Surface active agent composition and emulsifying agent composition for aqueous resin dispersion

An emulsifying agent composition for aqueous resin dispersion comprising a polymerizable monomer surface active agent represented by the general formula (I):

• and a polymerizable dimer surface active agent represented by the general formula (II):
• wherein, in the general formulae (I) and (II), R1s each are independently an alkyl group having 8 to 30 carbon atoms, R2s each are independently hydrogen or a methyl group, As each are independently an alkylene group having 2 to 4 carbon atoms or a substituted alkylene group, ns each are independently an integer from 0 to 200, and Xs each are independently hydrogen or one of substituents represented as follows:
• wherein, in the formula of X, Ms each are independently an alkali metal, NH4 or an alkanolamine residue, and R3s each are independently a residue other than X in the general formula (I) or the general formula (II).