Article for optical data storage device
AssigneeGeneral Electric Company
InventorsRobert R. Gallucci, Frank A. Hoefflin, Steven F. Hubbard, Ramesh Hariharan, Irene Dris
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Abstract
Disclosed is an article for the optical storage of data having low birefringence prepared from a mixture of a polycarbonate and a cycloaliphatic polyester. The article may optionally have stabilization and mold release additives that retain transparency, color and processability.
Claims24
An article for optical storage of information comprising a blend of a cycloaliphatic polyester comprising a cycloaliphatic diacid and cycloaliphatic diol units and a polycarbonate with in plane birefringence from −100 to +100 nm wherein the ratio of polyester to polycarbonate is in the range of 40:60 to about 5:95 % by weight of the entire mixture.
An article for optical storage of information comprising a blend of a cycloaliphatic polyester and a polycarbonate wherein said polycarbonate comprises a spiro biindane bisphenol.
A process for reading stored information on a disc of the type having at least one optical quality layer comprising transmitting a signal to said optical quality layer to read said stored information, said storing means being operably associated with said optical quality layer, said optical quality layer comprising a blend of a cycloaliphatic polyester comprising a cycloaliphatic diacid and cycloaliphatic diol units and polycarbonate with in plane birefringence from −100 to +100 nm.
Dependencies are inferred from the claim text.