High-pressure phase equilibrium data have been measured for the system propane + Boltorn H3200 at temperatures of (300 to 470) K and at pressures tip to 14 MPa. Boltorn H3200 is a hydroxyl-functional hyperbranched polyester whose OH-end groups are functionalized with a mixture of eicosanoic and docosanoic acid leading to C(20/22) alkane chains as end groups. The phase equilibrium measurements were performed according to the synthetic method using the Cailletet apparatus. Besides two-phase fluid phase equilibria, a three-phase curve liquid-liquid-vapor, a three-phase curve solid polymer-liquid-liquid, and a three-phase curve solid polymer-liquid-vapor were measured also.