Process for preparing comb-branched polymers

Details Process for preparing comb-branched polymers Process for preparing comb-branched polymers

C - Chemistry, Metallurgy

08

F

C08F 220/64 (2006.01) C08F 2/06 (2006.01) C08F 265/02 (2006.01) C08F 265/04 (2006.01) C08F 265/06 (2006.01) C08F 267/02 (2006.01) C08F 290/06 (2006.01)

Patent

CA 2377463

A continuous process for making a comb-branched copolymer of an acrylic monomer and a polyether macromonomer is disclosed. The process is performed by continuously feeding a reaction zone with a monomer stream that contains an acrylic acid and a polyether macronomer, and an initiator stream. The comb-branched copolymer made thereby performs better as water reducing agent in cement compared to that made by a batch process.

L'invention concerne un procédé continu de préparation d'un polymère ramifié en peigne à partir d'un monomère acrylique et d'un macromonomère polyéther. On met ce procédé en oeuvre en alimentant une zone de réaction de manière continue avec un courant monomère contenant un acide acrylique et un macromonomère polyéther, et avec un courant amorceur. Le copolymère ramifié en peigne résultant constitue un meilleur agent réducteur d'eau pour ciment que celui obtenu avec un procédé discontinu.

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