Environment responsive gelling copolymer

C - Chemistry – Metallurgy – 08 – F

Patent

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Details

C08F 283/06 (2006.01) A61L 27/16 (2006.01) A61L 27/50 (2006.01) A61L 27/52 (2006.01) A61L 27/54 (2006.01) A61L 27/58 (2006.01) C08J 3/075 (2006.01) C08L 53/00 (2006.01)

Patent

CA 2402546

The invention relates to a gelable copolymer composition comprising a copolymer in a solvent. The copolymer has the structure A(B)n, wherein the core (A) is soluble in the solvent, the arms (B) are convertible between soluble and insoluble in the solent depending on an environmental condition, and n > 1. The composition forms a gel under environmental conditions in which B is insoluble, through formation of B aggregates. Block copolymers comprising polyethylene glycol (PEG) and poly (N-iso-propylacrylamide) (PNIPAAm) having a liquid form at ambient temperature under aqueous conditions and a gel form at body temperature are disclosed. Copolymer compositions according to the invention can be used to formin situ implants useful in slow-release formulations of biologically active molecules. Image

La présente invention concerne une composition de copolymère pouvant se gélifier qui comprend un copolymère dans un solvant. Le copolymère présente la structure A(B)n, dans laquelle le noyau (A) est soluble dans le solvant, les branches (B) pouvant passer de l'état soluble à l'état insoluble dans le solvant en fonction d'une condition environnementale et n > 1. La composition forme un gel dans des conditions environnementales dans lesquelles B est insoluble, par formation d'agrégats B. Des copolymères séquencés comprenant du polyéthylène glycol (PEG) et du poly(N-isopropylacrylamide) (PNIPAAm) ayant une forme liquide à température ambiante dans des conditions aqueuses et une forme gel à température corporelle sont présentés. Des compositions de copolymère selon la présente invention peuvent être utilisées pour former des implants <i>in situ </i>utiles dans des formulations à libération lente de molécules biologiquement actives.

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