US Patent 7115349 Toner

Provided is toner which is excellent in developing property, transferring property, and fixing property, hardly affected by its surrounding, and has good endurance. The toner has a peak temperature of maximum endothermic peak in the range of 60 to 100° C. in an endothermic curve of differential scanning calorimetry (DSC) measurement;silica particles in the toner contain a titanium element; andthe silica particles satisfy the following expressions.0.7≦(Ia1/Ib1)≦2.00.7≦(Ia2/Ib2)≦2.0where Ia1 represents a maximum intensity in the case of 2θ=25.3 deg, Ib1 represents a mean intensity in the cases of 2θ=25.3 deg+2.0 deg. and of 2θ=25.3 deg.−2.0 deg., Ia2 represents a maximum intensity in the case of 2θ=27.5 deg and Ib2 represents a mean intensity in the cases of 2θ=27.5. deg+2.0 deg. and of 2θ=27.5 deg.−2.0 deg.