Polycarbonate block copolymers

C - Chemistry – Metallurgy – 08 – G

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Details

C08G 64/02 (2006.01) C08G 64/18 (2006.01) C09K 8/588 (2006.01)

Patent

CA 2742119

The disclosure pertains to amphiphilic block copolymers comprising an aliphatic polycarbonate chain coupled to a hydrophilic polymer. Such amphiphilic polymers may have the formula A-L-B, where A-is a polycarbonate or polyethercarbonate chain having from about 3 to about 500 repeating units, L is a linker moiety and -B is a hydrophilic oligomer having from about 4 to about 200 repeating units. Provided copolymers are useful as surfactants capable of emulsifying aqueous solutions and super-critical carbon dioxide. Provided copolymers also have utility as additives for use in enhanced oil recovery methods.

L'invention porte sur des copolymères à bloc amphiphiles comprenant une chaîne de polycarbonate aliphatique couplée à un polymère hydrophile. De tels polymères amphiphiles peuvent avoir la formule A-L-B, où A est une chaîne de polycarbonate ou de polyéthercarbonate ayant d'environ 3 à environ 500 unités répétitives, L est une fraction liante et B est un oligomère hydrophile ayant d'environ 4 à environ 200 unités répétitives. Les copolymères de l'invention sont utiles comme agents tensioactifs capables d'émulsifier des solutions aqueuses et du dioxyde de carbone supercritique. Les copolymères de l'invention ont également une utilité comme additifs pour une utilisation dans des procédés améliorés de récupération d'huile.

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