Three different supercritical fluids, CO2, dimethyl ether (DME), and chlorodifluoromethane (CHCIF2), were investigated as potential solvents for processing two (meth)acrylate polymers. High pressure phase behavior data to 505 K and 265.7 MPa were reported for poly(hydroxypropyl methacrylate) [PHPMA] and poly(hydroxypropyl acrylate) [PHPA] in the supercritical fluid solvents + cosolvent system. Cloud-point curves for the PHPA and PHPMA in the supercritical DME show about a 40.0 MPa pressure difference of constant temperature at similar to 373 K. The phase behavior for the PHPMA + DME + 2-hydroxypropyl methacrylate (2-HPMA) and PHPA + DME + 2-hydroxypropyl acrylate (2-HPA) systems were measured from changes of the pressure-temperature curve slope, and with cosolvent concentrations of w(3) = 0-0.463 (2-HPMA) and w(3) = 0-0.453 (2-HPA), respectively. The PHPMA + DME + w(3) = 0.0-0.238 CO2 and PHPA + DME + w(3) = 0.0-0.210 CO2 mixture show UCST-type behavior with a negative slope, and then the pressure increases smoothly for temperatures in the range of 323-492K. PHPMA and PHPA do not dissolve in pure CO2 at a temperature of 518 K and pressure of 280.0 MPa. The location of the PHPMA + CO2 cloud-point curve shifts to lower temperatures and pressures when w(3) = 0.40-0.66 2-HPMA was added to the PHPMA + CO2 solution. The phase behavior for the PHPA + CO2 + w(3) = 0.35-0.68 2-HPA system changes the pressure-temperature curve from an upper critical solution temperature (UCST) region to a lower critical solution temperature (LCST) region as the 2-HPA concentration increases. The PHPMA + CO2 + w(3) = 0.689 2-HPMA phase behavior curve intersects a fluid -> liquid + vapor (LV) curve at similar to 393 K and similar to 16.0 MPa. (C) 2012 Elsevier B.V. All rights reserved.