Document YrQZZVbR72wN8eb0Vxv3QbJrK

E. I. DU PONT DE NEMOURS & COMPANY KREBS PIGMENTS DEPARTMENT 256 YANDERPOOL STREET NEWARK, NEW JERSEY Copy No. 'P A V,3 /"'.'t . Period Covered: NEWARK PLANT PIGMENT COLOR RESEARCH REPORT p mb t Ljmmmm r e p o r t Red Toner, 2T- A Summary of Its Properties la Paints mmwfs ill M FILE: DATE; W-M* N37941 *H i CopE?y` to* Buaerical Serial So* Xfl-44-60 &W * / .* ape|lal Cteeoital Industries, Ltd. - 9* Jfcley, Wh*a&m. (Ici file)^- '*h '^7 1# Kelly .. *. * *` - ' '' - vV* ABE Irf PIGilEST COLQB PAIS? LABORAXOBX BIPOBf fitlet Bed foner, HT-427-D A ftMMty of Its Properties in Paints DUP050149750 2 Bed Toner, Bf~42?-D Is m asodyestuff pigment manufactured from para ohlor ortho aitraalline and Beta aaphthol and is aa isomer of Fire Toner Bf-396-J> (0CP8-BB) Both colors have excellent lightfastness, BT-427-D being somewhat better. Since we are the only dry color house marketing the BT-427-0 type pigment. It was considered desirable to review our background on this color and develop easy additional information necessary for a critical assay of this pigment both from its technical end economic aspects. This report covers new experimental work as well as a review of past work. Some of the enamels shown in fables X and It are being exposed in S-6895. RT-A27-D is a pigment dyestuff Intermediate in hue to RT-396-D and RT-3S6-B. It is slightly superior to the former and very slightly superior to the latter in (* S-333?). In hiding bower, it is definitely more transparent than Rf-39o-D and Rf-386-0t the latter two are approximately equal in opacity (of S-3130 end fable X). To compete with RT-396-D on an equal hiding basis, BT-427-D would have to sell for approximately 50/f/lb. and at roughly 65/ to compete with RT-386-D. The relative hiding levels of RT-427-D and HT-386-D are shown graphically in Fig. I where the contrast ratios at two different film thicknesses are plotted against P/B ratio* The contrast ratio data check the visual comparisons recorded in fable 1 fairly well* Thus, whereas visual comparisons show equal hiding for RT-427-D at 25/100 and RT-386-D at 13*6/100, the contrast ratio curves indicate equality at 25/100 and 13/100 respectively. In gloss * RT-427-0 is somewhat inferior to both BT-386-0 end RT-396-D. This is particularly apparent at higher P/B ratios* Thus, in KR-41-106 it was shown that while BT-386-D maintained excellent gloss up to a P/B of 50/100, BT-427-0 fell off rapidly In gloss above 20/100, Because of the rapid loss in gloss that RT-427-D enamels undergo as the P/B ratio exceeds 20/100, it is impossible to match both the hiding and gloss of a toluldlne enamel with BT-427-0 when toluldlne Is formulated at practical pigment/ binder ratios, namely, 25/100 or 30/100. At equal gloss, the hiding of RT-427-D will always be lower than that of toluldlne. The deficiency in gloss is also apparent when RT-427-O is blended with darker reds in order to obtain EdtLQhsa.jCor .tOluifllJELS red. Thus, fable IX lists a number of toluldlne red matches} in each ease the match is deficient in gloss and more expensive at equal hiding. RT9427-D would have to sell around 60/ to be of Interest in these blends; In each case the color retention would, of course, be inferior* DUP050149751 3 Attempts to obtain a-match for molybdate orange with blends of X-469-D and BT-427-D, results la enamels inferior in gloss, color and pries as Indicated in Table III. X& can storage. BT-A27-P enamels are sometimes subjeot to discoloration (see KS-43-122 and XB-43-123) This is not a serious deterrent to its use and can probably be overcome by proper drier formulation* RT-427-B is a red pigment dyestuff of outstanding durability. This excellent durability is offset by two factors, low opacity and a tendency to inferior gloss* A reduction In price from the present level of 8Q4 to about 604 to 504 mould probably be necessary to make it of interest as a substitute for toluidine red* TAMM It Comparison of Red Toner -......... ..................................................................................................... ''Price# BB Pigment Ratio P/B*100 Oloss Hiding $/gal. for 100 4* -69-16 -69-21 RT-396-D -69-22 w -69-20 -69-1 RT-427-0 --69--3 ** n R W n n -69-19 Guysndot Red" Jb'lhJt 13.3 18.6 25.0 13.6 18.6 25.0 25.0 35.0 25.0 exo. R 'n a ft tt fair poor exc. IS? good *69-5 =*69-4 =69-13 *69-5&21 *69-4&22 good 1.8 1.80 1.37 1.47 1.64 1.61 1.78 1.65 0.70 0.66 0.63 0.51 -- -- This is the price at which RT-427-D would,have to sell in order to compete with RT-386-D (#1,05) and RT-396-D (#0*85) at the indi cated hiding levels* Since hiding power is not a linear function of pigment concentration, the value of the pigment in relation to its hiding power, depends on the level of hiding desired. Pigment/ binder (P/B) ratios of 25/100 to 30/100 are usually considered practical for reds* In & previous study (S-3130), the following relations were found to hold in alkyd enamels. U Pi tmiewb 35-134 Rf-427-0 p/wastry) 33.6 t/gal* 2.07 Competitive Price for RT-4R7^&___ -135 RT-386-D -136 RT-396-0 20*2 20*2 1.97 1.60 0.69 0.59 These values are in moderately good agreement with the foregoing values} the slight discrepancies are due to the difficulty of making accurate hiding power measurements. DU P050149752 S oluidlse Bed Matches - 4- DUP050149753 10th linen ht-nvy DU P050149754