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:
Jan. 31, 2012
Filed:
May. 07, 2007
Jean-roch Schauder, Wavre, BE;
Kirk Alan Nass, San Francisco, CA (US);
Periagaram Srinivasan Ravishankar, Kingwood, TX (US);
Karine Vincent, Touffreville la Cable, FR;
Jean-Roch Schauder, Wavre, BE;
Kirk Alan Nass, San Francisco, CA (US);
Periagaram Srinivasan Ravishankar, Kingwood, TX (US);
Karine Vincent, Touffreville la Cable, FR;
ExxonMobil Chemical Patents Inc., Houston, TX (US);
Abstract
The invention relates to viscosity modifier polymers, concentrate and lubricant formulations utilizing a diblock polymer having one block A and one block B, block A contributing from 15 to 30% of the total chain length and block B from 70 to 85% of the total chain length, wherein block A comprises at least 93 wt % of ethylene and at least one other alpha-olefin and block B comprises an ethylene content between 40 and 75 wt % and at least one other alpha-olefin and wherein the resulting block copolymer has an average ethylene content of between about 60 wt % to 80 wt % ethylene, a fast Gaussian NMR relaxation signal between 17 and 22% and a slow exponential NMR relaxation signal between 58 and 68% of the total NMR relaxation signal, a SSI of at least 35% and a TE of at least 3.5 in order to obtain improvements in fuel economy.