Samsung Fine Chemicals Co., Ltd.

Jae Bum Park

Dong Won Kim

Woo Young Yang

Dae Il Hwang

Keon Il Kim

Duck Kyun Ahn

Jae Kwang Hwang

Il Sun Hwang

Il Hyuk Kim

Dae Woong Choi

Jun Hee Lee

Provided are a toner and a method of preparing the same. The toner includes a binder resin, a coloring agent, and at least one additive, and a storage modulus curve of the toner with respect to temperature has multiple inflection points. The toner may be used in an electrophotographic image forming apparatus.

Toner having multiple inflection points on storage modulus curve with respect to temperature and method of preparing the same

Provided are a method of forming a toner image and an electrophotographic image forming apparatus including a toner. The method of forming a toner image is performed using a first toner having a yellow color and color coordinate values of a lightness (L) ranging from 91 to 94, a redness (a) ranging from &#x2212;11 to &#x2212;9, and a yellowness (b) ranging from 77 to 82; a second toner having a magenta color and color coordinate values of a lightness (L) ranging from 56 to 61, a redness (a) ranging from 56 to 61, and a yellowness (b) ranging from &#x2212;7 to &#x2212;5; and a third toner having a cyan color and color coordinate values of a lightness (L) ranging from 58 to 62, a redness (a) ranging from &#x2212;33 to &#x2212;30, and a yellowness (b) ranging from &#x2212;42 to &#x2212;37.

Method of forming toner image and electrophotographic image forming apparatus capable of realizing wide color gamut

A toner has a core-shell structure including a toner core portion having a resin with an active hydrogenactive hydrogen containing group, a colorant and at least one additive, and a toner shell portion surrounding the toner core portion, wherein the toner shell portion includes a cross-linked resin prepared by reaction of at least a portion of the active hydrogen containing group and the cross-linking agent.

Toner having core-shell structure and method of preparing the same

Provided is a method of preparing a toner, the method including: preparing a solvent emulsion by stirring a medium including a polar medium, an organic solvent, and a surfactant; adding toner components including a resin and a pigment to the solvent emulsion; removing the organic solvent from the solvent emulsion including the toner components; and collecting a toner particle from the solvent emulsion from which the organic solvent is removed.

Method of preparing toner

Provided are a toner using a resin having an active hydrogen-containing group, and a method of preparing the toner. The toner using a resin having an active hydrogen-containing group includes a binder resin (A), a cross-linked resin including a THF insoluble content of 99-100 weight %, a colorant, and at least one additive. The cross-linked resin is arranged in the form of a plurality of islands in each particle of the toner.

Toner using resin having active hydrogen-containing group and method of preparing the same

A method of preparing a toner using a micro-suspension particle, includes preparing a mixture by mixing a resin having acidic groups, a master batch of coloring pigment, and at least one additive with an organic solvent, and then neutralizing the acid groups of the resin with a base; forming a micro-suspension by adding the prepared mixture to a dispersion medium; and forming a toner composition by removing the organic solvent from the prepared micro-suspension. Therefore, the method of preparing a toner using the disclosed micro-suspension particle and a toner prepared using the same can save manufacturing costs, and can improve charging ability and cleaning properties of the toner.

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Daejeon, South Korea

Jae Bum Park