Low transition temperature mixtures and lubricating oils containing the same
AssigneeExxonMobil Chemical Patents Inc.
InventorsAbhimanyu O. Patil, Satish Bodige, Thilina N. Gunasekara
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Abstract
Low transition temperature mixtures (LTTMs) comprising a eutectic mixture of a quaternary amine and a polyol such as glycol are provided. The LTTMs can provide various beneficial properties, such as highly desirable viscosity index, low glass transition temperatures, and/or high kinematic viscosities relative to the molecular weight of the mixture components. The mixtures can be advantageously used as co-base stocks in lubricating oil compositions.
Claims18
A composition comprising a eutectic mixture of:
- a first component comprising a quaternary amine having at most 6 carbon atoms per molecule;
- and
- a second component comprising an ethylene glycol;
- wherein a molar ratio of the first component to the second component in the mixture is in a range from 1:1 to 1:4, and the composition exhibits a glass transition temperature of no higher than −70° C., a viscosity index of at least 120, and a kinematic viscosity at 100° C. in a range from 2.0 to 10 cSt.
A lubricating oil comprising a primary lubricating oil base stock and a secondary lubricant component having a composition capable of forming a eutectic mixture, wherein the eutectic mixture comprises a first component comprising a quaternary amine having at most 6 carbon atoms per molecule and a second component comprising an ethylene glycol wherein:
- the eutectic mixture comprises an equilibrium phase between the first component and the second component;
- a molar ratio of the first component to the second component in the eutectic mixture ranges from 1:1 to 1:4;
- and
- the eutectic mixture exhibits a glass transition temperature of no higher than −70° C., a viscosity index of at least 120, and a kinematic viscosity at 100° C. in a range from 2.0 to 10 cSt.
A composition comprising a eutectic mixture of:
- a first component comprising a quaternary amine having at most 6 carbon atoms per molecule;
- and
- a second component comprising an ethylene glycol;
- wherein a molar ratio of the first component to the second component in the mixture is in a range from 1:2 to 1:4, and the composition exhibits a glass transition temperature of no higher than −70° C., a viscosity index of at least 140, and a kinematic viscosity at 100° C. in a range from 3.0 to 6 cSt.
A composition comprising a eutectic mixture of:
- a first component comprising a quaternary amine having at most 6 carbon atoms per molecule;
- and
- a second component comprising an ethylene glycol;
- wherein a molar ratio of the first component to the second component in the mixture is in a range from 1:1 to 1:4, and the composition exhibits a glass transition temperature of no higher than −70° C., a viscosity index of at least 120, and a kinematic viscosity at 100° C. in a range from 2.0 to 10 cSt
- wherein the mixture is formed in the absence of any additional solvent that dissolves both compounds.
Dependencies are inferred from the claim text.