Document Z9vO8m2B9bjZ8qG8RqMD4onV

Indexed "INDEXED"^*,M CC? J, B. Bullitt, mia. D-7016 0. H. Bullitt, Eup,, St&,,, Wilm. B. itorgan, Lab. <1. D, Pickens,Flint ? B. LVans, Lab, S, -0,. Homing, .lab. Patent Section, Lab. File? Amtell Laboratory October it, 1953 MOBASOTf REPORT 10, M-512 BIACK^ULOX^BIAHELS introduction .Attempts to duplicate a Flint Laboratory enamel, on a plant scale yielded a product of poorer istmss. Th only difference between these enamels was the resins employed, Thas resins show wry small differences in physical properties. This report hall comprise @ summary of the work undertaken at this laboratory, Summary and Conclusions Test on the enamel indicated that the problem re sulted owing to a difference in degree of dispersion. Grinding studies holding all variable* constant save the resin employed' demonstrate that the trouble arises in the grinding process and not in the let down step. Physical properties of the two resins show these to be the same within experimental error. Fractionation studies show a slight preponderance of higher molecular weight material in the laboratory resin. Grinding studies on each fraction to determine dispersion differences will be undertaken, Details The degree of dispersion was estimated using the fol lowing techniques? optical and election microscope studies, tinting strength, small angle light scattering and centrifugal separation. All these showed a slightly larger quantity of larger size pigment in the plant enamel* The physical properties measured on each reels? mmt acid number, hydroxyl number, solids content, infra-red spectra, moisture content and phthalic content. All these were alike within experimental error. Light scattering data showed that N35458 4* the coarse fraction of the plant resin was composed chiefIf of atonal in the & aileron rang whereas the lab resin had a broader distribution and larger material. Addition of gelled material to the laboratory resin grind failed to reduce the Wetness of the enamel obtained. Fractionation studies fielded the following results: 1. S&tracted with 12$ water in B-69, .2 Msmefced with 4$ water in l~69. 3. Bsstmebed with U~69* 4, Analysis of Besidue, ' ^LJgsin Plant Resin 1. 2. I: 962 98$ Bhpertuwatal details are found in lfetefeook 5488 (Septs. 0*37300 - tJ-373l8) wmm& tmmjmm s! 10-17-52 10-15-52 DUP030003443