Fixing method
AssigneeCanon Kabushiki Kaisha
InventorsOsamu Tamura, Kazunori Kato
Life of this patent
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Abstract
In a fixing method for fixing a toner image to a transfer medium, heat-and-pressure fixing is carried out using a specific pressure member and a specific toner. The pressure member has a heat-resistant elastic layer having a thermal conductivity of 0.20 W/m·K or below. The toner has, in its DSC endothermic curve, at least a maximum value in the region of temperature of from 105° C. to 150° C., and, in GPC of THF-soluble component of the toner, a main peak in the region of molecular weight of from 2,000 to 25,000, a sub-peak or shoulder in the region of molecular weight of 70,000 or higher, and an Mw/Mn ratio of 8 or higher, containing 20% to 70% of a component belonging to the region of molecular weight of from 1,000 to 10,000.
Claims18
A fixing method comprising fixing a toner image to a transfer medium under application of heat and pressure by transporting a transfer medium having a toner image formed of a toner, so as to be held between a heating member and a pressure member;
- the former having a rotatingly movable heat-resistant film, wherein;
- said pressure member comprises a mandrel and provided thereon with a heat-resistant elastic layer having a thermal conductivity of 0.20 W/m·K or below;
- and
- said toner comprises toner particles containing at least a binder resin, a colorant and a wax, and an external additive;
- said toner having, in its differential scanning calorimetry endothermic curve, at least a maximum value in the region of temperature of from 105° C to 150° C., and having, in gel permeation chromatography of tetrahydrofuran-soluble component of the toner, a main peak in the region of molecular weight of from 2,000 to 25,000, a sub-peak or shoulder in the region of molecular weight of 70,000 or higher, and an Mw/Mn ratio of 8 or higher, containing 20% to 70% of a component belonging to the region of molecular weight of from 1,000 to 10,000.
Dependencies are inferred from the claim text.