Exxonmobil Chemical Patents Inc.

Chevron Oronite Company LLC

Kirk Nass

Sudhin Datta

Periagaram Srinivasan Ravishankar

Rainer Kolb

Pritesh A Patel

William R Ruhe, Jr

Jean-Roch H Schauder

Phillip Thomas Matsunaga

Georgeta Masson

Abran Q Costales

John Robert Miller

Young A Chang

Karine Vincent

Ronald Lewis Hazelton

Abran Costales

Phillip Matsunaga

Pritesh Patel

William Raymond Ruhe

Disclosed is a dispersant composition, suitable for use in lubricating oils. The dispersant composition is a reaction product of (i) a polyalkenyl succinimide post-treated with a post-treating agent selected from the group consisting of an organic carbonate, an epoxide, a lactone, a hydroxyaliphatic carboxylic acid, and combinations thereof; and (ii) an acylating agent.

Dispersants, method of making, and using same

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&#x2033; 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 &#x3b4;, or (iii) the tangent (tan) &#x3b4;, and (c) assessing at least one of the G&#x2032;, G&#x2033;, &#x3b4;, or tan(&#x3b4;) determined.

Rheological methods to determine the predisposition of a polymer to form network or gel

Polymer compositions for use as viscosity modifiers comprising at least two ethylene-based copolymer components are provided. The polymer composition comprises (a) a first ethylene-&#x3b1;-olefin copolymer and (b) a second ethylene-&#x3b1;-olefin copolymer. The first ethylene-&#x3b1;-olefin copolymer (a) has an ethylene content from about 60 to about 80 wt % and the second ethylene-&#x3b1;-olefin copolymer (b) has an ethylene content of less than about 60 wt %. The first ethylene-&#x3b1;-olefin copolymer (a) has a Melt Flow Rate Ratio (MFRR), defined as the ratio of the MFR measured at 230&#xb0; C./21.6 kg and at 230&#xb0; C./2.16 kg, of greater than 30 and optionally also has a Melt Flow Rate (MFR) of at least about 1.5 g/10 min, measured by ASTM D 1238 condition L (230&#xb0; C./2.16 kg). The present disclosure is also directed to lubricant compositions comprising a lubricating basestock and a polymer composition of the present disclosure and is further directed to reducing gelation in the lubricant compositions.

Polymer compositions having improved properties as viscosity index improvers and use thereof in lubricating oils

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.

Viscosity index modifiers and lubricant compositions containing such viscosity index modifiers

Lube formulations and concentrates are disclosed herein. The formulations comprise copolymers of ethylene and propylene.

Lube additives

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San Francisco, CA, United States of America

Kirk Nass