Abstract: The molten rheological properties of chloro-polyether and polyepichlo-rohydrin blends with a coupling agent and without coupling agents, were studied. It was found that coupling agents affect the pseudoplastic behayior of the blend melts. Shear stress-shear rate data of the blends at different temperatures constitute "master curves" at constant blending composition, when plotted as τ vs aTγ, and τ-γ data of the blends within a certain range of composition also constitute "master curves", when plotted as τ vs aTaφγ. A rheological equation which describes the relationship between viscosity and shear stress of the blends was established.