POLYCARBONAT FORMASSE FÜR OPTISCHE VERWENDUNG UND SUBSTRAT FÜR OPTISCHE PLATTE

• Main Author: DOHI, YUTAKA
• Format: Patent
• Language: German
• Published: 15.03.2009
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS; INFORMATION STORAGE; INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; PHYSICS; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

The present invention relates to a polycarbonate resin molding material for optical use which contains substances (A) having a 5 % weight reduction start temperature measured by thermogravimetric analysis of 400 DEG C or less in a total amount of 1 wt% or less and to a polycarbonate resin molding material for optical use which contains substances (A) having a 5 % weight reduction start temperature measured by thermogravimetric analysis of 400 DEG C or less in a total amount of 1 wt% or less and a sodium compound in an amount of 1 ppm or less in terms of metal sodium. The present invention also relates to optical disk substrates formed from these molding materials. According to the present invention, use of each of the above molding materials makes possible the continuous molding of an optical disk substrate and the obtained optical disk substrate has high quality and can retain reliability for a long time as an optical disk for a high-density recording