Document BvdJGaQwOwaM0wpDRyoQdZG3j
iGMENTS DEPARTMENT
* CHESTNUT RUN
LABORATORY REPORT THIRD & PINAL
CONFIDENTIAL .
j
THIS REPOST IS FOR CL'S- '
TOMER'S INTERNAL USE ONLY ) IT IS NOT TO BE COPIED I WITHOUT THE PRIOR WRIT. TEN CONSENT OF DU PONT i
CUSTOMER
WORK REQUEST NO.
DATE
NC-6-73
December 17/ 1973
.DISTRIBUTION
E. W. Stewart, Pigm* C,R./ C. R, Pile
W. W, Riches, Pigm, C.R, G. Wormaid, Pigm. C.R. L. A. Schlapfer, Pigm. C.R. R. E. Edelman, Pigm. C.R,
* W* S. Struve, Pigm, Newark R, Gedd, Pigm, Nevrark
E, E. Jaffe, Pigm. Newark ` . \G. R. Aldiidge, Pigm, Newark ,
J. M, Lipton, Pigm, Wilm* A. P. Lewie, Pigm. Wilm. H. W. Ling, Pigm. Wilm, J. McQnllken, Pigm, Wilm. R, E, Err.mert, Pigm, Wilm.
j, W. Minnich, Pigm. Newport E. W, C-iilow, Pigm. Newport R. K. Wetzel, Pigm. Newport H, Matrick, Pigm. Newport
SUBJECT
MOHASTRAL BLUE G, 3T-476-D IN CLEORESINDUS INK
INTRODUCTION:
The First Report (4/30/73, VJL) reported the Cov/les dis
persibility of. BT-476-D SW -73 -1074 6 .(semi-works ) comparable to
Ciba-C-elgy 's Xrgalite Blue, I OLD in a publication gravure
heatset ink.
""
The Second Report (9/17/73, JAM) reported initial BT-476-D, ' production (five lots tested) and most lab finished BT-476-D samples unsatisfactory .as, Cowles dispersible products.
This report covers Cowles dispersibility of 2nd BT-476-D
plant production, lab finished samples and Ramapo Blue B, BP-173-D.
BP-173-D was included because
generally has good dispersion'
properties in oleoresinous ink systems,
CONCLUSION : SU1&IARY;
All BT-476-D production and lot finished samples tested are
not considered satisfactory Cowles dispersible products', They
are inferior to LGLD because they had tailings. separation and
generally poorer texture after one canning pass (medium tight
setting.) o?er"tHe three roll mill,
-
BP-173-D had minimal tailings and separation and fair texture and is' also considered not Cowles dispersible.
Changes made in grind pigmentation, volume levels, grind
temperature and time did not improve 3T-476-D plant production Cowles performance,
LAB WORK BY: G. W. Rodgers
SiftMFD
/ ^ O M.
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DUP050109363
2- (Continued)
NC-6-73
EXPERlMSiiTAL DETAILSi pigments Tested See Table I for listing.
Ink preparation
Cowles dispersed heatset ink made per TF-2302. LGID was ground at 20.66 pigment and most BT-476-D samples were ground atr27.r80^ pigment (considered optimum pigment loading')
References
XTC-6-73 ILF-33-73
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