Document LKaKj6VgbKzG0mKamLdEq4KK3

cfiUBJ) tSTAIUSMEDMOZ E. I. d u Po n t d e Ne mo u r s 51 Co mpa n y in c o r po r at ed Wil min g t o n , De l aw a r e 19898 CHEMICALS AND PIGMENTS DEPARTMENT JACKSON LABORATORY R. S. Weis, B-1.7202 January 28, 1983 J. G. ISHIKAWA C&P B-16234 RESEARCH ACCOMPLISHMENTS Attached is the text and detail list on "New Quinacridone Pigments for High Solids Enamels." PAW/jmg Attachment N 26958 NEW QUINACRIDONE PIGMENTS FOR HIGH SOLIDS ENAMELS Current automotive grade quinacridone products were developed for optimum performance in the low solids lacquers and enamels in use during the 1970's. Since 1980, automotive paint manufacturers have been developing new high solids enamel systems that minimize solvent discharge to the atmosphere to comply with existing and pending governmental regulations. Many of our most important quinacridone products cannot be used in high solids enamels because they contribute to high paint viscosity and poor film aesthetics. Du Pont has found that the rheological performance of quinacridone pigments can be significantly improved by controlling the size, size distribution, shape and surface polarity of the pigment particles. A unique process for particle size control has been developed in which very small pigment particles of high surface energy are grown, under shear (milling) in the presence of a solvent/ water emulsion, to a nonacicular particle of optimum size and narrow size distribution. Pigments produced by this new technology have provided a 10-fold reduction in paint viscosity vs. conventional products. This reduction in viscosity translates into improved paint yields and a significantly improved paint film aesthetics. The first quinacridone product made by this process will be commercialized in 2Q 1983. P. A. Wriede/jg January 28, 1983 DUP050146119 RESEARCH ACCOMPLISHMENTS AND MAJOR PROGRAMS STATUS Year of Accomplishment or Date of Last Revision 1982 Department Chemicals & Pigment Technology Area y __ ____ . ___ ____ ___ Chemical Process Electronics Life Sciences Polymers Petroleum Coal Other Accomplishment Classification x New Product . x New Process ___ New Product Application ___ Scientific Contribution ___ Environmental Quality Related Major Businesses (up to three) Automotive Finishes (F&FP) Co for Turther Dr.t 1 y' r, .. -i ^ A\ ) (Location) (Phone) Jackson Laboratory 299-3715 Timing of Business Significance x ' 2 Years 2-5 Years ____ 5 Years Significances Outstanding Important Useful Little Scientific _____________ _____________ x ___________ Business ___________ x ___________ ________ __ N 26958.02 DUP050146120 Patent Status Inventors Named on Application Publication Status Authors on Papers Information Restriction Granted x Filed No Application E. E. Jaffe _____ _____ _____ y ____ Published Submitted Being Written Not Appropriate Secret ________________ ______ ________ y _____ Du Pont only Open PAW/jmg 1/28/83 DUP050146121