Phase difference plate comprising polymer film containing compound having rod-shaped molecular structure
First Claim
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1. A phase difference plate comprising a cellulose ester film which comprises a compound represented by the following formula (I):
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Ar1-L1-Ar2
(I)in which each of Ar1 and Ar2 is independently phenyl or phenyl substituted with an alkyl group selected from the group consisting of methyl, ethyl, propyl, butyl, pentyl, heptyl and octyl; and
L1 is —
O—
CO-alkylene-CO—
O—
or —
CO—
O-alkylene-O—
CO—
, said alkylene having a chain structure and having 1 to 6 carbon atoms.
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Abstract
A phase difference plate which comprises one sheet of polymer film containing a compound having a rod-shaped molecular structure and exhibiting a maximum absorption wavelength (λmax) of less than 250 nm in an ultraviolet spectrum of its solution and which exhibits a retardation value as measured at a wavelength of 450 nm (Re450) of 60 to 135 nm and a retardation value as measured at a wavelength of 590 nm (Re590) of 100 to 170 nm, where the relationship: Re590−Re450≧2 nm is satisfied. The phase difference plate functions as a λ/4 plate.
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4 Claims
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1. A phase difference plate comprising a cellulose ester film which comprises a compound represented by the following formula (I):
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Ar1-L1-Ar2
(I)in which each of Ar1 and Ar2 is independently phenyl or phenyl substituted with an alkyl group selected from the group consisting of methyl, ethyl, propyl, butyl, pentyl, heptyl and octyl; and
L1 is —
O—
CO-alkylene-CO—
O—
or —
CO—
O-alkylene-O—
CO—
, said alkylene having a chain structure and having 1 to 6 carbon atoms. - View Dependent Claims (2, 3)
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4. A cellulose ester film comprising a compound represented by the following formula (I):
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Ar1-L1-Ar2
(I)in which each of Ar1 and Ar2 is independently phenyl or phenyl substituted with an alkyl group selected from the group consisting of methyl, ethyl, propyl, butyl, pentyl, heptyl and octyl; and
L1 is —
O—
CO-alkylene-CO—
O—
or —
CO—
O-alkylene-O—
CO—
, said alkylene having a chain structure and having 1 to 6 carbon atoms.
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Specification