Star polymers made from macromonomers made by cobalt chain...

C - Chemistry – Metallurgy – 08 – F

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C08F 299/00 (2006.01) C08L 53/00 (2006.01)

Patent

CA 2181234

A polymer dispersion of a star polymer dispersed in an organic liquid; wherein the star polymer has a cross-linked core having attached thereto at least three macromonomer arms; where (1) the core is formed of monomers having at least two ethylenically unsaturated double bonds which are cross-linked with each other and the core has at least 3 free radical polymerizable sites each of which are reacted with the macromonomer; and (2) the macromonomer that forms the arms of the star polymer is formed of ethylenically unsaturated monomers that have been polymerized by free radical polymerization in the presence of a free radical polymerization initiator and a catalytic chain transfer agent containing Co+2 to provide the macromonomer with a terminal ethylenically unsaturated group that is polymerized with the free radical polymerizable site on the core to form the star polymer. The process for making the star polymer and coating compositions that utilize the star polymer are also part of this invention.

L'invention concerne une dispersion d'un polymère en étoile dispersé dans un liquide organique. Ce polymère en étoile a un noyau réticulé sur lequel sont greffées au moins trois branches macromonomères. Dans ce polymère: (1) le noyau est constitué à partir de monomères ayant au moins deux doubles liaisons éthyléniquement insaturées, formant un réseau réticulé, et il a au moins trois sites disponibles pour une réaction radicalaire, permettant de greffer les macromonomères; et (2) les macromonomères qui constituent les branches du polymère en étoile sont formés à partir de monomères éthyléniquement insaturés, polymérisés par un processus radicalaire en présence d'un initiateur de polymérisation radicalaire et d'un agent catalytique de transfert de chaîne contenant du Co?2+¿, ce qui permet d'obtenir des macromonomères avec un groupe terminal éthyléniquement insaturé. On greffe ces macromonomères sur le site de greffage du noyau par un processus radicalaire, pour former le polymère en étoile. Le procédé de préparation du polymère en étoile et les compositions de revêtement contenant ce polymère en étoile font également partie de cette invention.

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