US 12,124,212 B2
Toner
Shintaro Kawaguchi, Kanagawa (JP); Masatake Tanaka, Kanagawa (JP); Tatsuya Saeki, Shizuoka (JP); and Masamichi Sato, Shizuoka (JP)
Assigned to CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on May 25, 2021, as Appl. No. 17/329,740.
Claims priority of application No. 2020-095423 (JP), filed on Jun. 1, 2020.
Prior Publication US 2021/0373450 A1, Dec. 2, 2021
Int. Cl. G03G 9/093 (2006.01); C08G 63/183 (2006.01); G03G 9/08 (2006.01)
CPC G03G 9/09328 (2013.01) [C08G 63/183 (2013.01); G03G 9/0819 (2013.01); G03G 9/09335 (2013.01); G03G 9/09342 (2013.01); G03G 9/09371 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A toner, comprising:
a toner particle that comprises a core particle comprising a binder resin, the toner particle having a surface layer comprising inorganic fine particles and an organosilicon polymer;
the organosilicon polymer having a structure given by formula (T3)
R—Si(O1/2)3  (T3)
where R represents an alkyl group having 1 to 6 carbons or a phenyl group; and
a proportion of a peak area assigned to the structure given by formula (T3) relative to a total peak area for the organosilicon polymer is at least 5.0% in 29Si-NMR measurement of tetrahydrofuran insoluble-matter of the toner particle, wherein
in observation of a cross section of the toner particle using a transmission electron microscope,
with a long axis L being a chord that passes through the geometric center of the toner particle and provides the longest diameter in the toner particle cross section, with a line segment a being one of line segments provided by dividing the long axis L at a midpoint thereof,
with Arn (n=1 to 32) respectively being 32 line segments provided using the line segment a as a point of reference, by drawing a line segment from the midpoint of the long axis L to a surface of the toner particle, each line segment being shifted by 11.25°,
with RAn (n=1 to 32) being a length of each of the line segments, and
with FRAn (n=1 to 32) being a thickness of the surface layer on the Arn (n=1 to 32),
in a cross section of a toner particle for which Dtem is in a range of a toner particle weight-average particle diameter±10%,
(i) an average thickness Dav. of the surface layer is 5.0 to 100.0 nm,
(ii) the proportion of Arn line segments, for which the FRAn is not more than 5.0 nm, is not more than 20.0%,
(iii) the number of inorganic fine particles in the surface layer contacting the core particle is 16 to 30 per toner particle, and
(iv) in 100 toner particles, for which the Dtem is in a range of the toner particle weight-average particle diameter+10%, the proportion of toner particles comprising at least one inorganic fine particle present in the core particle and not in contact with the surface layer is not more than 10%
where Dtem=(RA1+RA2+RA3+RA4+RA5+RA6+RA7+RA8+RA9+RA10+RA11+RA12+RA13+RA14+RA15+RA16+RA17+RA18+RA19+RA20+RA21+RA22+RA23+RA24+RA25+RA26+RA27+RA28+RA29+RA30+RA31+RA32)/16.