To provide a method of recovering polycarbonate resin from an unused or used recovered optical disk, or a waste optical disk made to be a defective during a manufacturing process, which uses polycarbonate resin as substrate material, and to provide a high-quality optical molded product obtained by molding recovered polycarbonate resin.
The method of recovering polycarbonate resin includes processes of crushing waste optical disk and/or recovered optical disk which has a polycarbonate resin substrate, and of chemically treating the obtained crushed material, wherein, for chemically treated material obtained in the chemically treating process, the following processes [I] and [II] are performed. The process [I] includes a process (a) of removing magnetic metal foreign matter by using a magnet and a process (b) of selecting colored foreign matter by using an optical camera and removing the colored foreign matter. The process [II] is a process of detecting the presence or absence of metal foreign matter by using a metal foreign matter detector and removing resin having the metal foreign matter.
MIHASHI KENICHI
ITO NOBUYUKI
PANAKKU KOGYO KK
| JP2007276349A | 2007-10-25 | |||
| JP2007307731A | 2007-11-29 |
Masamichi Tohei
Makoto Kataoka
Kenichi Hirasawa
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