Silica encapsulated organic nanopigments and method of...

C - Chemistry – Metallurgy – 09 – B

Patent

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C09B 67/08 (2006.01) C09D 11/00 (2006.01)

Patent

CA 2718927

Core-shell nanoscale pigment particles include a core organic pigment composition including nanoscale particles of organic pigments, and a shell layer of surface-deposited silica, where the organic pigment particles are selected from azo-type pigment particles, azo laked pigment particles, quinacridone pigment particles, phthalocyanine pigment particles, and mixtures thereof. The core-shell nanoscale pigment particles can also include an organic primer layer covering the core and located between the core and the shell layer. The core-shell nanoscale pigment particles can be made by preparing a core composition including nanoparticles of organic pigments, and encapsulating the core with shell layer of surface-deposited silica and an optional organic primer layer located between the core and the shell layer.

L'invention concerne des nanoparticules de pigments à noyau-enveloppe comprenant une composition pigmentaire organique de noyau comportant des nanoparticules de pigments organiques, et une couche d'enveloppe constituée de silice déposée en surface, les particules de pigments organiques étant sélectionnées parmi des particules de pigments de type azoïques, des particules de pigments laqués azoïques, des particules de pigments à base de quinacridone, des particules de pigments à base de phtalocyanine, et des mélanges de celles-ci. Les nanoparticules de pigments à noyau-enveloppe peuvent également comprendre une couche de primaire organique couvrant le noyau et située entre le noyau et la couche d'enveloppe. Les nanoparticules de pigments à noyau-enveloppe peuvent être obtenues par préparation d'une composition de noyau comportant des nanoparticules de pigments organiques, et encapsulation du noyau à l'aide de la couche d'enveloppe de silice déposée en surface et d'une couche de primaire organique éventuelle située entre le noyau et la couche d'enveloppe.

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