Leuco Dye System for Ink Jet Printing
Original Publication Date: 1980-Sep-01
Included in the Prior Art Database: 2005-Feb-13
Improved archival properties for ink used in ink jet printing can be attained by using leuco or vat dyes. Such dyes convert to their permanent form when oxidized. Accordingly, the record medium is first coated or impregnated with an oxidizing agent such as acidic materials, for example, acidified clays, organic acids or polymeric phenols. Upon combining with the oxidant, the dyes convert to their permanent form, becoming insoluble and having high tinctorial strength and excellent archival properties, such as water fastness and light fastness.