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US 11,914,326 B2Granted
Magnetic toner
AssigneeKYOCERA Document Solutions Inc.
InventorMasami Tsujihiro
Life of this patent
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Abstract
A magnetic toner includes toner particles. The toner particles each include a toner mother particle. The toner mother particle includes 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. 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%.
Claims6
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.
3 more elements
Dependencies are inferred from the claim text.