Method for manufacturing biodegradable high molecular aliphatic polyester

A method for manufacturing a biodegradable high molecular weight aliphatic polyester comprising the steps of:

• synthesizing an aliphatic polyester having a weight average molecular weight of at least 30,000 by reacting aliphatic or alicyclic glycol with aliphatic dicarboxylic acid or its anhydride, applying a 0.001-0.5 part by weight of organic or inorganic metallic compound as a catalyst with respect to 100 parts by weight of aliphatic polyester to be produced;
• adding a 0.01-3 parts by weight of organic or inorganic phosphorus compound with respect to 100 parts by weight of aliphatic polyester completion of the reaction;
• and
• reacting a 0.1-5 parts by weight of polyfunctional isocyanate compound with 100 parts by weight of the aliphatic polyester so that the polyester has a weight average molecular weight of at least 50,000.

A method for manufacturing a biodegradable high molecular weight aliphatic polyester comprising the steps of:

• synthesizing an aliphatic polyester having a number average molecular weight of at least 5,000 and a weight average molecular weight of at least 30,000 by reacting aliphatic or alicyclic qlycol with aliphatic dicarboxylic acid or its anhydride, applying 0.001-0.5 part by weight of organic or inorganic metallic compound as a catalyst with respect to 100 parts by weight of aliphatic polyester to be produced
• adding a 0.01-3 parts by weight of organic or inorganic phosphorus compound with respect to 100 parts by weight of aliphatic polyester upon completion of the reaction;
• and
• reacting a 0.1-5 parts by weight of polyfunctional isocyanate compound with 100 parts by weight of the aliphatic polyester so that the polyester has a number average molecular weight of at least 10,000 and a weight average molecular weight of at least 50,000.