| 摘要 |
PURPOSE:To enhance durability against electrical and mechanical impacts and charge retention characteristics, etc., by using the surface insulating layer of a photoreceptor or a recording material consisting of 3 layers of upper, middle, and lower layers, each made of specified material. CONSTITUTION:The surface insulating layer of an image bearing material, such as photoreceptor or recording material, for retaining a toner image or an electrostatic image is composed of an upper layer made mainly of a thermoplastic resin soluble in organic solvents, a middle layer made mainly of an acrylic polymer soluble in org. solvents consisting of acrylic monomers and a hardenable resin, and a lower layer made mainly of a hardenable resin. Said upper layer is superior in surface lubricity, mold releasability, and moisture resistance, and improves surface durability, cleanability, and charge retentivity, said lower layer enhances mechanical strength of the whole insulating layers, and protects the photoconductive layer, and said middle layer strongly unites the upper and lower layers. |
