Process for the preparation of an n,n'-dimethyl-...

Details Process for the preparation of an n,n'-dimethyl-... Process for the preparation of an n,n'-dimethyl-...

C - Chemistry, Metallurgy

09

B

260/274

C09B 57/00 (2006.01) C09B 5/62 (2006.01)

Patent

CA 1082192

Abstract of the Disclosure: N,N'-dimethyl-perylene-3,4,9,10-tetracarboxylic acid di- imide is obtained as a valuable pigment of a pure red shade, by reacting perylene-3,4,9,10-tetracarboxylic acid anhydride at low temperatures with a dilute aqueous solution of at least the four-fold molar amount of methylamine. The so-obtained bis-ammonium salt of the bis-N-methyl amide is then heated without isolation to effect ring closure while spiitting off two mols of water and two mols of methyl amine. The product can be used without any finish operation or cah be after- treated to yield a pigment of an exceptionally high trans- parency or of a good hiding power.

244944

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