Title:
光ディスク基板用ポリカーボネート成形材料
Document Type and Number:
Japanese Patent JP3611950
Kind Code:
B2
Abstract:
The present invention relates to a polycarbonate molding material for optical discs, comprising pellets which comprises a polycarbonate with a viscosity-average molecular weight of 10,000 to 18,000; has an average length of 2.5 to 3.5 mm; and has an average longer diameter of the sectional ellipse of 2.60 to 3.2 mm, not less than 70% of said pellets having a length falling within the range of +/-0.08 mm from the mean value of length and a longer diameter falling within the range of +/-0.12 mm from the mean value of longer diameter.
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Inventors:
Ueda Masaya
Application Number:
JP21119897A
Publication Date:
January 19, 2005
Filing Date:
July 23, 1997
Export Citation:
Assignee:
Mitsubishi Engineering Plastics Co., Ltd.
International Classes:
B29B9/06; B29C45/00; B29D17/00; C08J3/12; C08L69/00; G11B7/253; G11B7/26; H05B6/78; B29K69/00; B29L17/00; (IPC1-7): C08J3/12; B29B9/06; G11B7/26
Domestic Patent References:
| JP7052272A |
Attorney, Agent or Firm:
Shisei Patent Office
Hajime Hasegawa
Sumiko Matsuda
Hajime Hasegawa
Sumiko Matsuda