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:
Aug. 12, 2008
Filed:
Jul. 28, 2004
Stefan Bertil Ohlsson, Wespelaar, BE;
Bart Lauwers, Schriek, BE;
Jan C. Donck, Holsbeek, BE;
Jef Vaes, Zonhoven, BE;
Stefan Bertil Ohlsson, Wespelaar, BE;
Bart Lauwers, Schriek, BE;
Jan C. Donck, Holsbeek, BE;
Jef Vaes, Zonhoven, BE;
ExxonMobil Chemical Patents Inc., Houston, TX (US);
Abstract
Polymers comprising units derived from ethylene, said polymer having: a) a Melt Index of from 0.05 to 20 g/10 min. as determined by ASTM-1238 Condition E; b) at least 10 per 1000 C-atoms of short chain branches, containing five carbon atoms or less, as determined by C13 NMR, and less than 3.5 mol %, of units derived from a copolymerizable ethylenically unsaturated ester; c) a density of from 0.90 to 0.94 g/cm, preferably 0.91 to 0.935 g/cm, especially 0.92 to 0.93 g/cmas determined by ASTM D1505; and d) a relaxation time as described herein of at least 10 s. Such polymers can be obtained by free radical polymerization using a chain transfer agent that incorporates into the polymer chain such as an alpha-olefin, preferably propylene, as a chain transfer agent, preferably in a tubular reactor under circumstances to favor LCB formation in a down stream part of the tubular reactor.