Process for the preparation of substrates for optical disk
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United States of America Patent
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Oct 11, 1994
Issued Date -
N/A
app pub date -
Apr 27, 1993
filing date -
Jun 5, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process for the preparation of substrate for optical disk characterized in that pellets of 4-methyl-1-pentene polymer or copolymer having a melt flow rate (MFR), as measured according to ASTM D1238 under a load of 5 kg and at a temperature of 260.degree. C., of 240-1200 g/10 min, and a melting point as measured by means of DSC of 234.degree.-240.degree. C., are injection molded into the substrate under the conditions where a temperature of at least part of a cylinder is 320.degree.-370.degree. C. and a mold temperature is not more than 55.degree. C.
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