A photochromic composition having at least one photochromic naphthopyran-based component with R′ and R″ groups selected from hydrogen, alkyl, fluorinated alkyl, alkenyl, alkynyl, alkylaryl, cycloalkyl, alkoxy, halogen, amine, carbonate ester, carboxylate, aryl, substituted aryl, heteroaryl, substituted heteroaryl or a heterocyclic group and Ar′ and Ar″ groups selected from unsubstituted or substituted cyclic five-membered or six-membered structures including benzene, pyridine, thiophene, furan, carbazole, triphenylamine, dibenzothiophene, dibenzofuran, fluorine, naphthalene, anthracene and pyrene. The photochromic composition is excitable under a visible light range to produce a color change. A second photochromic naphthopyran-based component with a different thermal decay rate constant (k) may further be included in the photochromic composition. The photochromic composition is incorporated into color-changing inks and polymers.

A radiation-curable ink jet composition includes a polyfunctional monomer containing a predetermined acrylic compound, and a monofunctional monomer containing vinyl methyl oxazolidinone.

A radiation-curable ink jet composition includes a polyfunctional monomer containing a predetermined acrylic compound, and a monofunctional monomer containing vinyl methyl oxazolidinone.

The present invention provides an ink composition containing light-emitting nanocrystal particles and a photopolymerizable compound, wherein the photopolymerizable compound has a Log P value in the range of −1.5 to 7.0. The present invention also provides an ink composition containing light-emitting nanocrystal particles and a photopolymerizable compound, wherein the photopolymerizable compound has a Log P value in the range of −1.0 to 6.5, and the ink composition has a water (H.sub.2O) content of 90 ppm or less measured with a Karl Fischer moisture meter. The present invention also provides a light conversion layer including a plurality of pixel units, wherein the plurality of pixel units include a pixel unit containing a cured product of the ink composition, and the light conversion layer is formed of the cured product of the ink composition. The present invention also provides a color filter including the light conversion layer.

The present invention provides an ink composition containing light-emitting nanocrystal particles and a photopolymerizable compound, wherein the photopolymerizable compound has a Log P value in the range of −1.5 to 7.0. The present invention also provides an ink composition containing light-emitting nanocrystal particles and a photopolymerizable compound, wherein the photopolymerizable compound has a Log P value in the range of −1.0 to 6.5, and the ink composition has a water (H.sub.2O) content of 90 ppm or less measured with a Karl Fischer moisture meter. The present invention also provides a light conversion layer including a plurality of pixel units, wherein the plurality of pixel units include a pixel unit containing a cured product of the ink composition, and the light conversion layer is formed of the cured product of the ink composition. The present invention also provides a color filter including the light conversion layer.

A white ink jet ink composition including hollow resin particles, resin particles, and water, in which a glass transition temperature of the hollow resin particles is 120° C. or higher, and a glass transition temperature of the resin particles is 5° C. or lower.

A white ink jet ink composition including hollow resin particles, resin particles, and water, in which a glass transition temperature of the hollow resin particles is 120° C. or higher, and a glass transition temperature of the resin particles is 5° C. or lower.

Methods for product authentication, which include: providing an article having a substrate with an analyte encoded composition; obtaining a sample of the composition; applying the sample to a test device to obtain test results, analyzing test results from the test device using an electronic device communicatively connected to an authentication authority, wherein the electronic device transmits the test device code and the test results to the authentication authority and confirms or denies authentication after comparison to an authentication database of authentic test results.

A water-based ink jet ink composition according to the present disclosure includes: a colorant; an amine; and a water-soluble low molecular weight organic compound and is used for recording on a non-absorbing recording medium or a low-absorbing recording medium. The water-soluble low molecular weight organic compound contains an alkylene glycol monoether (B) represented by general formula (1) having a standard boiling point of 210° C. or less and an alkanediol (A) having a standard boiling point of 210° C. or less at a mass ratio (B/A) of 0.2 to 0.9, a content of a water-soluble low molecular weight organic compound having a standard boiling point of 250° C. or less is 8 to 30 percent by mass with respect to a total mass of the ink composition, a water-soluble low molecular weight organic compound which is an alkane polyol having a standard boiling point of more than 250° C. is not contained at a content of more than 3 percent by mass with respect to the total mass of the ink composition, and a content of the amine with respect to the total mass of the ink composition is 5 percent by mass or less.

##STR00001##

In the general formula (1), R.sub.1 represents an alkylene group having 2 to 5 carbon atoms, R.sub.2 represents an alkyl group having 1 or 2 carbon atoms, and n represents 1 or 2.

A water-based ink jet ink composition according to the present disclosure includes: a colorant; an amine; and a water-soluble low molecular weight organic compound and is used for recording on a non-absorbing recording medium or a low-absorbing recording medium. The water-soluble low molecular weight organic compound contains an alkylene glycol monoether (B) represented by general formula (1) having a standard boiling point of 210° C. or less and an alkanediol (A) having a standard boiling point of 210° C. or less at a mass ratio (B/A) of 0.2 to 0.9, a content of a water-soluble low molecular weight organic compound having a standard boiling point of 250° C. or less is 8 to 30 percent by mass with respect to a total mass of the ink composition, a water-soluble low molecular weight organic compound which is an alkane polyol having a standard boiling point of more than 250° C. is not contained at a content of more than 3 percent by mass with respect to the total mass of the ink composition, and a content of the amine with respect to the total mass of the ink composition is 5 percent by mass or less.

##STR00001##

In the general formula (1), R.sub.1 represents an alkylene group having 2 to 5 carbon atoms, R.sub.2 represents an alkyl group having 1 or 2 carbon atoms, and n represents 1 or 2.