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AssigneeKonica Minolta, Inc.
InventorsHitomi Motani, Ito Koga, Tomomi Oshiba, Kishio Tamura
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Disclosed are a toner for electrostatic image development and an image formation process using the same which can achieve high varnish application property and high adhesion of a heat-fixed image to a varnish layer even when the varnish layer is formed on the fixed image formed by an image formation process of an electrophotographic system. The toner for electrostatic image development includes toner particles containing at least a binder resin, a colorant and a parting agent, and the binder resin contains a polyfunctional acrylate-modified polyester resin obtained by modification with a polyfunctional acrylate compound. In the toner for electrostatic image development, it is preferable that the toner particles have a core-shell structure, in which the surface of a core particle is coated with a shell layer, and tine polyfunctional acrylate-modified polyester resin is contained in the shell layer.
The toner for electrostatic image development according to claim 1, wherein
The toner for electrostatic image development according to claim 1, wherein, the polyfunctional acrylate-modified polyester resin has a moiety derived from the polyfunctional acrylate compound on a terminal thereof.
The toner for electrostatic image development according to claim 1, wherein the polyfunctional acrylate compound is at least one kind selected from the group consisting of 2-hydroxy-3-acryloyloxypropyl methacrylate, pentaerythritol triacrylate, glycerin dimethacrylate and 3-acryloyloxy-2,2-bis(acryloyloxy(methyl)) propionic acid.
The toner for electrostatic image development according to claim 1, wherein the polyfunctional acrylate-modified polyester resin has a glass transition point of 50 to 65° C.
The toner for electrostatic image development according to claim 1, wherein the polyfunctional acrylate-modified polyester resin has a weight average molecular weight (Mw) of 10,000 to 40,000.
The toner for electrostatic image development according to claim 1, wherein a content of the polyfunctional acrylate-modified polyester resin in the whole binder resin is 5 to 100% by mass.
The toner for electrostatic Image development according to claim 1, wherein the parting agent is contained in the toner particles in a content of 3 to 15% by mass.
The toner for electrostatic image development according to claim 1, wherein the toner particles have an average particle diameter of 3 to 10 μm in terms of a volume-based median diameter.
The toner for electrostatic image development according to claim 1, wherein the toner particles are produced by an emulsion polymerisation process,
A two-component developer comprising the toner for electrostatic image development according to claim 1, and a carrier.
An image formation process comprising:
Dependencies are inferred from the claim text.