Patent ID: 7344815

Claim:
A toner for developing an electrostatic image comprising a resin and a colorant in which an arithmetic average of shape coefficient SF-1 of the toner particles calculated by Equation 1 is from 125 to 170 and a ratio of that to an arithmetic average of the shape coefficient SF-2 of the toner particles calculated by Equation 2, SF-1/SF-2, is from 1.10 to 1.52 and the ratio of the toner particles having a circle corresponding diameter measured by a flow particle image analyzer of from not less than 0.60 to less than 1.00 μm is not more than 5.0% in number, and the resin is a polymer comprising radical polymerized monomers and 0.1 to 15 weight % of the monomers based on the total weight of monomers, have a basic group or an acidic group, SF - 1 = ( Maximum ⁢ ⁢ diameter ⁢ ⁢ of ⁢ ⁢ toner ⁢ ⁢ particle ) 2 ( Projection ⁢ ⁢ area ⁢ ⁢ of ⁢ ⁢ toner ) × 100 ⁢ π 4 Formula ⁢ ⁢ ( 1 ) SF - 2 = ( Circumference ⁢ ⁢ of ⁢ ⁢ toner ⁢ ⁢ particle ) 2 ( Projection ⁢ ⁢ area ⁢ ⁢ of ⁢ ⁢ toner ) × 100 4 ⁢ π . Formula ⁢ ⁢ ( 2 )