Exxonmobil Research and Engineering Company

James E Spagnoli

Sarvesh K Agrawal

John P Doner

Chengrong X Wang

David Alan Blain

Todd Timothy Nadasdi

Spencer Troy Stober

Barbara Anne Carfolite

John Kenneth Graham

Norman Charles Sundstrom

Paul Richard Grives

James Fredrick Van Auken

The present disclosure provides a grease composition with improved water resistance and mechanical stability at high-temperatures, including: at least one base oil; a water insoluble thickener; and a low molecular weight thixotropic polyamide composition having molecular weight distribution characteristics meeting the requirement described by the relationship: where A=the % mass of the polyamide composition with a molecular weight greater than 1700 AMU; B=the % mass of the polyamide composition with a molecular weight between 1100 AMU and 1300 AMU; C=the % mass of the polyamide composition with a molecular weight between 700 AMU and 1000 AMU; and D=the % mass of the polyamide composition with a molecular weight of 600 AMU or lower (determined by GPC). The grease composition of the present disclosure provides a less than 50 penetration point change as determined by ASTM-D7342, a less than 10 mg weight loss as determined by ASTM-D4170, or both.

Grease compositions with improved performance and methods of preparing and using the same

Grease compositions are provided that can have one or more unexpectedly beneficial low temperature properties even though the grease compositions are formed from lower value components that traditional low temperature greases. The unexpectedly beneficial low temperature properties can be achieved in part by grease compositions that include a naphthenic base stock having a viscosity index of roughly 120 or less and/or a pour point of &#x2212;20&#xb0; C. or more while having a naphthenes content of 60 wt % or more. In some aspects, the naphthenic base stock can have an aromatics content of 20 wt % or less.

Grease compositions for low temperature operation

A continuous process for preparing lithium complex greases improved by using a complexing agent of dimethyl glutarate, dimethyl adipate, glutaric acid, adipic acid, or mixtures thereof, and preferably also a specialized flash chamber to achieve a penetration split (60X-UW) of within &#x2212;20 mm/10 to 10 mm/10, a roll stability (D1831) of &#x3c;30 mm/10, and a dropping point (D2265) of &#x3e;240&#xb0; C.

Method and equipment for making a complex lithium grease

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Leland, NC, United States of America

James E Spagnoli