| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an electrostatic image developer capable of forming good image quality and not only maintaining this image quality for a long period but also forming always good developed images even in fluctuating environments from low temperature and low humidity to high temperature and high humidity. SOLUTION: The electrostatic image developer comprises colored thermoplastic resin substantially spherical grains, fine particles firmly fixed to the surfaces of these colored resin grains, and ultrafine particles deposited on the surfaces of the resin grains including the fine fixed particles, and capable of freely moving on their surfaces. These fixed particles are at least one kind of mixture of (1) a metal oxide compound and (2) fine organic particles having a molecular weight of 200-5,000, or organic fine particles having a complex structure or fine resin particles having a functional group equivalent of <=1500.</p> |
