Biodegradable and hydrodegradable diblock copolymers composed of

Details Biodegradable and hydrodegradable diblock copolymers composed of Biodegradable and hydrodegradable diblock copolymers composed of

1993-07-28

1995-08-08

Short, Patricia A.

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

Synthetic resins

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

525415, 525450, 528354, 528359, 528360, C08G 6308, C08G 6384

Patent

active

054399858

ABSTRACT:
A biodegradable and hydrodegradable diblock copolymer includes a naturally-occurring poly(.beta.-alkanoate) component and a chemically synthesized polyester component formed by ring-opening polymerization. A method of forming the biodegradable and hydrodegradable diblock copolymer having a poly(.beta.-hydroxyalkanoate) component and a chemically synthesized polyester component includes exposing a naturally-occurring poly(.beta.-hydroxyalkanoate) to alcoholysis and then to a trialkyl metal to form a dialkyl metal poly(.beta.-hydroxyalkanoate) macroinitiator. The macroinitiator is then reacted with a lactone or lactide reactant to form the biodegradable and hydrodegradable diblock copolymer.

REFERENCES:
patent: 5124371 (1992-06-01), Tokiwa
Reeve, M. S., McCarthy, S. P., and Gross, R. A., "Preparation and Characterization of PHB-PCL and PHB-PLA," Macromolecules, 26(5):888-894 (1993).
Jacobs, C., Dubois, Ph., Jerome, R., and Teyssie Ph., "Macromolecular Engineering of Polylactones and Polylactides. 5. Synthesis and Characterization of Diblock Copolymers Based on Poly-e-caprolactone and Poly (L,L or D,L) lactide by Aluminum Alkoxides," Macromolecules, 24(11):3027-3034 (1991).
Dubois, Ph., Jacobs, C., Je me, R., and Teyssie, Ph., "Macromolecular Engineering of Polylactones and Polylactides. 4. Mechanism and Kinetics of Lactide Homopolymerization by Aluminum Isopropoxide," Macromolecules, 24(9):2266-2270 (1991).
Reeve, M. S., McCarthy, S. P., and Gross, R. A., "Polymeric Materials", Science and Engineering, 67:182-184 (1992).
Reeve, M. S., McCarthy, Stephen, and Gross, R. A., "The Chemical Degradation of Bacterial Polyesters for Use in the Preparation of New Degradable Block Copolymers", Polymeric Preprints, pp. 437-438 (1991, Apr.).

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