Ink compositions and methods of use for reliably printing on alkaline and readily oxidizing surfaces comprise one or more pigments, one or more solvents for adjusting viscosity, surface tension, and/or heat tolerance, and water, the pigments being “loaded” in the ink sufficiently to meet the relevant color and optical density requirements for the ink while such ink composition still also meets the duty cycle requirements of the application.

Ink compositions and methods of use for reliably printing on alkaline and readily oxidizing surfaces comprise one or more pigments, one or more solvents for adjusting viscosity, surface tension, and/or heat tolerance, and water, the pigments being “loaded” in the ink sufficiently to meet the relevant color and optical density requirements for the ink while such ink composition still also meets the duty cycle requirements of the application.

The present invention relates to a formulation containing at least one organic functional material and at least three different organic solvents, selected from at least two different organic solvents A and at least one organic solvent B, wherein at least one organic solvent A has a boiling point in the range from 250 to 350° C. and a viscosity of ≥15 mPas, the at least one organic solvent B has a boiling point in the range from 200 to 350° C. and a viscosity of ≤10 mPas, and the solubility of the at least one organic functional material in the second organic solvent B is ≥5 g/l; as well as to electroluminescent devices prepared by using these formulations.

The present invention provides an aqueous ink comprising one or more film forming agents, wherein the total film forming agent concentration in the aqueous ink is from 0.1 to 30 wt. %, and optionally one or more emulsifiers, preferably wherein the total emulsifier concentration in the aqueous ink is from 0.1 to 10 wt. %. The one or more emulsifiers, if present, are fatty acid esters of polyalkoxylated sorbitan and/or the one or more film forming agents fulfil at least one of the following properties: a Young modulus of at least 2 GPa, and a nano hardness of at least 0.08 GPa. Also provided is a use thereof for inkjet printing, preferably on a corrugated board or on a liner for the production of corrugated board.

The present invention provides an aqueous ink comprising one or more film forming agents, wherein the total film forming agent concentration in the aqueous ink is from 0.1 to 30 wt. %, and optionally one or more emulsifiers, preferably wherein the total emulsifier concentration in the aqueous ink is from 0.1 to 10 wt. %. The one or more emulsifiers, if present, are fatty acid esters of polyalkoxylated sorbitan and/or the one or more film forming agents fulfil at least one of the following properties: a Young modulus of at least 2 GPa, and a nano hardness of at least 0.08 GPa. Also provided is a use thereof for inkjet printing, preferably on a corrugated board or on a liner for the production of corrugated board.

An ink contains water, an organic solvent, a polyurethane resin, and a cyclic ester including a structure represented by Chemical formula I, wherein the proportion of the cyclic ester having a crystal having a particle diameter of 1 μm or greater is less than 4 ppm of the total of the ink after the ink is allowed to stand at a temperature range of from 20 to 30 degrees C. for 30 days. ##STR00001##

An ink contains water, an organic solvent, a polyurethane resin, and a cyclic ester including a structure represented by Chemical formula I, wherein the proportion of the cyclic ester having a crystal having a particle diameter of 1 μm or greater is less than 4 ppm of the total of the ink after the ink is allowed to stand at a temperature range of from 20 to 30 degrees C. for 30 days. ##STR00001##

A method of preparation of a gold electrode, which includes the steps of: a) inkjet printing on a substrate an ink including gold nanoparticles functionalized with a compound Cap of formula (I) HS-A-Polyalkylene glycol (I), wherein A is a bound or an alkyl chain having 1 to 12 carbon atoms and wherein polyalkylene glycol is polyethylene glycol, polypropylene glycol or a mixture thereof; and b) annealing printed ink, wherein the compound Cap has an average molar mass of less than 500 g/mol, preferably an average molar mass of about 200 g/mol. Also, an electrode obtainable by the method of the invention, a sensor including the electrode and the use of the sensor.

A method of preparation of a gold electrode, which includes the steps of: a) inkjet printing on a substrate an ink including gold nanoparticles functionalized with a compound Cap of formula (I) HS-A-Polyalkylene glycol (I), wherein A is a bound or an alkyl chain having 1 to 12 carbon atoms and wherein polyalkylene glycol is polyethylene glycol, polypropylene glycol or a mixture thereof; and b) annealing printed ink, wherein the compound Cap has an average molar mass of less than 500 g/mol, preferably an average molar mass of about 200 g/mol. Also, an electrode obtainable by the method of the invention, a sensor including the electrode and the use of the sensor.

An ink set includes a non-white ink composition and a white ink composition, and the non-white ink composition and the white ink composition are each an aqueous ink jet ink. The non-white ink composition contains a silicone-based surfactant A having a maximum peak within a molecular weight range of 3,000 to 20,000 within a molecular weight range of 300 or more in a molecular weight distribution in gel permeation chromatography, and the white ink composition contains a silicone-based surfactant B having a HLB value of 10.5 or less by Griffin method, but not having a maximum peak within a molecular weight range of 3,000 or more within a molecular weight range of 300 or more in a molecular weight distribution in gel permeation chromatography.