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US 5,470,937 AGranted
Anisotropically oriented phase difference compensation film of a branched polycarbonate
AssigneeIdemitsu Petrochemical Co., Ltd.
InventorsMasaya Okamoto, Shigeki Kuze, Noriyuki Kunishi, Taisuke Nakashima
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Abstract
A phase difference compensation film formed of a polycarbonate, which can be used in a liquid crystal display and which shows a decreased change in retardation caused by a temperature change at a stretch forming time due to the use of a polycarbonate having a branched structure and having a viscosity-average molecular weight of 40,000 or less as the above polycarbonate.
Claims20
A phase difference compensation film comprising an anisotropic orientation film of a branched polycarbonate having a viscosity-average molecular weight of less than 40,000.
Dependencies are inferred from the claim text.