Man Wai Tsang

US Patent:

20110077180, Mar 31, 2011

Filed:

Sep 30, 2009

Appl. No.:

12/570974

Inventors:

Qunlai Chen - Walnut Creek CA, US
Man Hon Tsang - Oakland CA, US
Gaurav Bhalla - Hercules CA, US

International Classification:

C07D 207/40
C07F 11/00
C10M 135/18

US Classification:

508289, 548404, 556 63, 508363

Abstract:

The invention is directed to oil soluble additive compositions, lubricating oil compositions derived from a process for preparing a sulfurized oil soluble molybdenum complex having reduced active sulfur comprising: reacting an acidic molybdenum compound with an amide derived from a carboxylic acid component an polyamine component in a ratio from 2:1 to 1:1; there after sulfurizing to provide a sulfurized oil soluble molybdenum which is subsequently treated with at least one compound capable of reacting with the active sulfur of step b).

US Patent:

20190177639, Jun 13, 2019

Filed:

Oct 22, 2018

Appl. No.:

16/166219

Inventors:

- San Ramon CA, US
Maryam Sepehr - San Ramon CA, US
Sara Yue Zhang - Richmond CA, US
David Morgan - Pleasanton CA, US
Man Hon Tsang - Richmond CA, US

International Classification:

C10M 143/04
C10M 169/04

Abstract:

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.