Reactive Dye and Process of Printing Same
A method of printing an ink that comprises reactive dyes as colorants. The ink has at least one cyclodextrin (CD) compound to react with reactive dye molecules, while a hydrophobic cavity is filled with a disperse dye component to create an encapsulation prior to the ink formulation stage. The ink also includes a crosslinking agent that is capable of creating a chemical bonding reaction between the unreacted portion of the hydroxyl functional groups of cyclodextrin (CD), an optional alkaline substance, and other optional ink additives. Permanently bonded color images are provided by the reaction between the chemically altered and colored cyclodextrin (CD) and the final substrate, which may be any cellulosic, protein, or polyamide fiber material, or mixtures with polyester, by the application of energy.
1 . A method of digital printing, comprising the steps of:
a. preparing a liquid reactive ink comprising cyclodextin and reactive dye;
b. supplying a digital printer with said reactive ink;
c. digitally printing said reactive ink on a substrate; and
d. subsequently reacting said ink to bond to said substrate
2 . A method of digital printing as described in claim 1 , wherein said cyclodextrin is chemically modified cyclodextrin.
3 . A method of digital printing as described in claim 1 , wherein said reactive ink further comprises heat activated dye.
4 . A method of digital printing as described in claim 1 , Wherein said reactive ink comprises a crosslinking agent.
5 . A method of digital printing as described in claim 4 , wherein said reactive ink further comprises blocked catalyst.