The present invention relates to the field of low energy radically curable inks for offset or letterpress printing of security documents. In particular, the invention relates to low energy radically curable offset or letterpress printing inks for offset or letterpress printing on a substrate or security document, said low energy radically curable inks having a viscosity in the range of about 2.5 to about 25 Pa s at 40° C. and 1000 s.sup.−1 and comprising radically curable (meth)acrylate compounds, one or more one or more photoinitiators of formula (I), one or more machine readable materials and one or more fillers and/or extenders. ##STR00001##

The present invention relates to the field of low energy radically curable inks for offset or letterpress printing of security documents. In particular, the invention relates to low energy radically curable offset or letterpress printing inks for offset or letterpress printing on a substrate or security document, said low energy radically curable inks having a viscosity in the range of about 2.5 to about 25 Pa s at 40° C. and 1000 s.sup.−1 and comprising radically curable (meth)acrylate compounds, one or more one or more photoinitiators of formula (I), one or more machine readable materials and one or more fillers and/or extenders. ##STR00001##

An example of a three-dimensional (3D) printing kit includes a build material composition and a fusing agent to be applied to at least a portion of the build material composition during 3D printing. The build material composition includes a semi-crystalline thermoplastic polymer having a surface energy density greater than 41 mN/m. The fusing agent includes an energy absorber to absorb electromagnetic radiation to coalesce the semi-crystalline thermoplastic polymer in the at least the portion.

An example of a three-dimensional (3D) printing kit includes a build material composition and a fusing agent to be applied to at least a portion of the build material composition during 3D printing. The build material composition includes a semi-crystalline thermoplastic polymer having a surface energy density greater than 41 mN/m. The fusing agent includes an energy absorber to absorb electromagnetic radiation to coalesce the semi-crystalline thermoplastic polymer in the at least the portion.

The present disclosure is drawn to coalescent inks and material sets, such as for 3D printing. In one example, the coalescent ink can include a conjugated polymer, a colorant imparting a visible color to the coalescent ink, and an ink vehicle comprising a high boiling point co-solvent having a boiling point of 250° C. or greater. The high boiling point co-solvent can be present in an amount from about 1 wt % to about 4 wt % with respect to the coalescent ink.

The present disclosure is drawn to coalescent inks and material sets, such as for 3D printing. In one example, the coalescent ink can include a conjugated polymer, a colorant imparting a visible color to the coalescent ink, and an ink vehicle comprising a high boiling point co-solvent having a boiling point of 250° C. or greater. The high boiling point co-solvent can be present in an amount from about 1 wt % to about 4 wt % with respect to the coalescent ink.

The present invention is drawn to low migration energy-curable compositions comprising epoxy acrylates derived from the reaction of poly(alkylene oxide) containing glycidyl ethers with acrylic acid. The compositions of the invention are particularly useful for the printing or coating of food packaging.

The present invention is drawn to low migration energy-curable compositions comprising epoxy acrylates derived from the reaction of poly(alkylene oxide) containing glycidyl ethers with acrylic acid. The compositions of the invention are particularly useful for the printing or coating of food packaging.

An apparatus and process for producing multicolour print with tactile and glitter or other effect on a flexible substrate (100, 400A) is disclosed. The rotogravure printing machine includes a plurality of printing stations (402, 404, 406, 408 and 410) and an inline coating station (412). Printing cylinder of at least one of the printing stations is engraved with depth (d1, d2) between 20 microns and 300 microns, to transfer large volume of radiation curable inks mixed with or without glitter. The coating station (412) provides a clear coat of radiation curable coating mixed with or without glitter, at desirable location on the substrate. The gravure or flexography based coating station may apply spot coating or overall coating based on the requirement. At least one of the printing stations and the coating station may include curing unit (422, 424, 426 and 432) for curing the printed ink and applied coating.

An apparatus and process for producing multicolour print with tactile and glitter or other effect on a flexible substrate (100, 400A) is disclosed. The rotogravure printing machine includes a plurality of printing stations (402, 404, 406, 408 and 410) and an inline coating station (412). Printing cylinder of at least one of the printing stations is engraved with depth (d1, d2) between 20 microns and 300 microns, to transfer large volume of radiation curable inks mixed with or without glitter. The coating station (412) provides a clear coat of radiation curable coating mixed with or without glitter, at desirable location on the substrate. The gravure or flexography based coating station may apply spot coating or overall coating based on the requirement. At least one of the printing stations and the coating station may include curing unit (422, 424, 426 and 432) for curing the printed ink and applied coating.