Kao Corporation

Yasuhiro Shidahara

Hiroshi Mizuhata

Koji Shimokusa

Manato Ikeda

A warming device including a heat generating element that contains a powder of an oxidizable metal, a powder of a carbon material, water, and a powder of a porous material other than the oxidizable metal and the carbon material. The heat generating element is a sheet material, and in the heat generating element, a ratio of the mass content of the water to the mass content of the powder of the oxidizable metal multiplied by one hundred [100×(water/powder of oxidizable metal)] is from 30 to 270.

Heating implement

The present invention relates to a process for producing a toner for electrophotography which is capable of suppressing liberation of a wax from a resin binder and exposure of the wax to a surface of respective toner particles in the step of obtaining fused particles upon production of the toner, and reducing a content of fine powders in the toner, and which is characterized by an excellent low-temperature fusing property and an excellent anti-high-temperature offset property. The process for producing a toner for electrophotography according to the present invention includes the following steps 1 to 3: Step 1 of mixing and emulsifying a wax, a resin emulsion containing a resin having an acid value of from 10 to 300 mgKOH/g, and an oxazoline group-containing polymer with each other to obtain a water dispersion of releasing agent particles; Step 2 of mixing and aggregating the water dispersion of the releasing agent particles obtained in the step 1 with a water dispersion of resin particles containing a carboxyl group-containing resin binder to obtain aggregated particles; and Step 3 of fusing the aggregated particles obtained in the step 2 to obtain fused particles.

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Sumida-ku, Japan

Yasuhiro Shidahara