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

B - Operations, Transporting

29

D

B29D 17/00 (2006.01) B29C 45/00 (2006.01) B29C 45/26 (2006.01)

Patent

CA 2070444

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°C, of 240-1200 g/10 min, and a melting point as measured by means of DSC of 234-240°C, are injection molded into the substrate under the conditions where a temperature of at least part of a cylinder is 320-370°C and a mold temperature is not more than 55°C.

Cette invention se rapporte à un procédé de fabrication de substrats de disques optiques qui consiste à mouler par injection des granules de polymère ou de copolymère de type 4-méthyl-1-pentène ayant un indice de fluage (mesuré selon ASTM D1238, avec une charge de 5 kg, à une température de 260 degrés C) compris entre 240 et 1200 g/10 min., et un point de fusion (déterminé par la méthode DSC) compris entre 234 et 240 degrés Celsius, dans des conditions telles que la température d'au moins une partie du cylindre est comprise entre 320 et 370 degrés Celsius et que la température du moule est d'au plus 55 degrés Celsius.

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