Document 3QyNbEx3X35QyKvY2OEDDZGv6

6$ INDEXED" By 18'53 CROSS MBBBHCB8: American*4Lb 6. , O*0 kaa^i^C (/ KBUQBflTromi r e p o r t iite-3.93 Ms. 3Tohn Marshall, Wilm, D-7014 Mr, J. B. Bullitt, Lab, Mr, C, R. E. Merkle, Lab, Dr, Paul Robinson, Lab, (2) Philadelphia Laboratory April 28, 1948 COPY mo t mu mcmmu' EVALUATION OF TRIPHENYL PHOSPHITE IN CLEAR VARNISHES TO IMPROVE COLOR This memorandum coders the results obtained in the laboratory with the use of Triphenyl Phosphite in air dry and bak ing varnishes to improve color, This evaluation was undertaken because of a letter written by W. P, Colio to V. V/. Iliff on November 13, 1947 recording his observations at a convention of the Federation of Paint and Varnish' Production Clubs in Atlantic City, and in which he stated that the subject ester is being used to improve the color of varnishes, Thn theory.behind this was the conversion of any iron present by the phosphite to colorless salts, VC-791 Beer Can Base Coat: We added several amounts of Triphenyl Phosphite, rang ing from 0,05$ to 0.5$ on the varnish solids, to standard VC-791 (selected because it is rich in iron) and baked on the regular schedule of 10 mis. x 410F,, over white coated tinplate. An examination of the baked films indicate that the introduction of Triphenyl Phosphite to VO-791 does not improve the color of that product, MAC-271 (PVKP-65348) Processing Finishing Varnlaht To MAC-271 we added Triphenyl Phosphite ranging from 0,05$ to 2.0$ on the varnish solids, and after baking 10 min, x 3356F over white coated tinplate, m examined the baked films for color and hardness. No differences in color or hardness ware observed, excepting in the case where the 2,0$ amount was used, and there w did notice a very slight improvement in color but also a slightly softer film, VC-1361 Navalite Spar Varnish; Based on the results we obtained with the use of Triphenyl Phosphite in VC-791 and MAC-271, m added 1,0$ of this ester to VC-13Cl and observed for color, after 18 hrs. air dry la the Constant Temperature Room, An examination of the films over white coated tinplate failed to show any Improvement in color when Triphenyl Phosphite is used. -- S Conclusions: The above results indicate that no color advantage could be gained with the use of Triphenyl Phosphite in either bak ing or air dry varnishes, when used in amounts below 2.0% on the varnish solids. YJhen the 2.0% amount la used, a very slight color improvement is evident, but the improvement isnot great enough to warrant the use of this phosphite. Also, this very slight im provement in color is accompanied by a slight loss in hardness of the film. Ho further work is recommended with this agent in Clears. PHILADELPHIA LABORATORY J7iH:hfm DUP030003070