Developer regulating member, developing device, process cartridge and electrophotographic image forming apparatus

A developing device, comprising:

• a developer carrier;
• a developer regulating member disposed in contact with a surface of the developer carrier;
• and
• a developer container storing a developer,
• wherein the developer regulating member comprises a thermoplastic acrylic resin, and
• wherein the thermoplastic acrylic resin has a first endothermic peak having a peak top at +50° C. or more and a second endothermic peak having a peak top at +20° C. or less on a differentiation curve of a DSC curve obtained when temperature is raised from −100° C. to 150° C. at a rate of temperature rise of 20.0° C./min using differential scanning calorimetry (DSC).

A process cartridge detachably attachable to a body of an electrophotographic image forming apparatus, the process cartridge comprising:

• a developer carrier;
• a developer regulating member disposed in contact with a surface of the developer carrier;
• and
• a developer container storing a developer,
• wherein the developer regulating member comprises a thermoplastic acrylic resin, and
• wherein the thermoplastic acrylic resin has a first endothermic peak having a peak top at +50° C. or more and a second endothermic peak having a peak top at +20° C. or less on a differentiation curve of a DSC curve obtained when temperature is raised from −100° C. to 150° C. at a rate of temperature rise of 20.0° C./min using differential scanning calorimetry (DSC).