US 12,222,677 B2
Fine particle, external additive for toner, toner, two-component developer, and method for manufacturing toner
Hiroki Watanabe, Chiba (JP); Ichiro Kanno, Chiba (JP); Masaharu Miura, Ibaraki (JP); and Hayato Ida, Ibaraki (JP)
Assigned to CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Jan. 19, 2022, as Appl. No. 17/648,330.
Claims priority of application No. 2021-009564 (JP), filed on Jan. 25, 2021; application No. 2021-009603 (JP), filed on Jan. 25, 2021; application No. 2021-141208 (JP), filed on Aug. 31, 2021; and application No. 2021-211031 (JP), filed on Dec. 24, 2021.
Prior Publication US 2022/0236654 A1, Jul. 28, 2022
Int. Cl. G03G 9/097 (2006.01); G03G 9/08 (2006.01)
CPC G03G 9/09775 (2013.01) [G03G 9/0819 (2013.01); G03G 9/0821 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A fine particle, comprising:
a silicon polymer having a siloxane group and a silanol group;
the fine particle having a moisture adsorption amount of 1.0 to 22.0 mg/g at a temperature of 30° C. and a humidity of 80% RH,
an amount of the silanol group of the fine particle measured by a titration method using KOH being 0.012 to 0.120 mmol/g; and
a number average particle diameter of primary particle of the fine particle being 0.05 to 0.30 μm, wherein in a chart obtained by measurement of 29Si-NMR of the fine particle
S3/A≤0.40
0.20≤S4/A≤0.50 and
0.40≤S2/A≤0.70
where a total peak area corresponding to the silicon polymer is denoted by A, a peak area corresponding to a structure represented by formula (a) is denoted by S3, a peak area corresponding to a structure represented by formula (b) is denoted by S4, and a peak area corresponding to a structure represented by formula (c) is denoted by S2,

OG Complex Work Unit Chemistry

OG Complex Work Unit Chemistry
where R1 represents an alkyl group having 1 to 6 carbon atoms, and R2 and R3 independently represent an alkyl group having 1 to 6 carbon atoms.