Synthesis of terminally unsaturated oligomers

Details Synthesis of terminally unsaturated oligomers Synthesis of terminally unsaturated oligomers

C - Chemistry, Metallurgy

08

F

C08F 2/38 (2006.01)

Patent

CA 2218348

This invention relates to a method for preparing compositions comprising terminally unsaturated polymers of low molecular weight, referred to as oligomers or macromonomers. In particular, a first oligomer composition is obtained by free radical polymerization of a reaction mixture comprising monomers. Terminally unsaturated oligomers in the first oligomer composition, or a selected portion of the composition, are reinitiated into free radicals in order to continue their oligomerization to a desired endpoint. The process is useful for preparing an oligomer composition having a controlled degree of polymerization. The process is also useful for preparing block copolymers. Such oligomer compositions or block polymers are useful for preparing engineered or structured polymers used in making various end products, including plastics, coatings, films, and dispersants.

Procédé d'élaboration de compositions renfermant des polymères de faible poids moléculaire insaturés au niveau de leur terminaison, appelés oligomères ou macromonomères. Une première composition oligomère, en particulier, est obtenue par polymérisation radicalaire d'un mélange réactif renfermant des monomères. Les oligomères insaturés au niveau de leur terminaison dans la première composition oligomère, ou une certaine partie de cette composition, sont réinitiés sous forme de radicaux libres afin de poursuivre leur oligomérisation jusqu'au point final souhaité. Ce procédé sert à élaborer une composition oligomère présentant un degré controlé de polymérisation. Il sert également à élaborer des copolymères blocs. De telles compositions oligomères ou de tels copolymères blocs servent à l'élaboration de polymères organisés ou structurés, utilisés dans divers produits finaux, dont les matières plastiques, les revêtements, les films et les agents de dispersion.

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