Abstract: A lightfast additive and an ink composition including the same include a benzophenone moiety for lightfastness and a moiety for wettability and the ability to stabilize a colorant, wherein the two moieties are covalently bonded. The lightfast additive may exhibit effective ultraviolet (UV) light absorption capacity, effective wettability, and an ability to stabilize a colorant. The ink composition utilizing the light fast additive thus has an improved lightfastness and long-term storage stability.

Abstract: A water-soluble, antimicrobial active polymer and an ink composition are prepared by coupling an antimicrobial active compound to a branch of polyvinylalcohol. An excellent antimicrobial effect is provided without affecting the properties of the ink composition that includes the polymer. The polymer is added to the ink composition in an amount of 1 to 10 parts by weight based on 100 parts by weight of the ink composition. The ink composition provides extended storage stability due to no coagulation, effective antimicrobial effect even in a printed picture, and no irritation to human skin.

Abstract: An ink composition comprising a coloring agent, a surfactant, a liquid vehicle, and a co-solvent comprising a hetero atom having at least one unshared electron pair; an ink jet printing apparatus containing the ink composition, and a printing process using the ink composition.

Abstract: An ink composition includes a self-dispersible coloring agent that includes an ionic group and a non-ionic linear or cyclic ester or amide moiety on a surface of the coloring agent at a mole ratio of about 1:10 to about 10:1, an organic solvent, and water. The coloring agent has a modified surface, so that stability of the ink can be increased due to an interaction between the coloring agent and the organic solvent, the particle size of the coloring agent can be kept uniform, an adhering force with respect to a substrate is increased to minimize bleeding between colors of a printed image, waterfastness and rubfastness in dry and wet conditions are increased to obtain an excellent colorfastness, and resulting in a high quality printed image and an excellent storage stability.

Abstract: A polymeric dispersant having an affinity with a supercritical fluid is provided, in which a substituent having an affinity with a supercritical fluid is attached to the terminal end of a block copolymer. The polymeric dispersant can disperse a dispersoid to particulate size by lowering surface tension between the dispersoid and the supercritical fluid to promote diffusion of the supercritical fluid into the dispersoid.

Abstract: A light resistant colorant is obtained by coupling a dye or a pigment with a light resistant material. A light resistant colorant-containing composition has no additional light stabilizer. Therefore, side effects caused by the addition of a light stabilizer, such as precipitate generation, may be prevented. Furthermore, substrates to which the composition is applied preserve excellent light resistance for a long term.

Abstract: An ink composition including a colorant, a solvent, and a surface property treatment agent represented by the following formula (1): where each of Y1, Y2, and Y3 is independently —N(R3)- or —O—. R3 is H, a C1-C20 alkyl group, or a C6-C20 aryl group, each of R1 and R2 is independently a chemical bond, a C1-C10 alkylene group, a C2-C10 alkenylene group, a C2-C10 alkynylene group, or a C1-C20 alkyl group including a C2-C10 alkenylene group or a C2-C10 alkynylene group, 1?a?7, and b, c?0 are integers, each of A and B is a hydrophobic moiety or are connected to each other to form a ring, A and B cannot simultaneously be H, and B can be a hetero atom. The ink composition can reduce smearing by increasing the rate of penetration into paper and may increase a duration of storage stability, while using little or no surfactant.

Abstract: A self-dispersing colorant containing a triazine moiety and an ink composition including the same are disclosed. The ink composition has excellent storage ability. Further, images formed using the ink composition have excellent light fastness and excellent water resistance.

Abstract: The present invention relates to an antibacterial colorant and a composition that includes the antibacterial colorant. The antibacterial colorant has at least one functional group and at least one antibacterial moiety bound thereto by an ester bond or an amide bond.

Abstract: A multicolor recording medium, recording method and device using the same are disclosed. The multicolor recording medium includes a substrate having top and bottom surfaces and a photosensitive decoloring layer. A low-temperature thermosensitive coloring layer is disposed on the top surface of the substrate. A high-temperature thermosensitive coloring layer is disposed on the low-temperature thermosensitive coloring layer.

Abstract: An ink composition includes a colorant, a solvent, and an amide compound. Due to the use of the amide compound, the ink composition has effective storage stability and wetness at nozzles and has a low mobility of a colorant due to interaction between the colorant and the amide compound and a high adhesion to paper, thus minimizing bleeding between colors of printed images. In addition, the ink composition has effective color fastness, such as water fastness and dry and wet rubfastness of printed images, on paper, thus providing improved quality and durability of printed images. Further, the ink composition provides improved long-term storage stability. Thus, the ink composition may be used in various applications, such as inks for inkjet printers or printing, coatings, textile printing, making papers, cosmetics, ceramics, and the like.

Abstract: An ink set, an inkjet recording apparatus including the ink set, and a method of forming an image using the ink set include a black ink composition comprising a first colorant, water, and a first alkyl ether and a color ink composition comprising a second colorant, water, and a second alkyl ether, wherein an amount of the first alkyl ether based on 100 parts by weight of the black ink composition is at most twice an amount of the second alkyl ether based on 100 parts by weight of the color ink composition. When using the ink set, an image of effective quality may be formed which has a reduced bleeding without decreasing an image density.

Abstract: A dispersant having excellent adsorption to hydrophobic particles and an ink composition comprising the dispersant are provided. The dispersant is a block copolymer comprising a hydrophilic moiety and a hydrophobic moiety having a hydrophobic substituent attached to a terminal end of the hydrophobic moiety.

Abstract: An ink composition is provided including an amide compound represented by formula 1, a coloring agent and a solvent. The amide compound and the polyhydric alcohol in the ink composition decrease the mobility of coloring agents and increase the adhesion to media, thereby minimizing the bleeding between colors of printed images, and improving the water fastness and dry and wet rub fastness to provide good color fastness on papers. The ink composition also improves the quality of the printed image, and also has good long-term storage stability. Thus, the ink composition can be widely used as ink-jet inks for ink-jet printers, printing inks, paints, textile printing, paper manufacturing, cosmetics manufacturing, ceramic industry, etc.

Abstract: A self-dispersible coloring agent represented by formula (II) below is prepared by incorporating a hydrophilic group into a coloring agent through a reaction of a hydrophilic group-containing halide represented by formula (I) below and the coloring agent in the presence of a Lewis acid catalyst: X-L-R1??(I) the coloring agent)-L-R11??(II) wherein L represents a single bond or —C(?O)—; R1 is selected from the group consisting of a substituted or unsubstituted C1-C20 alkyl group containing a hydrophilic group, a substituted or unsubstituted C6-C20 aryl group containing a hydrophilic group a substituted or unsubstituted C2-C20 heteroaryl group containing a hydrophilic group and a substituted or unsubstituted C7-C20 arylalkyl group containing a hydrophilic group; and X is one of: —F, —Br, —I and —Cl. may be obtained conveniently through a one-step process.

Abstract: A metal complex colorant represented by formula 1 may embody various colors and has improved fastness, such as light resistance, water resistance and the like: wherein each of A1 and A2 is independently a moiety which includes a substituted or unsubstituted C2-C30 alkenylene group having at least one double bond and is conjugated with an azo group; each of X1 and X2 is selected from the group consisting of a hydroxy group, a C1-C4 alkoxy group, a carboxyl group, and a substituted or unsubstituted amino group;M is a polyvalent transition metal; L is a neutral or anionic ligand; n is an integer from 1 to 3; and J is a linker. The metal complex colorant may be used in various fields employing colors, such as fibers, foods, drugs, cosmetics, coatings, inks or ceramics.

Abstract: A self-dispersible metal complex colorant is represented by formula 1, which has improved storage stability, may embody various colors and has improved fastness, such as light resistance, water resistance and the like: wherein each of A1 and A2 is independently a moiety which includes a substituted or unsubstituted C2-C30 alkenylene group having at least one double bond and is conjugated with an azo group; each of X1 and X2 is selected from the group consisting of a hydroxy group, a C1-C4 alkoxy group, a carboxyl group, and a substituted or unsubstituted amino group; M is a polyvalent transition metal; L is a neutral or anionic ligand; T is a mono- or poly-substituted hydrophilic functional group; n is an integer between 1 and 3; and J is a linker. The self-dispersible metal complex colorant may be used in various fields employing colors, such as fibers, foods, drugs, cosmetics, coatings, inks or ceramics.

Abstract: A printing medium has a base layer, an ink receptive layer coated on the base layer, and an undercoating layer formed between the base layer and the ink receptive layer. The undercoating layer has a highly glossy resin property. Accordingly, regardless of a type of a material that is used in the base layer, the printing medium always offers rapid ink absorption, a vivid color image, excellent color fixation, a high water and light resistance, and high glossiness.

Abstract: A self-dispersible bipyridine-based metal complex includes a bipyridine-based ligand and a metal, and an ink composition including the metal complex. The bipyridine-based metal complex may be self-dispersed without requiring a dispersing agent and may be used as a colorant per se. Furthermore, the metal complex, when binding with a common colorant, may produce various colors and exhibit enhanced durability including light resistance. In addition, the metal complex includes a hydrophilic group-containing ligand coordinating with the metal, in addition to the bipyridine-based ligand, and thus, has a bulky structure. Therefore, dispersion stability is enhanced by a self-dispersion system based on a steric hindrance due to the bulky structure of the metal complex and an electrostatic repulsive force between the charged metal and the hydrophilic group-containing ligand, thus enhancing a long-term storage stability.

Abstract: A composition for forming an ink acceptable layer of a recording medium for inkjet printers and a recording medium for inkjet printers using the same. The composition comprises an inorganic filler, hydrophilic binder, core-shell structured cationic latex and polyamide-epichlorohydrin resin, and the recording medium comprises the above-described composition for forming an ink acceptable layer. The composition provides a recording medium for inkjet printers comprising an ink acceptable layer having excellent water and moisture resistance while maintaining a superior ink absorption amount and ink absorption rate.