Catalytic polymerization process

Details Catalytic polymerization process Catalytic polymerization process

C - Chemistry, Metallurgy

08

F

C08F 220/10 (2006.01) C08F 2/38 (2006.01) C08F 210/06 (2006.01) C08F 214/02 (2006.01) C08F 214/16 (2006.01) C08F 214/18 (2006.01) C08F 218/04 (2006.01) C08F 220/00 (2006.01) C08F 220/44 (2006.01) C08F 220/56 (2006.01) C08F 290/04 (2006.01) C08G 83/00 (2006.01)

Patent

CA 2247837

This invention relates to a process for controlling the architecture of copolymers of at least two unsaturated monomers, made by free-radical polymerization in the presence of a cobalt-containing chain transfer agent, including the control of molecular weight, degree of branching and vinyl end group termination, by varying at least one of the variables of molar ratio of monomers, their relative chain transfer constants, polymerization temperature and degree of conversion and amount of cobalt chain transfer agent; and polymers made thereby.

L'invention concerne un procédé permettant de modifier l'architecture de copolymères d'au moins deux monomères insaturés, ces copolymères étant obtenus par polymérisation par radicaux libres en présence d'un agent de transfert de chaînes contenant du cobalt. On peut modifier le poids moléculaire, le degré de ramification et l'arrêt de la polymérisation au niveau des groupes vinyliques terminaux, en faisant varier au moins une des variables suivantes: rapport molaire des monomères, les constantes de transfert de chaîne relatives de ceux-ci, la température de polymérisation, le degré de conversion et la quantité d'agent de transfert (cobalt). L'invention concerne, également, les polymères obtenus par ce procédé.

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