Document mqvjgLMzXZd3n5xYJyMZMMQ0g

E. I. DU PONT DE NEMOURS & COMPANY PIGMENTS DEPARTMENT 256 VANDERPOOL STREET NEWARK, NEW JERSEY Copy No. 1 Numerical File Period Covered: NEWARK PLANT PIGMENT COLOR RESEARCH REPORT Final Report PARA BED B,, KT-442-D EGONOM STUDIES S8ISI-WOM5B & PLANT OCTOBER 1944 to DECEMBER 194 FILE: DATE: 221., 1 11/27/45 NJ3*e ..Ta7T7 ................ ..... ....... . Serial Ho. KH-45-82 Copy No, 1 Copy tos #1 - Numerical File 2 Research Office (221,1) 3 Library File (221.1) 4 - #10 Buildlag File % Imperial Chemical Industries, Ltd. II Dawson, Newark NEWARK PLANT PIGMENT COLOR RESEARCH REPORT Final Report PARA RED B, HT-442-B 1C0N0BH STUDIES SEMI-WORKS & PLANT OCTOBER 1944 to DECEMBER 194?. SUBMITTED BY* V. Chalupski APPROVED BY* V. Chalupski X?. f 9VJ" DATE SUBMITTED* 11/20/4? DATE ISSUED* n/27/4? DUP050150771 -2- j L 'IOMt Laboratory recommendations for reduction of ingredient costs of RT-442-D were given a semi*works trial, and then applied in the plant. A Blight change in tinctorial properties restating from the ingredient modifications was acceptable to the Sales Department and the process was, therefore, standardised and a new formula, K-2218, was written. All plant production of RT-442-B and of the pulp, Rf-35-P, has been by the new process since the middle of 194 m&MUt Mmmm&i Laboratory work is discussed in Research Report KB-45~7 A single semi-works batch was made incorporating four of the laboratory suggestions* - 1. Decrease amount of Mono Acid F by 20# 2. Omit phenyl-methyl-pyrazolone accessory agent. 3. Omit cooling beta-naphthol solution for coupling, using a higher coupling temperature. 4. Omit cooling of pigment slurry after heat development before adding Barium Roainate. All of these changes result in an Ingredient saving of about 3{ per lb. Semi-works batch was close to standard in mas stone and yellow in tint; this change in tint was discussed with the Sales Department, who agreed to accept it. After several months delay due to the demand for standard quality, a plant trial was finally made at 450 lb. batch size. This batch was dark in masstone and yellow in tint. A series of 3 more plant batches.were then made at a larger plant size, 790 lbs. These also were somewhat dark'in masstone and light and yellow in tint* A mix of the 4 plant batches mentioned above was proposed as standard in March 1945 and was finally approved early in June. Plant pro duction was then changed over to the new process* A large percentage of the production during the next few months was light in mas atone compared with the new standard. A study of these batches Indicated that this resulted from over-washing, and possibly the use of dried barium resiaaate Instead of freshly prepared slurry barium resinata. Shading material was made from time to time using increased amounts of Mono Acid F, but this is undesirable because of increased cost* By correction of the two factors mentioned above better control of masstone was finally obtained. A new standard formula, K-2218, was set up in September, 1945 and the process was turned over to the Production Department. DUP050150772 -3A new goal yield was established on the revised process in the laboratory, & 1-2/2# increase in yield over the old determination was indicated) this is equivalent to 799 lbs. "as is" for the plant size formula, compared with the old figure of 78? lbs. The new figure Is consistent with plant performance, which showed a per formance average of 788 lbs. for the 12 batches made during the development work. See Development Section Data Book DSH-45-24 Laboratory deal field Study Research K.B. 908-31* DU P050150773