Document qaMBx9LbKJYyg2gBdEeOy4BDE

Copy tot Serie! Ho. 0-44*49 Copy Bo. / Imperial Chemical industries. &M 7 $ a a 99 a 9 - Hr. V. Daley* miilsgl (XCX me) I?* ^? SSfAEK F&4BT PIGMEtiT COLOa RESMBCB REPQBT Progress Report Tile* SH-443-B. WX-HOMS D17L0PaEST STUDY OB "DIRECT LAKXBO* J10CEB9RE,K-2a39 Period Ceroreds SEPTEMBER - OCTOBER 1944 APPR07BD Bit 7. CEALUF^I DATE ISSUED* 11-16-44 N37153 z Bevelepment work m K-2Q39, the *Bireet baking* process for *Buol* Carmine has been started in the semi-works. The laboratory background on the *lreet Laklng* procedure for this pigment has beau described in KP-44-49. this report covers the semi-works study to date. Berea batches of K-2039 hare been prepared in the semi-works* Sth and aasstone rarity eaa both the light and dark side of K-2039 Pf-443-P standard tut with one exception strength and tint hare beta found to be satisfactory* She temperature for drying has been increased from 143?., specified in K-2039# to 160F, Shis was necessary to insure complete drying m semi-works scale* Insufficient drying results in light masstose# yellow weak tints* One lot (00-4957) of 4ml* ffMX has beau evaluated* Compared to control batches using *Idtfeo&* Acid HA* the crude PTMSA produc tion is sll^tiy on the defensive in intensity of masstone. In other respects including yield, the products are approximately equal to controls* fhe critical variables appear to be pH f the rattd solution prior to dlasotisation and pa of the BQS slurry before coupling. It is possible to adjust the BOB slurry with caustic soda solution to the required level of 10-11 with satisfactory results* fhe fflffli solution has been adjusted to the range of pi $-10 with lime slurry but caustic soda probably could be used* Contrary to laboratory findings, the pH after coupling can be adjusted* m one batch (7534) pi utter coupling was adjusted from 7.3 to 9*e with caustic soda. She resulting product was somewhat dull la masstone compared to Bf-443~B standard but approximately equal la strength dud tint* Increasing the batch else from 61 to 153 pounds had no deleterious effects* Further work is planned* DUP050149692