ExxonMobil Chemical receives US patent for PE, 'process for production thereof'
May 14, 2013
(Targeted News Service)
– ExxonMobil Chemical Patents, Houston, has been assigned a patent (8,436,114) developed by Donna J. Crowther, Seabrook, Texas, and David M. Fiscus, Houston, for a "polyethylene and process for production thereof."
The abstract of the patent published by the U.S. Patent and Trademark Office states: "This invention relates to a process for polymerizing olefins in which the amount of trimethylaluminum in a methylalumoxane solution is adjusted to be from 1 to 25 mol %, prior to use as an activator, where the mol % trimethylaluminum is determined by .sup.1H NMR of the solution prior to combination with any support. This invention also relates to a process for polymerizing olefins in which the amount of an unknown species present in a methylalumoxane solution is adjusted to be from 0.10 to 0.65 integration units prior to use as an activator, where the amount of the unknown species is determined by the .sup.1H NMR spectra of the solution performed prior to combination with any support. Preferably, the methylalumoxane solution is present in a catalyst system also comprising a metallocene transition metal compound."
The patent application was filed on Oct. 18, 2011 (13/275,680). The full-text of the patent can be found at http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=84,36,114.PN.&OS=PN/84,36,114&RS=PN/84,36,114