Production of aliphatic copolyesters
AssigneeMitsubishi Chemical Corporation
InventorsKeiko Miyazaki, Hiroshi Noguchi, Takayuku Ota, Atsushi Kasai, Hiroaki Yamaoka
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Abstract
Aliphatic polyester copolymers, which have molecular weights high enough for practical use and which are excellent in thermal stability, tensile strength and moldability, and which are biodegradable as well, are provided, which are produced by a process comprising effecting polycondensation of an aliphatic diol and an aliphatic dicarboxylic acid in the presence of an aliphatic monohydroxymonocarboxylic acid in a specific amount and of a catalyst comprising a germanium compound.
Claims14
A condensation process for producing an aliphatic copolyester, comprising reacting an aliphatic dicarboxylic acid or a functional derivative thereof with an aliphatic diol in a polyester-producing condensation reaction at a temperature in a range of from 150.degree. C. to 260.degree. C. under a reduced pressure, substantially in the absence of a solvent and in the presence of a catalyst which comprises a germanium compound and of an aliphatic monohydroxymonocarboxylic acid in an amount of 0.04 to 60 mol for 100 mol of the aliphatic dicarboxylic acid so as to obtain an aliphatic copolyester whose number-average molecular weight is at least 10,000.
Dependencies are inferred from the claim text.