The measurements r e v e a l an apparent ads o r p t i o n . A method i s o u t l i n e d t o c a l c u l a t e t h e r e a l a d s o r p t i o n o f polymers from t h e apparent a d s o r p t i o n u s i n g an equation d e r i v e d from experiments w i t h low molecular weight compounds. The adsorpt i o n o f v a r i o u s polymers such as l i n e a r p o l y e s t e r s , copolymers o f methylmethacrylate and v i n y l p y r i d i n e o r a c r y l i c a c i d on t i t a n i u m d i o x i d e and D-copperphthalocyanine from t o l u e n e s o l u t i o n s up t o h i g h e r polymer concentrations was determined. The apparent ads o r p t i o n isotherm o f t h e copolymers show a minimum and maxima. The o u t l i n e d method deduces a change o f polymer-solvent r a t i o i n t h e a d s o r p t i o n l a y e r . The enthalpy o f a d s o r p t i o n a t i n c r e a s i n g c o n c e n t r a t i o n s o f t h e p o l y e s t e r shows a d i f f e r e n t r e l a t i o n than t h e e n t h a l p y o f a d s o r p t i o n o f t h e copolymer o f methylmethacrylate and a c r y l i c a c i d a t i n c r e a s i n g polymer concentration. The temperat u r e change d u r i n g t h e a d s o r p t i o n i s discussed.