Patent ID: 6913826

Claim:
A method for preparing polyester polymer in a particle form comprising: adding one or more cyclic monomer in a high pressure reactor; adding an organic metal catalyst or acid catalyst and an initiator; and pressurizing and injecting a compressed gas solvent selected from the group consisting of HFC-23, HFC-32, HFC-152a, HFC-143a, HFC-134a, HFC-125, HFC-227ea, HFC-236fa, HFC-245fa, HFC-254cb, SF 6 , HFC-4-10-mee, C-318 (perfluoro cyclobutane), HCFC-22, HCFC-141b, HCFC-142b, HCFC-225ca/cb, dimethylether, N 2 O, propane, butane and their mixtures, or their mixtures with CO 2 , to solution-polymerize the monomer.