Treatment of release layer and inkjet ink formulations

Abstract

Aqueous inkjet ink formulations comprising a solvent including water and a co-solvent, a water soluble or water dispersible polymeric resin and a colorant, and a method for facilitating the use of such an aqueous inkjet ink in an indirect printing system in which the ink is jetted onto a hydrophobic release layer of an intermediate transfer member before having the solvent removed therefrom and being transferred to a substrate, wherein prior to the jetting of the ink the release layer is brought into contact with an aqueous solution of a positively charged polymeric chemical agent. Other aspects are also described.

1 - 26 . (canceled) 
     
     
         27 . A hydrophobic release layer of an intermediate transfer member of a printing system having disposed thereupon a polymeric chemical agent having a nitrogen content of at least 1 wt. % and at least one of (a) a nitrogen content of at least 1 wt. %, a positive charge density of at least 3 meq/g of chemical agent and an average molecular weight of at least 5,000, (b) a nitrogen content of at least 1 wt. %, a positive charge density of at least 1 meq/g of chemical agent and an average molecular weight of at least 1000, (c) a nitrogen content of at least 1% and an average molecular weight of at least 50,000, and (d) a nitrogen content of at least 18% and an average molecular weight of at least 10,000. 
     
     
         28 . The release layer of  claim 27 , wherein the chemical agent has an average molecular weight of at least 800, at least 1,000, at least 1,300, at least 1,700, at least 2,000, at least 2,500, at least 3,000, at least 3,500, at least 4,000, at least 4,500, at least 5,000, of at least 10,000, at least 15,000, at least 20,000, at least 25,000, at least 50,000, at least 100,000, at least 150,000, at least 200,000, at least 250,000, at least 500,000, at least 750,000, at least 1,000,000, or at least 2,000,000. 
     
     
         29 . The release layer of  claim 27  the charge density is at least 6 meq/g of chemical agent. 
     
     
         30 . The release layer of  claim 27  wherein the polymer is selected from the group consisting of linear polyethylene imine, branched polyethylene imine, modified polyethylene imine, poly(diallyldimethylammonium chloride), poly(4-vinylpyridine), polyallylamine, a vinyl pyrrolidone-dimethylaminopropyl methacrylamide co-polymer a vinyl caprolactam-dimethylaminopropyl methacryamide hydroxyethyl methacrylate copolymer a quaternized copolymer of vinyl pyrrolidone and dimethylaminoethyl methacrylate with diethyl sulfate a guar hydroxypropyltrimonium chloride, and a hydroxypropyl guar hydroxypropyltrimonium chloride. 
     
     
         31 . The release layer of  claims 27 , wherein the concentration of the chemical agent on the release layer is not more than 50 mg per square meter, not more than 40 mg/m 2 , not more than 30 mg/m 2 , not more than 20 mg/m 2 , not more than 10 mg/m 2 , not more than 5 mg/m 2 , not more than 4 mg/m 2 , not more than 3 mg/m 2 , not more than 2 mg/m 2 , not more than 1 mg/m 2 , not more than 0.5 mg/m 2 , not more than 0.1 mg/m 2 , not more than 0.05 mg/m 2 , or not more than 0.01 mg/m 2 . 
     
     
         32 - 85 . (canceled) 
     
     
         86 . The release layer of  claim 28  wherein the charge density is at least 6 meq/g of chemical agent. 
     
     
         87 . The release layer of  claim 28  wherein the polymer is selected from the group consisting of linear polyethylene imine, branched polyethylene imine, modified polyethylene imine, poly(diallyldimethylammonium chloride), poly(4-vinylpyridine), polyallylamine, a vinyl pyrrolidone-dimethylaminopropyl methacrylamide co-polymer, a vinyl caprolactam-dimethylaminopropyl methacryamide hydroxyethyl methacrylate copolymer, a quaternized copolymer of vinyl pyrrolidone and dimethylaminoethyl methacrylate with diethyl sulfate, a guar hydroxypropyltrimonium chloride, and a hydroxypropyl guar hydroxypropyltrimonium chloride. 
     
     
         88 . The release layer of  claim 29  wherein the polymer is selected from the group consisting of linear polyethylene imine, branched polyethylene imine, modified polyethylene imine, poly(diallyldimethylammonium chloride), poly(4-vinylpyridine), polyallylamine, a vinyl pyrrolidone-dimethylaminopropyl methacrylamide co-polymer, a vinyl caprolactam-dimethylaminopropyl methacryamide hydroxyethyl methacrylate copolymer, a quaternized copolymer of vinyl pyrrolidone and dimethylaminoethyl methacrylate with diethyl sulfate, a guar hydroxypropyltrimonium chloride, and a hydroxypropyl guar hydroxypropyltrimonium chloride. 
     
     
         89 . The release layer of  claim 86  wherein the polymer is selected from the group consisting of linear polyethylene imine, branched polyethylene imine, modified polyethylene imine, poly(diallyldimethylammonium chloride), poly(4-vinylpyridine), polyallylamine, a vinyl pyrrolidone-dimethylaminopropyl methacrylamide co-polymer, a vinyl caprolactam-dimethylaminopropyl methacryamide hydroxyethyl methacrylate copolymer, a quaternized copolymer of vinyl pyrrolidone and dimethylaminoethyl methacrylate with diethyl sulfate, a guar hydroxypropyltrimonium chloride, and a hydroxypropyl guar hydroxypropyltrimonium chloride. 
     
     
         90 . The release layer of  claim 28 , wherein the concentration of the chemical agent on the release layer is not more than 50 mg per square meter, not more than 40 mg/m 2 , not more than 30 mg/m 2 , not more than 20 mg/m 2 , not more than 10 mg/m 2 , not more than 5 mg/m 2 , not more than 4 mg/m 2 , not more than 3 mg/m 2 , not more than 2 mg/m 2 , not more than 1 mg/m 2 , not more than 0.5 mg/m 2 , not more than 0.1 mg/m 2 , not more than 0.05 mg/m 2 , or not more than 0.01 mg/m 2 . 
     
     
         91 . The release layer of  claim 29 , wherein the concentration of the chemical agent on the release layer is not more than 50 mg per square meter, not more than 40 mg/m 2 , not more than 30 mg/m 2 , not more than 20 mg/m 2 , not more than 10 mg/m 2 , not more than 5 mg/m 2 , not more than 4 mg/m 2 , not more than 3 mg/m 2 , not more than 2 mg/m 2 , not more than 1 mg/m 2 , not more than 0.5 mg/m 2 , not more than 0.1 mg/m 2 , not more than 0.05 mg/m 2 , or not more than 0.01 mg/m 2 . 
     
     
         92 . The release layer of  claim 30 , wherein the concentration of the chemical agent on the release layer is not more than 50 mg per square meter, not more than 40 mg/m 2 , not more than 30 mg/m 2 , not more than 20 mg/m 2 , not more than 10 mg/m 2 , not more than 5 mg/m 2 , not more than 4 mg/m 2 , not more than 3 mg/m 2 , not more than 2 mg/m 2 , not more than 1 mg/m 2 , not more than 0.5 mg/m 2 , not more than 0.1 mg/m 2 , not more than 0.05 mg/m 2 , or not more than 0.01 mg/m 2 . 
     
     
         93 . The release layer of  claim 86 , wherein the concentration of the chemical agent on the release layer is not more than 50 mg per square meter, not more than 40 mg/m 2 , not more than 30 mg/m 2 , not more than 20 mg/m 2 , not more than 10 mg/m 2 , not more than 5 mg/m 2 , not more than 4 mg/m 2 , not more than 3 mg/m 2 , not more than 2 mg/m 2 , not more than 1 mg/m 2 , not more than 0.5 mg/m 2 , not more than 0.1 mg/m 2 , not more than 0.05 mg/m 2 , or not more than 0.01 mg/m 2 . 
     
     
         94 . The release layer of  claim 87 , wherein the concentration of the chemical agent on the release layer is not more than 50 mg per square meter, not more than 40 mg/m 2 , not more than 30 mg/m 2 , not more than 20 mg/m 2 , not more than 10 mg/m 2 , not more than 5 mg/m 2 , not more than 4 mg/m 2 , not more than 3 mg/m 2 , not more than 2 mg/m 2 , not more than 1 mg/m 2 , not more than 0.5 mg/m 2 , not more than 0.1 mg/m 2 , not more than 0.05 mg/m 2 , or not more than 0.01 mg/m 2 . 
     
     
         95 . The release layer of  claim 88 , wherein the concentration of the chemical agent on the release layer is not more than 50 mg per square meter, not more than 40 mg/m 2 , not more than 30 mg/m 2 , not more than 20 mg/m 2 , not more than 10 mg/m 2 , not more than 5 mg/m 2 , not more than 4 mg/m 2 , not more than 3 mg/m 2 , not more than 2 mg/m 2 , not more than 1 mg/m 2 , not more than 0.5 mg/m 2 , not more than 0.1 mg/m 2 , not more than 0.05 mg/m 2 , or not more than 0.01 mg/m 2 . 
     
     
         96 . The release layer of  claim 89 , wherein the concentration of the chemical agent on the release layer is not more than 50 mg per square meter, not more than 40 mg/m 2 , not more than 30 mg/m 2 , not more than 20 mg/m 2 , not more than 10 mg/m 2 , not more than 5 mg/m 2 , not more than 4 mg/m 2 , not more than 3 mg/m 2 , not more than 2 mg/m 2 , not more than 1 mg/m 2 , not more than 0.5 mg/m 2 , not more than 0.1 mg/m 2 , not more than 0.05 mg/m 2 , or not more than 0.01 mg/m 2 .