A method of inkjet printing a colour image including a metallic or pearlescent colour includes the steps of applying on part of an ink receiver a layer containing a pearlescent or metallic pigment having a volume mean particle size of at least 3.0 μm as measured by laser diffraction; and inkjet printing on part of the layer containing the pearlescent or metallic pigment a layer with a white inkjet ink containing a white pigment having an average particle size between 250 and 400 nm as measured by differential centrifugal sedimentation.

A method of inkjet printing a colour image including a metallic or pearlescent colour includes the steps of applying on part of an ink receiver a layer containing a pearlescent or metallic pigment having a volume mean particle size of at least 3.0 μm as measured by laser diffraction; and inkjet printing on part of the layer containing the pearlescent or metallic pigment a layer with a white inkjet ink containing a white pigment having an average particle size between 250 and 400 nm as measured by differential centrifugal sedimentation.

By the use of an ultraviolet curable inkjet ink set for a line head printer comprising a lower layer ink containing a polymerizable monomer having a specific structure, and, a specific photopolymerization initiator, and an upper layer ink containing a polymerizable monomer having a specific structure and a specific photopolymerization initiator, wherein among the lower layer ink and the upper layer ink, one of the inks is a white ink and the other ink is a black ink, a good printed matter having excellent adhesion between a recording medium and the ink layer, and, between different ink layers can be obtained without generating curing wrinkles and curling over time even during high speed printing.

By the use of an ultraviolet curable inkjet ink set for a line head printer comprising a lower layer ink containing a polymerizable monomer having a specific structure, and, a specific photopolymerization initiator, and an upper layer ink containing a polymerizable monomer having a specific structure and a specific photopolymerization initiator, wherein among the lower layer ink and the upper layer ink, one of the inks is a white ink and the other ink is a black ink, a good printed matter having excellent adhesion between a recording medium and the ink layer, and, between different ink layers can be obtained without generating curing wrinkles and curling over time even during high speed printing.

The present invention relates to processes for selective reshaping of nanoparticles in three dimensional articles, three dimensional articles produced by such processes, and methods of using such three dimensional articles. As a result of the aforementioned process, such three dimensional articles can have selective tuning that arises, at least in part, from the reshaped nanoparticles found in such articles. Such tuning provides the aforementioned articles with superior performance that can be advantageous in the areas including such as optical filters, multi-functional composites and sensing elements.

The present invention relates to processes for selective reshaping of nanoparticles in three dimensional articles, three dimensional articles produced by such processes, and methods of using such three dimensional articles. As a result of the aforementioned process, such three dimensional articles can have selective tuning that arises, at least in part, from the reshaped nanoparticles found in such articles. Such tuning provides the aforementioned articles with superior performance that can be advantageous in the areas including such as optical filters, multi-functional composites and sensing elements.

The present invention relates to an ink composition for 3D printing, a 3D printer and a method of controlling the 3D printer. An ink composition for 3D printing according to an aspect of the present invention may include surface-modified inorganic particles, a photocurable material crosslinked with the surface-modified inorganic particles and a photoinitiator which cures the photocurable material.

The present invention relates to an ink composition for 3D printing, a 3D printer and a method of controlling the 3D printer. An ink composition for 3D printing according to an aspect of the present invention may include surface-modified inorganic particles, a photocurable material crosslinked with the surface-modified inorganic particles and a photoinitiator which cures the photocurable material.

A water dispersion of gel particles, in which the gel particles having a three-dimensional crosslinked structure including at least one of Polymer Structure (1) or Polymer Structure (2), having a hydrophilic group and a polymerizable group, and including photopolymerization initiators are dispersed in water, a method of producing the water dispersion, and an image forming method using the water dispersion are provided. P.sup.1 and P.sup.2 represent a polymer chain consisting of polyester and the like and having a number-average molecular weight of 500 or greater, Z.sup.11 represents a (n.sub.1+1)-valent group, Z.sup.12 represents a (m.sub.1+1)-valent group, m.sub.1, n.sub.1 and n.sub.2 each represent an integer of 1 or greater, X.sup.1 represents a single bond, a —CH.sub.2— group, or a —NH— group, Z.sup.21 represents a (n.sub.2+1)-valent group, R.sup.1 represents a hydrocarbon group that may include a hetero atom.

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A water dispersion of gel particles, in which the gel particles having a three-dimensional crosslinked structure including at least one of Polymer Structure (1) or Polymer Structure (2), having a hydrophilic group and a polymerizable group, and including photopolymerization initiators are dispersed in water, a method of producing the water dispersion, and an image forming method using the water dispersion are provided. P.sup.1 and P.sup.2 represent a polymer chain consisting of polyester and the like and having a number-average molecular weight of 500 or greater, Z.sup.11 represents a (n.sub.1+1)-valent group, Z.sup.12 represents a (m.sub.1+1)-valent group, m.sub.1, n.sub.1 and n.sub.2 each represent an integer of 1 or greater, X.sup.1 represents a single bond, a —CH.sub.2— group, or a —NH— group, Z.sup.21 represents a (n.sub.2+1)-valent group, R.sup.1 represents a hydrocarbon group that may include a hetero atom.

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