Provided are an ink composition including water, particles including a polymer having at least one selected from the group consisting of a urethane group and a urea group, and a gelling agent having a hydrogen-bonding group; a method for producing the ink composition; and an image-forming method.

Provided are an ink composition including water, particles including a polymer having at least one selected from the group consisting of a urethane group and a urea group, and a gelling agent having a hydrogen-bonding group; a method for producing the ink composition; and an image-forming method.

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 curable composition containing: a methylene malonate compound; a 2-cyanoacrylate compound; and a Lewis acidic compound. The methylene malonate compound is preferably a compound represented by formula (1) or formula (2). In the formulae (1) and (2), X.sup.1 to X.sup.4 each independently represent O, NR, or C(R).sub.2, R's each independently represent a hydrogen atom, an alkyl group, or an aryl group, R.sup.1 and R.sup.2 each independently represent an alkyl group or an aryl group, and R.sup.3 represents an alkylene group, an arylene group, or a group obtained by combining two or more of these groups.

##STR00001##

A curable composition containing: a methylene malonate compound; a 2-cyanoacrylate compound; and a Lewis acidic compound. The methylene malonate compound is preferably a compound represented by formula (1) or formula (2). In the formulae (1) and (2), X.sup.1 to X.sup.4 each independently represent O, NR, or C(R).sub.2, R's each independently represent a hydrogen atom, an alkyl group, or an aryl group, R.sup.1 and R.sup.2 each independently represent an alkyl group or an aryl group, and R.sup.3 represents an alkylene group, an arylene group, or a group obtained by combining two or more of these groups.

##STR00001##

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.

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.