US 10,704,007 B2 · Composition and method of forming the same

Abstract

A composition comprises the reaction product of a dithiophosphate derivative and an amine. The reaction product is present in the composition in an amount of at least about 25 wt. %. The composition may include additional components. A method of forming the composition comprises the step of combining the dithiophosphate derivative and the amine to form the composition. A method of increasing thermal stability of a dithiophosphate derivative comprises the step of combining the dithiophosphate derivative and an amine. The dithiophosphate derivative can decompose to form hydrogen sulfide (H2S). However, the amine substantially prevents thermal decomposition of the dithiophosphate derivative. An example of the dithiophosphate derivative is 3-(di-isobutoxy-thiophosphorylsulfanyl)-2-methyl-propanoic acid. An example of the amine is ditridecyl amine. The composition can be used for a variety of applications. For example, the composition can be used as an antiwear compound/additive in lubricants, metalworking fluids, hydraulic fluids, etc.

Claims17

Dependent claims

A composition comprising:

a reaction product of:
a dithiophosphate derivative of general formula (I):
wherein R1 and R2 independently of one another are C3-C18 alkyl, C5-C12 cycloalkyl, C5-C6 cycloalkylmethyl, C9-C10 bicycloalkylmethyl, C9-C10 tricycloalkylmethyl, phenyl, or C7-C24 alkylphenyl, alternatively R1 and R2 together are (CH3)2C(CH2)2;
R3 is hydrogen or methyl;
and the sum of n+m is at least 1, and
an amine having a molecular weight of less than 2,250 Da;
wherein the reaction product comprises index ranging from 0.25 to 2.0;
and
wherein the composition meets Occupational Safety & Health Administration (OSHA) Standard 29 CFR 1910.1000, TABLE Z-2 for hydrogen sulfide (H2S) exposure which requires that exposures not exceed 20 parts per million (ppm) subject to an exception that if no other measurable exposure occurs during an 8-hour work shift, exposures may exceed 20 ppm, but not more than 50 ppm, for a single time period up to 10 minutes.

6 more elements

Dependencies are inferred from the claim text.

Composition and method of forming the same

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Composition and method of forming the same

Life of this patent

Abstract

Claims17