PROCESS FOR PREPARING N,N'-DIMETHYLPERYLENE-3,4,9,10- TETRACARBOXYLIC DIIMIDE IN TRANSPARENT PIGMENT FORM

Title:

PROCESS FOR PREPARING N,N'-DIMETHYLPERYLENE-3,4,9,10- TETRACARBOXYLIC DIIMIDE IN TRANSPARENT PIGMENT FORM

Document Type and Number:

Japanese Patent JP2000063688

Kind Code:

A

Abstract:

To prepare a transparent dimethylperylimide pigment by a simple process without causing environmental problems.

In a process for preparing N,N'-dimethylperylene-3,4,9,10- tetracarboxylic diimide, two mol of monomethylamine per mol of perylene-3,4,9,10-tetracarboxylic dianhydride and water in a wt. of at least three times that of the dianhydride are used. The process includes the reaction conducted at 50-200°C; the removal of unreacted monomethylamine by distillation; wet grinding the resultant crude pigment; and isolating the pigment obtd., provided that at least one additive selected from pigment dispersants and surfactants is added before or during the wet grinding.

Inventors:

URBAN MANFRED
BOEHMER MARTIN
WEBER JOACHIM DR

Application Number:

JP22796399A

Publication Date:

February 29, 2000

Filing Date:

August 11, 1999

Export Citation:

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Assignee:

CLARIANT GMBH

International Classes:

C07C255/00; C09B3/18; C09B5/62; C09B62/014; C09B3/14; C09B67/00; C09B67/04; C09B67/22; C09K23/32; (IPC1-7): C09B3/14; C09B3/18; C09B67/04

Attorney, Agent or Firm:

Yoshio Kawaguchi (2 outside)

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