3-hydroxybutyrate polymers

Details 3-hydroxybutyrate polymers 3-hydroxybutyrate polymers

C - Chemistry, Metallurgy

08

G

402/314, 195/86

C08G 63/06 (2006.01) C12P 7/62 (2006.01)

Patent

CA 1223687

Abstract 3-hydroxybutyrate polymers High molecular weight copolymers containing 3-hydroxybutyrate residues, i.e. units of the formaula -O.CH(CH3).CH2.CO- and up to 50 mole % of residues of other hydroxy acids, viz units of the formula -0.CR1R2.(CR3R4)n.CO- where n is 0 or an integer and, if n = 1 and R3, H3, and R4 = H,R1 is not methyl. The copolymers are made microbiologically: for part of the cultivation the micro-organism is under conditions such that polymer is accumulated, e.g. by limitation of a nutrient, e.g. nitrogen source, required for growth but not polyester accumulation. For at least part of this period of polymer accumation the substrate is an acid or a derivative thereof that gives the comonomer units. Propionic acid, which gives polymers where n = 1, R2=R3=R4=H and R1 = C2H5, is the preferred acid.

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