Compositions having low birefringence

Details Compositions having low birefringence Compositions having low birefringence

C - Chemistry, Metallurgy

08

L

C08L 69/00 (2006.01) C08L 67/02 (2006.01) G11B 7/253 (2006.01)

Patent

CA 2171584

A thermoplastic molding composition suitable for the preparation of articles having low birefringence is disclosed. Accordingly, the composition contains polycarbonate and a polyester copolymer based on cyclohexane-dimethanol, ethylene glycol and phthalic acid. The invention resides in the findings that the incorporation of a polycarbonate resin having a melt flow index greater than 18 9/10 minutes impart to the composition low birefringence values. The composition is suitable for the preparation of optical storage media, including compact discs.

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