Toner
The toner includes a toner particle that comprising a core particle containing a resin component and a shell on a surface of the core particle, wherein the resin component comprises more than 50.0 mass % of a polyester resin comprising a monomer unit that contains a heterocyclic group, and the shell comprises at least one resin selected from the group consisting of prescribed (meth)acrylic resins and melamine resins.
1. A toner comprising a toner particle, the toner particle comprising:
a core particle containing a resin component, the resin component comprising a styrene-acrylic resin and more than 50.0 mass % of a polyester resin comprising an isosorbide monomer unit; and
a shell on a surface of the core particle, the shell comprising at least one resin selected from the group consisting of (i) melamine resins and (ii) (meth)acrylic resins comprising at least one monomer unit selected from the group consisting of a monomer unit represented by formula (2) and a 2-hydroxyethyl methacrylate monomer unit
where R 2 represents a hydrogen atom or a methyl group, wherein
the shell content is 0.7 to 2.5 mass parts per 100.0 mass parts of the resin component in the core particle, and
the toner particle is a particle obtained by forming the shell on the surface of the core particle in an aqueous medium in which the core particle is dispersed.
2. The toner according to claim 1 , wherein a content of the isosorbide monomer unit in the polyester resin is 5.0 to 35.0 mass %.
3. The toner according to claim 1 , wherein the polyester resin comprises at least one member selected from the group consisting of a structure in which an aliphatic diol is condensation-polymerized with a carboxylic acid component and a structure in which an alicyclic diol is condensation-polymerized with a carboxylic acid component.
4. The toner according to claim 1 , wherein the shell comprises the (meth)acrylic resin.
5. The toner according to claim 4 , wherein a total content of the monomer unit selected from the group consisting of monomer unit represented by formula (2) and the 2-hydroxyethyl methacrylate monomer unit in the (meth)acrylic resin is 5.0 to 35.0 mass %.
6. A method for producing a toner comprising a toner particle, comprising a step of:
forming a shell on a surface of a core particle in an aqueous medium in which the core particle is dispersed, wherein
the core particle contains a resin component, the resin component comprising a styrene-acrylic resin and more than 50.0 mass % of a polyester resin comprising an isosorbide monomer unit,
the shell comprises at least one resin selected from the group consisting of (i) melamine resins and (ii) (meth)acrylic resins comprising at least one monomer unit selected from the group consisting of a monomer unit represented by formula (2) and a 2-hydroxyethyl methacrylate monomer unit
where R 2 represents a hydrogen atom or a methyl group, and
the shell content is from 0.7 to 2.5 mass parts per 100.0 mass parts of the resin component in the core particle.