Polycarbonate resin composition for the production of a substrate for an optical information medium
US6747080B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 7, 2001 |
| Grant date | Jun 8, 2004 |
| Priority date | — |
| Expiry date | Mar 7, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31507
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Disclosed is a polycarbonate resin composition for the production of a substrate for an optical information medium, comprising 100 parts by weight of a polycarbonate resin, and 0.0005 to 1.0 part by weight of a mold release agent, wherein the composition exhibits a relative viscosity (&eegr;r) within the range of from 1.17 to 1.19, the relative viscosity (&eegr;r) being defined as the ratio (&eegr;/&eegr;o) of viscosity value (&eegr;) (25° C.) of a methylene chloride solution of the composition (concentration: 0.005 g/cm3) to viscosity value (&eegr;o) (25° C.) of methylene chloride, and wherein the relative viscosity (&eegr;r) of the composition and a melt index (MI) (JIS K 7210, at 280° C., under a load of 2.16 kg) of the composition satisfy the following formulae (I) and (II):&eegr;r≧−0.0723 log MI+1.316  (I) and &eegr;r≦−0.0723 log MI+1.324  (II).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.