Pigments having improved colouristic properties and process...

C - Chemistry – Metallurgy – 09 – B

Patent

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Details

C09B 67/04 (2006.01) C08K 5/00 (2006.01) C09B 67/00 (2006.01) C09B 67/10 (2006.01) C09D 11/02 (2006.01) G03C 7/06 (2006.01)

Patent

CA 2374977

The invention relates to a process for preparing pigments, which comprises: subjecting a crude pigment or mixture of crude pigments and a crystalline inorganic salt of mixture of crystalline inorganic salts together, essentially in the absence of other constituents, to the action of a rotor having a tangential speed of at least 10 m/s, so that a temperature of at least 80~C is attained by means of friction effects; and subsequently kneading the product of this treatment with an organic liquid, during which it is possible if desired to add additional substances selected from the group consisting of inorganic salts, inert additives and colorants. These pigments and their use in polymers, printing inks and colours filters are also claimed. The invention in particular relates to a novel pigment form of Pigment Violet 23 represented by Formula (I), obtained by above-mentioned process and having higher colour strength and colour saturation as well as excellent other applications properties in particular in printing inks. The invention also relates to a highly crystalline novel form of Pigment Red 254 represented by Formula (II), obtained by above-mentioned process, too, and having a steep slope on the bathochromic side of the absorption spectrum's maximum, and the use thereof in particular in colour filters.

La présente invention concerne un processus de préparation de pigments, qui consiste à soumettre un pigment naturel ou un mélange de pigments naturels, un sel cristallin inorganique ou un mélange de sels cristallins inorganiques, essentiellement en l'absence d'autres constituants, à l'action d'un rotor possédant une vitesse tangentielle d'au moins 10 m/s, de façon à atteindre une température d'au moins 80·C par effets de frottement, puis à malaxer le produit de ce traitement avec un liquide organique, malaxage durant lequel on peut, si on le souhaite, introduire des substances additionnelles choisies dans le groupe constitué par des sels inorganiques, des additifs de charge et des colorants. Cette invention concerne aussi ces pigments et leur utilisation dans des polymères, des encres d'impression et des filtres colorés. Cette invention concerne en particulier une nouvelle fabrication de pigment représenté par la formule (I) Pigment Violet 23 obtenue par le processus susmentionné, pigment qui possède une plus grande intensité de couleur, une plus grande saturation de couleur ainsi que d'autres propriétés d'application excellentes en particuliers dans les encres d'impression. Cette invention concerne aussi une nouvelle fabrication hautement cristalline représentée par la formule (II) Pigment Red 254, également obtenue par le processus susmentionné, et qui possède une forte pente du côté bathochrome du maximum du spectre d'absorption, et l'utilisation de cette fabrication, en particulier dans des filtres colorés.

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