Document 3Jwyj1dQ9M9GLVNBj6Ev3b9RE

E. I. DU PONT DE NEMOURS & COMPANY KREBS PIGMENTS DEPARTMENT 256 VANDERPOOL STREET NEWARK NEW JERSEY Serial No. KN-49-4 Copy No. 1 V i \ * * NEWARK PLANT PIGMENT COLOR RESEARCH REPORT BENZIDINE YELLOW AXT-564-D (K-2402) 3.3 -dlchlorbenzidine-^- (acetoacet orthotoliiidide)2 Period Covered: 11/6/46 - 4/16/47 FILE: 4, DATEi 2/25/49 i * N N42188 Serial No. 0-49-4 Copy No. i Copy to? #1 * Numerical File 2 - Research Office (221.4) 3 - Library File (221.4; 4 - #10 Building File 5 - V. Chalupski - Plant Files 6 - D. B. Killian, Newark 7 - Extra NEWARK PLANT POTENT COLOR RESEARCH REPORT Final Report SEMI-WORKS DEVELOPMENT Title: BENZIDINE YELLOW AYT-564-D (JC-2402) 3,3'-dichlorbenzidine (acetoacet orthotoluidide)2 Period Covered? 11/6/46 to 4/16/47 Charge: A-IIC-220 APPROVED BY : A. SIEGEL DATE ISSBIDj 2/25/49 DUP050067145 Preliminary evaluation by rubout and in as&halt tile indicated that the K-2402 (AIT-564-D) process produced a satisfactory counterpart for Harmon's YB-2 Benzidine fellow and, therefore, warranted semi-works development studies* SUMMARY & COHCLP3IOSS Seven 30 lb, batches and one 90 lb. batch were made in the semi-works based on the K-2402 (AYT-564-D) process and the results indicated satisfactory performance fro an operating standpoint and good duplicability of laboratory prepared products. the process responded well to the variables studied, for example, coupling at 68F. resulted in a lighter masstone and slightly lower strength than coupling at $6ft elimination of the nitrous acid excess in the tetrazo by means of sulfamic acid resulted in lifter masstone. A blend, lot 9183, of five semi-works batches including lot 9157, 91591 9165, 9167, 9173, was set up as a temporary standard 8*0* 48511. It was decided to continue the development study of this process in the plant on the basis of lot 9196. .ggittBagaijag:^ DSN-49**? Semi-Works Development of YT-564-D. KH-49-3 laboratory study of K-2402. DUP050067146