Hydroxy-terminated polyhydroxyalkanoates

Details Hydroxy-terminated polyhydroxyalkanoates Hydroxy-terminated polyhydroxyalkanoates

1998-06-12

2000-12-05

Pezzuto, Helen L.

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525437, 525444, 528361, 435135, 435141, C08F 2000

Patent

active

06156852&

ABSTRACT:
Hydroxyterminated PHA is produced by cultivating a PHA-producing microorganism in the presence of an aliphatic diol or an aliphatic polyol. High molecular weight hydroxy-terminated PHA is obtainable by the disclosed process, and is useful in the production of graft, block and random polymers and copolymers with other monomers, oligomers and polymers containing appropriate functionality and end group compatibility. The hydroxyterminated PHAs of the invention display improved thermal stability compared with PHAs not modified to contain increased end-group hydroxyl content. In addition, a branched PHA structure is provided by melt processing polyol terminated PHA.

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Hirt, Thomas D. et al. (1996) "Telechelic diols from poly[(R)-3-hydroxybutyric acid] and poly{[(R)-3-hydroxybutyric acid]-co-[(R)-3-hydroxyvaleric acid]}, " Macromol. Chem. Phys. 197:1609-1614.
Shi, Fengying et al. (1996) "Use of Poly(ethylene glycol)s To Regulate Poly(3-hydroxybutyrate) Molecular Weight dueing Alcaligenes eutrophus Cultivations," Macromolecules 29:7753-7758.
Grassie, N. et al. (1984) "The Thermal Degradation of Poly(-D)-.beta.-Hydroxybutyric Acid): Part 3--The Reachtion Mechanism," Polymer Degradation and Stability 6:127-134.

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