Beta-hydroxybutyrate polymers

摘要: High molecular weight copolymers containing β-hydroxybutyric acid residue, i.e. units of the formula and up to 50 mole % residues other hydroxy acids, viz where n is 0 or 1 and, if = R 2 , 3 4 H, not methyl. The are made microbiologically: for part cultivation micro-organism under conditions limitation a nutrient, e.g. nitrogen source, required growth but polyester accumulation. For at least this period substrate an salt thereof that tives comonomer units. Propionic acid, which gives polymers 1, =R =H C H preferred acid.