| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method capable of stably manufacturing an amorphous thermoplastic resin sheet reduced in thickness irregularity, having good surface smoothness, excellent in optical characteristics, reduced in phase difference and especially suitable in a production of a resin sheet having an alicyclic structure. <P>SOLUTION: In the method for manufacturing the amorphous thermoplastic resin sheet by successively passing the sheetlike molten thermoplastic resin extruded from an extruder along the peripheries of two drums comprising first and second cooling drums, the expression t×(T<SB>1</SB>-T<SB>g</SB>) is set to -50-+20 s°C when the resin contact time with the first cooling drum is set to t s, the temperature of the resin when separated from the first cooling drum is set to T<SB>1</SB>°C and the glass transition temperature of the resin is set to T<SB>g</SB>°C. <P>COPYRIGHT: (C)2003,JPO</p> |
