Block copolymer surfactants prepared by stabilized...

C - Chemistry – Metallurgy – 08 – F

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C08F 297/00 (2006.01) C08F 293/00 (2006.01)

Patent

CA 2241065

A block copolymer of a hydrophobic block of one or more hydrophobic monomers and a hydrophilic block of one or more hydrophilic monomers is prepared by polymerizing a hydrophobic monomer to prepare the hydrophobic block, using a free radical polymerization process using a stable free radical agent, preserving a stabilized active polymerization site on the hydrophobic block; adding a hydrophilic monomer to the stabilized active hydrophobic block; and further reacting the mixture to effect polymerization of the hydrophilic monomer. The polymerization of the hydrophilic monomer is conducted in an amidic solvent in which the hydrophobic block and the hydrophilic monomer are soluble.

Divulgation d'un copolymère séquencé comportant un bloc hydrophobe d'un ou plusieurs monomères hydrophobes et un bloc hydrophile d'un ou plusieurs monomères hydrophiles, produit par polymérisation d'un monomère hydrophobe à l'aide d'un procédé de polymérisation par un agent radicalaire libre stable, afin de préparer le bloc hydrophobe sur lequel est préservé un site actif de polymérisation stabilisé; par l'addition d'un monomère hydrophile sur le bloc hydrophobe actif stabilisé; et par la réaction de ce mélange afin de réaliser la polymérisation du monomère hydrophile. La polymérisation du monomère hydrophile est réalisée dans un solvant amidé dans lequel le bloc hydrophobe et le monomère hydrophile sont solubles.

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