Thermosetting compositions containing carboxylic acid...

C - Chemistry – Metallurgy – 08 – L

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C08L 57/00 (2006.01) C08L 63/00 (2006.01) C09D 5/03 (2006.01) C09D 133/02 (2006.01) C09D 133/06 (2006.01)

Patent

CA 2340373

A thermosetting composition comprising a co-reactable solid, particulate mixture of (a) polycarboxylic acid functional polymer, and (b) epoxide functional cross-linking agent having at least two epoxide groups, e.g., triglycidyl isocyanurate (TGIC), is described. The polycarboxylic acid functional polymer is prepared by atom transfer radical polymerization and has well defined polymer chain architecture and polydispersity index of less than 2Ø The thermosetting compositions of the present invention have utility as powder coatings compositions.

La présente invention concerne une composition thermodurcissable comprenant un solide co-réagissant, mélange particulaire (a) d'un polymère polycarboxylique fonctionnel et (b) d'un agent de réticulation fonctionnel contenant aux moins deux groupes époxyde, par exemple du triglycidyl isocyanurate (TGIC). Le polymère polycarboxylique fonctionnel est préparé par polymérisation radicalaire à transfert d'atome et présente une chaîne polymérique d'architecture bien définie et un indice de polydispersité inférieur à 2,0. Les compositions thermodurcissables de la présente invention sont utilisées comme poudres de revêtement.

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