Colour changing composition and colouring polymeric articles...

G - Physics – 03 – C

Patent

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

Patent

CA 2338635

A process is provided for producing a polymeric layer having a desired image thereon or a three dimensional article comprising a number of such layers in which a layer of a liquid photocurable composition which comprises photo colourable particles is cured by light and selected areas thereof are irradiated with light of a different dose, thereby forming the desired image which composition comprises particles dispersed in it which are micro-capsules containing a photosensitive colour changing composition within a barrier layer which is substantially impermeable to the components of the colour changing composition or are solid particles comprising an immobilised photosensitive colour changing composition. The process permits the use of the same initiating mechanism to cure the resin and to change the colour of the particles.

L'invention concerne un procédé de production d'une couche polymère comportant une image voulue ou d'un article tridimensionnel comprenant plusieurs couches, le procédé consistant à photodurcir une couche d'une composition photodurcissable liquide comprenant des particules à photocoloration et à irradier des zones sélectionnées de cette dernière avec une lumière à dose différente, ce qui permet de former l'image voulue comprenant des particules dispersées qui sont des microcapsules contenant une composition de changement de couleur photosensible à l'intérieur d'une couche de barrière sensiblement imperméable aux composants de la composition de changement de couleur, ou des particules solides contenant une composition de changement de couleur photosensible immobilisée. Le procédé permet d'utiliser le même mécanisme d'initialisation pour durcir la résine et pour modifier la couleur des particules.

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