公开(公告)号：US10676689B2

公开(公告)日：2020-06-09

申请号：US16215916

申请日：2018-12-11

Applicant: ExxonMobil Research and Engineering Company

Inventor： Sarvesh K. Agrawal ,  James E. Spagnoli ,  David A. Blain

IPC: C10M169/04 ,  C10M111/02 ,  C10M169/02 ,  C10M171/02 ,  C10M101/02 ,  C10M145/14

Abstract: 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 −20° 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.

公开(公告)号：US10774286B2

公开(公告)日：2020-09-15

申请号：US16217560

申请日：2018-12-12

Applicant: ExxonMobil Research and Engineering Company

Inventor： Sarvesh K. Agrawal ,  James E. Spagnoli ,  Chengrong Wang

IPC: C10M169/00 ,  C10M119/24 ,  C10M115/08 ,  C10M169/06 ,  C10M113/10 ,  C10M117/00 ,  C10M129/95 ,  C10M133/00 ,  C10M135/36 ,  C10M137/10 ,  C10M139/00 ,  C10M145/02 ,  C10M149/18 ,  C10M161/00

Abstract: 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: ( A + D ) ( B + C ) ≥ 0.05 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.