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An alkali metal sulfonate mixture for metalworking applications, a method for making the sulfonate mixture, and compositions containing the sulfonate mixture. The mixture includes a reaction product of a first synthetic mono-hydrocarbyl substituted sulfonic acid having from about 20 to about 50 carb

An alkali metal sulfonate mixture for metalworking applications, a method for making the sulfonate mixture, and compositions containing the sulfonate mixture. The mixture includes a reaction product of a first synthetic mono-hydrocarbyl substituted sulfonic acid having from about 20 to about 50 carbon atoms in the hydrocarbyl substituent, a second synthetic mono-hydrocarbyl substituted sulfonic acid having from about 10 to about 16 carbon atoms in the hydrocarbyl substituent, and an inorganic alkali metal base. The reaction product has a number average molecular weight ranging from about 400 to about 500 and a substantially bimodal molecular weight distribution.

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What is claimed is: 1. An alkali metal sulfonate mixture, the mixture consisting essentially of a reaction product of a first synthetic mono-hydrocarbyl substituted sulfonic acid having from about 20 to about 50 carbon atoms in the hydrocarbyl substituent, a second synthetic mono-hydrocarbyl substi

What is claimed is: 1. An alkali metal sulfonate mixture, the mixture consisting essentially of a reaction product of a first synthetic mono-hydrocarbyl substituted sulfonic acid having from about 20 to about 50 carbon atoms in the hydrocarbyl substituent, a second synthetic mono-hydrocarbyl substituted sulfonic acid having from about 10 to about 16 carbon atoms in the hydrocarbyl substituent, and an inorganic alkali metal base, wherein the reaction product has a number average molecular weight ranging from about 400 to about 425 and a substantially bimodal molecular weight distribution of a neutral mono-hydrocarbyl substituted sulfonate mixture, wherein the sulfonate mixture provides a substantially stable emulsion suitable for metal working applications in an aqueous emulsion of the sulfonate mixture and from about 80 to about 99 percent by weight water. 2. The alkali metal sulfonate mixture of claim 1, wherein the first synthetic monohydrocarbyl substituted sulfonic acid is selected from the group consisting of dimerized propylene tetramer benzene sulfonic acid and dimerized butylenes tetramer benzene sulfonic acid. 3. The alkali metal sulfonate mixture of claim 2, wherein the second synthetic monohydrocarbyl substituted sulfonic acid is selected from the group consisting of linear dodecylbenzene sulfonic acid and branched dodeceylbenzene sulfonic acid. 4. The alkali metal sulfonate mixture of claim 1, wherein the second synthetic monohydrocarbyl substituted sulfonic acid is selected from the group consisting of linear dodecylbenzene sulfonic acid and branched dodeceylbenzene sulfonic acid. 5. The alkali metal sulfonate mixture of claim 1, wherein the inorganic alkali metal base is selected from the group consisting of sodium hydroxide, potassium hydroxide, lithium hydroxide, sodium carbonate, potassium carbonate, and lithium carbonate. 6. The alkali metal sulfonate mixture of claim 1, wherein the first synthetic monohydrocarbyl substituted sulfonic acid has a number average molecular weight ranging from about 500 to about 900. 7. The alkali metal sulfonate mixture of claim 1, wherein the second synthetic monohydrocarbyl substituted sulfonic acid has a number average molecular weight ranging from about 300 to about 380. 8. The alkali metal sulfonate mixture of claim 1, wherein the mixture contains from about 50 to about 60 percent by weight active sulfonate. 9. A metalworking fluid composition comprising the alkali metal sulfonate mixture of claim 1. 10. The metalworking fluid composition of claim 9, further comprising a succinimide dispersant having a weight average molecular weight ranging from about 750 to about 1500 Daltons. 11. A method for working metals comprising applying a metalworking fluid composition comprising the alkali metal sulfonate mixture of claim 1 to the metal. 12. A concentrate for a metalworking fluid composition, the concentrate comprising from about 0.5 wt. % to about 85 wt. % of the alkali metal sulfonate mixture of claim 1. 13. A method for making an alkali metal sulfonate mixture having improved properties, the method comprising the steps of: charging a mixture of sulfonic acids to a reaction vessel, the mixture of sulfonic acids consisting essentially of a first synthetic mono-hydrocarbyl substituted sulfonic acid having from about 20 to about 50 carbon atoms in the hydrocarbyl substituent, and a second synthetic mono-hydrocarbyl substituted sulfonic acid having from about 10 to about 16 carbon atoms in the hydrocarbyl substituent; neutralizing the mixture of sulfonic acids with an alkali metal inorganic base selected from the group consisting of sodium hydroxide, potassium hydroxide, lithium hydroxide, sodium carbonate, potassium carbonate, and lithium carbonate to form a reaction product in an oleaginous reaction medium; and removing water from the reaction product to provide the alkali metal sulfonate mixture, wherein the mixture has a number average molecular weight ranging from about 400 to about 425 and a substantially bimodal molecular weight distribution of a neutral mono-hydrocarbyl substituted sulfonate mixture, and wherein the sulfonate mixture provides a substantially stable emulsion suitable for metal working applications in an aqueous emulsion of the sulfonate mixture and from about 80 to about 99 percent by weight water. 14. The method of claim 13, wherein the first synthetic mono-hydrocarbyl substituted sulfonic acid is selected from the group consisting of dimerized propylene tetramer benzene sulfonic acid and dimerized butylenes tetramer benzene sulfonic acid. 15. The method of claim 14, wherein the second synthetic mono-hydrocarbyl substituted sulfonic acid is selected from the group consisting of linear dodecylbenzene sulfonic acid and branched dodeceylbenzene sulfonic acid. 16. The method of claim 13, wherein the second synthetic mono-hydrocarbyl substituted sulfonic acid is selected from the group consisting of linear dodecylbenzene sulfonic acid and branched dodeceylbenzene sulfonic acid. 17. The method of claim 13, wherein the first synthetic mono-hydrocarbyl substituted sulfonic acid has a number average molecular weight ranging from about 500 to about 900. 18. The method of claim 13, wherein the second synthetic mono-hydrocarbyl substituted sulfonic acid has a number average molecular weight ranging from about 300 to about 380. 19. The method of claim 13, wherein the alkali metal sulfonate mixture contains from about 50 to about 60 percent by weight active sulfonate. 20. A method for working metals comprising applying a metalworking fluid composition comprising the alkali metal sulfonate mixture made by the method of claim 13 to the metal.