Heat Activated Dyes for Improved Waterfastness on Paper
Original Publication Date: 1980-Jun-01
Included in the Prior Art Database: 2005-Feb-13
In an effort to develop water-soluble and yet waterfast dyes for ink jet printing technologies, we have prepared heat-activated polyphosphonate dyes. It was previously known that textile dyes containing a single phosphonate moiety could be heat-activated to covalently bind to cellulosic fabrics, resulting in very high wash fastness. We have discovered that these dyes can be heat-activated to bind covalently to paper; however, the requisite activation temperature and time are beyond those conditions considered practical for use in ink jet technologies. To improve the performance of this system, we have synthesized novel polyphosphonate dyes in which a dye is linked to a polyphosphonate backbone via a phosphonamide linkage.