Document XRX9Nj1pRdLE3EabqL6wRwd7J

E. I. DU PONT DE NEMOURS & COMPANY KREBS PIGMENTS DEPARTMENT 256 VANDERPOOL STREET NEWARK, NEW JERSEY Serial No. Copy No. K3t~44.-59 / ! t NEWARK PLANT PIGMENT COLOR RESEARCH REPORT Progress Report Period Covered: Slllco Molybdle Acid Blue Toner, &-1962 Seal Wcoflca study October 1945 - May 1944 FILE: DATE: N37942 DUP050149755 Serial So-. 8-44-59 Copy So. i Copy tot 1 tmuftml. File Steseereb Office (223*21} MTmmf File (223.21; rio Balldlag Imperial Cbeiaioal Industries, ltd. a # 'a . n :ir. T F Daley, Wilmington (Id- Flle)&-*'4^ vi SEWASK PX.4ST PIGMEKT COLOR RESEARCH REPORT Progress Report Titles Period Covered* October 1943 - May 1944. SUMMED Bis APPROFED Bit F, CHalppsJci DATE SOiITTE0s 10-4-44 M* IMSODl I0-IO-44 DUP05dl49756 -a- umiiiBgfiQSi This report discusses the semi-works study of a ailico molybdie >spho Slolybile ___ tory standard Is 25$ stronger than BT-181*-D, and should therefore to strength of & reported competitive sanple at Henasha ... Ink Company, It was found Impossible to folly equal toe strati of the laboratory standard In the seal-works. It was finally recommended by Sales that no further attention be given to K-19d2 because of its poor color retention on outside exposure compared with BT-181-D and BT-191-0, This Inferiority would make It necessary to sell the new product at the PEA price, which Is unattractive. mmimm* Several closely related laboratory formulas were tried in the semi-works; small differences were obtained, tot in all cases the final products were in the order of 10 to 15$ weaker than the laboratory standard K-1962. Among toe variables studied were changes in acidity, amount of dye, omission of Gallic Acid and omission of the Soda Ash used for final neutralisation. The optimum amounts of dye and acid were not closely determined, but It is believed the formula amounts were fairly satisfactory. It appears that the omission of Gallic Acid did not injure the quality in any way. Omission of the Soda Ash also had no effect on quality, although its use may be desirable in toe plant to permit the use of an iron filter press. Attempts were made to determine the cause of weakness of semi-works products as compared to toe laboratory standard. In a % number of cases control samples taken from the vat were satisfactory in strength, bosses in strength during processing appeared to occur In two stages. (1) A loss of about 5$ In strength during large scale filtration and washing as compared with laboratory filtration and washing. (2) A strength loss of about 10$ which occurred during pulverisation. Some detailed pulverisation studies were made, comparing the & inch and 12 inch Mikropulverizexs, Results of these experiments were not conclusive and no further work was done because of the Sales Department*s decision to discontinue study of this pigment. mmmmm ..psiMfei* See BS8-44-17 DUP050149757