Method to control atom transfer radical polymerization

C - Chemistry – Metallurgy – 08 – F

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C08F 2/00 (2006.01) C08F 4/00 (2006.01)

Patent

CA 2333926

A polymerization method characterized by conducting the atomic-transfer radical polymerization of a vinyl monomer so as to satisfy at least one requirement selected from the group consisting of the following (1), (2), (3), and (4): (1) the polymerization is conducted under substantially dehydrating conditions; (2) the polymerization is conducted in the presence of a nitrile compound; (3) the polymerization is initiated by adding a ligand for a polymerization catalyst to the system; and (4) the rate of polymerization is controlled by changing the activity of the polymerization catalyst during polymerization. Thus, an easy and safe method for initiating the atomic- transfer radical polymerization and a method for controlling the polymerization rate are provided which are effective in enabling a large proportion of terminal halogen-containing groups to remain and in eliminating problems such as the difficult control of polymerization rate due to catalyst sedimentation or a change in catalyst amount. Improvements in the polymerization are suggested.

Procédé de polymérisation caractérisé par l'exécution d'une polymérisation radicalaire à transfert atomique d'un monomère vinylique afin de satisfaire au moins une condition choisie dans le groupe des conditions suivantes (1), (2), (3) et (4): (1) la polymérisation est exécutée dans des conditions de déshydratation; (2) la polymérisation est exécutée en la présence d'un composé de nitrile; (3) la polymérisation est amorcée par addition au système d'un ligand pour un catalyseur de polymérisation; (4) la vitesse de polymérisation est régulée par changement de l'activité du catalyseur de polymérisation pendant la polymérisation. Ainsi, on obtient un procédé sans danger d'amorce de polymérisation radicalaire à transfert atomique et un procédé de régulation de la vitesse de polymérisation, lesquels permettent de conserver une grande proportion de groupes terminaux contenant de l'halogène et d'éliminer les problèmes tels que la difficile régulation de la vitesse de polymérisation due à la sédimentation du catalyseur ou à un changement de la quantité du catalyseur. Des améliorations apportées à la polymérisation sont suggérées.

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