Patent ID: 11914326
Assignee: KYOCERA DOCUMENT SOLUTIONS INC.
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC G  C | IPC C  G

Claim 0:
1. A positively chargeable magnetic toner comprising toner particles, wherein
the toner particles each include a toner mother particle including a polyester resin domain, a vinyl resin domain, and a magnetic powder,
a vinyl resin constituting the vinyl resin domain includes a repeating unit having a non-ring-opened oxazoline group,
a polyester resin constituting the polyester resin domain includes a repeating unit derived from tri- or higher-basic carboxylic acid,
the repeating unit derived from the tri- or higher-basic carboxylic acid has a content ratio to all repeating units derived from carboxylic acid in the polyester resin of at least 0.5% by mole and no greater than 1.5% by mole,
an area rate of an area in which the vinyl resin domain is exposed in a surface area of the toner mother particle is at least 0.02% and no greater than 1.00%, and
the magnetic toner is used as a one-component developer.