Azo pigment preparation

Details Azo pigment preparation Azo pigment preparation

C - Chemistry, Metallurgy

09

B

C09B 41/00 (2006.01) C09B 67/18 (2006.01) C09B 67/20 (2006.01) C09D 11/02 (2006.01)

Patent

CA 2627767

The invention relates to an azo pigment preparation which is characterized by a content in 4,4'-diamino-dicyclohexyl-methane, the percentage of the trans,trans isomer being at least 25 %, based on the total in 4,4'-diamino- dicyclohexyl-methane. The azo pigment preparation according to the invention is especially suitable for producing gravure inks having improved optical density, higher luster and no ink show-through in the gravure printing of illustrations.

Préparation d'azopigments caractérisée en ce qu'elle contient du 4,4'-diamino-dicyclohexyl-méthane, la part de l'isomère trans,trans représentant au moins 25 % par rapport à la quantité totale de 4,4'-diamino-dicyclohexyl-méthane. La préparation d'azopigments selon la présente invention est adaptée en particulier pour la fabrication d'encres pour héliogravure à densité optique améliorée, à brillance accrue et à non-transpercement lors de l'impression hélio de papier pour illustrations.

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