Document QkeN9kxo5EyQp9y2vwLxEzwa6

E. I. DU PONT DE NEMOURS & COMPANY KREBS PIGMENTS DEPARTMENT 256 VANDERPOOL STREET NEWARK, NEW JERSEY KS-44-20 Copy No. / LIBRARY c o p y A r'/Y - ~ .0 Period Covered: NEWARK P LANT PIGMENT COLOR RESEARCH REPORT Progress Report Use of Bo b --precipitating froctlun Eosinate in RS-488-D, RX-242-P, BX-443-D, RE-526-D, and XP-440-D Bovoaber, 1941 - February, 1942 FILE: DATE: 222,25 4/12/44 NJ8S3B N39987 3 3J, Serial No. 0-44-20 Copy Ho. i Copy to: #1 - Numerical File 2 - Research Office (222.25) 3 - Library File (222.25) .4 - #10 Building File 5 - # 6 * .76 - - Imperial Chemical n Industries. w Ltd. n 8- * n n 9 - Mr. C. H, Rupprecht, Wilmington (ICI File) NEWARK PLANT PIGMENT COLOR RESEARCH REPORT Progress Report Title: Use of non-precipitating Sodium rosinate in RT-488-D, Rf-242-0, RT-443-D, RE-526-0, and YP-440-D Period Covered: November, 1941 - February, 1942 SUBMITTED BI: E J. Bess t.yqfaw DATE SUBMITTED* 3-17-44 N39987.01 DUP050150329 -a- The use of Sodium rosinate in many of our important organic colors has introduced a problem in large scale production which has caused considerable difficulty during the past few years. The trouble involves the precipitation due to over cooling of rosinate solutions as ordinarily made during the process of transfer from solution tank to strike vat. She precipitation usually occurs in the hose line and continues until the hose has been heated to a sufficiently high temperature (over 120F) to prevent this undesirable effect. The presence of free rosin or sodium rosinate results in a definite fire hasard as well as a probable source of variation in quality. The situation has been remedied in the plant by redissolving or returning to the solution tank the first ten gallons of rosin solution running through the hose* This has worked satis factorily to prevent fires but it represents an increase in labor cost. During the course of a general study on the. preparation of rosin solutions it was discovered In the laboratory that if the proper conditions of alkalinity mad solution concentration were used, a sodium rosinate solution could be prepared which did not precipitate even on the addition of ice. Considerable precipitation would result if an orthodox rosin solution was treated in a similar manner. A comparison of the ratios of rosin to caustic soda to gallons of cold water used in preparing plant scale rosin solutions by the orthodox and proposed new method follows: Sew method: 8*25# rosin - 1# SaQ3 100$ - 8-1/4 gal.water Std. method: 8.25# n - 1.65# NaOH 100# - 14 gal .water The following report covers the use of tide new type rosin solution in various rosinated organic toners and its effect on tinctorial properties. The colors in which this change has been tried are listed below: BT-242-D1 KT-443-D: RX-438-0: RE-526-D: YP-440-D: 1 plant batch 1 plant batch I Semi Works batches 2 plant batches 1 Semi Works batch DUP050150330 -3- aaAL All of this study on the various rosinated colors was conducted during the latter part of 1941 and the early part of 1942. The only variation from the normal procedure In volved In the preparation of this type rosiaate is the necessity for carefully checking the solution during the toiling to insure the maintenance of a very slight test for alkali on Clayton Yellow paper. This control test insures complete saponification of the rosin which Is necessary for good results (the clarity of the solution obtained is no indication of the completeness of saponification as free rosin is soluble in sodium rosinate solution). Care must be taken in adjusting alkalinity at this point because of the fact that if too much alkali is used the non-preeipitating feature of this solution disappears. The plant batch of RT-242-D (lot 91539) was made to check the standard K-9955 except for the use of the special rosinate solution. The product ground out light in masstone, 6$ strong and slightly blue mad clean versus the standard. Indications are that this material is somewhat blighter and weaker than is normally obtained with this formula. The theory was advanced at this time that a probable reason for the lighter masstone obtained was the lowering of development alkalinity resulting from the fact that the caustic soda used in the sodium rosinate solution was cut from 30 pounds to 10-1/2 pounds per mol batch. Although the validity of this theory was not tested in RT-242-D (where it would probably hold) it was decided to e&tinate this uncontrolled variable in the next color tried by making up the alkali deficiency by adding extra alkali after the rosinate addition. Consequently, in the trial of the special rosin in the RT-443-D, K-9507 formula enough extra alkali was added to bring the total caustic soda amount up to the standard figure. In spite of this a comparison of the trial batch (lot 91177) with a control showed that the light masstone effect still persisted* Strength was not affected in this case and both batches were dark, equal in strength and yellow versus the BT-443-D standard. , This, same effect resulted in two plant batches (lots 90901,90130) of the extended BT-443-J) product, RB-526-D. Light masstone material was obtained 1 v : ' in both oases. In two Semi Works batches of RT-488-D (K-1A36 formula) the special rosinate gave the expected light masstone effect. Strength was practically unaffected but tints were somewhat yellower than the control samples. DUP050150331 In the case of RT-488-0, however, when the alkali deficiency resulting from the use of the special roslnate solution was corrected a check to the normal control hatch in masstone and tint was secured. A trial of the special roslnate in the YP-440-0, K-9590 formula gave a light masstone, very slightly less transparent result against a control batch. This is the usual effect of an alkali decrease In this formula and It is probable that normal results would be obtained if the alkali amount was adjusted to the standard figure subsequent to the addition of the roslnate. The above results show that this non-precipitating roslnate solution could be used in the plant for most colors share rosin is a component hut it was questionable as to whether the super visory time necessary to carefully control the alkalinity of the solution during the boiling cycle was available at the time. Consequently, it was decided to continue with the ordinary type solutions, "re-dissolving" or "recirculating" as necessary to eliminate the fire hazard. Reconsideration of this decision may be desirable at the present time because of the availability of more supervision and on the basis of the following advantages: 1* Kon-precipitating feature makes it unnecessary to recirculate or redissolve the roslnate solution. This is desirable not only from the slight saving in time but also from the safety angle connected with the transporting of 5-10 gallons of hot alkaline roslnate solution up one or two flights of stairs to the dissolving vat or to a steam line* 2. The decrease in volume (about 50)5) which probably results in a small steam savings. 5. Possibility of more rapid cooling, when necessary, by the use of ice or cold water. Under present conditions about the only sure way of eoollngwLthout the danger of precipitation is to stir and this is only possible down to a minimum temperature of 120-130P. BfBM mUMt RT-242-0 RB 637 page 132 RT-443-D 088-43-58 RT-488-0 0SH-44-3 RR-526-0 088-43-31 TP-440-0 088-43-49 DUP050150332