| 摘要 |
PURPOSE:To obtain a high electric resistance and high dielectric constant in combination by covering a magnetic core material with a high-resistance resin layer contg. a specific high-dielectric constant polymer. CONSTITUTION:The magnetic core material is covered with the high-resistance resin layer contg. the high-dielectric constant polymer expressed by formula I to form the carrier. In the formula I, R denotes a polysaccharide polymer, such as cellulose, starch, glycogen, charoin prulane. The high-dielectric constant polymer expressed by the formula I has a cyano group (-CN) of a large polarity in the side chain and, therefore, the polymer which exhibits a high dielectric constant by forming dipole moment in an electric field and has 1X10<11> to 1X10<13>OMEGAcm electric resistance is used. The excellent image reproducibility is obtd. in this way without deteriorating the characteristics even in the long- term image formation. |
