A radiation curable ink jet composition contains: a dispersant; a polymerizable compound; and a hindered amine compound represented by the following general formula (1) or (2), the radiation curable ink jet composition has a viscosity of 50 mPa.Math.s or less at 25 C., and the dispersant has an acid value of 30 mgKOH/g or more,

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In the formula (1), R.sup.1 represents H, O, or R.sup.2CO, and R.sup.2 represents an alkyl group having 1 to 6 carbon atoms or a substituted or unsubstituted aromatic ring,

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In the formula (2), R.sup.3 represents OCOR.sup.4COO, and R.sup.4 represents an alkyl group having 1 to 12 carbon atoms.

Described is a biomaterial/carbonate-based ink that comprises a biopolymer-based mixture and bioceramics. The photo- and ionic crosslinkable biopolymer mixture comprises polysaccharide and gelatin-based materials. The bioceramics comprises an apatite and a carbonate. The biopolymer-based mixture is mixed with the bioceramics to form the ink. The ink is capable of being applied under wet or dry conditions. The wet condition is seawater or water or other aqueous solution. The ink is capable to instantly get solidified, when UV or blue light is applied in the presence of the ionic components found in seawater. After photo- or ionic crosslinking, this ink is stable for months.

Described is a biomaterial/carbonate-based ink that comprises a biopolymer-based mixture and bioceramics. The photo- and ionic crosslinkable biopolymer mixture comprises polysaccharide and gelatin-based materials. The bioceramics comprises an apatite and a carbonate. The biopolymer-based mixture is mixed with the bioceramics to form the ink. The ink is capable of being applied under wet or dry conditions. The wet condition is seawater or water or other aqueous solution. The ink is capable to instantly get solidified, when UV or blue light is applied in the presence of the ionic components found in seawater. After photo- or ionic crosslinking, this ink is stable for months.

Described herein are phosphor-containing ink compositions for disinfecting surfaces and improving the photostability of synthetic polymers. Methods for preparing the ink compositions are additionally described.

Ink jet printing on a non-absorbent substrate involves a wet primer having a primer viscosity. The wet primer is applied on the non-absorbent substrate. An ink jet ink having an ink jet viscosity lower than the primer viscosity is jetted over the wet primer while the primer is still wet. The wet primer and ink are simultaneously cured on the substrate.

Ink jet printing on a non-absorbent substrate involves a wet primer having a primer viscosity. The wet primer is applied on the non-absorbent substrate. An ink jet ink having an ink jet viscosity lower than the primer viscosity is jetted over the wet primer while the primer is still wet. The wet primer and ink are simultaneously cured on the substrate.

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.

Disclosed is a silane-based composition for forming an imprinting ink for imprint lithography applications in which the crosslinking of the silanes in the composition is suppressed by the inclusion of a compound of Formula 3: wherein R.sub.9 is selected from the group consisting of C.sub.1-C.sub.6 linear or branched alkyl groups and a phenyl group, and wherein n is a positive integer having a value of at least 2. An ink may be formed by adding a PAG, photoinitiator or TAG to the composition such upon their activation, the crosslinking reaction is completed. An imprinting method using 10 such an ink is also disclosed. ##STR00001##

Disclosed is a silane-based composition for forming an imprinting ink for imprint lithography applications in which the crosslinking of the silanes in the composition is suppressed by the inclusion of a compound of Formula 3: wherein R.sub.9 is selected from the group consisting of C.sub.1-C.sub.6 linear or branched alkyl groups and a phenyl group, and wherein n is a positive integer having a value of at least 2. An ink may be formed by adding a PAG, photoinitiator or TAG to the composition such upon their activation, the crosslinking reaction is completed. An imprinting method using 10 such an ink is also disclosed. ##STR00001##