| 摘要 |
PURPOSE:To obtain a dry type developing toner having good fluidity and superior storage stability, and not causing blocking and toner filming phenomena, by mixing fine titanium oxide powder made hydrophobic with alkylalkoxysilane and the main toner particles. CONSTITUTION:A mixture of about 88pts.wt. fixing component, such as styrenebutyl acrylate copolymer, about 10pts.wt. carbon and about 2pts.wt. charge controller is melted and kneaded, cooled, and pulverized to obtain a dry type toner having 10mum average particle diameter. A toner mixture having about 60% voids and good fluidity is obtained by adding about 1pt.wt. octyltrimethoxysilane to control hydrophobic degree to 60%. A dry type developer is obtained by mixing 10g of this mixture with 190g iron powder as a carrior. The developer thus obtained did not cause blocking even when it is kept at 60 deg.C for 12hr, filming of the toner to a photoreceptor was not found even after continuous operation of a large number of copies as many as 100,000, and a faithful stabilized image is always obtained. |
