Degradable hydrophilic block copolymers with improved...

C - Chemistry – Metallurgy – 08 – G

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C08G 63/664 (2006.01) A61L 15/26 (2006.01) A61L 27/18 (2006.01) A61L 27/56 (2006.01) C08G 81/00 (2006.01) C08J 9/00 (2006.01) C08J 9/28 (2006.01)

Patent

CA 2645153

The present application discloses biodegradable polymers, to porous and other materials comprising such polymers, and to various medical uses of such materials, including use as a scaffold for supporting cell adhesion or the in-growth for regeneration of tissue. The polymer is of the formula A-O-(CHR1CHR2O)n-B wherein A is a poly(lactide-co-glycolide) residue, the molar ratio of (i) lactide units [-CH(CH3)-COO-] and (ii) glycolide units [-CH2-COO-] in the poly(lactide-co-glycolide) residue being in the range of 80:20 to 10:90, B is either a poly(lactide-co-glycolide) residue or hydrogen, C1-6-alkyl or hydroxy protecting groups, one of R1 and R2 is hydrogen or methyl, and the other is hydrogen, n is 10-1000, the molar ratio of (iii) polyalkylene glycol units [-(CHR1CHR2O)-] to the combined amount of (i) lactide units and (ii) glycolide units in the poly(lactide-co-glycolide) residue(s) is at the most 14:86, and the molecular weight of the copolymer is at least 20,000 g/mol.

La présente demande concerne des polymères biodégradables, sur des matériaux poreux, etc., comprenant de tels polymères, et sur diverses applications médicales de tels matériaux, y compris sous forme de support pour l'adhésion de cellules ou pour la régénération des tissus. Le polymère est de formule A-O-(CHR1CHR2O)n-B où A est un résidu poly(lactide-co-glycolide), le rapport molaire des motifs (i) lactide [-CH(CH3)-COO-] sur (ii) les motifs glycolide [-CH2-COO-] dans le résidu poly(lactide-co-glycolide) étant compris entre 80 : 20 et 10 : 90, B est un résidu poly(lactide-co-glycolide) ou un atome d'hydrogène, un groupement alkyle en C1-6 ou un groupement protecteur de fonction hydroxy, l'un des groupements R1 et R2 représente un atome d'hydrogène ou un groupement méthyle, et l'autre représente un atome d'hydrogène, n est compris entre 10 et 1000, le rapport molaire des motifs (iii) polyalkylènes glycol [-(CHR1CHR2O)-] sur le total des motifs (i) lactide et (ii) glycolide au sein du ou des résidus poly(lactide-co-glycolide) étant au maximum égal à 14 : 86, et la masse moléculaire du copolymère étant au moins égale à 20 000 g/mol.

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