Toner for developing electrostatic charge image and electrostatic charge image developer
AssigneeFUJIFILM Business Innovation Corp.
InventorsDaisuke Ishizuka, Keita Yamamoto
Life of this patent
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Abstract
A toner for developing an electrostatic charge image contains toner particles that contain binder resins including an amorphous resin and a crystalline resin and also contain an oligomer. The molecular weight distribution curve of the toner measured by gel permeation chromatography has its highest peak in a range of molecular weights from 5000 to 50000 and a peak or shoulder in a range of molecular weights from 500 to 5000. In a cross-sectional observation of the toner particles, domains of the crystalline resin have an average length of major axis of 100 nm or more and 1000 nm or less.
Claims9
A toner for developing an electrostatic charge image, the toner comprising:
- toner particles that contain binder resins including an amorphous resin having a weight-average molecular weight of 6000 or more and 200000 or less and a crystalline resin having a weight-average molecular weight of 5000 or more and 45000 or less and also contain an oligomer having a weight-average molecular weight of 500 or more and 5000 or less, wherein:
- in a cross-sectional observation of the toner particles, domains of the crystalline resin have an average length of major axis of 100 nm or more and 1000 nm or less,
- wherein 0.9≤Wc/Wo≤15, where Wc and Wo represent an entire content of all crystalline resin and an entire content of all oligomer, respectively, of the toner particles.
Dependencies are inferred from the claim text.