| abstract |
The present invention relates to a surfactant composition containing a cationic surfactant (hereinafter referred to as a compound (A)), one or more compounds (hereinafter referred to as a compound (B)) selected from anionic aromatic compounds and bromide compounds and a cationic polymer (C), wherein compound (A) and (B) are selected when meeting the following condition: a combination of the compounds (A) and (B) ensures that that the viscosity (20° C.) of a solution prepared by mixing an aqueous solution S A of the compound (A) and an aqueous solution S B of the compound (B) in the same ratio is at least two times the viscosity of any one of the aqueous solutions (20° C.) before being mixed. |