Process for the production of a bis-azomethine pigment

Details Process for the production of a bis-azomethine pigment Process for the production of a bis-azomethine pigment

C - Chemistry, Metallurgy

09

B

260/429.3

C09B 55/00 (2006.01) C08K 5/00 (2006.01)

Patent

CA 1111436

Abstract of the Disclosure A process for the production of a bis-azomethine pigment having the formula Image in the pigmentary form in which it has an orange red colour and, under the conditions defined by the C.I.E. system of colour measurements, has a x chromaticity coordinate of from 0.59 to 0.63 and an y chromaticity coordinate of from 0.33 to 0.36, which process comprises: a) forming a suspension of 2-hydroxy-1-naphthaldehyde in an alkaline medium in the presence of an antioxidant, b) reacting this suspension with the stoichiometric proportion of o-phenylene diamine required to form - 1 - the compound having the formula Image II c) metallising the compound of formula II with a solution of a nickel salt d) reacting the metallised compound of formula II with the stoichiometric proportion of 2-hydroxy-1-naphthal- dehyde required to form the compound of formula I and e) isolating the compound of formula I. - 1a -

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