Document 06VDag8VvXyeON9eoV2K565EV

Copy No. Hjr\ ; E. I. DU PONT DE NEMOURS & COMPANY PIGMENTS DEPARTMENT 256 VANDERPOOL STREET cCi XP if NEWARK, NEW JERSEY Q \ rv \ NEWARK PLANT PIGMENT COLOR RESEARCH REPORT WATER DISPERSIBLE LAKESi SEMI-WORKS & PLANT Period Covered; Sept. 44 - May 1946. sa % FILE; DATE; 8/1/46 NJ9609 N39995 S-srisi 5Ts, Copy ioo l = Cspy ta #1 Humerisal flit 2 > Rescareb Office {ill) 3 - Library File (X?l) 4 - #10 Building File 5 - #6 w 6 " Inporial Cheoieal Sadueiriesp Ltdo YC ' MH go 9 " Wc Fo SpcafssaaB Siemrk 10 JEsfera mums, piah t W<Ba CUTj OR IBSSEAReK Rf-rOKf Fintil Report sitiei w o s r smmM&r mms ffSMi-ifcspiiE an mm. Period Covered* aegtocix:!* 1944 - Kay 1946* MfS EB3SSm*?t July 10, 1944 DA'f/3 Mil'mS t 8/1/46 N39995.01 DUP050150429 INTRODUCTION la the fail of 1944., laboratory work a our lino of water dispersible lab had progressed to the point usher actai-works trial was deemed desirable (Be KH~46"13j Consequently a high spot dovolejssaesai study mo initiated in the seal-works to result ultimately ia final pleat standardisation of e,ch of the color in this line* Following a brief mi<worki development period which was concerned principally with study of drying variabless a basis for plant standardisation ms agreed upon* It was decided that three or mere Xakm of each cods would he Bsads using three separate hatches of representative tenor* then dryblended together te produe approximately 500 lbs ef standard material* aamaxjk mwmm Plant standards, imv been sttfg and formulas written* based an plant experience, for the water dispersible lakes listed below* Pc *649*,0 SP-262-& uh-554-o A3>555"B> sp-556s e s 55?d r l =,55'43 fh*5$6-D M 2304 (Pit*) 2305 2306 2307 2308 2305 2310 2311 2312 M&M Brilliant Croon fTk Methyl Violet FM Victoria Pur Blue BO PTS8& Toluidine Bed Matehnng Bod Rhodaalnc 8<2DH PH "Duel* Red Maroon Tenor Jfensa 7allow mmjm K-2314 (GT~347~P) 2315 (BT122-) 2318 (bT816X-5 2317 (RT-232~D)* 2318 (ftT-42$D) 2319 (BS-35T-OI 2320 (BT-283-Di 2321 (10-521-) 2322 Modified to omit accessory agent MP/u Worhen.t&'eaker Victoria Blu Pflft., "2X37* (coded KJX&l**) ms dropped by deoision of Sales* Two noteworthy exceptions to tho laboratory formulations were Kcsssesry* (1) In soma oases additional extender vjas added te the plant standard mix to match the laboratory standard strength* Thin added Chinn Clay v t .s ineorporated into the standard formula* thus revising alifhtly the toner/agreit/ extender ratio sot-up by the laboratory* Holds end cools were re-si sod aseordinglyo (2) The supply of Compound 0t 6 flakes having been out o~f, all colors wero standardised using a substitute dispersing agent. % Man col Co-accrtrntod Ponder {General Dyestuffs}* eheaieally similar to Compound 8* DIBCUS5I0H OF RESULTS Ifekina* Vith one exception* all W lakes are manufactured simply by blending the toner* in pulp form* with dispersing agent said extender In four DUP050150430 setups (approx, lfcO lba each) In the plant 55 gs.13.ffia Abbe Lon&rt Mixer* The exception is RK-55?"B which Incorporates BaClg la the formula to precipitate sulfate present in the dispersing agent* If allowed to remain, these impurities night affect the shade by Interaction with the barium *Buol* In eaoh ease* a email amount of dispersing agent (1G$ of the total) is added to the mixer before adding the toner pulp. This servos to slurry up th toner more readily* The regaining agent is added after all the toner is in th mixer* Th present batch sis of eaoh mixer charge has boon regulated to obtain optimum mixing (! maximum amount through louvers in side of basket, mtaimuM of tumbling over top of basket) Thera is aIso a ooncidentble amount of foaming which must be kept at a mjaitma by strict adherence to the stirring times specified by th formulae. Th amount of water used must be kept to a minimum (+1 gallon) in order to prevent separation of the pigment from th slurry as a hard agglomerate* Consequently in discharging the mixer, to avoid yield loco, troweling and squeegeeing the sides and bottom of the mixer are substituted for rinsing with valxr Prving The majority of ocmi-worke development work Involved a high spot drying study employing tray dryers at various temperature, and *. laboratory drum aryor* While lour temperature drying is desirable to secure mxlnvus strength, it is not at all practical from a production standpoint* There is a tendency at low teag>ratura (i** 14QF.) to fora a thin hard glaze ever th surface of the pigment on the trays, preventing uniform drying end slowing down the drying process to a matter of several days - possibly e week or more* With one exception it was deemed advisable to sacrifice some of the strength and dry at elevated temperature* at which no such "glazing" effect was apparent* Th exception was BS-557=.d s th* Buol lake* which weakened 20$ at l8o*Fe, and 10$ at 16C*F. & standard tamp* ef 140*5"* has been specified for this lake<> Ml others were satisfactorily dried at 180*5"* The laboratory drum dryer appeared to give satisfactory result although the higher temperatures involved in some instances had definitely harmful effects on tinctorial properties* la order to prevent separation of toner and extender, it is cscessary to pan out the slurry on trays and dry immediately after making* BrnsmskLisuas* Reference is cade to M-46-13 for a smmsary of laboratory wc-rh on this problem; to BS2J 46-17, part t for Seal-works end plant details oa redr3 and to DSII 46-17, part II for semi-works euad plant details oa blues, yellows and greens* Testing of the products was by brushout in casein with clay extensions to give deep and light tints* See TF-52**13o DUP050150431