Title:
POLYCARBONATE MATERIAL FOR OPTICAL DISK SUBSTRATE
Document Type and Number:
Japanese Patent JPH11166113
Kind Code:
A
Abstract:
To provide a polycarbonate material for an optical disk substrate having an excellent transferring property, moldability, impact resistance, transparency, productivity and a decreased warpage.
A polycarbonate is blended with 200-10,000 ppm of a polycaprolactone having a number average molecular weight of 1,000-50,000. It is preferable that the viscosity average molecular weight of the polycarbonate is 12,000-20,000. The optical disk substrate is preferably formed of a single disk of the polycarbonate having a thickness of 0.6 mm or formed by laminating two of such polycarbonate disks.
Inventors:
UEDA MASAYA
SHIMAOKA GORO
NAKADA MICHIO
MARUYAMA HIROYOSHI
SHIMAOKA GORO
NAKADA MICHIO
MARUYAMA HIROYOSHI
Application Number:
JP33278197A
Publication Date:
June 22, 1999
Filing Date:
December 03, 1997
Export Citation:
Assignee:
MITSUBISHI ENG PLAST CORP
International Classes:
B29D17/00; C08L69/00; G11B7/24027; G11B7/24047; G11B7/24073; G11B7/24079; G11B7/24085; G11B7/2534; B29K69/00; (IPC1-7): C08L69/00
Attorney, Agent or Firm:
Hasegawa Moji
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