at polymerization conditions to produce a first zone reaction product, the CTA system of the first reactor zone having a transfer activity Z1; and B. (1) Transferring at least part of the first zone reaction product to a second reactor zone selected from a second autoclave reactor zone or a tubular reactor zone and operating at polymerization conditions, and, optionally, (2) freshly injecting a second feed into the second reactor zone to produce a second zone reaction product, with the proviso that the second reactor zone contains a CTA system having a transfer activity Z2; and with the proviso that the ratio of Z1/Z2 is less than 1.