公开(公告)号：US12282294B2

公开(公告)日：2025-04-22

申请号：US17590315

申请日：2022-02-01

Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.

Inventor： Akinori Terada ,  Takahiro Danno ,  Osamu Ieda

IPC: G03G9/097 ,  G03G9/08 ,  G03G9/093 ,  G03G15/08

Abstract: A toner particle includes a core particle including a binder resin, and a plurality of fine particles that are smaller than the core particle and that are attached to a surface of the core particle. The fine particles include silica fine particles, and inorganic fine particles having a band gap energy of 2.5 to 7.0 eV and a relative permittivity of 30 to 100. The toner particle has a content of titanium dioxide of less than 1% by mass.

公开(公告)号：US20210302852A1

公开(公告)日：2021-09-30

申请号：US17050954

申请日：2019-05-23

Applicant: Hewlett-Packard Development Company, L.P.

Inventor： Keiichi Ishikawa ,  Takahiro Danno ,  Osamu Ieda

IPC: G03G9/087 ,  G03G9/08 ,  C08G63/20 ,  C08G63/672

Abstract: A binder resin for toner includes an amorphous polyester resin and a crystalline polyester resin. The amorphous polyester resin has a weight average molecular weight of 5,000 to 30,000, inclusively, and contains 1 mol % to 10 mol %, inclusively, of a constituent unit having a pendant group with 3 to 32, inclusively, carbon atoms. The crystalline polyester resin has a weight average molecular weight of 5,000 to 15,000, inclusively. The binder resin has an endothermic amount Tg2nd-dH of 5 J/g to 50 J/g, inclusively.