Process for making green pigment compositions useful for...

C - Chemistry – Metallurgy – 09 – B

Patent

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C09B 67/22 (2006.01) C09B 67/00 (2006.01) C09B 67/04 (2006.01) C09D 11/00 (2006.01) C09D 11/02 (2006.01) G03F 7/00 (2006.01)

Patent

CA 2458687

The invention pertains to the field of green colour filters and LCDs. It has been found that pigments with surprisingly improved coloristic, chemical and physical properties are obtained by salt-kneading a halogenated phthalocyanine pigment together with a yellow pigment of the disazo condensation, barbituric acid or azoquinolone series. The process takes place in the presence of an organic liquid and in the absence of binder or optionally in the presence of a relatively small amount of binder. Claimed are the process itself as well as the green pigment composition obtained by the process and compositions comprising it.

La présente invention concerne le domaine des filtres couleur verts et des afficheurs à cristaux liquides. Il a été trouvé que des pigments possédant des propriétés de couleur, chimiques et physiques étonnamment améliorées sont obtenus par malaxage, avec ajout de sels, d'un pigment phtalocyanine halogéné avec un pigment jaune de la série constituée des produits de condensation de disazo, de l'acide barbiturique ou des azoquinolones. Ledit procédé s'effectue en présence d'un liquide organique et en l'absence d'un liant ou éventuellement en présence d'une quantité relativement faible de liant. La présente invention concerne le procédé lui-même ainsi qu'une composition de pigments verts obtenue selon ledit procédé et des compositions contenant ladite composition.

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