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Title:
TWO-COMPONENT DEVELOPER
Document Type and Number:
WIPO Patent Application WO/2023/281880
Kind Code:
A1
Abstract:
With respect to a two-component developer according to the present invention, toner particles comprise toner base particles and external additive particles that contain strontium titanate particles. The first content ratio, which is the content ratio of the strontium titanate particles to the mass of the toner base particles, is 0.30% to 0.90% by mass. Each carrier particle comprises a carrier core and a coat layer. The coat layer contains a coat resin, which contains a silicone resin, and barium titanate particles. The number average primary particle diameter of the barium titanate particles is 100 to 500 nm. The second content ratio, which is the content ratio of the coat layer to the mass of the carrier core, is 2.0% to 4.0% by mass. The third content ratio, which is the content ratio of the barium titanate particles to the mass of the coat resin, satisfies formula (1) (X × 10) ≤ Z ≤ 45.0. In the formula (1), X represents the first content ratio; and Z represents the third content ratio.

Inventors:
TERASAKI KOHEI (JP)
SHIMIZU TAMOTSU (JP)
KURANO YUSUKE (JP)
YAMASHITA MASASHI (JP)
UCHIHASHI YUMA (JP)
Application Number:
PCT/JP2022/016378
Publication Date:
January 12, 2023
Filing Date:
March 31, 2022
Export Citation:
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Assignee:
KYOCERA DOCUMENT SOLUTIONS INC (JP)
International Classes:
G03G9/097; G03G9/113
Foreign References:
JP2007033631A2007-02-08
JPH1010770A1998-01-16
JP2020181051A2020-11-05
Attorney, Agent or Firm:
MAEI Hiroyuki (JP)
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