Mutual diffusion coefficients of acryl adhesiveacetate ester (methyl acetate, ethyl acetate, n-propyl acetate) systems were measured at 313.15 It using a sorption-desorption apparatus with a quartz spring. Further, those of an acryl adhesive-ethyl acetate system at 333.15 K were also measured. The concentration range of solute measured was from 0.0127 to 0.159 in mass fraction. Mutual diffusion coefficients obtained depended on concentration, temperature and molecular weight.