Document 5DvqYD937mrvJa5D7KnB2mbpV

E. I. DU PONT DE NEMOURS & COMPANY KREBS PIGMENTS DEPARTMENT 256 VANDERPOOL STREET i NEWARK, NEW JERSEY 105-51-35 Serial No. Copy No. 1. Numerical pile t, NEWARK PLANT PIGMENT COLOR RESEARCH REPORT Pinal Report (Laboratory) riCu.n:iJT g r een b ELIMINATION 07- SODIUM BISULFITE Period Covered JANUARY - ABRIL 1951 r'N ci n NJ 8747 FILE, DATE, 223.71 5/3/51 Serial o# KH-S1-36 Copy Ho.l. Humorleal Pile Copy to t #1 * Huaerieal Pile 2 - Research Office j,223. $ * Library File {823.1 t- H. Aratrol * Plant . V* P. Speageiaaa/J* B* Callaway/P. f# Monahan 6 P. H* Yully/Vsiagel/Library * W* S# " " "... ` HEWARK BLAST PIGMEHT COM RESEARCH REPORT Pinal Report (Laboratory) yrtansm itmsm B ELXMXHATIOH OP SODIUM BISULFITE JASUABY - APRIL 1001 Charge t A*lC2t af^- SUBMITTED Bit APPROVED BY t c. $am a. DATE SUBMITTED1 4/20/81 DATE ISSUED! 5/3/Sl DUP050068593 A threatened sodium bisulfite shortage in January caused consideration of the Manufacture of sulfite* In the course of this short study* a reasonably satisfactory procese vac outlined but the product did not equal current standards. Gonse- quentlyjwas of no Immediate interest* The bisulfite shortage did wft. nairialise A study of the manufacture of Pigment Green B omitting the bisulfite ester step has shown that a marketable product vas Obtained by atrlking a eopperas/oxalio acid solution into an alkaline solution of nitroso-B-n&phthol* After heat development at the boil and pro* ceasing in the nomal manner* a product was Obtained which was yUo*9 strong (+ SffJ.snd toll *#n dried snd compared by rtfbout to GT*046*j or yellow* toll* weak and bins when processed as a pulp and ooapared in paper coating to GT-76-P. Obviously this product would bo of ns interest If bisulfite were available; however in the event thet bisul fite beoase unobtainable* the product might be developed into a satisfactory replacement for the current type of Pi&aent Green B .The introduction of bisulfite to the alkaline nltroso-Bnaphthol solution eauatd the tinctorial properties to approach those of the orthodox type but at 78g of the normal amount there was a deficiency in intensity when dried end in strength whsn processed as pulp* At some future date it nay be deslreble to oontinue the study* Refer to notebook 1064 Expta. 43* 44* 46 00 tig DUP050068594