| 摘要 |
PURPOSE:To produce the title copolymer advantageously and easily by multiplying an alcaligenes which can produce poly-3-hydroxybutyrate, and then cultivating it in the presence of two specific compounds. CONSTITUTION:An alcaligenes which can produce poly-3-hydroxybutyrate (e.g., Alcaligenes faecalis ATCC8750) is inoculated in an ordinary medium containing sources of carbon and nitrogen, inorganic components, etc., and is cultivated aerobically at a pH of 6-10 and a temperature of 20-40 deg.C to multiply the fungus. Then, the cells are cultivated in a culture broth which is free from N2 and P and contains a compound of formula I (wherein X is H, halogen, or hydroxy; Y is alkyl; n is 1-4; and Z is H or a monovalent-tetravalent metal element) and a compound of formula II (wherein M is hydroxy or halogen; and N is Z) in an amount of 3-40g/l to produce a polyester copolymer comprising 10-90mol.% 3-hydroxybutyrate unit, 3-60mol.% 4-hydroxybutyrate unit, and 5-87mol.% 3-hydroxyvalerate unit and having an intrinsic viscosity of 0.4-10.0dl/g (30 deg.C, in chloroform). |
