| 摘要 |
PURPOSE:To satisfy high performance and high quality such as reproducing performance for sound or the like, environmental-resistance and sense of depth by forming the titled cassette halves by a polypropylene resin component where the volume percentage of an inorganic reinforcement agent occupied in the component is <=50vol% and the specific gravity of the compound is >=1.8. CONSTITUTION:The titled cassette halves are formed by employing the polypropylene resin component where the volume percentage of the inorganic reinforcement agent is below 50vol% and the specific gravity of the compound is over 1.8. When the volume percentage of the inorganic reinforcement agent occupied in the compound exceeds 50vol%, the forming processing performance of the compound is deteriorated and the forming by injection molding or the like is made difficult. Moreover, if the specific gravity of the compound is less than 1.8, no high function nor high quality is attained. Furthermore, zinc oxide is used as the inorganic reinforcement agent in the compound and the weight percentage of the zinc oxide is preferably to be shared by 20wt% or over.
|
