Samsung Electronics Co., Ltd.

Su-aa Jung

Seung-min Ryu

Jong-in Lee

Cheol Ham

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.

Self-dispersible bipyridine-based metal complex and ink composition comprising the same

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.

Block copolymeric dispersant for pigment particle in aqueous system, and ink composition comprising the same

A bipyridine-based metal complex includes a complex of bipyridine-based ligands and metals, and is utilized in an ink composition. The bipyridine-based metal complex may be used alone, as well as in combination with other coloring agents.

Bipyridine-based metal complex and ink composition comprising the same

An ink composition is provided including an amide compound represented by formula I, 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.

Ink composition

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-R&#x2003;&#x2003;(I)(the coloring agent)-L-R&#x2003;&#x2003;(II) wherein L represents a single bond or &#x2014;C(&#x2550;O)&#x2014;; Ris selected from the group consisting of a substituted or unsubstituted C-Calkyl group containing a hydrophilic group, a substituted or unsubstituted C-Caryl group containing a hydrophilic group a substituted or unsubstituted C-Cheteroaryl group containing a hydrophilic group and a substituted or unsubstituted C-Carylalkyl group containing a hydrophilic group; and X is one of: &#x2014;F, &#x2014;Br, &#x2014;I and &#x2014;Cl. may be obtained conveniently through a one-step process. The ink composition containing the self-dispersible coloring agent provides effective long-term storage stability and dispersion stability using a one-step process.

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Suwon-si, South Korea

Su-aa Jung