The phase equilibrium measurements for the pseudobinary supercritical polypropylene-propane system reported in the previous paper are extended to include pseudoternary systems where a polar cosolvent, in this case a low molecular weight alcohol, has been added. The cloud-point isopleths near the critical composition show the range of behavior to be expected as the type V pseudobinary system, polypropylene-propane, described in the previous paper, is transformed into the type IV pseudobinary system polypropylene-alcohol. This type of system contains an additional critical locus with upper critical solution temperatures (UCSTs) emanating from an upper critical end point (UCEP). The pseudoternary systems polypropylene-propane-alcohol possess in most cases a merged critical locus which contains a set of UCSTs and lower critical solution temperatures (LCSTs) and which does not touch the vapor pressure curve of the solvent. The phase equilibrium measurements of the system polypropylene-propane were also extended to include some polymers and copolymers which vary in branch length and frequency. The cloud-point pressures of these systems correlate with the wt % carbon in the branches but not with the branch frequency.