High pressure phase behavior data for poly(propyl acrylate) and poly(propyl methacrylate) with supercritical CO2, ethylene, propane, butane, propylene, 1-butene, dimethyl ether, and CHICF2 were measured in the temperature range from 23 ℃ to 186 ℃ and at pressures up to 2,400 bar. The cloud point were obtained at dissolved pressure below 2,070, 1,400, 1,880, 450, 2,200, 250, and 150 bar for poly(propyl acrylate) in supercritical CO2, ethylene, propane, propylene, butane, 1-buthen, and dimethyl ether, respectively. The temperature range is 23-175 ℃. The poly(propyl methacrylate) does not dissolve in CO2 at temperature of 240 ℃ and pressure 2,900 bar. The poly(propyl methacrylate)-propane, poly(propyl methacrylate)-butane, poly(propyl methacrylate)-propylene, poly(propyl methacrylate)-1-butene, and poly(propyl methacrylate)-CHClF2 systems were dissolved at the pressures less than 2,390 bar, below 2,100 bar, below 570 bar, below 310 bar, below 300 bar, and below 170 bar, respectively. The temperature range shows from 40 to 186 ℃. The phase behavior of between binary poly(propyl acrylate)-CO2 and poly(propyl acrylate)-dimethyl ether system were measured from upper critical solution temperature region to lower critical solution temperature region with added dimethyl ether concentrations of 5, 15 and 50 wt%.