The present invention is drawn to UV-curable ink and coating compositions comprising cleavage type photoinitiators and acids. The acids may be inorganic or organic acids, or acids generated by a photoacid generator during UV-cure. Incorporation of the acids into the UV-curable ink and coating compositions results in a reduction of migratable photodecomposition products that are produced by cleavage type photoinitiators during UV-cure. The ink and coating compositions are particularly useful for use in applications that require low migration of low molecular weight materials, such as, for example, food packaging.

According to one aspect of an inventive concept, an ink includes a nonradiation-curable pre-polymer having at least two nonradiation-curable components per molecule of the nonradiation-curable pre-polymer, a radiation-curable component, a polymer having at least one reactive hydrogen component, and a photoinitiator. A concentration of the nonradiation-curable pre-polymer having at least two nonradiation-curable components is in a range of greater than 0 weight % to less than 99 weight % of a total weight of the ink.

According to one aspect of an inventive concept, an ink includes a nonradiation-curable pre-polymer having at least two nonradiation-curable components per molecule of the nonradiation-curable pre-polymer, a radiation-curable component, a polymer having at least one reactive hydrogen component, and a photoinitiator. A concentration of the nonradiation-curable pre-polymer having at least two nonradiation-curable components is in a range of greater than 0 weight % to less than 99 weight % of a total weight of the ink.

A UV curable inkjet ink contains at least one free radical photoinitiator and at least 30 wt % of a mixture including 0 to 45 wt % of a polymerizable oligomer, at least 5 wt % of a polyfunctional propoxylated acrylate and at least 20 wt % of a monofunctional ethoxylated methacrylate according to Formula (I): ##STR00001##
with n representing an integer of 1 to 4 and R representing an alkyl group; the weight ratio of the polyfunctional propoxylated acrylate over the monofunctional ethoxylated methacrylate is less than 1.60; and all the weight percentages wt % are based on the total weight of the UV curable inkjet ink.

A UV curable inkjet ink contains at least one free radical photoinitiator and at least 30 wt % of a mixture including 0 to 45 wt % of a polymerizable oligomer, at least 5 wt % of a polyfunctional propoxylated acrylate and at least 20 wt % of a monofunctional ethoxylated methacrylate according to Formula (I): ##STR00001##
with n representing an integer of 1 to 4 and R representing an alkyl group; the weight ratio of the polyfunctional propoxylated acrylate over the monofunctional ethoxylated methacrylate is less than 1.60; and all the weight percentages wt % are based on the total weight of the UV curable inkjet ink.

A manufacturing method of decorated natural leather includes applying a base coat on crusted leather, inkjet printing a decorative image on the base coat using one or more pigmented inkjet inks, and applying one or more identification codes.

A manufacturing method of decorated natural leather includes applying a base coat on crusted leather, inkjet printing a decorative image on the base coat using one or more pigmented inkjet inks, and applying one or more identification codes.

An inkjet composition for additive manufacturing includes at least one photocurable compound, at least one thermocurable compound and a photoinitiator, wherein the at least one photocurable compound and the at least one thermocurable compound are different compounds. A method for manufacturing a three-dimensional object includes dispensing and curing an inkjet composition.

An inkjet composition for additive manufacturing includes at least one photocurable compound, at least one thermocurable compound and a photoinitiator, wherein the at least one photocurable compound and the at least one thermocurable compound are different compounds. A method for manufacturing a three-dimensional object includes dispensing and curing an inkjet composition.

To provide an active energy ray-curable ink composition that increase the content of raw materials derived from biomass and contains a material having superior pigment dispersibility, such as a rosin-modified phenol resin. An active energy ray-curable ink composition containing a compound having one or more ethylenically unsaturated bonds, a specific resin, and a specific liquid ingredient is provided, wherein the specific resin is at least one selected from the group consisting of rosin-modified phenol resins, rosin-modified maleic acid resins, rosin-modified alkyd resins, gilsonite resins, and asphalt resins, and the specific liquid ingredient is fat and oil that is derived from animals or vegetables or a modified product thereof having no ethylenically unsaturated bonds and a solubility parameter value (hereinafter referred to as sp value) of 9.0 (cal/cm.sup.3).sup.1/2 to less than 11.0 (cal/cm.sup.3).sup.1/2 as measured by turbidimetric titration.