Optical data carriers and method for producing the same

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United States of America Patent

PATENT NO 6855390
SERIAL NO

10111991

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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A process for the preparation of optical data carriers made of a particualr polycarbonate is disclosed. The polycarbonate is prepared by the phase boundary process that entails reacting at least one dihydroxydiarylalkane in the form of its alkali metal salts with phosgene in the heterogeneous phase in the presence of sodium hydroxide solution and an organic solvent. The process is characterized in that the feedstock have but low content of Fe, Cr, Ni, Zn, Ca, Mg, Al metals or homologues thereof, and in that the organic solvent is separated off, and in that the polycarbonate which is obtained is worked up. The resulting polycarbonate is particularly useful in producing optical data carriers.

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Patent Owner(s)

  • BAYER AKTIENGESELLSCHAFT;BAYER ANTWERP N.V.

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Bieringer, Thomas Odenthal, DE 24 146
Bruder, Friedrich-Karl Krefeld, DE 128 1246
Bruynseels, Franky Sint-Gillis-Waas, BE 13 43
de, Cleyn Rene Wuustwezel, BE 7 15
Haese, Wilfried Odenthal, DE 62 251
Kuhling, Steffen Meerbusch, DE 47 417
van, Meirvenne Dirk Chonburi, TH 8 16

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