Polyether copolymers and a process for preparing them

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

C08G 65/32 (2006.01) C08G 65/337 (2006.01) C08G 81/00 (2006.01) C08G 83/00 (2006.01)

Patent

CA 2207589

A block copolymer containing one or more polyoxyethylene blocks and one or more polyoxy(higher alkylene) blocks wherein at least some of the blocks are linked together by an oxymethylene group can be prepared by reacting one or more dihydroxy terminated polymers selected from polyethylene glycol), poly(higher alkylene glycol) and block copolymers thereof in solution with a dihalomethane in the presence of a base. Such copolymers can be used as surfactants and surface modifiers.

L'invention concerne un copolymère séquencé contenant une ou plusieurs séquences polyoxyéthylène et une ou plusieurs séquences polyoxy(alkylène supérieur), dans lequel au moins certaines des séquences sont liées entre elles par un groupe oxyméthylène. Ce copolymère séquencé peut être préparé par réaction d'un ou de plusieurs polymères à terminaison dihydroxy choisis parmi le poly(éthylène glycol), le poly(glycol alkylène supérieur) et leurs copolymères séquencés, dans une solution avec un dihalométhane en présence d'une base. Ces copolymères s'utilisent comme tensioactifs et modificateurs de surface.

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