Reactive ink jet ink printing process
View Patent ↗An ink jet printing process in which an image is permanently bound, directly or indirectly, to a final substrate by reaction of the ink with the substrate. An ink jet ink is that is comprised of reactive dyes, direct dyes or combinations thereof are printed according to the process.
1. A method of printing using an ink jet printer consisting of:
a. preparing an ink jet ink comprising:
(1) at least one reactive dye that is capable of forming a covalent bond with a printable substrate,
(2) a liquid carrier, wherein said liquid carrier is selected from the group consisting of water, ketones, esters, alcohols, glycol ethers, glycol ether esters and aromatic hydrocarbons;
(3) an energy activated printing additive that is solubilized in said ink jet ink wherein said energy activated printing additive is a selected from the group consisting of substituted and unsubstituted ureas and;
b. supplying an ink jet printer with said ink jet ink;
c. printing said ink jet ink using said jet printer and forming an image on a printable substrate, wherein said energy activated printing additive solidifies upon evaporation of said liquid carrier;
d. transferring said image to a final substrate by the application of heat to said image at a temperature between about 175° C. and about 212° C.,
whereupon said energy activated printing additive liquefies by the application of said heat to said image, and said reactive dye is solubilized in said energy activated printing additive, and said energy activated printing additive, in a liquid form, facilitates transfer of said image from said printable substrate to said final substrate, and said reactive dye reacts with said final substrate and thereby bonds to said final substrate to form said image on said final substrate.
2. The method of printing using an ink jet according to claim 1 , wherein said final substrate comprises an hydroxyl group, and wherein said hydroxyl group reacts with said reactive dye.
3. The method of printing according to claim 1 , wherein said final substrate comprises cellulose, and wherein said cellulose reacts with said reactive dye.
4. The method of printing according to claim 1 , wherein said ink jet ink comprises an amino group.
5. The method of printing according to claim 2 , wherein said ink jet ink comprises an amino group, and said amino group reacts with said hydroxyl group.
6. The method of printing according to claim 1 wherein said at least one reactive dye contains at least one of the following functional groups: monohalogentriazine, dihalogentriazone, 4,5-dicholopyridazone, 1,4-dichloropyridalazine, 2,4,5-trialogenpyrimidine, 2,3-dichloroquinixaline, 3,6-dichloropyridazone, sulfuric acid ester of β-hydroxyethylsulfome, N-substituted β-aminoethylsulfone, epoxy group and precursor 2-chlor-1-hydroxyethyl, sulfuric acid ester of β-hydroxypropionamide, α,β-dibromopropionamide, phosphonic acid and phosphoric acid ester.
7. The method of printing according to claim 1 wherein said at least one reactive dye contains the monohalogentriazine as a functional group.
8. The method of printing according to claim 1 wherein said liquid carrier is selected from the group consisting of water, ketones, esters, alcohols, glycol ethers, glycol ether esters and aromatic hydrocarbons.
9. The method of printing according to claim 1 wherein said ink jet ink further comprises an alkaline material.
10. The method of printing according to claim 1 wherein said energy activated printing additive is a selected from the group consisting of urea, 1-1-dimethylurea, 1,3-dimethylurea, and ethylurea.
11. The method of printing according to claim 1 wherein said energy activated printing additive is present in an amount of from about 2% to about 25% by weight of said ink jet ink.
12. The method of printing according to claim 1 wherein said final substrate a member of the group consisting of cellulosic, protein or polyamide fiber material.