Patent ID: 7399568

Claim:
A resin-coated carrier for an electrophotographic developer which comprises a resin-coating layer comprising, on a core material, a polymer comprising a unit represented by the formula (1): wherein R represents -A 25 -SO 2 R 25 , R 25w , R 25x and R 25y form a combination selected from the group consisting of combinations described in (i) or (ii) below, and A 25 and R 25 form a combination selected from the group consisting of combinations described in (i-A) or (i-B) below in the case of (i), or A 25 and R 25 form a combination selected from the group consisting of combinations described in (ii-A) in the case of (ii), the combinations wherein (i) R 25w and R 25x are a hydrogen atom, and R 25y is a CH 3 group or a hydrogen atom; (i-A) A 25 is a substituted or unsubstituted aliphatic hydrocarbon structure, R 25 is a halogen atom or OR 25a , and R 25a is a substituted or unsubstituted aliphatic hydrocarbon structure, a substituted or unsubstituted aromatic ring structure, or a substituted or unsubstituted heterocyclic structure; (i-B) A 25 is a substituted or unsubstituted aromatic ring structure, or a substituted or unsubstituted heterocyclic structure, R 25 is OH, a halogen atom, ONa, OK or OR 25a , and R 25a is a substituted or unsubstituted aliphatic hydrocarbon structure, a substituted or unsubstituted aromatic ring structure, or a substituted or unsubstituted heterocyclic structure; (ii) R 25w and R 25x are independently a halogen atom or a hydrogen atom, R 25y is a CH 3 group, a halogen atom or a hydrogen atom, and at least one of R 25w , R 25x and R 25y are a halogen atom; or (ii-A) A 25 is any of a substituted or unsubstituted aliphatic hydrocarbon structure, a substituted or unsubstituted aromatic ring structure, or a substituted or unsubstituted heterocyclic structure, R 25 is OH, a halogen atom, ONa, OK or OR 25a , and R 25a is any of a substituted or unsubstituted aliphatic hydrocarbon structure, a substituted or unsubstituted aromatic ring structure, or a substituted or unsubstituted heterocyclic structure.