Process for the continuous drowning of perylene melt

C - Chemistry – Metallurgy – 09 – B

Patent

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C09B 5/62 (2006.01)

Patent

CA 2327724

This invention relates to a continuous process for preparing perylenes by (a) continuously mixing a melt of the leuco form of a perylene tetracarboxylic diimide obtained by alkaline fusion of naphthalimide with a continuous water-containing stream containing (1) 2 to 50 parts of water per part of melt, (2) 0 to X1 moles of oxidizing agent per mole of the leuco form, (3) 0 to Y1 parts by weight of processing additives, based on the leuco form, and (4) 0 to Z1 parts by weight of an acid, based on the leuco form of the perylene tetracarboxylic diimide, to form a slurry; and (b) optionally mixing the slurry in one or more continuous or batchwise steps with a second stream containing (1) 0 to 10 parts by weight of water, based on the slurry, (2) 0 to X2 moles of oxidizing agent per mole of the leuco form of the perylene tetracarboxylic diimide, with the proviso the total of X1 and X2 represents at least the molar amount of oxidizing agent theoretically needed to oxidize all of the leuco form of the perylene tetracarboxylic diimide, (3) 0 to Y2 parts by weight of processing additives, based on the leuco form of the perylene tetracarboxylic diimide, with the proviso that the total of Y1 and Y2 is from 0 to 5 parts, and (4) 0 to Z2 parts by weight of an acid, based on the leuco form of the perylene tetracarboxylic diimide, to give a perylene pigment.

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