Document zQBx4Q7Oj1V8jKrm9xBO3MbD3

RETURN TB MARSHALL L "INDBCED" P,1Y15'5| *1 Wito..': t ",, f , ;j ^ iif K& (L^a y iu i Indexed 00s J. B. Bullitt, WUtt.P-70l6 J. D. isBurney,wil .P~70l2 R. 1. Thomas, Newburgh . W, f. F1sher,Wilts *1)-8020 E. A, Rodman, Newburgh J. D. Pickens, Flint ft* Morgan, Lab, R. B. Bavis, hah. P. Robinson, tab. P. B. Evans, tab. 0. R, E, Merkle, Lab, A, 0. Buck, Lab. D, L, Herndon, Lab. <2T. H. Lowell, Lab. B. A. Morehead, Lab, S. 0. Horning, Lab. (2) S. Hoehberg, Lab. S. L. odsheik, Lab. K. C. Lamport, Lab, R* L, Selby, Lab, (2) H. 3. Stuart, Lab. 11. A, Hall, Lab. 0, H, Bullitt, Jr., Exp. Sta Marshall Lab. Library (5) Patent Section, Lab. Files 1810 Marshall Laboratory Flay 12, 1953. me mo r a n d u m r e p o r t n o . 1-582 Prepared by: J, P. Serroattel II,V, LIGHT ABSORBERS IN FBRNITOE LACQUERS VISIT TO HERCULES SKPERIMENTAL STATION* WILTOGTON imOBBOTIQNs This visit was igade on May ^ with Messrs, j. F. Gonlon and H, B, Wagner to discuss Hercules* work with B.V. light absorbers in furniture lacquers. PERSONS mwmSHED: Mr, D. Lesser, Chemist Nr. E, G Hamilton, Chemist . Mr. R* F. Hint, Sales Development mmm* ~2- In nitrocellulose furniture lacquers, Uvinul 400 and Uvinul 490 were found to be the raost effective for preventing wood discoloration resulting from sunlight exposure of lacquered wood panels* Uvinul 400 was effective at a concentration of 0.75$* end Uvinul 490 at a concentration of 0.5% of the fils solids* when tested at a film thickness of 3 wile* While the Uvinuls appear to be the best of the available U.V. light absorbers for use in clear furniture lacquers* they are subject to certain limitations. the store important of. which are* (!) High cost - Uvinul 400 is $11.50 per pound and Uvinul 490 is $12,-75 per pound* (B) 'They are effective in preventing discoloration of some woods but not others* For example* they are effective over yellow birch and maple* but are not effective over bleached mahogany* white oak and black walnut* Hercules will send us more detailed data covering the effectiveness of the tfvtnuls over various kinds of wood* (0) Uvinul 490 imparts a slight yellow color to the lacquer film and this will probably be objectionable- over very light colored woods or white substrates* According to Hercules* the Urinals are not effective in stabilising the color of the nitrocellulose film* itself* on exposure to sunlight* but are only effective In preventing discoloration of the wood underneath. However* j. F Conicm has found that Uvinul 400 is also effective in preventing the discoloration of a free-nitrooellulose film on exposure to U.V. light* provided that a sufficient concentration of the TJvlnul 400 is used. UvlnuX 400 also imparts no appreciable initial color to the film* being definitely better in this respect than UvlnuX 400, Uvinul 400* therefore* appears to have acre generally useful overall properties than Uvlnul 490* except that higher concen tration must be used for equal effectiveness* .In general* the Uvinuls appear to be interesting compounds for Improving the stability and durability of films subject to sunlight exposure* Aggro* X* <, F. Oonlon will test UVinuls 400 and 490 in nitrocellulose lacquers over several woods.. 2. %.* B. Wagner has work in progress aimed .at improving blister DUP030003510 -33 resistance and durability of finishes through the use of the Uvinuls. DISCUSSIONt ' Uvinuls 400 and 490 are commercially available from Antara Chemicals* Division of General Dyestuff Corporation, 435 Hudson St, Hew York. Uvinul 400 is bensoyl resorcinol, and Uvinul 490 is described as a substituted benssophenohe. Uvinul 400 is disclosed in U. S. Patent 2,568,894. Uvinul 400 is practically colorless and imparts no appreciable color to films In which it is incorporated. Uvinul 490, on the other hand, is a tan powder and imparts a slight yellow color to films. Both Uvinuls 400 and 49 show strong absorption characteristics for U.T. light In the range 3000 to 3800 Angstrom unit, normal types of window glass filter out wavelengths below 3000 Angstroms, and the range 3000 to 3800 is believed to cause most wood discoloration indoors. Both Uvinuls have exceptionally good stability to Continued exposure to sunlight and they also re stable to temperatures up to 210C. for several hours. They are soluble in alcohols and insoluble in water end aliphatic hydrocarbons. Hercules tested the Uvinuls in the following film composition ) that was designed to have good inherent light stability% 1/2 second R.S. nitrocellulose 5$ Oe'llo'iyn 502 (a PE coeoamutoil alkyd) 35$ 'Dibutyl phthalate Total 15$ 100$ Uvinul 400 was tested at a concentration of .75$ of the film and Uvinul 490 was tested at a concentration of .5$. The lacquers were applied over many woods at a film thickness of 3 mils. These panels were then exposed under glass at 45 S. for 15 days, with controls that did not contain the Uvinuls. The test panels shown us indicated that the Uvinuls were quite effective in preventing wood discoloration In numerous cases, although there were also many woods where no bene~ flclsl effect was obtained. The lacquer film Itself was first tested for yellowing by applying It to whit procelain and exposing to sunlight under the same conditions as the wood panels, j. F. Conion0 s work has shown that concentrations rough higher DUP030003511 than ,5 and *75$ were needed to obtain the improvements claimed for the Uvlnuls, This difference in results is probably due to the fact that Conlonss tests were made at lower flits thicknesses and that he was looking for effects in the films as much as for effects in the wood* Other suggested uses for the Uvinuls are as tf.V. light absorbers ins (a) Transparent shades for store windows to protect merchandise from fading. (b) Paper*leather and textiles to protect from deterioration* (e) Sun oils* creams and lotions* (d) Floor and furniture polishes and waxes* (e) Adhesives (f) Plasties 3. F,, Conlon has data sheets giving more detailed information on the Uvinuls. JFSsltm 5/11 MARSHALL LABORATORY * P9 SESMTTEi DUP030003512