Photoinitiated reactions

G - Physics – 03 – F

Patent

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Details

G03F 7/029 (2006.01) B41C 1/05 (2006.01) B41M 3/00 (2006.01) C08F 2/50 (2006.01) G03F 7/004 (2006.01) G03F 7/031 (2006.01) G03F 7/038 (2006.01)

Patent

CA 2455220

Photoinitiated reactions especially in photopolymer technology, as well as photoinitiated colour forming reactions are achievable by applying a reactive substrate selected from a polymerisable and/or crosslinkable composition and a colour changing substance to a support, activating a latent photoinitiator applied with the reactive substance and subsequently exposing the reactive substrate with the resulting photoinitiator therein to photoreaction conditions wherein actinic radiation causes the substrate to undergo polymerisation and/or crosslinking or colour change respectively, the substrate being locally modified in its constitution as a result of its exposure to actinic radiation at least one stage of the method, so that the resulting polymerised and/or crosslinked composition or colour changed substance corresponds in its distribution on the support to the locations of the modification of the substrate.

L'invention porte sur des réactions photoamorcées touchant spécialement au domaine de la technologie des photopolymères, et sur des réactions photoamorcées de formation de couleurs. Lesdites réactions s'obtiennent: par application à un support d'un substrat réactif choisi parmi une composition polymérisable et/ou réticulable et d'une substance de couleur modifiable; par activation d'un photoamorceur latent appliqué avec la substance réactive; puis exposition du substrat réactif et du photoamorceur résultant qu'il contient à des conditions permettant une photoréaction dans lesquelles un rayonnement actinique fait subir au substrat, soit une polymérisation et/ou réticulation, soit un changement de couleur, le substrat étant localement modifié dans sa constitution suite à son exposition au rayonnement actinique pendant l'un au moins des stades du procédé pour que la composition résultante polymérisée et/ou réticulée, ou la substance de couleur modifiée, corresponde par sa distribution sur le support aux emplacements des modifications du substrat.

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