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A surfactant and a surfactant formulation comprising at least one ionic surfactant of the general formula R1—O-(D)n-(B)m-(A)l-XY−M+ where R1 is a linear or branched, saturated or unsaturated, aliphatic and/or aromatic hydrocarbon radical having 8 to 30 carbon atoms, A is ethyleneoxy, B is propyleneo

A surfactant and a surfactant formulation comprising at least one ionic surfactant of the general formula R1—O-(D)n-(B)m-(A)l-XY−M+ where R1 is a linear or branched, saturated or unsaturated, aliphatic and/or aromatic hydrocarbon radical having 8 to 30 carbon atoms, A is ethyleneoxy, B is propyleneoxy, and D is butyleneoxy, l is from 0 to 99, m is from 0 to 99 and n is from 1 to 99, X is an alkyl or alkylene group having 0 to 10 carbon atoms, M+ is a cation, and Y− is selected from the group of sulfate groups, sulfonate groups, carboxylate groups and phosphate groups.

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1. An aqueous surfactant formulation comprising at least one ionic surfactant of the general formula R1—O-(D)n-(B)m-(A)l-XY−M+, whereR1 is selected from: iso-C17H35; a fatty alcohol mixture with linear C16H33 and C18H37 alkyl chains; derived from a C16 Guerbet alcohol, 2-hexyldecan-1-ol; derived fro

1. An aqueous surfactant formulation comprising at least one ionic surfactant of the general formula R1—O-(D)n-(B)m-(A)l-XY−M+, whereR1 is selected from: iso-C17H35; a fatty alcohol mixture with linear C16H33 and C18H37 alkyl chains; derived from a C16 Guerbet alcohol, 2-hexyldecan-1-ol; derived from a C24 Guerbet alcohol, 2-decyltetradecanol; or derived from a C28 Guerbet alcohol, 2-dodecylhexadecanol,A is ethyleneoxy,B is propyleneoxy, andD is butyleneoxy,l is from 0 to 99,m is from 5 to 9, andn is from 2 to 10,X is an alkyl or alkylene group having 0 to 10 carbon atoms,M+ is a cation, andY− is selected from the group consisting of sulfate groups, sulfonate groups, carboxylate groups and phosphate groups, wherethe A, B and D groups are in the form of two, three, four or more blocks beginning at the alcohol with the sequence D-B-A, the sum of l+m+n is in the range from 7 to 99 and the proportion of 1,2-butylene oxide, based on the total amount of butylene oxide, is at least 80%. 2. The surfactant formulation according to claim 1, wherein Y− is selected from the group of sulfate groups, sulfonate groups, and carboxylate groups, wherethe A, B and D groups are present to an extent of more than 80% in block form, the sum of l+m+n is in the range from 7 to 49, and the proportion of 1,2-butylene oxide, based on the total amount of butylene oxide in the molecule, is at least 90%. 3. The surfactant formulation according to claim 2, wherein R1 is a linear fatty alcohol having 16 or 18 carbon atoms and n is from 3 to 10. 4. The surfactant formulation according to claim 1, wherein the concentration of all surfactants together is 0.05 to 5% by weight, based on the total amount of the aqueous surfactant formulation. 5. A surfactant of the general formula R1—O-(D)n-(B)m-(A)l-XY−M+, whereR1 is selected from: iso-C17H35; a fatty alcohol mixture with linear C16H33 and C18H37 alkyl chains; derived from a C16 Guerbet alcohol, 2-hexyldecan-1-ol; derived from a C24 Guerbet alcohol, 2-decyltetradecanol; or derived from a C28 Guerbet alcohol, 2-dodecylhexadecanol,A is ethyleneoxy,B is propyleneoxy, andD is butyleneoxy,l is from 0 to 99,m is from 5 to 9 andn is from 2 to 10,X is an alkyl or alkylene group having 0 to 10 carbon atoms,M+ is a cation, andY− is selected from the group consisting of sulfate groups, sulfonate groups, carboxylate groups and phosphate groups, wherethe A, B and D groups are in the form of two, three, four or more blocks beginning at the alcohol with the sequence D-B-A, the sum of l+m+n is in the range from 7 to 99 and the proportion of 1,2-butylene oxide, based on the total amount of butylene oxide, is at least 80%. 6. The surfactant according to claim 5, wherein the sum of l+m+n is in the range from 7 to 49. 7. The surfactant according to claim 5, Wherein the proportion of 1,2-butylene oxide, based on the total amount of butylene oxide, is at least 90%. 8. The surfactant according to claim 5, wherein R1 is a fatty alcohol mixture with linear C16H33 and C18H37 alkyl chains,n is from 3 to 10, andY− is selected from the group consisting of sulfate groups, sulfonate groups, and carboxylate groups, where the A, B and D groups are present to an extent of more than 80% in block form, the sum of l+m+n is in the range from 7 to 49, and the proportion of 1,2-butylene oxide, based on the total amount of butylene oxide in the molecule, is at least 90%. 9. The surfactant according to claim 5, wherein R1 is a linear fatty alcohol having 16 or 18 carbon atoms and n is from 3 to 10. 10. The surfactant according to claim 5, wherein R1 is a linear fatty alcohol having 16 or 18 carbon atoms and the surfactant is selected from the group consisting of R1O-D2-B7—XY−M+,R1O-D3-B7—XY−M+,R1O-D5-B7—XY−M+, andR1O-D7-B7A10-XY−M+. 11. The surfactant according to claim 5, wherein R1 is a C16 Guerbet alcohol, 2-hexyldecan-1-ol.