| 摘要 |
PURPOSE:To obtain a substrate having superior dynamic performance, heat resistance and extremely superior dimensional stability and suitable for use as a substrate for a magnetic or optical disk without adding a filler for rein forcement by melting and molding a thermally liq.-crystalline polymer showing optical anisotropy during melting. CONSTITUTION:The thermally liq.-crystalline polymer made of a copolycondensate consisting of structural units represented by formulae I, II, III, IV, the thermally liq.-crystalline polymer consisting of structural units represented by formulae I, V, VI, or the thermal liq.-crystalline polymer consisting of structural units represented by formulae I, III, VII (where X is 1-5C hydrocarbon, halogen, alkoxy or phenoxy) and formula VIII (where Y is O, S, SO2, CO, alkylene or alkylidene, two rings may bond directly, and each of R1-R8 is H, halogen or hydrocarbon) is melted and molded to obtain a substrate. This substrate has superior rigidity, hardness and surface smoothness without using a reinforcing material such as glass fiber, and it is hardly deformed by a thermal change and is suitable for use as the substrate for an optical or magnetic disk.
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