Chevron Oronite Company LLC

Exxonmobil Chemical Patents Inc.

Sara Yue Zhang

David L Morgan

Maryam Sepehr

Peijun Jiang

John Robert Hagadorn

Jo Ann M Canich

Periagaram Srinivasan Ravishankar

Rainer Kolb

Jingwen Zhang

Sarah J Mattler

Man Hon Tsang

Pritesh A Patel

Ian G Elliott

Chase A Eckert

Shuhui Kang

Pritesh Arjunbhai Patel

Lubricating oil compositions are provided which contain bimodal copolymer compositions, and in particular bimodal ethylene-α-olefin copolymer compositions. The copolymer compositions comprise first and second ethylene-α-olefin copolymer components. The bimodal compositions are particularly useful as viscosity or rheology modifiers, e.g., in lubricating oil compositions. Lubricating oil compositions comprising the copolymer compositions advantageously exhibit enhanced shear stability index (SSI) and thickening efficiency (TE) values, while maintaining excellent low-temperature properties such as pour point, mini-rotary viscometer viscosity, and cold crank simulation performance.

Bimodal copolymer compositions useful as oil modifiers and lubricating oils comprising the same

Provided is a lubricating oil composition that includes a major amount of a lubricant base oil and a minor amount of a viscosity index improver comprising a syndiotactic propylene-based ethylene-propylene copolymer comprising: a) 2 to 20% by weight of ethylene, b) 80 to 98% by weight of propylene; c) 50 to 99% of rr triads; and d) Mw (LS) of 10 to 250 kg/mol.

Lubricating oil composition with viscosity modifier based on syndiotactic propylene-based ethylene- propylene copolymers with improved properties

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Danville, CA, United States of America

Sara Yue Zhang