Radiation curable resins comprising hyperbranched polyesters

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

C08G 63/20 (2006.01) C08G 63/127 (2006.01) C08G 63/21 (2006.01) C08G 63/58 (2006.01) C08G 63/78 (2006.01) C08G 83/00 (2006.01) C08J 3/28 (2006.01)

Patent

CA 2198755

Hyperbranched polyester of a polyol with 3 to 10 reactive hydroxyl groups, preferably of equivalent reactivity, and an aromatic polycarboxylic anhydride with 2 to 4 carboxyl groups, preferably 3 carboxyl groups, each hydroxyl group of the polyol forming an ester linkage with one anhydride group of the polycarboxylic anhydride, and further glycidyl (meth)acrylate or allyl glycidyl ether forming ester linkages with the remaining carboxyl groups of the anhydride and free hydroxyl groups. Further in the hyperbranched polyester (meth)acrylic anhydride and/or an aliphatic carboxylic anhydride form ester linkages with the free hydroxyl groups. The invention also comprises a process for the production of hyperbranched polyesters and such polyesters obtainable by the process. The hyperbranched polyesters can be used as resins, curable by UV irradiation, for the production of coatings, adhesives, laminates, foils and thin films and fibre-reinforced composites.

Polyester hyperramifié d'un polyol comportant 3 à 10 groupes hydroxyle réactifs, de préférence de réactivité équivalente, et un anhydride polycarboxylique aromatique comportant 2 à 4 groupes carboxyle, de préférence 3 groupes carboxyle; chaque groupe hydroxyle du polyol forme une liaison ester avec un groupe anhydride de l'anhydride polycarboxylique. En outre, un (meth)acrylate ou un allyle glycidyle éther forme des liaisons ester avec les groupes carboxyle restants des groupes anhydride et des groupes hydroxyle libres. De plus, dans ce polyester hyperramifié, l'anhydride (meth)acrylique et/ou un anhydride carboxylique aliphatique forment des liaisons ester avec les groupes hydroxyle libres. L'invention porte également sur un procédé d'élaboration de polyesters hyperramifiés et sur les polyesters obtenus selon ce procédé. Ces polyesters hyperramifiés peuvent être utilisés comme résines durcissables sous rayonnement ultraviolet, pour l'obtention de revêtements, d'adhésifs, de stratifiés, de feuilles et de couches minces ainsi que de composites renforcés par des fibres.

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