| 摘要 |
PURPOSE:To prevent performance deterioration in the formation of a film for a recording layer by using polyphenylene sulfide (PPS) of thermoplastic resin as the essential component of a substrate material, doping an electron receptor thereto and filling a conductive filler, etc. therein. CONSTITUTION:The PPS is used as the essential material of the material for the substrate of an optical disk and conductive fillers such as carbon fibers or whiskers or high-strength fillers are filled therein. The electron receptor such as Lewis acid or halogen element is further doped therein. The PPS resin has the m.p. as high as 280 deg.C and since the substrate made thereof is opaque, there is no need for taking care for the change of the transparency by heating and the temp. limitation for the substrate is small in the film formation. The PPS has 60% degree of crystallinity and the reinforcing effect in a high temp. region is high if fibers or whiskers are filled therein. A considerable decrease of the resistance is resulted if the Lewis acid, etc., is doped and a conducting effect is improved and the good conductive substrate is obtainable together with the remarkably improved C/N when the fillers are further filled therein. The curve L shown in the figure is the case of only the PPS and the curve 2 is the case in which the SiC whiskers are incorporated into the PPS. |
