Two-component developer

A two-component developer comprising:

• a toner;
• and
• a magnetic carrier,
• wherein the magnetic carrier includes a magnetic carrier core and a resin coated layer that covers a surface of the magnetic carrier core, and
• the resin coated layer has at least one structure selected from the group consisting of a structure represented by Formula (A), a structure represented by Formula (B), and a structure represented by Formula (C),
• in Formula (A), R represents an alkyl group having 1 or more and 10 or less carbon atoms,
• in Formula (C), X represents a carbon atom or a silicon atom, and Ra and Rb each independently represent a hydrogen atom or an alkyl group having 1 or more and 10 or less carbon atoms,
• the toner is a toner including a composite particle on a surface of a toner particle,
• the composite particle includes
• a fine particle A that uses, as a binder component, an organic silicon compound having a siloxane bond, and
• a fine particle B that is present in a state of being partially embedded in a surface of the fine particle A,
• the composite particle is formed of a primary particle having a number average particle diameter of 0.03 μm or greater and 0.30 μm or less,
• in DD-MAS measurement of solid-state 29Si-NMR of the fine particle A, in a case where a proportion of silicon atoms present in a state of the following unit (a) in all silicon atoms is defined as Xa (%), a proportion of silicon atoms present in a state of the following unit (b) in all silicon atoms is defined as Xb (%), and a proportion of silicon atoms present in a state of the following unit (c) is defined as Xc (%), content proportions of Xa, Xb, and Xc satisfy Expressions (1) and (2),
• Xa
• +
• Xb
• +
• Xc
• ≥
• 80
• ⁢
• %
• (
• 1
• )
• Xb
• +
• Xc
• ≥
• 30
• ⁢
• %
• (
• 2
• )
• in Formulae (b) and (c), R1 and R2 each independently represent an alkyl group having 1 or more and 6 or less carbon atoms,
• in the fine particle B of the composite particle, an average value of an embedment ratio represented by the following equation is 30% or greater and 90% or less,
• embedment
• ⁢
• ratio
• ⁢
• (
• %
• )
• ⁢
• of
• ⁢
• fine
• ⁢
• particle
• ⁢
• B
• =
• (
• depth
• ⁢
• of
• ⁢
• fine
• ⁢
• particle
• ⁢
• B
• ⁢
• embedded
• ⁢
• in
• ⁢
• fine
• ⁢
• particle
• ⁢
• A
• /
• diameter
• ⁢
• of
• ⁢
• fine
• ⁢
• particle
• ⁢
• ⁢
• B
• )
• ×
• 100
• in DD-MAS measurement of solid-state 29Si-NMR of the composite particle, a peak PD1 corresponding to a silicon atom represented by Sia in a structure represented by Formula (3), a peak PT1 corresponding to a silicon atom represented by Sib in a structure represented by Formula (4), a peak PT2 corresponding to a silicon atom represented by Sic in a structure represented by Formula (5), a peak PQ1 corresponding to a silicon atom represented by Sid in a structure represented by Formula (6), a peak PQ2 corresponding to a silicon atom represented by Sie in a structure represented by Formula (7), and a peak PQ3 corresponding to a silicon atom represented by Sif in a structure represented by Formula (8) are observed, and
• in a case where an area of the peak PD1 is defined as SD1, an area of the peak PT1 is defined as ST1, an area of the peak PT2 is defined as ST2, an area of the peak PQ1 is defined as SQ1, an area of the peak PQ2 is defined as SQ2, an area of the peak PQ3 is defined as SQ3, and an area of all peaks corresponding to all silicon atoms is defined as SSi, Expression (9) is satisfied,
• in Formulae (3) to (5), R3 and R4 each independently represent an alkyl group having 1 or more and 6 or less carbon atoms,
• 0.1
• ≤
• SD
• ⁢
• 1
• SSi
• +
• 2
• ×
• ST
• ⁢
• 1
• SSi
• +
• ST
• ⁢
• 2
• SSi
• +
• 3
• ×
• SQ
• ⁢
• 1
• SSi
• +
• 2
• ×
• SQ
• ⁢
• 2
• SSi
• +
• SQ
• ⁢
• 3
• SSi
• ≤
• 0.3
• .
• (
• 9
• )