| 摘要 |
<p>PURPOSE: To suppress the scattering of a toner and to improve an image by incorporating toner particles contg. a fixing resin made of a compsn. contg. specified styrene-acrylic resin and a specified amt. of magnetic powder and a specified carrier. CONSTITUTION: This two-component developer contains toner particles contg. a fixing resin and magnetic powder dispersed in the resin and a carrier. The fixing resin is made of a compsn. contg. styreneacrylic resin having anionic polar groups, a mol.wt. peak in the range of 4,000-30,000, a wt. average mol.wt. of 70,000-200,000 and an acid value of 4-20. The magnetic powder is contained in the toner particles by 0.1-5 pts.wt. per 100 pts.wt. of the fixing resin. The particles of the carrier contain a thermoplastic resin made of a resin compsn. having cationic polar groups and high resistance powder dispersed in the thermoplastic resin and have 50-150μm vol. base average particle diameter. The high resistance powder has >=1×10<5>Ω.cm resistivity.</p> |
