Samsung Electronics Co., Ltd.

Hiromichi Jin

Hiroshi Miyao

Miyao Hiroshi

An external additive for a toner includes: a particulate of a polymerization product of at least one silicon compound selected from a silane compound represented by Chemical Formula 1: Si(OR)(wherein Ris a C1 to C6 monovalent hydrocarbon group) and a hydrolysis-condensation product thereof. The particulate has the following properties: a number average particle diameter of about 50 nm to about 250 nm, a first specific surface area (&#x3b1;) measured by a gas adsorption method of about 13 m/g to about 80 m/g, and true density measured by a nominal volume expansion method of about 1.9 g/cmto about 2.1 g/cm.

External additive for toner, process for producing the same, and toner comprising the same

A complex particle including a core particle and a shell particle,

Complex particle, external additive for toner and method of preparing complex particle

An external additive for toner includes a particulate obtained from a silicone compound selected from a silane compound represented by Chemical Formula 1, Si(OR), wherein each Ris independently a C1 to C6 monovalent hydrocarbon group, a hydrolysis-condensation product of the silane compound, and a combination thereof, wherein the particulate has an average particle diameter ranging from about 50 nm to about 250 nm and a true density ranging from about 1.80 g/cmto about 2.00 g/cm.

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Yokohama, Japan

Hiromichi Jin