| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a noise suppression sheet with high noise suppression effect and excellent flame retardancy. <P>SOLUTION: The noise suppression sheet consists of a compound magnetic material obtained by mixing a soft magnetic flat powder, a polymer binder, and a metal hydroxide, where the aspect ratio (mean particle size/average thickness) of the soft magnetic flat powder is 15 or more and 90 or less, the polymer binder is a thermoplastic polymer binder, the metal hydroxide contains at least either one of magnesium hydroxide or aluminium hydroxide, the blending ratio of the compound magnetic material is 58 mass% or more and 68 mass% or less of the soft magnetic flat powder, 7 mass% or more and 17 mass% or less of the polymer binder and 15 mass% or more and 30 mass% or less of the metal hydroxide. The filling ratio (true specific gravity/theoretical specific gravity) of the noise suppression sheet with the compound magnetic material molded into a sheet is 80% or more and 100% or less. <P>COPYRIGHT: (C)2012,JPO&INPIT |
