Photocurable compositions containing reactive particles

G - Physics – 03 – F

Patent

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Details

G03F 7/00 (2006.01) G03F 7/032 (2006.01) G03F 7/033 (2006.01) G03F 7/038 (2006.01) G03F 7/075 (2006.01)

Patent

CA 2481301

A photocurable composition, including (a) a photocurable monomer, e.g. a cationically curable monomer and/or a radically curable monomer; (b) reactive particles comprising a crosslinked elastomeric core, e.g. made of polysiloxane material, and a shell of reactive groups on an outer surface of the core, wherein the reactive groups comprise epoxy groups, ethylenically unsaturated groups, or hydroxy groups; and (c) an appropriate photoinitiator, e.g. a radical photoinitiator; and a cationic photoinitiator. A method of making a 3- D object from such a composition and a 3-D object made by the method are also provided. The cured composition generally has a smooth surface. The use of the reactive particles makes the composition more stable and the particles do not readily separate out.

L'invention concerne une composition photodurcissable, contenant (a) un monomère photodurcissable, p. ex. un monomère durcissable par voie cationique et/ou un monomère durcissable par voie radicalaire ; (b) des particules réactives comprenant un noyau élastomère réticulé, p. ex. constitué de polysiloxane, et une couche de groupes réactifs sur une surface extérieure du noyau, ces groupes réactifs comprenant des groupes époxy, des groupes éthyléniquement insaturés ou des groupes hydroxy, et (c) un photoamorceur approprié, p. ex. un photoamorceur radicalaire, ainsi qu'un photoamorceur cationique. Cette invention concerne également un procédé de création d'un objet en 3D à partir d'une telle composition ainsi qu'un objet 3D créé selon ledit procédé. La composition durcie présente généralement une surface lisse. De plus, l'utilisation de ces particules réactives rend cette composition plus stable et ces particules ne se séparent pas facilement.

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