| abstract |
(57) [Abstract] [Problem] Biodegradability is extremely excellent and high molecular weight, A biodegradable polyester having good moldability and physical properties, and a method for producing the same. A polyvalent hydroxy compound, particularly an aliphatic or cycloaliphatic glycol, and a polyvalent carboxylic acid, particularly an aliphatic or cycloaliphatic dicarboxylic acid or a precursor thereof, as a main component, and an alkyl group as a side chain. A biodegradable aliphatic polyester containing a polyvalent carboxylic acid in an amount of 0.01 to 5 mol% based on the dicarboxylic acid and / or its precursor. And titanium group metal chlorides, oxygen chlorides, Oxygen nitrates of the general formula O = M (RCO 2) 2 carboxylate of the general formula O = M (RC = OCHC = OR) 2 acetylacetone type complex wherein, M is titanium-group metal, R represents a hydrocarbon group The above method for producing a biodegradable polyester, wherein any of the above is used as an ester polymerization catalyst. |