The present invention is a surfactant composition containing (a) a branched alkyl sulfosuccinate ester having a branched alkyl group with 9 or 10 carbons and (b) a surfactant [excluding (a)].

In addition to an organic solvent (B), an inorganic metal compound (C), and water as component (D), a sulfonate composition disclosed in the present invention contains a compound (A) represented by ROOC—(CH.sub.2).sub.p—CH(SO.sub.3M)—CH.sub.2—(CH.sub.2).sub.q—COOR′, where M represents a cation, R and R′ independently represent a group selected from an alkyl group with 10 carbons and an alkenyl group with 10 carbons, p and q each represent a number of 0 to 18, and a total of p and q is 0 to 18. The mass ratios of components (A), (B), (C), and (D) to the total content of the components (A)-(D) are as follows: 0.05≤A/(A+B+C+D)≤0.71, B/(A+B+C+D)≥0.05, C/(A+B+C+D)>0, and 0.10<D/(A+B+C+D)<0.60.

In addition to an organic solvent (B), an inorganic metal compound (C), and water as component (D), a sulfonate composition disclosed in the present invention contains a compound (A) represented by ROOC—(CH.sub.2).sub.p—CH(SO.sub.3M)—CH.sub.2—(CH.sub.2).sub.q—COOR′, where M represents a cation, R and R′ independently represent a group selected from an alkyl group with 10 carbons and an alkenyl group with 10 carbons, p and q each represent a number of 0 to 18, and a total of p and q is 0 to 18. The mass ratios of components (A), (B), (C), and (D) to the total content of the components (A)-(D) are as follows: 0.05≤A/(A+B+C+D)≤0.71, B/(A+B+C+D)≥0.05, C/(A+B+C+D)>0, and 0.10<D/(A+B+C+D)<0.60.

A method for producing a sulfonate composition including, reacting a diester of a predetermined unsaturated carboxylic acid [hereinafter referred to as component (A)] in the presence of one or more solvents selected from (B) (B1) an organic solvent [hereinafter referred to as component (B1)] and (B2) water [hereinafter referred to as component (B2)] with (C) a sulfonating agent to obtain a mixture containing (S) a predetermined sulfonate having a diester structure [hereinafter referred to as component (S)], and removing an insoluble component from the mixture, wherein in the mixture from which the removal of the insoluble component is made, the content of component (B1) to a total content of components (S), (B1) and (B2) is 0.05 or more and 0.65 or less, and the content of component (B2) to the total content of components (S), (B1) and (B2) is 0.03 or more and 0.26 or less.

A method for producing a sulfonate composition including, reacting a diester of a predetermined unsaturated carboxylic acid [hereinafter referred to as component (A)] in the presence of one or more solvents selected from (B) (B1) an organic solvent [hereinafter referred to as component (B1)] and (B2) water [hereinafter referred to as component (B2)] with (C) a sulfonating agent to obtain a mixture containing (S) a predetermined sulfonate having a diester structure [hereinafter referred to as component (S)], and removing an insoluble component from the mixture, wherein in the mixture from which the removal of the insoluble component is made, the content of component (B1) to a total content of components (S), (B1) and (B2) is 0.05 or more and 0.65 or less, and the content of component (B2) to the total content of components (S), (B1) and (B2) is 0.03 or more and 0.26 or less.

The present invention is a surfactant composition containing (a) a branched alkyl sulfosuccinate ester having a branched alkyl group with 9 or 10 carbons and (b) a surfactant [excluding (a)].

The present invention is a surfactant composition containing (a) a branched alkyl sulfosuccinate ester having a branched alkyl group with 9 or 10 carbons and (b) a surfactant [excluding (a)].

The present invention relates to a dispersant for graphite and graphene and its application. The composition is a synergistic combination of alkyl sulfosuccinate and polyalkylene glycol. Appropriate adding amount thereof can quickly and easily disperse graphite and graphene in the medium, improve its dispersion uniformity and stability, delay its sedimentation, and inhibit its re-accumulation. Furthermore, the present invention can apply graphite and graphene to other media besides non-water-based or organic solvents. The composition of the present invention does not contain flammable volatile chemicals, any fluorine-, silicon- or phosphorus-based compounds, or any aromatic substances. The present invention can not only reduce environmental pollution but also improve the operational safety of relevant personnel.

The present invention relates to a dispersant for graphite and graphene and its application. The composition is a synergistic combination of alkyl sulfosuccinate and polyalkylene glycol. Appropriate adding amount thereof can quickly and easily disperse graphite and graphene in the medium, improve its dispersion uniformity and stability, delay its sedimentation, and inhibit its re-accumulation. Furthermore, the present invention can apply graphite and graphene to other media besides non-water-based or organic solvents. The composition of the present invention does not contain flammable volatile chemicals, any fluorine-, silicon- or phosphorus-based compounds, or any aromatic substances. The present invention can not only reduce environmental pollution but also improve the operational safety of relevant personnel.