A grease composition comprising a thickener and a lubricating base oil, wherein the lubricating base oil has a viscosity in the range of from 5-1000 cSt (at 40° C.). The thickener is present in an amount of 5-40 wt. %, based on total weight of the grease composition. The thickener comprises an ester terminated oligomer which has the general formula: “R1—O—[CO—R2—CO—NH—R3—NH—CO—R2—CO]n-O—R1”. “R1” represents a hydrocarbon group containing 4-22 carbon atoms. “R2” represents a hydrocarbon group containing 4-42 carbon atoms. “R3” represents a hydrocarbon group containing 2-9 carbon atoms. “n” represents an integer in the range of 1-20. The weight ratio between the lubricating base oil and the ester terminated oligomer (oil/oligomer) is larger than 1. The grease composition can be used for lubricating a mechanical component having a metal surface and/or for protecting a mechanical component having a metal surface against corrosion, wear and/or fretting.

A grease composition contains a mixture of a lubricating base oil, an ester-terminated polyamide and at least one polyolefin. The ester-terminated polyamide has the formula:
R1-O—CO—R2-CO—[NH—R3-NH—CO—R2-CO]n-O—R1.
R1 contains 4-22 carbon atoms, R2 contains 4-42 carbon atoms, R3 contains 2-9 carbon atoms and n is an integer in the range of 1-20. The grease composition can be used for lubricating a mechanical component having a metal surface and/or for protecting a mechanical component having a metal surface against corrosion, wear and/or fretting.

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: $\frac{\left(A+D\right)}{\left(B+C\right)}0.05$
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.

A lubricant composition comprises a base oil and at least one of carbon nanotubes with a diameter of 0.4 to 9.0 nm in an amount of 0.001 to 0.08% by mass relative to a total mass of the composition, and the composition has a consistency of 200 to 440.

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:

[00001]$\frac{\left(A+D\right)}{\left(B+C\right)}0.05$

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.

An antifriction coating composition which comprises: a resin binder, a polyamide thickener, solvent and a solid lubricant wherein the resin binder comprises a mixture of phenolic resin, epoxy resin and optionally a silicone resin.

A grease composition comprising a lubricating base oil and a thickener, which thickener comprises an ester-terminated oligomer and a polymer. The polymer is a polyolefin. The ester-terminated oligomer has the general formula: R1O[COR2CONHR3NHCOR2CO].sub.nOR1. R1 each independently represent a hydrocarbon group containing 4-22 carbon atoms. R2 represents a hydrocarbon group containing 4-42 carbon atoms. R3 represents a hydrocarbon group containing 2-9 carbon atoms. n represents an integer in the range of 1-20. A method for preparing the present grease composition. The present grease composition can be used for (a) lubricating a mechanical component having a metal surface and (b) protecting a mechanical component having a metal surface against corrosion, wear and/or fretting.

A grease composition comprising a thickener and a lubricating base oil, wherein the lubricating base oil has a viscosity in the range of from 5-1000 cSt (at 40 C.). The thickener is present in an amount of 5-40 wt. %, based on total weight of the grease composition. The thickener comprises an ester terminated oligomer which has the general formula: R1-O[COR2-CONHR3-NHCOR2-CO]n-OR1. R1 represents a hydrocarbon group containing 4-22 carbon atoms. R2 represents a hydrocarbon group containing 4-42 carbon atoms. R3 represents a hydrocarbon group containing 2-9 carbon atoms. n represents an integer in the range of 1-20. The weight ratio between the lubricating base oil and the ester terminated oligomer (oil/oligomer) is larger than 1. The grease composition can be used for lubricating a mechanical component having a metal surface and/or for protecting a mechanical component having a metal surface against corrosion, wear and/or fretting.

The present disclosure provides a polyamide grease thickening agent having the structure according to Formula I: (MCA-DA-)(PCA-DA)y-PCA-(DA-PCA)y(-DA-MCA) (I). In Formula I, at each occurrence PCA is independently a reacted polycarboxylate, at each occurrence MCA is independently a reacted monocaboxylate, at each occurrence DA is independently a reacted n-alkyl diamine, and y is 0 or a non-zero integer. Additionally, in Formula I, a weight-average molecular weight of the polyamide grease thickener is in a range of from about 450 g/mol to about 2600 g/mol. Additionally, in Formula I, the structure includes at least 4 amide bonds and at least two internal aromatic moieties are di-substituted in a para position.

A lubricant composition comprises a base oil and at least one of carbon nanotubes with a diameter of 0.4 to 9.0 nm in an amount of 0.001 to 0.08% by mass relative to a total mass of the composition, and the composition has a consistency of 200 to 440.