| 摘要 |
PURPOSE:To improve electromagnetic conversion characteristics and running durability by incorporating specific vinyl compds. contg. dialkylaminoalkyl groups into a magnetic layer and projecting radiations thereon. CONSTITUTION:One or more kinds of the compds. selected from the formulas I-IV having the dialkylaminoalkyl groups are incorporated into the magnetic layer and the radiations are projected on said layer. The excellent electromagnetic conversion characteristics and running durability are thereby obtd. In formulas I-IV, (m); 1-4, R1, R2, H or alkyl group of 1-6C, R3; H, CH3, R<4>, R<5>; H or alkyl group of 1-4C. |
