Developer carrying member, and developing assembly
AssigneeCanon Kabushiki Kaisha
InventorsTatsuki Fukui, Tetsuya Yano, Takashi Kenmoku, Chieko Mihara, Ako Kusakari, Norikazu Fujimoto
Life of this patent
Estimating the term…
Abstract
A developer carrying member is disclosed which can prevent a toner from being excessively charged in a developing assembly while keeping the charge quantity of the toner at a somewhat higher level, and seldomly causes toner melt adhesion to the developer carrying member. The developer carrying member contains a polymer having a unit represented by the chemical formula (1):
Claims7
A developer carrying member used in a developing assembly by means of which a latent image formed on an electrostatic latent image bearing member is developed and rendered visible by using a developer having been transported by a developer carrying member;
- the developer carrying member having at least a substrate and a resin layer formed on the substrate;
- said resin layer comprising a binder resin which contains at least a polymer having a unit represented by the following chemical formula (1):
- wherein R represents -A25-SO2R25, and R25w, R25x and R25y are each selected from combination recited in the following (i) or (ii), where, in the case of (i), A25 and R25 are each selected from combination recited in the following (i-A) or (i-B), and, in the case of (ii), A25 and R25 are each selected from combination recited in the following (ii-A):
- (i) R25w and R25x are each independently a hydrogen atom, and R25y is a CH3 group or a hydrogen atom;
- (i-A) A25 is a substituted or unsubstituted aliphatic hydrocarbon structure;
- and R25 is a halogen atom or OR25a, where R25a is a substituted or unsubstituted aliphatic hydrocarbon structure, a substituted or unsubstituted aromatic ring structure, or a substituted or unsubstituted heterocyclic ring structure;
- (i-B) A25 is a substituted or unsubstituted aromatic ring structure, or a substituted or unsubstituted heterocyclic ring structure;
- and R25 is OH, a halogen atom, ONa, OK or OR25a, where R25a is a substituted or unsubstituted aliphatic hydrocarbon structure, a substituted or unsubstituted aromatic ring structure, or a substituted or unsubstituted heterocyclic ring structure;
- (ii) R25w and R25x are each independently a halogen atom or a hydrogen atom, and R25y is a CH3 group, a halogen atom or a hydrogen atom, provided that at least one of R25w, R25x and R25y is a halogen atom;
- and
- (ii-A) A25 is a substituted or unsubstituted aliphatic hydrocarbon structure, a substituted or unsubstituted aromatic ring structure, or a substituted or unsubstituted heterocyclic ring structure;
- and R25 is OH, a halogen atom, ONa, OK or OR25a, where R25a is a substituted or unsubstituted aliphatic hydrocarbon structure, a substituted or unsubstituted aromatic ring structure, or a substituted or unsubstituted heterocyclic ring structure.
A developing assembly in which a developer held in a developer container is held on a developer carrying member and a thin layer of the developer is formed on the developer carrying member by the aid of a developer layer thickness control member, during which the developer is transported to a developing zone which faces a latent image bearing member and in which a latent image formed on the latent image bearing member is developed into a visible image by using the developer, wherein;
- said developer carrying member has at least a substrate and a resin layer formed on the substrate, and the resin layer comprises a binder resin which contains at least a polymer having a unit represented by the following following formula (1):
- wherein R represents -A25-SO2R25, and R25w, R25x and R25y are each selected from combination recited in the following (i) or (ii), where, in the case of (i), A25 and R25 are each selected from combination recited in the following (i-A) or (i-B), and, in the case of (ii), A25 and R25 are each selected from combination recited in the following (ii-A):
- (i) R25w and R25x are each independently a hydrogen atom, and R25y is a CH3 group or a hydrogen atom;
- (i-A) A25 is a substituted or unsubstituted aliphatic hydrocarbon structure;
- and R25 is a halogen atom or OR25a, where R25a is a substituted or unsubstituted aliphatic hydrocarbon structure, a substituted or unsubstituted aromatic ring structure, or a substituted or unsubstituted heterocyclic ring structure;
- (i-B) A25 is a substituted or unsubstituted aromatic ring structure, or a substituted or unsubstituted heterocyclic ring structure;
- and R25 is OH, a halogen atom, ONa, OK or OR25a, where R25a is a substituted or unsubstituted aliphatic hydrocarbon structure, a substituted or unsubstituted aromatic ring structure, or a substituted or unsubstituted heterocyclic ring structure;
- (ii) R25w and R25x are each independently a halogen atom or a hydrogen atom, and R25y is a CH3 group, a halogen atom or a hydrogen atom, provided that at least one of R25w, R25x and R25y is a halogen atom;
- and
- (ii-A) A25 is a substituted or unsubstituted aliphatic hydrocarbon structure, a substituted or unsubstituted aromatic ring structure, or a substituted or unsubstituted heterocyclic ring structure;
- and R25 is OH, a halogen atom, ONa, OK or OR25a, where R25a is a substituted or unsubstituted aliphatic hydrocarbon structure, a substituted or unsubstituted aromatic ring structure, or a substituted or unsubstituted heterocyclic ring structure.
Dependencies are inferred from the claim text.