专利名称：OPTICAL DISK AND PRODUCTION THEREOF 发明人：UNNO MORIMICHI,ASANO HIDEKI,KOYAMA TORU
杏仁功效
周五的英语申请号：JP17104287
申请日：19870710
公开号：JPS6416688A
公开日：
19890120
春天古诗
专利内容由知识产权出版社提供
摘要：PURPOSE:To enhance heat resistance, reduce optical distorsion and prolong uful life, by forming a substrate of an optical disk from a resin comprising a specified polysulfone resin. CONSTITUTION:The substrate of an optical disk is formed from a resin comprising a polysulfone resin shown by formula I or II, wherein each of U and V is H or a 1-6C aliphatic hydrocarbon group, the group -X-Y-Z- is a shown by formula III or IV, and the group -X'-Y'-Z'- is the group -X-Y-Z- or a group shown by formula V. The resin comprising the polysulfone resin is preferably injection molded at a cylinder temperature of at least 370 deg.C and a mold temperature of at least 120 deg.C. When the optical disk is produced by injection molding using the polysulfone resin, stress relaxation occurs during a cooling process becau of a low photoelasticity constant of the resin, notwithstanding the high viscosity of the molten resin, resulting in that the optical distorsion, i.e., birefringence property of the disk substrate obtained is low.
申请人：HITACHI LTD,HITACHI MAXELL LTD
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