Method for preparing halogenated copolymers, resulting...

C - Chemistry – Metallurgy – 08 – F

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C08F 214/00 (2006.01) C08F 214/08 (2006.01)

Patent

CA 2353881

The invention concerns a method for preparing halogenated copolymers by copolymerising at least two monomers, whereby copolymerisation is carried out in an aqueous dispersion, on the intervention of a primer whereof a fraction is introduced in the polymerisation charge and the introduction of the other fraction is delayed. The resulting halogenated copolymers are copolymers with a melting temperature determined by differential thermoanalysis not more than 140 ·C and a relative viscosity, measured at a concentration of 10 g/l in tetrahydrofurane, not less than 1.30. Said copolymers can be used for making extruded articles.

Procédé pour la préparation de copolymères halogénés par copolymérisation d'au moins deux monomères, selon lequel la copolymérisation s'effectue en dispersion aqueuse, à l'intervention d'un initiateur dont une fraction est introduite dans la charge de polymérisation et l'autre fraction est introduite en différé. Les copolymères halogénés obtenus sont des copolymères présentant une température de fusion déterminée par analyse thermique différentielle inférieure ou égale à 140 ~C et une viscosité relative, mesurée à une concentration de 10 g/l dans le tétrahydrofurane, supérieure ou égale à 1,30. Ces copolymères peuvent être utilisés pour la réalisation d'articles extrudés.

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