Process for the preparation of substrates for optical disk

Details Process for the preparation of substrates for optical disk Process for the preparation of substrates for optical disk

1993-04-27

1994-10-11

Heitbrink, Jill L.

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

26432816, B29C 4573

Patent

active

053545176

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.

REFERENCES:
patent: 4921205 (1990-05-01), Drew, Jr. et al.
patent: 5154958 (1992-10-01), Namba et al.

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