OPTICAL DISK

PURPOSE:To obtain an optical disk having superior optical uniformness causing less retardation and having high sensitivity for reading of information recorded in the disk by using a specified polyetherimide resin as the base material. CONSTITUTION:A polyetherimide resin expressed by the formula I is...

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Bibliographic Details
Main Authors TAJIMA TETSUO, SHOJI FUSAJI, SUDO RYOICHI, MIWA HIROAKI
Format Patent
LanguageEnglish
Published 02.05.1988
Subjects
CHEMISTRY
COLOUR PRINTING
COMPOSITIONS BASED THEREON
INFORMATION STORAGE
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER
LINING MACHINES
MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
METALLURGY
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICS
ORGANIC MACROMOLECULAR COMPOUNDS
PERFORMING OPERATIONS
PHYSICS
PRINTING
PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES
STAMPS
THEIR PREPARATION OR CHEMICAL WORKING-UP
TRANSPORTING
TYPEWRITERS
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Summary:PURPOSE:To obtain an optical disk having superior optical uniformness causing less retardation and having high sensitivity for reading of information recorded in the disk by using a specified polyetherimide resin as the base material. CONSTITUTION:A polyetherimide resin expressed by the formula I is used as the base material. In the formula I, R1 and R2 are H or methyl; R3 is particularly pref. a group expressed by the formulas II-V; n is pref. 5-5,000, particularly 20-4,000 (n is the number average polymn. degree). If n is <5, the optical disk will be warped by heat and influenced easily by the change of torsion, etc. If n is >5,000, the molding will become remarkably difficult. By this constitution, the retardation characteristic of the disk will become smaller, and the optical uniformness will be superior, and the sensitivity for reading information recorded in the disk will become higher.
Bibliography:Application Number: JP19860245253