| 摘要 |
PURPOSE:To obtain molded products having excellent heat shock resistance after performing the integral molding step with a metal as well as toner resistance by using ethylene-ethylene acrylate copolymer as a binder. CONSTITUTION:Within this plastic magnet composition, the content of isotropic ferromagnetic powder is specified to exceed 50wt.% but not to exceed 80wt.% while that of ethylene-ethylene acrylate copolymer in melt index exceeding 5 is specified to exceed 5wt.%. Besides, polypropylene resin in melt index exceeding 5 is specified to exceed 2wt.% but not to exceed 25wt.% while the total weight of these two resins is specified to exceed 20wt.% but not to exceed 50wt.%. Through these procedures, the molded products having excellent heat shock resistance after performing the integral molding step as well as the excellent toner resistance can be obtained further enabling the electrical characteristics to be controlled while sustaining the magnetic force as well as making multipole magnetization feasible. |
