External additive for toner, process for producing the same, and toner comprising the same
US10261431B2 · kind B2 · utility
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9References
19Claims
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Key dates
| Filing date | Feb 8, 2017 |
| Grant date | Apr 16, 2019 |
| Priority date | — |
| Expiry date | Feb 8, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/09733
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An external additive for a toner includes: a particulate of a polymerization product of at least one silicon compound selected from a silane compound represented by Chemical Formula 1: Si(OR1)4 (wherein R1 is a C1 to C6 monovalent hydrocarbon group) and a hydrolysis-condensation product thereof. The particulate has the following properties: a number average particle diameter of about 50 nm to about 250 nm, a first specific surface area (α) measured by a gas adsorption method of about 13 m2/g to about 80 m2/g, and true density measured by a nominal volume expansion method of about 1.9 g/cm3 to about 2.1 g/cm3.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.