INK JET PRINTING METHOD FOR HIGH WATERFASTNESS AND LIGHT-FASTNESS ON PRINTED IMAGES
Original Publication Date: 1987-Aug-31
Included in the Prior Art Database: 2004-Apr-04
Xerox Disclosure Journal
Compositions for ink jet printing processes wherein the waterfastness and lightfastness components are separated by formulating, in addition to the ink, an aqueous transparent fluid. The aforementioned inks, which can be utilized to generate images on paper or transparencies, contain for example dyes, biocides, chelating materials, a buffer solution, water, and optional additives such as humectants and dye solubilizers. Subsequent to development there is applied to the printed paper or transparency an aqueous transparent fluid containing polyethyleneimine, an ultraviolet light absorber such as benzotriazoles, and an antioxidant such as an alkylhydroquinone. Use of the two separate com onents as illustrated enable improved lightfastness, and a reduction in the c P ogging of the ink jet orifices.