| abstract |
The present invention provides a cationic surfactant (hereinafter referred to as compound (A)), at least one compound selected from the group consisting of an anionic aromatic compound and brominated compound (hereinafter referred to as compound (B)), and cationic Either aqueous solution (20) before the viscosity at 20 ° C of the aqueous solution containing the polymer (C) and equally mixing the aqueous solution (S A ) of the compound ( A ) and the aqueous solution (S B ) of the compound (B) It is surfactant composition which is a combination which becomes at least 2 times higher than the viscosity of (degree. C.). |