A method of forming an image on a substrate that involves applying a radiation curable white inkjet ink composition comprising a radiation curable anti-wrinkle agent onto a surface of the substrate, exposing the radiation curable white inkjet ink composition to UV light having a wavelength of less than 200 nm to pin the radiation curable white inkjet ink composition and form a coated substrate having an arithmetical mean surface roughness value R.sub.a of less than or equal to 2.0 micrometers and an arithmetical mean surface roughness depth R.sub.z of less than or equal to 10.0 micrometers, applying a radiation curable CMYK inkjet ink composition onto the coated substrate, and curing with electron beam radiation.

There is provided a maintenance liquid, which is used in maintenance of a device equipped with a discharge head for discharging an ultraviolet ray curable-type composition containing the acyl phosphine oxide-based photopolymerization initiator toward an attachment object, including a polymerizable compound in which a saturation solubility of an acyl phosphine oxide-based photopolymerization initiator at 20° C. is equal to or greater than 5.0% by mass.

There is provided a maintenance liquid, which is used in maintenance of a device equipped with a discharge head for discharging an ultraviolet ray curable-type composition containing the acyl phosphine oxide-based photopolymerization initiator toward an attachment object, including a polymerizable compound in which a saturation solubility of an acyl phosphine oxide-based photopolymerization initiator at 20° C. is equal to or greater than 5.0% by mass.

Provided is an ultraviolet curable silicone composition capable of being ejected via inkjet ejection. The composition of the invention is an ultraviolet curable silicone composition comprising: (A) an organopolysiloxane represented by the following general formula (1)

##STR00001##

wherein each R.sup.1 independently represents a group selected from a monovalent aliphatic hydrocarbon group having 1 to 10 carbon atoms, an acryloyl group, a methacryloyl group, an alkyl acrylate group and an alkyl methacrylate group, while the component (A) has per molecule at least two groups selected from an acryloyl group, a methacryloyl group, an alkyl acrylate group and an alkyl methacrylate group; n represents a number satisfying 10≤n≤1,000; (B) a monofunctional (meth)acrylate compound having no siloxane structure; and/or (C) a multifunctional (meth)acrylate compound having no siloxane structure; and (D) a photopolymerization initiator.

Provided is an ultraviolet curable silicone composition capable of being ejected via inkjet ejection. The composition of the invention is an ultraviolet curable silicone composition comprising: (A) an organopolysiloxane represented by the following general formula (1)

##STR00001##

wherein each R.sup.1 independently represents a group selected from a monovalent aliphatic hydrocarbon group having 1 to 10 carbon atoms, an acryloyl group, a methacryloyl group, an alkyl acrylate group and an alkyl methacrylate group, while the component (A) has per molecule at least two groups selected from an acryloyl group, a methacryloyl group, an alkyl acrylate group and an alkyl methacrylate group; n represents a number satisfying 10≤n≤1,000; (B) a monofunctional (meth)acrylate compound having no siloxane structure; and/or (C) a multifunctional (meth)acrylate compound having no siloxane structure; and (D) a photopolymerization initiator.

A radiation curable inkjet ink containing a polymerizable compound including a vinylether group or a vinylamide group; optionally an amine synergist including an alkanolamine group or a dimethyl benzoate group; optionally a Norrish Type II photoinitiator including a photoinitiating moiety selected from the group consisting of a thioxanthone group, a benzophenone group, a ketocoumarin group and a camphorquinone group; and a specific singlet oxygen quencher.

A radiation curable inkjet ink containing a polymerizable compound including a vinylether group or a vinylamide group; optionally an amine synergist including an alkanolamine group or a dimethyl benzoate group; optionally a Norrish Type II photoinitiator including a photoinitiating moiety selected from the group consisting of a thioxanthone group, a benzophenone group, a ketocoumarin group and a camphorquinone group; and a specific singlet oxygen quencher.

A formulation system usable in additive manufacturing of a three-dimensional object that comprises, in at least a portion thereof, a cyanate ester-containing polymeric network, and additive manufacturing processes employing the formulation system are provided. Also provided are objects obtainable by the additive manufacturing and kits containing the formulation system. The formulation system includes a first modeling material formulation which includes a first curable material which is a thermally-curable cyanate ester and a second modeling material formulation which comprises an activating agent for promoting polymerization of the cyanate ester and is devoid of the first curable material, and further includes a second curable material which is different from the first curable material, and optionally an agent for promoting hardening of the second curable material.

An electron-beam curable ink or coating for sensitive applications such as food packaging and pharmaceutical packaging. The ink or coating of the invention comprises a high bio-renewable content. A printed article or laminate comprising a cured layer derived from the ink or coating of the invention.

An electron-beam curable ink or coating for sensitive applications such as food packaging and pharmaceutical packaging. The ink or coating of the invention comprises a high bio-renewable content. A printed article or laminate comprising a cured layer derived from the ink or coating of the invention.