3-HYDROXYBUTYRATE POLYMERS

专利名称：3-HYDROXYBUTYRATE POLYMERS发明人：PAUL ARTHUR HOLMES,STEPHEN HUGH

COLLINS,LEONARD FREDERICK WRIGHT

申请号：AU8410882申请日：19820524公开号：AU560653B2公开日：19870416

摘要：High molecular weight copolymers containing 3-hydroxybutyrate residues, i.e.units of the formula -O.CH(CH3).CH2.CO- and up to 50 mole % of residues of otherhydroxy acids, viz units of the formula -O.CR<1>R<2>.(CR<3>R<4>)n.CO- where n is 0 oran integer and, if n = 1 and R<2>, R<3>, and R<4> = H, R<1> is not methyl. The

copolymers are made microbiologically: for part of the cultivation the micro-organism isunder 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 ofthis period of polymer accumulation the substrate is an acid or a derivative thereof thatgives the comonomer units. Propionic acid, which gives polymers where n = 1,R<2>=R<3>=R<4>=H and R<1> = C2H5, is the preferred acid.

申请人：IMPERIAL CHEMICAL INDUSTRIES PLC

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