Thermosensitive polymers and thermoreversible gels obtained...

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

C08G 65/333 (2006.01) A61K 9/00 (2006.01) A61K 47/34 (2006.01) C08G 18/08 (2006.01) C08G 18/10 (2006.01) C08G 18/28 (2006.01) C08G 18/32 (2006.01) C08G 18/34 (2006.01) C08G 18/48 (2006.01) C08G 18/66 (2006.01) C08G 18/75 (2006.01) C08G 18/80 (2006.01)

Patent

CA 2489828

The invention concerns water-soluble heat-sensitive polymers comprising both chain formations including at least one heat-sensitive three-block polyoxyalkylene linear chain consisting of polyethylene oxide (POE) blocks and polypropylene oxide (PPO) blocks, said chain being in the form POE-PPO-PPO-POE and being extended to at least one of its ends by an organic group via a carbamate bond and chain formations including at least a three-block polyoxyalkylene POE-PPO-POE linear chain extended to at least one of its ends by an organic group via a urea bond. The invention also concerns heat- reversible physical gels with high viscosification index, containing said polymers and their uses. The invention further concerns preparation of said polymers and said gels.

L'invention concerne des polymères thermosensibles hydrosolubles comprenant à la fois des enchaînements comprenant au moins une chaîne linéaire de type polyoxyalkylène triblocs thermosensible constituée de blocs de polyoxyde d'éthylène (POE) et de blocs de polyoxyde de propylène (PPO), ladite chaîne étant de la forme POE-PPO-POE et étant allongée à au moins une de ses extrémités par un groupement organique via une liaison carbamate et des enchaînements comprenant au moins une chaîne linéaire de type polyoxyalkylène triblocs POE-PPO-POE allongée à au moins une de ses extrémités par un groupement organique via une liaison urée. Elle concerne également des gels physiques thermoréversibles à haut indice de viscosification, contenant ces polymères et leurs utilisations. Elle concerne également la préparation de ces polymères et de ces gels.

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