Patent ID: 8343703

Claim:
An electrostatic image developing toner, comprising: a block copolymer that contains: a block A that has a glass transition temperature of about 60° C. or more; and a crystalline block B that has a melting point of about 25° C. or more derived from an ethylenically unsaturated compound, wherein a molar fraction of a monomer unit constituting the crystalline block B is about 15 to about 35 mol % based on the entire monomer units constituting the block copolymer, and wherein the block copolymer satisfies the following equations (1) to (3): 30° C.≦[ T (0.5 MPa)− T (30 MPa)]≦80° C. (1) 60° C.≦ T (0.5 MPa) (2) T (30 MPa)≦80° C. (3) where: T(0.5 MPa) represents a temperature at which a viscosity of the block copolymer is 10 4 Pa·s when a pressure applied by a flow tester is 0.5 MPa; and T(30 MPa) represents a temperature at which a viscosity of the block copolymer is 10 4 Pa·s when a pressure applied by a flow tester is 30 MPa.