Low viscosity, low volatility lubricating oil basestocks

A composition comprising one or more sulfur-containing compounds, wherein said one or more sulfur-containing compounds are produced by a process which comprises:

• reacting an olefin with a polythiol, optionally in the presence of a catalyst, under thiol-ene reaction conditions sufficient to produce the one or more sulfur-containing compounds;
• wherein the olefin is selected from the group consisting of an aliphatic olefin, an aromatic olefin, and a cycloaliphatic olefin;
• and the polythiol is selected from the group consisting of an aliphatic polythiol, aromatic polythiol, cycloaliphatic polythiol, an ether-, ester- or acid-containing polythiol, and a heteroatom-containing polythiol;
• and
• wherein the composition has a kinematic viscosity at a temperature of 100° C. (Kv100), measured according to ASTM standard D-445, from 2 to 300 cst, a kinematic viscosity at a temperature of 40° C. (Kv40), measured according to ASTM standard D-445, from 5 to 4000 cst, a viscosity index (VI), measured according to ASTM standard D-2270, from −100 to 300, and a Noack volatility, measured according to ASTM D-5800, of no greater than 90 percent.

A process for producing a composition comprising one or more sulfur-containing compounds, said process comprising:

• reacting an olefin with a polythiol, optionally in the presence of a catalyst, under thiol-ene reaction conditions sufficient to produce said composition;
• wherein the olefin is selected from the group consisting of an aliphatic olefin, an aromatic olefin, and a cycloaliphatic olefin;
• and the polythiol is selected from the group consisting of an aliphatic polythiol, aromatic polythiol, cycloaliphatic polythiol, an ether-, ester- or acid-containing polythiol, and a heteroatom-containing polythiol;
• and
• wherein the composition has a kinematic viscosity at a temperature of 100° C. (Kv100), measured according to ASTM standard D-445, from 2 to 300 cst, a kinematic viscosity at a temperature of 40° C. (Kv40), measured according to ASTM standard D-445, from 5 to 4000 cst, a viscosity index (VI), measured according to ASTM standard D-2270, from −100 to 300, and a Noack volatility, measured according to ASTM D-5800, of no greater than 90 percent.

A lubricating oil base stock comprising one or more compounds represented by the formula

• (R1)a(X)(R2)b
• wherein R1 and R2 are the same or different and are the residue of an olefin having from 4 to 40 carbon atoms, X is the residue of a polythiol, a is a value from 1 to 6, and b is a value from 0 to 6;
• wherein the olefin is selected from the group consisting of an aliphatic olefin, an aromatic olefin, and a cycloaliphatic olefin;
• and the polythiol is selected from the group consisting of an aliphatic polythiol, aromatic polythiol, cycloaliphatic polythiol, an ether-, ester- or acid-containing polythiol, and a heteroatom-containing polythiol;
• and
• wherein the lubricating oil base stock has a kinematic viscosity at a temperature of 100° C. (Kv100), measured according to ASTM standard D-445, from 2 to 300 cst, a kinematic viscosity at a temperature of 40° C. (Kv40), measured according to ASTM standard D-445, from 5 to 4000 cst, a viscosity index (VI), measured according to ASTM standard D-2270, from −100 to 300, and a Noack volatility, measured according to ASTM D-5800, of no greater than 90 percent.

A lubricating oil comprising a lubricating oil base stock as a major component, and a sulfur-containing cobase stock as a minor component;

• wherein said sulfur-containing cobase stock comprises one or more compounds represented by the formula
• (R1)a(X)(R2)b
• wherein R1 and R2 are the same or different and are the residue of an olefin having from 4 to 40 carbon atoms, X is the residue of a polythiol, a is a value from 1 to 6, and b is a value from 0 to 6,
• wherein the olefin is selected from the group consisting of an aliphatic olefin, an aromatic olefin, and a cycloaliphatic olefin;
• and the polythiol is selected from the group consisting of an aliphatic polythiol, aromatic polythiol, cycloaliphatic polythiol, an ether-, ester- or acid-containing polythiol, and a heteroatom-containing polythiol;
• and
• wherein the sulfur-containing cobase stock has a kinematic viscosity at a temperature of 100° C. (Kv100), measured according to ASTM standard D-445, from 2 to 300 cst, a kinematic viscosity at a temperature of 40° C. (Kv40), measured according to ASTM standard D-445, from 5 to 4000 cst, a viscosity index (VI), measured according to ASTM standard D-2270, from −100 to 300, and a Noack volatility, measured according to ASTM D-5800, of no greater than 90 percent.

A method for improving one or more of solubility and dispersancy of polar additives in a lubricating oil by using as the lubricating oil a formulated oil comprising a lubricating oil base stock as a major component, and a sulfur-containing cobase stock as a minor component;

• wherein said sulfur-containing cobase stock comprises one or more compounds represented by the formula
• (R1)a(X)(R2)b
• wherein R1 and R2 are the same or different and are the residue of an olefin having from 4 to 40 carbon atoms, X is the residue of a polythiol, a is a value from 1 to 6, and b is a value from 0 to 6;
• wherein the olefin is selected from the group consisting of an aliphatic olefin, an aromatic olefin, and a cycloaliphatic olefin;
• and the polythiol is selected from the group consisting of an aliphatic polythiol, aromatic polythiol, cycloaliphatic polythiol, an ether-, ester- or acid-containing polythiol, and a heteroatom-containing polythiol;
• and
• wherein the sulfur-containing cobase stock has a kinematic viscosity at a temperature of 100° C. (Kv100), measured according to ASTM standard D-445, from 2 to 300 cst, a kinematic viscosity at a temperature of 40° C. (Kv40), measured according to ASTM standard D-445, from 5 to 4000 cst, a viscosity index (VI), measured according to ASTM standard D-2270, from −100 to 300, and a Noack volatility, measured according to ASTM D-5800, of no greater than 90 percent.