Random copolymer comprising D-(-)-3-hydroxybutyrate units and D-

Details Random copolymer comprising D-(-)-3-hydroxybutyrate units and D- Random copolymer comprising D-(-)-3-hydroxybutyrate units and D-

1990-06-05

1991-03-05

Kight, III, John

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

435135, 528354, C08G 6306

Patent

active

049979094

ABSTRACT:
A random copolymer comprising less than 50 mole % of D-(-)-3-hydroxybutyrate units and more than 50 mole % of D-(-)-3-hydroxyvalerate units, the percentages being based on the total amount of the two units. A process for producing the random copolymer which comprises (1) cultivating a microorganism having the ability to produce poly(3-hydroxybutyrate) to grow and proliferate the cells of the microorganism, (2) cultivating the cells in the presence of a valeric acid or in the copresence of a valeric acid and an n-butyric acid while limiting the amount of nitrogen or phosphorus to produce and accumulate a random copolymer comprising D-(-)-3-hydroxybutyrate units and D-(-)-3-hydroxyvalerate units within the cells, and thereafter, (3) recovering the copolymer from the cells.

REFERENCES:
Marchessault et al., Macromolecules, 1984, 17, pp. 1882-1884, "Physical Properties of Naturally Occurring Polyester".

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