Provided are methods of fabricating an object, effected by jetting two or more different compositions, each containing a different material or mixture of materials, which, when contacted on a receiving medium, undergo a chemical reaction therebetween to form the building material. The chemical composition of the formed building material is dictated by a ratio of the number of voxels of each composition in a voxel block. Systems for executing the methods, and printed objects obtained thereby are also provided.

Provided are methods of fabricating an object, effected by jetting two or more different compositions, each containing a different material or mixture of materials, which, when contacted on a receiving medium, undergo a chemical reaction therebetween to form the building material. The chemical composition of the formed building material is dictated by a ratio of the number of voxels of each composition in a voxel block. Systems for executing the methods, and printed objects obtained thereby are also provided.

A radiation-curable composition includes at least one monofunctional acrylate monomer and/or methacrylate monomer and/or at least one monofunctional acrylamide monomer, at least one multifunctional acrylate monomer and/or methacrylate monomer and at least one oligomer and/or at least one polymer, wherein the composition at 40° C. has a viscosity of ≥50 mPas, in particular >50 mPas.

A radiation-curable composition includes at least one monofunctional acrylate monomer and/or methacrylate monomer and/or at least one monofunctional acrylamide monomer, at least one multifunctional acrylate monomer and/or methacrylate monomer and at least one oligomer and/or at least one polymer, wherein the composition at 40° C. has a viscosity of ≥50 mPas, in particular >50 mPas.

Methods for forming latexes are provided. In embodiments, such a method comprises adding a first portion of a monomer emulsion comprising water, a monomer, an acidic monomer, a multifunctional monomer, and a first reactive surfactant to a reactive surfactant solution comprising water and a second reactive surfactant to form a reaction mixture, wherein the reactive surfactant solution does not comprise monomers other than the second reactive surfactant; adding a first portion of an initiator solution to the reaction mixture so that monomers undergo polymerization reactions to form resin seeds in the reaction mixture; adding a second portion of the monomer emulsion to the reaction mixture comprising the resin seeds; and adding a second portion of the initiator solution to the reaction mixture to form a latex comprising resin particles.

This invention provides an inkjet ink comprising: an α,β-unsaturated ether monomer in which the only radiation-curable functional groups present in the monomer are α,β-unsaturated ether groups; a tri- or higher functionality (meth)acrylate monomer in which the only radiation-curable functional groups present in the monomer are acrylate groups; and a colouring agent; wherein the ink contains less than 5% by weight of water and volatile organic solvents in total, and less than 10% by weight of mono- and di-functional monomers in total, other than the α,β-unsaturated ether monomer, where the amounts by weight are based on the total weight of the ink, and wherein the ink has a viscosity of less than 100 mPas at 25° C. The ink is particularly suitable for printing onto food packaging.

This invention provides an inkjet ink comprising: an α,β-unsaturated ether monomer in which the only radiation-curable functional groups present in the monomer are α,β-unsaturated ether groups; a tri- or higher functionality (meth)acrylate monomer in which the only radiation-curable functional groups present in the monomer are acrylate groups; and a colouring agent; wherein the ink contains less than 5% by weight of water and volatile organic solvents in total, and less than 10% by weight of mono- and di-functional monomers in total, other than the α,β-unsaturated ether monomer, where the amounts by weight are based on the total weight of the ink, and wherein the ink has a viscosity of less than 100 mPas at 25° C. The ink is particularly suitable for printing onto food packaging.

Disclosed is a composition containing copper particles and organic solvents, in which the organic solvents include a first organic solvent having a vapor pressure at 20° C. of 200 Pa or more and 20 kPa or less, and a second organic solvent having a vapor pressure at 20° C. of 0.5 Pa or more and less than 200 Pa.

Disclosed is a composition containing copper particles and organic solvents, in which the organic solvents include a first organic solvent having a vapor pressure at 20° C. of 200 Pa or more and 20 kPa or less, and a second organic solvent having a vapor pressure at 20° C. of 0.5 Pa or more and less than 200 Pa.

Provided are ink-receptive coating compositions including: (a) an aqueous anionic polyurethane dispersion; and (b) an aqueous solution of a nonionic polyurethane. Methods of coating substrates, and of printing, including providing and/or coating the composition onto a substrate are also provided.