Liquid, radiation-curable composition, especially for...

G - Physics – 03 – C

Patent

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Details

G03C 9/08 (2006.01) G03F 7/00 (2006.01) G03F 7/027 (2006.01) G03F 7/038 (2006.01)

Patent

CA 2326128

The present invention relates to stereolithographic compositions containing an actinic radiation-curable and cationically polymerizable organic substance, a cationic initiator, a radical photoinitiator, and at least one cationic reactive modifier containing at least two reactive groups per molecule or at least one polyether polyol or mixtures thereof. The cationic reactive modifier has at least one chain extension segment with a molecular weight of at least about 100 and not more than about 2,000. The polyether polyol has a molecular weight greater than or equal to about 4,000. The use of the cationically reactive modifiers and polyether polyol modifiers substantially increases the fexibility and toughness of the cured articles without compromising photospeed, accuracy and wetting-recoatability of the compositions. The present invention further relates to a method of producing a cured product, particularly three-dimensional shaped articles by treating the composition described above with actinic radiation.

La présente invention se rapporte à des compositions stéréolithographiques qui contiennent une substance organique à durcissement par rayonnement actinique et polymérisable par cations, un initiateur cationique, un photo-initiateur radicalaire et au moins un modificateur réactif cationique qui comporte au moins deux groupes réactifs par molécule ou au moins un polyol de polyéther ou ses mélanges. Le modificateur réactif cationique possède au moins un segment d'extension de chaîne dont le poids moléculaire est compris entre environ 100 au minimum et environ 2000 au maximum. Le polyol de polyéther possède un poids moléculaire supérieur ou égal à environ 4000. L'utilisation de modificateurs réactifs cationiques et de modificateurs de polyol de polyéther augmente sensiblement la souplesse et la rigidité des articles durcis, et ce sans affecter négativement la vitesse photo, la précision et la capacité de recouvrement des compositions à l'état humide. La présente invention concerne également un procédé pour fabriquer un produit durci, notamment des articles formés en trois dimensions, qui consiste à traiter la composition ci-décrite par rayonnement actinique.

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