Optical film comprising birefringent naphthalate copolyester having branched or cyclic C4-C10 alkyl units
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United States of America Patent
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Sep 6, 2011
Grant Date -
Nov 5, 2009
app pub date -
May 2, 2008
filing date -
May 2, 2008
priority date (Note) -
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Abstract
The present invention relates to multilayer optical films and birefringent copolyester films. The birefringent copolyester optical layer or birefringent copolyester film comprises a major amount of naphthalate units, ethylene units, and a minor amount of branched or cyclic C4 to C10 alkyl units. Also described are certain copolyester polymeric materials further comprising subunits of a phthalate ionomer such as dimethyl sulfosodium isophthtalate ionomer.
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