A surfactant composition comprising water and 1 to 99% by weight of a surfactant comprising: (a) 40 to 60% by weight of a monounsaturated C11 primary alcohol sulfate； and (b) 40 to 60% by weight of a secondary hydroxyalkyl C11 primary alcohol sulfate； wherein (a) and (b) are derived from undecylenic alcohol.Una composición de surfactante que comprende agua y 1 a 99% en peso de un surfactante que comprende: (a) 40 a 60% en peso de un sulfato de alcohol primario C11 monoinsaturado； y (b) 40 a 60% en peso de un sulfato de alcohol primario C11 de hidroxialquilo secundario； en la que (a) y (b) se derivan de alcohol undecilénico.
