Document N2LrkD9Rg9K2d8oOX4wyxb3w8

E. I. DU PONT DE NEMOURS & COMPANY KREBS PIGMENTS DEPARTMENT 256 VANDERPOOL STREET NEWARK, NEW JERSEY Serial NoKH-51-27 Copy No. 1. Numerical Pile NEWARK PLANT o PIGMENT COLOR RESEARCH REPORT A Progress Report \ S RL-211-D. FIGMEHT SCARIET LAKE IMPROVED STREHGTH AHD DISPERSIOH. A Period Covered SEPTEMBER 1949 TO DECEMBER 1949 ) NJ 8747 FILE: DATE: 228.41 4-30-S1* Copy toi Serial So. IOH51-37 Copy So* l. numerical Pile mmkK o t a w mmm c o m bes ear c h mfm Progress Report BI*-2ll~D* ?Wmm SCABIES? LAKE IMPROVED STBEHGTB ASD DISPERSIOH* SEPTEMBER 1049 TO J35CBMBEB 1949 Charge* H(0O)~Xl-39 SUBMITTED .ffit APPROVED Bz DATE SIJUTTED* 4*a*Sl 4-30-51 DUP050068505 4 t yfo* ^>psa]>aao$ on tho au>k0t of Figadst Scarlet T^V^ii superior to RI*211*D in strength and dispersion in vinyl plaatie led to an investigation designed to improv* RL-211-D* mmaumjmmmi 1. A out in dye content of RLH311~Df Shile increasing the base to Maintain yield, aocoBg>lishes a relative in* crease in strength and an improvement in dispersion in vinyl plastic* That Is, the decrease in strength resulting tvm the dye out is less than that calculated. 8. A 80g out in dye, with a corresponding increase in base, appears to give the optimum dispersion in vinyl plastie, end the best relative rdbout strength* 3* Attempts to elininate znO from the formula were unsuocessf&l* Details of the experiments will be found by consulting the notebook references listed belov. in addition to tho essential results given above, some information was developed on the apper* tionment of the base between strike and a portion added later. HB-1310-7) *8} -9} *10j *11| *18. OJCKjlg DUP050068506