Optical polycarbonate resin molding material

Details Optical polycarbonate resin molding material Optical polycarbonate resin molding material

2005-02-22

2005-02-22

Chen, Vivian (Department: 1773)

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Particulate matter

C428S397000, C428S398000, C428S401000, C428S064200, C428S064400, C428S064700

Reexamination Certificate

active

06858298

ABSTRACT:
An optical polycarbonate resin molding material comprising pellets formed from a polycarbonate resin, wherein the pellets satisfy the following properties (1) and (2):(1) an average of surface areas (hereinafter referred to as “cross sectional areas”) in cutting cross sections of the pellets is 3.0 to 6.5 mm2, and a standard deviation thereof is not larger than 0.65 mm2, and(2) an average of ratios of long diameters to short diameters (hereinafter referred to as “long diameter/short diameter”) in the cutting cross sections of the pellets is 1.3 to 1.7, and a standard deviation thereof is 0.08 to 0.15, and an optical disc substrate formed from the material.According to the present invention, when the aromatic polycarbonate resin pellets which satisfy the properties (1) and (2) are used for molding, an optical disc substrate which hardly undergoes occurrence of silver streaks can be obtained, and operations at the time of molding can be facilitated.

REFERENCES:
patent: 6066398 (2000-05-01), Ueda
patent: 6245405 (2001-06-01), Kawano
patent: 20030216538 (2003-11-01), Kawano et al.
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patent: 07-052272 (1995-02-01), None
patent: 09-183836 (1997-07-01), None
patent: 11-035692 (1999-02-01), None
patent: 2000-204148 (2000-07-01), None
patent: 2000-242971 (2000-09-01), None

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