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US 12,025,951 B2Granted
Toner, two-component developer, and image-forming apparatus
AssigneeSharp Kabushiki Kaisha
InventorHiroki Maeda
Life of this patent
Estimating the term…
Abstract
The toner has a toner matrix particle containing a crystalline polyester resin. Associated silica including two or more of primary particles is present on the surface of the toner matrix particle. The coverage with associated silica onto the toner matrix particle is 1% or more to 30% or less, and the adherence strength of associated silica to the toner matrix particle is 20% or more to 90% or less.
Claims8
A toner having a toner matrix particle comprising a crystalline polyester resin,
- wherein associated silica is present on a surface of the toner matrix particle, and the associated silica is obtained by adding a tetraalkyl ammonium hydroxide compound as an association-promoting additive to a silica sol so as to bond two or more silica particles in the silica sol,
- a coverage with the associated silica onto the toner matrix particle is 1.6% or more to 13% or less, and
- an adherence strength of the associated silica to the toner matrix particle is 45% or more to 75% or less.
Dependencies are inferred from the claim text.