Process for obtaining hydrophilic polymers at a high rate of...

C - Chemistry – Metallurgy – 08 – F

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402/397

C08F 2/32 (2006.01)

Patent

CA 2219192

The invention concerns an inverse suspension hydrophilic monomer polymerization process in the presence of a surfactant whose hydrophilic balance ranges from 8 to 12, including an initial polymerization stage with phase inversion, and a second polymerization stage with phase inversion, and then a second stage during which a second monomer charge is introduced into the reactor at the monomer polymerization temperature. This process allows much higher aqueous phase to organic phase volumetric ratios (RASO) than the best RASO of conventional practices (~0.6), in practice from 0.6 to 1.2. Productivity is considerably improved without the quality of the hydrophilic powders being altered. It is surprising to see that the "raspberry" quality of the final powder obtained is not affected in the least, that its specific surface is not reduced, and that its granulometric distribution remains between 100 and 800 µm.

L'invention concerne un procédé de polymérisation de monomères hydrophiles en suspension inverse en présence d'un tensioactif dont la balance hydrolipophile est comprise entre 8 et 12, comprenant une première étape de polymérisation avec inversion de phase, puis une seconde étape polymérisation avec inversion de phase, puis une seconde étape au cours de laquelle une deuxième charge de monomère est introduite dans le réacteur à la température de polymérisation du monomère. Ce procédé permet de réaliser des venues avec des rapports volumétrique phase aqueuse sur phase organique ("RASO") très supérieurs aux meilleurs "RASO" des procédés classique (~0,6), en pratique de 0,6 à 1,2. La productivité est considérablement améliorée sans que la qualité des poudres hydrophiles soit altérée. Il est très surprenant de constater que la morphologie "framboise" de la poudre finale obtenue n'est pas du tout affectée, que sa surface spécifique n'est pas diminuée, et que sa distribtion granulométrique reste située entre 100 et 800 µm.

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