Exxonmobil Research and Engineering Company

Kevin A Chinn

Gordon H Lee

Kevin John Kelly

Marcia G Rogers

The invention relates to oil compositions containing chromium catalyzed high viscosity index polyalphaolefins (HVI-PAO). In one embodiment the oil formulation comprises a chromium catalyzed HVI-PAO with a viscosity greater than 125 cSt kv 100&#xb0; C. and a viscosity index greater than 100, a second base stock with a viscosity of at least 2 cSt kv 100&#xb0; C. and less than 60 cSt kv 100&#xb0; C. wherein the second base stock is at least 120 cSt kv 100&#xb0; C. less than the chromium HVI-PAO, an ester with a viscosity of at least 2 and less than 6, the ester chosen from the group consisting of monoester, di-octyl sebacate and any combination thereof comprising more than 10 weight percent and less than 30 weight percent of the oil formulation, the oil formulation having a viscosity index of greater than 180.

Chromium HVI-PAO bi-modal lubricant compositions

The invention relates to oil compositions containing metallocene catalyzed high viscosity index polyalphaolefins (HVI-PAO). In one embodiment the oil formulation comprises a metallocene catalyzed HVI-PAO with a viscosity greater than 125 cSt kv 100&#xb0; C. and a viscosity index greater than 100, a second base stock with a viscosity of at least 2 cSt kv 100&#xb0; C. and less than 60 cSt kv 100&#xb0; C. wherein the second base stock is at least 60 cSt kv 100&#xb0; C. less than the metallocene HVI-PAO, an ester with a viscosity of at least 2 and less than 6, the ester comprising more than 10 weight percent and less than 30 weight percent of the oil formulation, the oil formulation having a viscosity index of greater than 195. The use of metallocene catalyzed HVI-PAOs in a bimodal blend provides advantages in improved shear stability, and other properties related to shear stability.

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Mount Laurel, NJ, United States of America

Kevin A Chinn