Aliphatic polyester composition

C - Chemistry – Metallurgy – 08 – L

Patent

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Details

C08L 67/00 (2006.01) C08K 5/00 (2006.01) C08K 5/17 (2006.01) C12P 7/62 (2006.01)

Patent

CA 2192688

A polymer composition comprises an aliphatic polyester and at least one compound of the general formula (I): R1a (A) R2b, where A is a polyfunctional hydrocarbon group; R1 is an electron-donating group such as hydroxy, amino, thiol or a derivative thereof; R2 is an electron-withdrawing group such as carboxylic acid, carboxylic amide and quaternary onium; and a and b are at least 1. Preferably the compound is an .alpha.-amino carboxylic acid especially with at least one group R1 additional to the carboxylic and .alpha.- amino group, or is a phosphatidyl choline. Preferably the polyester is capable of over 30 % crystallinity in the absence of plasticiser and is an (R)- stereospecific polyhydroxyalkanoate product of microbiological fermentation, containing less than 2000 ppm w/w of nitrogen as N.

Une composition polymère comprend un polyester aliphatique et au moins un composé ayant la formule générale (I) R?1¿¿a? (A) R?2¿¿b? dans laquelle A représente un groupe hydrocarbure polyfonctionnel; R?1¿ représente un groupe donneur d'électrons tels qu'hydroxyle, amine, thiol ou un de leurs dérivés; R?2¿ représente un groupe attracteur d'électrons tels qu'un acide carboxylique, un amide carboxylique et un onium quaternaire; et a et b valent au moins 1. De préférence, ce composé est un acide .alpha.-aminocarboxylique ayant spécialement au moins un groupe R¿1? en plus du groupe carboxylique et .alpha.-amine, ou est une phosphatidylcholine. De préférence, le polyester peut se cristalliser à plus de 30 % en l'absence d'un plastifiant et est constitué d'un produit polyhydroxyalcanoate stéréospécifique par rapport à (R) de fermentation microbiologique contenant moins de 2000 ppm en poids d'azote comme N.

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