Other

Bayer Aktiengesellschaft

Bayer Antwerpen N.v.

Bayer Materialscience Ag

Franky Bruynseels

Friedrich-Karl Bruder

Wolfgang Ebert

Heinz Pudleiner

Alexander Meyer

Dirk Van Meirvenne

Michael B&ouml;diger

Steffen Kühling

René De Cleyn

Ren&eacute; De Cleyn

Klaus Horn

Wilfried Haese

Wolfgang Alewelt

Klaus Meyer

Ralf Hufen

Alexander Karbach

Steffen K&uuml;hling

Thomas Bieringer

Michael Bödiger

Ren&euml; De Cleyn

Peter Gebauer

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.

Optical data carriers and method for producing the same

Polycarbonate substrates, the preparation of which is based on 1,1-bis-(4-hydroxyphenyl) -3,3,5-trimethylcyclohexane, and their use for producing shaped articles with particularly high purity and extremely high surface brilliance and also the shaped articles which can be produced from the polycarbonate substrate are described.

Polycarbonate substrates

A process for the preparation of polycarbonate by the phase boundary process is disclosed. The process 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 transparent shaped articles.

Method of producing polycarbonates

Polycarbonate substrates having low concentration of defects are disclosed. The substrates are suitable for producing molded articles characterized by low cloudiness.

Polycarbonate substrates, the preparation of which is based on 1,1-bis-(4-hydroxyphenyl)-3,3,5-trimethylcyclohexanone, and their use for producing shaped articles with particularly high purity and extremely high surface brilliance and also the shaped articles which can be produced from the polycarbonate substrate are described.

A branched polycarbonate resin suitable for making containers is disclosed. The polycarbonate is characterized in that at 260&deg; C. and shear rate of 10 s it has a melt viscosity of 5500 to 900 Pas, and in that at 260&deg; C. and shear rate of 1000 s it has a melt viscosity of 880 tom 1500 Pas, and in that it has a melt flow index (MFR) of 0.1 to 3.0 g/10 min. A container made of the polycarbonate exhibits great breaking strength.

Containers made of a branched polycarbonate

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Sint-Gillis-Waas, Belgium

Franky Bruynseels