OPTICAL FILM AND LIQUID CRYSTAL DISPLAY DEVICE COMPRISING THE OPTICAL FILM
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United States of America Patent
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Issued Date -
Oct 2, 2014
app pub date -
Sep 25, 2012
filing date -
Oct 4, 2011
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Abstract
Disclosed is an optical film produced by a method comprising continuously discharging a molten resin on a casting roll through a die lip of an extruder, wherein the molten resin contains a copolymer of (A) 75 to 99% by weight of an (meth)acrylate monomer that, when homopolymerized, has a negative intrinsic birefringence, and (B) 1 to 25% by weight of an (meth)acrylate monomer that, when homopolymerized, has a positive intrinsic birefringence, and a velocity ratio V2/V1 of 1.2 to 15 is satisfied wherein V1 represents a discharge velocity of the molten resin from the die lip, m/min; and V2 represents a surface velocity of the casting roll, m/min.
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