| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of molding a molded body of a cyclic olefin polymer excellent in transparent property and optical characteristics while suppressing supply defect of powder when resin powder of the cyclic olefin polymer is put into a molding machine and generation of foreign matter in the molded body.SOLUTION: The resin powder of the cyclic olefin polymer having equal to or more than 50 wt.% of component content whose loose bulk density is less than 0.3 g/cc, and grain size is equal to or less than 0.5 mm is pressurized and compressed to be molded under the temperature condition less than its molten temperature, then it is cracked if it is necessary, and filtered if it is necessary, and it is recovered. Thereby, powder lump having equal to or less than 1 wt.% of component content whose loose bulk density is in a range of 0.3 to 0.6 g/cc, and grain size is equal to or less than 0.5 mm is obtained and the lump is subjected to molding processing by using a heat molten molding machine. |
