OPTICAL DISK SUBSTRATE CONSISTING OF ALICYCLIC POLYOLEFIN

PROBLEM TO BE SOLVED: To provide an optical disk substrate having a high light transmittance, little haze, low water absorption and a low index of double refraction. SOLUTION: The optical disk substrate consists of an alicyclic polyolefin obtained by hydrogenating an aromatic polyolefin in the prese...

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Hauptverfasser:	HASHIZUME KIYOSHIGE, IWATA KAORU, KONO KAZUTERU, MATSUMURA SHUNICHI
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G CHEMISTRY COMPOSITIONS BASED THEREON GENERAL PROCESSES OF COMPOUNDING INFORMATION STORAGE INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS PHYSICS THEIR PREPARATION OR CHEMICAL WORKING-UP WORKING-UP
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Zusammenfassung:	PROBLEM TO BE SOLVED: To provide an optical disk substrate having a high light transmittance, little haze, low water absorption and a low index of double refraction. SOLUTION: The optical disk substrate consists of an alicyclic polyolefin obtained by hydrogenating an aromatic polyolefin in the presence of a hydrogenation catalyst and satisfying the following conditions (1)-(4); (1) the rate of hydrogenation of aromatic rings is 90-99.5%, (2) the alicyclic polyolefin does not show a peak and does not substantially show a signal in the range of 6.3-6.8 ppm in its IH-NMR spectrum measured in heavy chloroform at room temperature, (3) the reduction viscosity (in toluene, 0.5g/dl, 30 deg.C) is >=0.2 and (4) the thermal deformation temperature is >=80 deg.C.