| abstract |
The present invention provides a polyester resin tonernwhich has good fixing properties and is superior in imagenquality in a heat roller fixation system without employing annanti-offset solution, and which has a spherical or generallynspherical shape and has a small particle diameter, and anmethod of producing the same. In a toner for electrostaticnimage development comprising a binder resin and a colorant,nsaid binder resin is made of a polyester resin. Furthermore,nthe weight-average molecular weight as measured by gelnpermeation chromatography of a tetrahydrofuran-solublenfraction of said polyester resin contained in the toner isn30,000 or more and the weight-average molecular weight/number-averagenmolecular weight is 12 or more and, moreover, the areanratio of a molecular weight of 600,000 or more is 0.5% or morenand the area ratio of a molecular weight of 10,000 or less isnwithin a range of 20-80%. The toner for electrostatic imagendevelopment has a spherical or generally spherical shapenhaving the average circularity (average value of circularityndefined by (perimeter of a circle having the same area as thatnof a projected area of particles)/(perimeter of a projectednimage of particles)) of 0.97 or more. |