Aryl-PAG monoesters as lubricating oil base stocks
AssigneeDow Global Technologies LLC
InventorsYaokun Han, Martin R. Greaves, Cheng Shen, Tao Wang, Yong Zhao, Jieying Chen, Kang Chen
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Abstract
The present invention discloses aryl-polyalkylene glycol monoester compound compositions that are suitable for use as a base oil, particularly a base oil for use as an automotive lubricant. The compositions can generally be characterized by having low kinematic viscosity at 100° C. high viscosity index and low Noack volatility. The present invention also discloses lubricant formulations including such aryl-polyalkylene glycol monoester compounds with other materials such as an API Group I-V base oil and/or additives.
Claims15
A composition comprising an aryl-PAG monoester compound represented by the formula:
- R1O-(AO)n-(C═O)—Rx—R2
- where:
- R1 is a linear or branched alkyl or aryl with 1 to 18 carbon atoms;
- AO refers to a 1,2-alkylene oxide or mixture thereof in a random or block feeding order;
- n is an integer from 1 to 10;
- Rx is a linear or branched alkyl with 0 to 18 carbon atoms;
- and
- R2 is an aryl group, heteroaryl group, or arylalkyl group with 4 to 18 carbon atoms, any of which may optionally include oxygen or nitrogen or sulfur atoms.
A lubricant formulation comprising a base oil which is an aryl-PAG monoester compound represented by the formula:
- R1O-(AO)n-(C═O)—Rx—R2
- where:
- R1 is a linear or branched alkyl or aryl with 1 to 18 carbon atoms;
- AO refers to a 1,2-alkylene oxide or mixture thereof in a random or block feeding order;
- n is an integer from 1 to 10;
- Rx is a linear or branched alkyl with 0 to 18 carbon atoms;
- and
- R2 is an aryl group, heteroaryl group, or arylalkyl group with 4 to 18 carbon atoms, any of which may optionally include oxygen or nitrogen or sulfur atoms.
Dependencies are inferred from the claim text.