A process for producing a three-dimensional object by selectively layer-by-layer solidification of a powdery material layer at the locations corresponding to the cross-section of the object in a respective layer by exposure to electromagnetic radiation. The powdery material comprises at least one polymer which is obtainable from its melt only in substantially amorphous or completely amorphous form, or a polyblend which is obtainable from its melt only in substantially amorphous or completely amorphous form. The powdery material has a specific melting enthalpy of at least 1 J/g.

There is provided a decorative sheet which has satisfactory heat-shielding properties and can exhibit a design which is excellent in the degree of darkness. The decorative sheet includes an infrared-reflective substrate, and a decorative layer disposed on the substrate and including a solid printing layer and a picture layer, wherein the solid printing layer contains an infrared-transparent or infrared-reflective pigment and a binder resin, the infrared-transparent or infrared-reflective pigment containing (A) at least three compounds selected from the pigment group consisting of a quinacridone, an isoindolinone, a nickel azo complex and a phthalocyanine, or (B) at least one compound selected from the pigment group consisting of a composite oxide containing manganese and at least one metal element other than manganese, an azomethine-azo compound and a perylene compound, and wherein the picture layer at least partly contains carbon black and a binder resin.

There is provided a decorative sheet which has satisfactory heat-shielding properties and can exhibit a design which is excellent in the degree of darkness. The decorative sheet includes an infrared-reflective substrate, and a decorative layer disposed on the substrate and including a solid printing layer and a picture layer, wherein the solid printing layer contains an infrared-transparent or infrared-reflective pigment and a binder resin, the infrared-transparent or infrared-reflective pigment containing (A) at least three compounds selected from the pigment group consisting of a quinacridone, an isoindolinone, a nickel azo complex and a phthalocyanine, or (B) at least one compound selected from the pigment group consisting of a composite oxide containing manganese and at least one metal element other than manganese, an azomethine-azo compound and a perylene compound, and wherein the picture layer at least partly contains carbon black and a binder resin.

Provided is a curable ink composition, in particular a curable inkjet ink composition. The ink composition has a dye monomer, a carrier monomer and an initiator. The dye monomer has a chromophore moiety that is covalently bonded to at least one polymerizable functional group and is present at 1.0 wt % or more based on total weight of the ink composition. The carrier monomer has at least one polymerizable functional group and is present in at 50 wt % or more based on total weight of the ink composition. The ink compositions are suitable for radiation curing such as UV curing and have good cure properties or light fastness properties.

Provided is a curable ink composition, in particular a curable inkjet ink composition. The ink composition has a dye monomer, a carrier monomer and an initiator. The dye monomer has a chromophore moiety that is covalently bonded to at least one polymerizable functional group and is present at 1.0 wt % or more based on total weight of the ink composition. The carrier monomer has at least one polymerizable functional group and is present in at 50 wt % or more based on total weight of the ink composition. The ink compositions are suitable for radiation curing such as UV curing and have good cure properties or light fastness properties.

Systems and methods for producing a reversible hemiaminal or aminal gel composition for use in 3D printing, the method including preparing a liquid precursor composition, the liquid precursor composition operable to remain in a first liquid state at about room temperature, where the liquid precursor composition comprises: an organic amine composition; an aldehyde composition; a polar aprotic organic solvent; and a carbon nanomaterial; heating the liquid precursor composition to transition from the liquid state to a gel state; transitioning the gel state to a second liquid state; and 3D printing a solid carbon nanomaterial object comprising a solid printed gel from the second liquid state with a pre-determined orientation for the carbon nanomaterial.

Systems and methods for producing a reversible hemiaminal or aminal gel composition for use in 3D printing, the method including preparing a liquid precursor composition, the liquid precursor composition operable to remain in a first liquid state at about room temperature, where the liquid precursor composition comprises: an organic amine composition; an aldehyde composition; a polar aprotic organic solvent; and a carbon nanomaterial; heating the liquid precursor composition to transition from the liquid state to a gel state; transitioning the gel state to a second liquid state; and 3D printing a solid carbon nanomaterial object comprising a solid printed gel from the second liquid state with a pre-determined orientation for the carbon nanomaterial.

Provided is an ink composition to be used on a leather substrate, wherein the ink composition is capable of forming an ink film having more abrasion resistance and flexibility and forming a clearer image. An ink composition to be used on a leather substrate that contains at least a coloring material, a resin, and an organic solvent, does not contain water, and the organic solvent contains a solvent represented by general formula (1).

R.sub.1—(OR.sub.2).sub.n—O—R.sub.3  (1)

n: integer of from 1 to 4, R.sub.1: C1-8 optionally branched alkyl group, R.sub.2: C1-4 optionally branched alkylene group, R.sub.3: hydrogen or C1-4 optionally branched alkyl group.

Provided is an ink composition to be used on a leather substrate, wherein the ink composition is capable of forming an ink film having more abrasion resistance and flexibility and forming a clearer image. An ink composition to be used on a leather substrate that contains at least a coloring material, a resin, and an organic solvent, does not contain water, and the organic solvent contains a solvent represented by general formula (1).

R.sub.1—(OR.sub.2).sub.n—O—R.sub.3  (1)

n: integer of from 1 to 4, R.sub.1: C1-8 optionally branched alkyl group, R.sub.2: C1-4 optionally branched alkylene group, R.sub.3: hydrogen or C1-4 optionally branched alkyl group.

Provided are light-emitting particles having high stability while having perovskite-type semiconductor nanocrystals having excellent light-emitting properties, a method for producing the same, and a light-emitting particle dispersion, an ink composition, and a light-emitting element containing such light-emitting particles. The method for producing light-emitting particles of the present invention includes a step of preparing parent particles 91 composed of perovskite-type semiconductor nanocrystals 911 having light-emitting properties and a surface layer 912 which is composed of ligands coordinated on the surface of the semiconductor nanocrystal 911 and in which the ligand molecules form a siloxane bond with each other, and a step of forming a polymer layer 93 by coating the surface of the parent particle 91 with a hydrophobic polymer.