A polymerizable composition; a product of polymerization of the polymerizable composition; and various molded articles obtained using the polymerizable composition and the product of polymerization of the polymerizable composition. The polymerizable composition contains N-substituted (meth)acrylamide (A) represented by a the formula:

##STR00001##

where R.sup.1 represents a hydrogen atom or a methyl group, one of R.sup.2 and R.sup.3 represents a chain hydrocarbon group having 6 or more carbon atoms or a cyclic hydrocarbon group having 6 or more carbon atoms, the other represents a hydrogen atom, a chain hydrocarbon group having 1 or more carbon atoms, or a cyclic hydrocarbon group having 3 or more carbon atoms, and R.sup.2 and R.sup.3 include a group in which a 6- or more-membered saturated ring is formed together with a nitrogen atom carrying R.sup.2 and R.sup.3.

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.

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 ink contains an anionic compound, water, a photoacid generator, and one or more organic solvents containing at least one organic solvent having a solubility parameter of from 9 to 11.8 (J/cm.sup.3).sup.1/2.

An ink contains an anionic compound, water, a photoacid generator, and one or more organic solvents containing at least one organic solvent having a solubility parameter of from 9 to 11.8 (J/cm.sup.3).sup.1/2.

Provided are a maintenance liquid and a maintenance method that can solve an ejection problem of a UV curable inkjet printer. The maintenance liquid includes: a first ingredient in which a water-soluble compound is soluble and a cured matter of a UV curable ink is insoluble. The maintenance method includes: a first cleaning process at which a water-soluble compound that adheres to an inkjet head included in the UV curable inkjet printer is dissolved by a first maintenance liquid including the first ingredient in which the water-soluble compound is soluble and a cured matter of a UV curable ink is insoluble, and a second cleaning process at which the inkjet head is cleaned by a second maintenance liquid including a second ingredient in which the water-soluble compound is insoluble and the cured matter of the UV curable ink is soluble.

Provided are a maintenance liquid and a maintenance method that can solve an ejection problem of a UV curable inkjet printer. The maintenance liquid includes: a first ingredient in which a water-soluble compound is soluble and a cured matter of a UV curable ink is insoluble. The maintenance method includes: a first cleaning process at which a water-soluble compound that adheres to an inkjet head included in the UV curable inkjet printer is dissolved by a first maintenance liquid including the first ingredient in which the water-soluble compound is soluble and a cured matter of a UV curable ink is insoluble, and a second cleaning process at which the inkjet head is cleaned by a second maintenance liquid including a second ingredient in which the water-soluble compound is insoluble and the cured matter of the UV curable ink is soluble.

A method of ink-extrusion printing an object, including providing a mixture including liquid crystal monomers and photo-catalyzing or heating the mixture to produce a liquid crystal ink. The ink is in a nematic phase. The method includes extruding the ink through a print-head orifice moving along a print direction to form an extruded film of the object. The extruded film exhibits birefringence. Also disclosed are a liquid crystal ink. The ink includes a mixture including liquid crystal monomers. The mixture when at a target printing temperature is in a nematic phase. Also disclosed is ink-extrusion-printed object. The object includes an extrusion-printed film including a nematic liquid crystal elastomer, wherein the film exhibits birefringence along an extrusion axis of the film.

A method of ink-extrusion printing an object, including providing a mixture including liquid crystal monomers and photo-catalyzing or heating the mixture to produce a liquid crystal ink. The ink is in a nematic phase. The method includes extruding the ink through a print-head orifice moving along a print direction to form an extruded film of the object. The extruded film exhibits birefringence. Also disclosed are a liquid crystal ink. The ink includes a mixture including liquid crystal monomers. The mixture when at a target printing temperature is in a nematic phase. Also disclosed is ink-extrusion-printed object. The object includes an extrusion-printed film including a nematic liquid crystal elastomer, wherein the film exhibits birefringence along an extrusion axis of the film.

A radiation curable white inkjet ink including at least 18.5 wt % of white pigment and 0 to 35 wt % of organic solvent, both weight percentages based on the total weight of the radiation curable white inkjet ink and a polymerizable composition containing 0 to 15.0 wt % of one or more polyfunctional polymerizable compounds, and at least 85.0 wt % of one or more monofunctional polymerizable compounds; and a specific polymerizable composition.