TONER

Provided is a toner that can form a high-resolution image that is invisible under visible light and can be seen when irradiated with infrared light. The toner has toner particles containing a binding resin and inorganic infrared absorbing particles, wherein: (1) in spectral analysis of a fixed image...

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Bibliographic Details
Main Authors SUZUKI Koichi, YAMAMOTO Takeshi, HIGASHI Ryuji, TOYODA Takayuki, KITAO Akiko, HASHIMOTO Akira, OKAJIMA Maki
Format Patent
LanguageEnglish
French
German
Published 19.05.2021
Subjects
ADHESIVES
CHEMISTRY
CINEMATOGRAPHY
COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F
DYES
ELECTROGRAPHY
ELECTROPHOTOGRAPHY
HOLOGRAPHY
INORGANIC CHEMISTRY
MAGNETOGRAPHY
MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE
METALLURGY
MISCELLANEOUS APPLICATIONS OF MATERIALS
MISCELLANEOUS COMPOSITIONS
NATURAL RESINS
PAINTS
PHOTOGRAPHY
PHYSICS
POLISHES
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Summary:Provided is a toner that can form a high-resolution image that is invisible under visible light and can be seen when irradiated with infrared light. The toner has toner particles containing a binding resin and inorganic infrared absorbing particles, wherein: (1) in spectral analysis of a fixed image obtained by fixing an unfixed image which is formed on a recording material using the toner and which has an application amount of 0.30 mg/cm2, the absorption rate of light in a wavelength range of 400-800 nm has a maximum value of 10% or less; and (2) in a cross-sectional observation of the toner particles using a transmission electron microscope, when a circle with a radius of 2.0 µm with the barycenter of a cross-sectional image of the toner particles as the center is drawn, and when this circle is subdivided into four quadrants, a fluctuation coefficient for the number of inorganic infrared absorbing particles observed in each quadrant is 0.50 or less.
Bibliography:Application Number: EP20190833727