A positive temperature coefficient (PTC) composition having a first thermally active polymer having a melting point of 30-70° C. and providing a first PTC in a lower temperature range below 70° C., and a second thermally active polymer having a melting point of 70-140° C. and providing a second PTC in a higher temperature range above 70° C., the composition also having conductive particles; and an organic solvent with a boiling point higher than 100° C., solvent being capable of dissolving both the first and second thermally active polymer. The PTC composition has two distinct PTC characteristics at the two different temperature ranges.

A positive temperature coefficient (PTC) composition having a first thermally active polymer having a melting point of 30-70° C. and providing a first PTC in a lower temperature range below 70° C., and a second thermally active polymer having a melting point of 70-140° C. and providing a second PTC in a higher temperature range above 70° C., the composition also having conductive particles; and an organic solvent with a boiling point higher than 100° C., solvent being capable of dissolving both the first and second thermally active polymer. The PTC composition has two distinct PTC characteristics at the two different temperature ranges.

The present invention relates to a graphene ink composition including charged chemically modified graphene, a graphene flake, a binder and a solvent, wherein an absolute value of the zeta potential of the charged chemically modified graphene is 25 mV or more.

The present invention relates to a graphene ink composition including charged chemically modified graphene, a graphene flake, a binder and a solvent, wherein an absolute value of the zeta potential of the charged chemically modified graphene is 25 mV or more.

There is a compound represented by the following formula (I): ##STR00001##
in which R1 and R2, identical or different, represent a C.sub.2-C.sub.30 alkyl group, a C.sub.2-C.sub.30 alkenyl group, a C.sub.2-C.sub.30 alkynyl group, or a C.sub.2-C.sub.30 alkoxy group, the alkyl, alkenyl, alkynyl, or alkoxy groups being optionally substituted with at least one hydroxy, halogen, amino, C.sub.1-C.sub.8 alkyl, or C.sub.1-C.sub.8 alkoxy group, as a temperature change regulating agent in a thermochromic ink composition. There also are thermochromic pigment microcapsules having a compound of formula (I) according to the disclosure, to ink compositions having such thermochromic pigment microcapsules, and to writing instruments comprising such ink compositions.

There is provided an anti-counterfeit ink composition, an anti-counterfeit ink, and an anti-counterfeit printed matter that transmits a visible light region, having absorption in an infrared region, and capable of judging authenticity of a printed matter, and containing composite tungsten oxide fine particles, the composite tungsten oxide fine particles having a hexagonal crystal structure, having a lattice constant such that a-axis is 7.3850 Å or more and 7.4186 Å or less, and c-axis is 7.5600 Å or more and 7.6240 Å or less, and having a particle size of the near-infrared absorbing material fine particles is 100 nm or less, and a method for producing the anti-counterfeit ink composition, the anti-counterfeit ink, the anti-counterfeit printed matter, and the anti-counterfeit ink composition.

There is provided an anti-counterfeit ink composition, an anti-counterfeit ink, and an anti-counterfeit printed matter that transmits a visible light region, having absorption in an infrared region, and capable of judging authenticity of a printed matter, and containing composite tungsten oxide fine particles, the composite tungsten oxide fine particles having a hexagonal crystal structure, having a lattice constant such that a-axis is 7.3850 Å or more and 7.4186 Å or less, and c-axis is 7.5600 Å or more and 7.6240 Å or less, and having a particle size of the near-infrared absorbing material fine particles is 100 nm or less, and a method for producing the anti-counterfeit ink composition, the anti-counterfeit ink, the anti-counterfeit printed matter, and the anti-counterfeit ink composition.

A discharge printing agent contains a sulfinic acid compound, a thickening polymer having carboxylic acid groups —COOH or carboxylate groups —COO— attached to the polymeric backbone, an odour control agent, and water. The discharge printing agent has a viscosity of 2,500-150,000 mPa.Math.s. A method can be used for preparing the discharge printing agent, and a precursor composition of the discharge printing agent can be used in the method. A discharge printing process using the discharge printing agent can produce a dyed fabric having a pattern.

The present invention relates to an ink composition for an organic light emitting device that can be applied to an inkjet process. The ink composition comprises a compound represented by the following Chemical Formula 1, a first solvent of aromatic esters having a boiling point of 260 to 400° C., and a second solvent of aliphatic ethers or aliphatic esters having a boiling point of 200 to 400° C., wherein the boiling point of the first solvent is higher than that of the second solvent. When this is applied to an inkjet process, it can form a flat film with a smooth surface when dried after forming the ink film. ##STR00001##
wherein L, L.sub.1 to L.sub.4, Ar.sub.1, Ar.sub.2, R.sub.1 to R.sub.4, Y.sub.1 to Y.sub.4, and n.sub.1 to n.sub.4 are described herein.

The present invention relates to an ink composition for an organic light emitting device that can be applied to an inkjet process. The ink composition comprises a compound represented by the following Chemical Formula 1, a first solvent of aromatic esters having a boiling point of 260 to 400° C., and a second solvent of aliphatic ethers or aliphatic esters having a boiling point of 200 to 400° C., wherein the boiling point of the first solvent is higher than that of the second solvent. When this is applied to an inkjet process, it can form a flat film with a smooth surface when dried after forming the ink film. ##STR00001##
wherein L, L.sub.1 to L.sub.4, Ar.sub.1, Ar.sub.2, R.sub.1 to R.sub.4, Y.sub.1 to Y.sub.4, and n.sub.1 to n.sub.4 are described herein.