Monolayers of poly(vinyl acetate) (PVAc) + poly(4-hydroxystyrene) (P4HS) blends on an aqueous subphase (pH = 2.0) have been studied over the whole surface concentration (0 less than or equal to Gamma less than or equal to collapse) and blend composition (mole fraction of PVAc x(1) = 0-1) ranges. Besides a classical surface tension technique, a surface light scattering by thermally excited capillary waves spectrometer has been used. The results obtained include the static surface pressure Pi and elasticity epsilon(st), as well as the dynamic dilatational elasticity epsilon(0)(omega) and viscosity kappa(omega) as a function of frequency omega. The analysis of the Pi vs Gamma curves point out that the aqueous-air interface behaves as a good solvent for the monolayers of PVAc-rich blends, while it is a near-Theta solvent for P4HS-rich blends. The critical exponent nu calculated from the static results in the semidilute regime is in excellent agreement with the values obtained from kappa(omega) for all the samples. The relaxation times obtained from the dynamic data are compatible with the description of the monolayers as 2-D gel-like systems. In the concentrated regime it is found that epsilon(st) > epsilon(0), which suggests the existence of diffusive processes out of the plane of the interface.