ACRYLIC COPOLYMER, OPTICAL FILM, POLARIZING PLATE AND LIQUID CRYSTAL DISPLAY DEVICE
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United States of America Patent
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Issued Date -
Dec 24, 2015
app pub date -
Nov 22, 2013
filing date -
Nov 22, 2012
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Abandoned
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Abstract
There are provided an optical film having both low orientation birefringence and low photoelastic birefringence and, at the same time, having excellent transparency and heat resistance, and a polarizing plate including the optical film and a liquid crystal display device. An acrylic copolymer according to the present invention includes as constituent units 0.5 to 35% by mass of N-aromatic substituted maleimide units and 60 to 85% by mass of alkyl (meth)acrylate units having a negative intrinsic birefringence in terms of a homopolymer.
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