Patent ID: 7138179

Claim:
A method for preparing a biodegradable polyester, comprising the steps of: dispersing a monomer in the presence of a catalyst in a dispersion solvent to form a solid or liquid phase for dispersion polymerization and yielding a biodegradable aliphatic polyester in the form of spherical particles or powder, the monomer comprising a mixture of a compound (A) represented by the following formula I and a compound (B) being selected from the group consisting of compounds represented by the following formulas II to V and caprolactones: wherein R1 and R2 are a hydrogen or a C 1 –C 4 alkyl group; HO—C(═O)—(CH 2 ) n —(O═)C—OH [Formula II] wherein n is 1 to 8; H—O—(CH 2 ) m —O—H [Formula III] wherein m is 2 to 8; R 3 (OH) x [Formula IV] wherein x is 2 to 6; and R3 is a saturated C 1 –C 8 hydrocarbon or an ether (—R—O—R—); and H—O—{(CH 2 CH 2 ) y O} z —H. [Formula V]