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:
Dec. 01, 2015
Filed:
Sep. 06, 2012
Rainer Kolb, Kingwood, TX (US);
Sudhin Datta, Houston, TX (US);
Pritesh A. Patel, Novato, CA (US);
Kirk A. Nass, San Francisco, CA (US);
Rainer Kolb, Kingwood, TX (US);
Sudhin Datta, Houston, TX (US);
Pritesh A. Patel, Novato, CA (US);
Kirk A. Nass, San Francisco, CA (US);
ExxonMobil Chemical Patents Inc., Houston, TX (US);
Chevron Oronite Company LLC, Richmond, CA (US);
Abstract
A method is provided to determine the predisposition of a polymer to form network or gel in a lubricating oil which comprises obtaining a composition of a polymer in a diluent, measuring the shear stress as a function of shear rate, determining the yield stress using the Herschel-Bulkley equation and assessing the yield stress. A method is also provided to determine the predisposition of a polymer to form network or gel in a lubricating oil which comprises obtaining a composition of a polymer in a diluent, determining at least one of (i) the storage modulus G' and loss modulus G″ of the composition by subjecting the composition to sinusoidal (oscillating) stress or strain of certain amplitude and frequency, (ii) the phase lag (angle) of the response strain or stress δ, or (iii) the tangent (tan) δ, and (c) assessing at least one of the G′, G″, δ, or tan(δ) determined.