An electrically conductive screen-printable PTC ink composition with low inrush current and high NTC onset temperature, consisting of at least two different polymers, polymer-1 and polymer-2; wherein the melting temperature difference between polymer-1 and polymer-2 must be greater than 50 C., and the mechanical strength of polymer-1 as expressed by Young's modulus must be greater than 200 MPa.

In one inventive concept, an ink includes a precursor of a graphene analogue, a thickener, and a solvent. In another inventive concept, an ink includes a graphene analogue, a thickener, and a solvent. In yet another inventive concept, an aerogel includes a three-dimensional printed structure having printed features comprised of two dimensional sheets of a graphene analogue.

A process for forming a conductive hemp-based ink comprising carbonizing hemp and reducing the particle size of said hemp via a milling process to between 2 and 5 microns, wherein said reduced size hemp particles are combined with at least one aqueous carrier to produce an ink, and wherein said ink is conductive.

A process for forming a conductive hemp-based ink comprising carbonizing hemp and reducing the particle size of said hemp via a milling process to between 2 and 5 microns, wherein said reduced size hemp particles are combined with at least one aqueous carrier to produce an ink, and wherein said ink is conductive.

The present invention provides an active energy ray-curable ink composition for offset printing which can maintain excellent drying characteristics with a small dose of UV light. An active energy ray-curable ink composition for offset printing comprising a compound having an ethylenically unsaturated bond, a photopolymerization initiator, and an epoxidized fat or oil is used. Although epoxidized fat or oil is not polymerized through radical polymerization, the present inventors, who have conducted research, have revealed that the reactivity of a radically polymerizable ink composition is increased through addition of epoxidized fat or oil thereto.

The present invention provides an active energy ray-curable ink composition for offset printing which can maintain excellent drying characteristics with a small dose of UV light. An active energy ray-curable ink composition for offset printing comprising a compound having an ethylenically unsaturated bond, a photopolymerization initiator, and an epoxidized fat or oil is used. Although epoxidized fat or oil is not polymerized through radical polymerization, the present inventors, who have conducted research, have revealed that the reactivity of a radically polymerizable ink composition is increased through addition of epoxidized fat or oil thereto.

The present invention relates to [1] a water-based ink containing water-insoluble polymer particles (A), an organic solvent (B) and water, in which a polymer constituting the water-insoluble polymer particles (A) is in the form of a crosslinked polymer; the organic solvent (B) contains a polyhydric alcohol ether; and a rate of change in viscosity of the organic solvent (B) as calculated according to the formula (1) is not more than 140%, and [2] a printing method of printing characters or images on a printing medium using the water-based ink described in the above [1], in which a water absorption of the printing medium per a unit surface area thereof as measured by contacting the printing medium with pure water for 100 milliseconds is not less than 0 g/m.sup.2 and not more than 10 g/m.sup.2.

The present invention relates to [1] a water-based ink containing water-insoluble polymer particles (A), an organic solvent (B) and water, in which a polymer constituting the water-insoluble polymer particles (A) is in the form of a crosslinked polymer; the organic solvent (B) contains a polyhydric alcohol ether; and a rate of change in viscosity of the organic solvent (B) as calculated according to the formula (1) is not more than 140%, and [2] a printing method of printing characters or images on a printing medium using the water-based ink described in the above [1], in which a water absorption of the printing medium per a unit surface area thereof as measured by contacting the printing medium with pure water for 100 milliseconds is not less than 0 g/m.sup.2 and not more than 10 g/m.sup.2.

The present invention relates to [1] a water-based pigment dispersion formed by dispersing a pigment in a water-based medium with a polymer dispersant, in which the polymer dispersant contains a (meth)acrylic resin (A) and a resin (B); and the resin (B) is at least one resin selected from the group consisting of a polyester resin (B1), an acid-modified polyolefin resin (B2) and a vinyl chloride-based resin (B3), and [2] a process for producing a water-based pigment dispersion, including the following steps 1 and 2: Step 1: subjecting a pigment mixture containing a pigment, an acid group-containing (meth)acrylic resin (A), and a resin (B) which is at least one resin selected from the group consisting of a polyester resin (B1), an acid-modified polyolefin resin (B2) and a vinyl chloride-based resin (B3) to dispersion treatment to obtain a dispersion; and Step 2: subjecting the dispersion obtained in the step 1 to crosslinking treatment with a crosslinking agent (C).

The present invention relates to [1] a water-based pigment dispersion formed by dispersing a pigment in a water-based medium with a polymer dispersant, in which the polymer dispersant contains a (meth)acrylic resin (A) and a resin (B); and the resin (B) is at least one resin selected from the group consisting of a polyester resin (B1), an acid-modified polyolefin resin (B2) and a vinyl chloride-based resin (B3), and [2] a process for producing a water-based pigment dispersion, including the following steps 1 and 2: Step 1: subjecting a pigment mixture containing a pigment, an acid group-containing (meth)acrylic resin (A), and a resin (B) which is at least one resin selected from the group consisting of a polyester resin (B1), an acid-modified polyolefin resin (B2) and a vinyl chloride-based resin (B3) to dispersion treatment to obtain a dispersion; and Step 2: subjecting the dispersion obtained in the step 1 to crosslinking treatment with a crosslinking agent (C).