Poly(ester-anhydrides) and intermediates therefor

Details Poly(ester-anhydrides) and intermediates therefor Poly(ester-anhydrides) and intermediates therefor

C - Chemistry, Metallurgy

08

G

C08G 63/91 (2006.01) C08G 63/08 (2006.01) C08G 63/692 (2006.01) C08G 67/04 (2006.01)

Patent

CA 2233653

Biodegradable poly(ester-anhydrides) designed to display two-stage degradation profiles are described. The presence of the anhydride linkages allows a relatively rapid decrease in molecular weight, the extend of which is governed by the concentration of the anhydride linkages along the chain, followed by possible dissolution and a slower degradation of the remaining oligomers, the rate of which is governed by the composition of the polyester prepolymers. Methods for the preparation of the poly(ester-anhydrides) and their polyester precursors are also described.

L'invention concerne des poly(ester-anhydrides) biodégradables conçus de façon à présenter des profils de dégradation en deux phases. La présence de liaisons anhydrides permet une réduction relativement rapide du poids moléculaire dont l'importance dépend de la concentration de liaisons anhydrides le long de la chaîne; cela entraîne également une éventuelle dissolution et une plus lente dégradation des oligomères restants dont le taux est régulé par la composition de prépolymères polyesters. L'invention concerne également des procédés de préparation des poly(ester-anhydrides) et de leurs précurseurs polyesters.

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