An object is to provide a nonaqueous inkjet ink composition offering excellent solid filling property and anti-mottling property, as well as excellent ink stability, discharge stability, and scratch resistance, even when printed at high speed on printing targets whose printing face is constituted by a polyvinyl chloride, ethylene-vinyl acetate-based copolymer, or other vinyl-based polymer, etc. As a solution, a nonaqueous inkjet ink composition is provided that contains acrylic-based resin, organic coloring pigment and/or carbon black, alumina, pigment dispersant, and organic solvent, wherein the organic solvent comprises propylene carbonate, diethylene glycol dialkyl ether, and dipropylene glycol alkyl ether acetate, and alumina is contained by 5 to 30 parts by mass relative to 100 parts by mass representing the total of organic coloring pigment and carbon black.

The present disclosure provides a monolithic inkjet printhead for ejecting a set of ink compositions, wherein the printhead comprises at least one substrate and the substrate comprises a plurality of ejectors each comprising: (i) a nozzle, (ii) a chamber for receiving an ink composition of the set, wherein said chamber is in fluid communication with said nozzle, and (iii) a piezoelectric actuator coupled to said nozzle for selectively ejecting said ink composition therefrom, wherein each ejector is configured to eject ink droplets of the different ink compositions with corresponding volume and velocity. The disclosure further provides a set of ink compositions per se with matched values of viscosity, density and surface tension, a printing apparatus, and methods thereof.

The present disclosure provides a monolithic inkjet printhead for ejecting a set of ink compositions, wherein the printhead comprises at least one substrate and the substrate comprises a plurality of ejectors each comprising: (i) a nozzle, (ii) a chamber for receiving an ink composition of the set, wherein said chamber is in fluid communication with said nozzle, and (iii) a piezoelectric actuator coupled to said nozzle for selectively ejecting said ink composition therefrom, wherein each ejector is configured to eject ink droplets of the different ink compositions with corresponding volume and velocity. The disclosure further provides a set of ink compositions per se with matched values of viscosity, density and surface tension, a printing apparatus, and methods thereof.

An aqueous inkjet ink of the present disclosure is an active energy ray curable aqueous inkjet ink including a water-soluble monomer having a polymerizable group and a hydrazide compound. The water-soluble monomer is a curable substance having a ketone structure.

An aqueous inkjet ink of the present disclosure is an active energy ray curable aqueous inkjet ink including a water-soluble monomer having a polymerizable group and a hydrazide compound. The water-soluble monomer is a curable substance having a ketone structure.

An oil-based inkjet ink composition containing a pigment, a solvent, a binder resin and a pigment-dispersing agent. The solvent contains a higher fatty acid alkyl ester compound having 12-30 carbon atoms and contains substantially no mineral oil. The binder resin is an acrylic resin and/or a chlorinated polypropylene resin. The composition has a viscosity of 2 mPa.Math.s to 30 mPa.Math.s (at 25 C.). The oil-based inkjet ink composition contains substantially no mineral oil, and is excellent in terms of ejection stability, low volatility and suppressing a decrease in OD value.

An oil-based inkjet ink composition containing a pigment, a solvent, a binder resin and a pigment-dispersing agent. The solvent contains a higher fatty acid alkyl ester compound having 12-30 carbon atoms and contains substantially no mineral oil. The binder resin is an acrylic resin and/or a chlorinated polypropylene resin. The composition has a viscosity of 2 mPa.Math.s to 30 mPa.Math.s (at 25 C.). The oil-based inkjet ink composition contains substantially no mineral oil, and is excellent in terms of ejection stability, low volatility and suppressing a decrease in OD value.

The present invention relates to preparation and use of biocompatible and electrically conductive 3D hydrogels comprising nanocellulose fibrils, such as disintegrated bacterial nanocellulose, plant derived nanocellulose, tunicate derived nanocellulose, or algae derived nanocellulose, together with carbon nanotubes or graphene oxide, as a biocompatible and conductive 3D hydrogel for diagnostics and intervention to mimic or restore tissue and organ function. Biocompatible conductive 3D hydrogels described in this invention can be extruded, casted or injected. The 3D hydrogels described in this invention are cohesive 3D structures and provide electrical conductivity in wet form. 3D hydrogels described in this invention can be further crosslinked using divalent ions such as Calcium ions which improve mechanical stability. Such crosslinking can take place in an animal or human body in a physiological environment after injection into the tissue. 3D hydrogels are biocompatible and show preferable mechanical properties and electrical conductivity through printed lines (4.10.sup.1 S cm.sup.1). The 3D hydrogels prepared by this invention are suited as bioassays to screen drugs against neurodegenerative diseases such as Alzheimer's and Parkinson's, study brain function, and/or be used to link the human brain with electronic and/or communication devices. They can also be injected to replace neural tissue or stimulate guiding of neural cells. They can also be used to inject into the heart and stimulate the heart by using electrical signaling or to repair myocardial infarction.

The present invention relates to preparation and use of biocompatible and electrically conductive 3D hydrogels comprising nanocellulose fibrils, such as disintegrated bacterial nanocellulose, plant derived nanocellulose, tunicate derived nanocellulose, or algae derived nanocellulose, together with carbon nanotubes or graphene oxide, as a biocompatible and conductive 3D hydrogel for diagnostics and intervention to mimic or restore tissue and organ function. Biocompatible conductive 3D hydrogels described in this invention can be extruded, casted or injected. The 3D hydrogels described in this invention are cohesive 3D structures and provide electrical conductivity in wet form. 3D hydrogels described in this invention can be further crosslinked using divalent ions such as Calcium ions which improve mechanical stability. Such crosslinking can take place in an animal or human body in a physiological environment after injection into the tissue. 3D hydrogels are biocompatible and show preferable mechanical properties and electrical conductivity through printed lines (4.10.sup.1 S cm.sup.1). The 3D hydrogels prepared by this invention are suited as bioassays to screen drugs against neurodegenerative diseases such as Alzheimer's and Parkinson's, study brain function, and/or be used to link the human brain with electronic and/or communication devices. They can also be injected to replace neural tissue or stimulate guiding of neural cells. They can also be used to inject into the heart and stimulate the heart by using electrical signaling or to repair myocardial infarction.

Electrically conductive ink compositions are provided that comprise at carbon nanomaterials of one-dimensional, two-dimensional, and quasi-three-dimensional nanostructures and/or their combinations, and/or doping with elements such as nitrogen, boron, sulfur, in certain ratios. The carbon nanomaterials are selected from the group consisting of graphene and graphene oxide particles, carbon nanotubes, and graphene aerosol gels.