| 摘要 |
PURPOSE:To obtain a complete goods value, having no yellowing in the sterilization caused by an ionizing radiation and having toughness and strength, by irradiating an ionizing radiation to moldings composed of the composition substance of a polypropylene glycol included polycarbonate resin before heat treating. CONSTITUTION:In this sterilization, an ionizing radiation is irradiated to moldings composed of the composition substance of a polypropylene glycol included polycarbonate resin before heat treating. Polypropylene glycol used has a molecular weight range of 2,000-6,000, and contents are 0.1-2.0weight% to the composition substance of the polycarbonate resin and preferably 0.5-1.0weight%. In this method, yellowing produced by the ionizing radiation is discolored by more heat treating, and the heat treating is made at temperatures of 35-130 deg.C preferably 40-100 deg.C in order to effectively discolor the composition substance of the yellowed polycarbonate resin in a short time. |
